CN102163828B - Intelligent prevention and control system and method for continuously supplying power in power transmission network ice disaster - Google Patents

Intelligent prevention and control system and method for continuously supplying power in power transmission network ice disaster Download PDF

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CN102163828B
CN102163828B CN 201110060883 CN201110060883A CN102163828B CN 102163828 B CN102163828 B CN 102163828B CN 201110060883 CN201110060883 CN 201110060883 CN 201110060883 A CN201110060883 A CN 201110060883A CN 102163828 B CN102163828 B CN 102163828B
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submodule
output
power
upstream
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CN102163828A (en
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张秀彬
曼苏乐
黄军剑
朱磊
胡志勇
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North Jiangsu Institute Of Shanghai Jiaotong University
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Abstract

The invention provides an intelligent prevention and control system and method for continuously supplying power in a power transmission network ice disaster. The system comprises an image sensor, a signal processor, a system controller, an upstream high-voltage switch cabinet, a power reduction transformer, a remote signal sending module, a power transformation device of power electronics, a power transmission network, an upstream high frequency choke group, an upstream high-voltage capacitor group, a downstream high frequency choke group, a remote signal receiving module, a downstream high-voltage switch cabinet, a downstream high-voltage capacitor group and a current sensor. According to the invention, three-phase wires can be ensured to generate the optimum amplitude of electronic mechanical vibration at the same time that the three-phase wires are subjected to high-frequency large-current heat fusion, thus accelerating the fusion and drop of ices on wire surfaces under the joint action of the optimum high frequency large-power current, optimum mechanical vibration frequency and optimum amplitude, thereby being capable of shortening the time to eliminate the ices, and reaching the effect of saving energy of the heat fusion.

Description

The power supply of power transmission network ice slush disaster is Intelligent preventive control System and method for intermittently not
Technical field
What the present invention relates to is a kind of Intelligent preventive control System and method for of Power System and its Automation technical field, specifically a kind of power supply of power transmission network ice slush disaster Intelligent preventive control System and method for intermittently not.
Background technology
The ice and snow disaster of meeting in 2008 50 years one is come clearly into view so far on the impact of electric power system.The a plurality of provinces of south China power transmission network occurred successively and fell the accidents such as tower, broken string at that time, had caused the large-area power-cuts of electrical network, and situation is unprecedented.Electrical network is so fragile, and this when formulating the software and hardware of national south electric network construction criteria and electric power transmission ﹠ distribution mode, pays attention to its high-efficiency and economic with China more, and it is relevant to ignore the safe weatherability that strengthens electrical network facilities itself; Also manifest simultaneously, people grasp importance and the urgency of prevention and control power transmission network ice slush disaster effective technology as early as possible.
When the Winter-Spring crossed in 2010 and 2011, in Yunnan, serious power transmission network ice slush phenomenon appears in the southern province such as Guizhou, Jiangxi again.Although these regional power transmission networks are through the large tracts of land that does not occur winter in 2008 after transformations of the first two years phenomenon of collapsing, the deicing task on the power transmission line is still very arduous.Know for fear of the power transmission network large tracts of land disaster of collapsing again occurring from media reports such as newpapers and periodicals, the power department worker of this area has to rely on a large amount of labours that power transmission line is implemented artificial deicing, and be to adopt method very rudimentary, that fall behind, after allowing grid " operate a switch " to have a power failure, adopt club to beat to allow the ice slush that condenses on the power transmission line fall down, in addition, almost not without very wise move.Its labour intensity is big, deicing efficiency low, well imagine.
In the existing power grid construction standard of China, the tower bar bearing capacity that adopts is electrical network wire weight and pulling force about five times, this is enough in normal electric power transmission ﹠ distribution process, but, when a plurality of provinces were attacked by the especially big disaster of sleet ice slush in south, the attached ice weight of some regional wire will be uprushed five, 60 times overnight.So to fall the super appearance of carrying of bearing a heavy burden also be unaffordable to original firmer tower bar in the sky, and tower must occur down its consequence, break bar, broken string, and even collapses completely, collapses as " Domino effect ".Come tension to exceed original tens times stress by improving the power transmission line standard, its Financial cost is that national grid institute is burdensome, let alone the high-efficiency and economic problem of transmission system.
Can say, in the power grid construction process, how to prevent and treat the ice slush disaster problem, be still so far the common major issue of being concerned about in the whole nation from the leadership to the masses, because, even power grid construction hardware facility standard is improved, as the electrical network wire is increased slightly, the tower bar strengthens, if but do not find effective technical method from prosecution with preventing and treating, in the more Large Scale Natural Disasters front that may occur future, still there is unknown number in power grid security.
With regard to existing technology, power transmission network deicing technology commonly used is divided into substantially mechanical deicing, heating power deicing and electric wire coating hydrophobic and hates ice material three types of technology.
The first kind, mechanical deicing's technology:
Find by prior art documents, " Ice storm management on an electrical utility system " (Proceedings of th7th IWAIS of JamesW.Hall, Canada, 1996,225-230) introduce the method that adopts crane, insulation power tool car and charged direct operation mode mechanical deicing, also introduced simultaneously the typical machine de-icing method of manual deicing or helicopter deicing etc.This de-icing method power consumption is little, cheap, but operating difficulties is both dangerous, and very ineffective again, security performance also can't be protected.
Find by prior art documents again, " Modeling of the Ice Accretion on Wires " (Journal of Climate and Applied Meteorology of Mulherin, Donaldson, 1998, Vol.23) introduce that a kind of operating personnel spur the pulley that can walk on the line and reach the method for rooting out icing on the wire by ground.This is a kind of at present unique mechanical means that obtains the removing ice of power transmission line of practical application, but still needs to rely on heavy human resources.
Equations of The Second Kind, heating power deicing technology:
Find by prior art documents, Davidson C.C., Horwill C, " APower-Electronics Based Transmission Line Deicing System " (AC and DC Power Transmission of Granger M. and Dery A, 2006.ACDC 2006.The 8th IEE International Conference on 28-31 March 2006 Page (s): 135-139) introduced the actual conditions of utilizing line reactance and resistance ratio very large, proposed a kind ofly will want the deicing circuit and break away from the de-icing method that electrical network passes to high voltage direct current again.
The method is when ice slush being arranged when electric wire accumulates, and by freezing inductor early warning, Utilities Electric Co. temporarily isolates electrical network with freezing circuit.Utilize high-voltage power electronic device with this section line short to form the loop, the direct current (size of current is determined by circuit types) that reinjects this moment, circuit is because of the Joule effect deicing of generating heat.Consider that annual circuit is a bit of time to need deicing, high-voltage power electronic device is incorporated into the power networks can be used as under normal circumstances reactive-load compensator at ordinary times, has so both increased the economic benefit of its system, has ensured again the all-weather safety reliability of circuit.
Find by prior art documents again, " On-Load Network De-Icer Specification for a Large Transmission Network " (IEEETransactions on Power Delivery of Ren é Cloutier, Andr é Bergeron and Jacques Brochu, Vol.22, No.3, July 2007.pp.1947-1955) introducing a kind of band for the large electrical network of high pressure carries the deicing scheme.The method need not open-circuit line, only need utilize phase shifting transformer that the voltage-phase on the circuit is changed so that the trend distribution on the two-way ultra-high-tension power transmission line changes, thereby so that wherein the electric current on circuit increases, temperature raises, and then reach the deicing purpose.
But " Joule effect causes the heating deicing " method that these single dependence direct currents or change trend are distributed is longer action time, and the electric energy that consumes is huge, so that the deicing cost is higher.
The 3rd class, electric wire apply hydrophobic and hate the ice material technology:
Find that by prior art documents Wang Jin, Yang Baojie, what introduce by " measure of coated by ice of overhead power transmission line harm and anti-icing and deicing " (science and technology summary, the 7th phase in 2008) of society is to be coated with hydrophobic at wire table bread to hate ice property material.Require this material adhesion preferably and higher thermal transmission coefficient to be arranged with metallic matrix, also to have the low surface tension coefficient and high hydrophobic is hated ice, therefore, can reduce to greatest extent water and ice to the adhesive force of conductive line surfaces, very easily water or ice are come off from its surface, prevent the effect of condensing ice slush thereby reach.
But the method certainly will increase the construction cost of whole electrical network, and along with the prolongation of service time, the aging effect that loses original " hydrophobic is hated ice " be full of cracks can appear in the power transmission line coating material of existing technique unavoidably.
To the electric power distributing systems in overwhelming majority zone under the prerequisite that does not change original technical standard, the ability of its freeze proof rain of Effective Raise, accumulated snow, ice slush disaster the technology of the present invention Key technique problem to be solved just how.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, the power supply that a kind of power transmission network ice slush disaster is provided is Intelligent preventive control System and method for intermittently not, the efficiently generation of prevention and control power transmission line ice slush disaster (following will " eliminate the power transmission network ice slush ", " elimination ice slush " referred to as " deicing ").
The present invention is achieved by the following technical solutions:
The power supply of power transmission network ice slush disaster involved in the present invention is Intelligent preventive control system intermittently not, comprising: imageing sensor, signal processor, system controller, upstream high-tension switch cabinet, electric power step-down transformer, remote signal sending module, power electronics transformation device, power transmission network, upstream high frequency choke device group, upstream high-voltage capacitor group, downstream high frequency choke device group, remote control signal receiving module, downstream high-tension switch cabinet, downstream high-voltage capacitor group, current sensor.Wherein, the output interface of imageing sensor is connected with the input interface of signal processor; The output interface of signal processor is connected with the digital input interface of system controller and remote signal sending module; The output interface of system controller is connected with the control signal input interface of upstream high-tension switch cabinet; Three input terminations, contact of first group of normal open switch in the high-tension switch cabinet of upstream are connected with power transmission network upstream three-phase end points, and three output contact terminations of first group of normal open switch in the high-tension switch cabinet of upstream are connected with the former limit three-phase input end point of electric power step-down transformer; The secondary three-phase output end point of electric power step-down transformer and neutral point are connected with the power input interface of power electronics transformation device, the current detection signal input interface of power electronics transformation device is connected with the output interface of current sensor, current sensor is arranged in any one loop of power electronics transformation device, the neutral ground of electric power step-down transformer: three high potential exit points of power electronics transformation device output interface are connected with three input terminations, contact of the 3rd group of normal open switch in the high-tension switch cabinet of upstream, and three electronegative potential exit points of power electronics transformation device output interface altogether; Three input terminations of three high-voltage capacitors in the high-tension switch cabinet of upstream in three output contact terminations of the 3rd group of normal open switch and the upstream high-voltage capacitor group are connected; Three of three high-voltage capacitors in the high-voltage capacitor group of upstream output terminations respectively with upstream high frequency choke device group in the corresponding connection in three terminations, three high frequency choke inductor rear ends; Three pairs of terminations of three high frequency choke inductor front and back ends in the high frequency choke device group of upstream respectively corresponding with input, the three pairs of terminations of output of second group of normally closed switch in the high-tension switch cabinet of upstream and connect after, be serially connected with respectively again in the three-phase corresponding line of power transmission network upstream; The remote signal sending module is by the reception antenna transmission remote signal of transmitting antenna to remote control signal receiving module; The output interface of remote control signal receiving module is connected with the input interface of downstream high-tension switch cabinet; Three pairs of terminations of three high frequency choke inductor front and back ends in the input of first group of normally closed switch in the high-tension switch cabinet of downstream, the three pairs of terminations of output and the downstream high frequency choke device group and connect after, be serially connected with again in the three-phase corresponding line in power transmission network downstream; Three of three high-voltage capacitors in the high-voltage capacitor group of downstream input terminations respectively with downstream high frequency choke device group in the corresponding connection in three terminations of three high frequency choke inductor front ends, export the termination common grounds for three of three high-voltage capacitors in the high-voltage capacitor group of downstream.
Described " high frequency " is relative 50Hz ac frequency, such as frequency 40kHz.Strictly speaking, applicable frequency is that the equipments and devices of 40kHz signal should be called as " superaudio " equipments and devices, the present invention claims to be higher than the equipment, device, electric parameter of 50Hz ac frequency etc. and is high-frequency apparatus, device, parameter, such as high frequency choke device, high-voltage capacitor, high frequency deicing electric current etc.
Described imageing sensor, namely video camera (or claiming camera) is implemented the collection to scene image.With regard to solid state image sensor, the current three major types type that mainly contains: ccd image sensor (Charge Coupled Device is called for short CCD) claims again charge-coupled image sensor; Cmos image sensor (Complementary Metal-Oxide Semiconductor is called for short CMOS) claims again SSPD (Self Scanned Photodiode Array is called for short SSPA); CID charge injection device (Charge Injection Device is called for short CID).The three all is photosensitive semiconductor device, namely utilizes the sensitization dipole semiconductor to carry out the conversion of light and electricity.Select ccd image sensor comparatively suitable when being used for the state recognition of power transmission network ice slush with monitoring, its high image resolution will be determined according to the distance of imageing sensor installation site and detected power transmission line.The output interface of imageing sensor is connected with the image signal input interface of signal processor by vision cable.Imageing sensor is used for gathering the power transmission network image information, is to catch in real time the machine vision sensing device whether power transmission network exists ice slush, and its output interface is connected with the input interface of signal processor.
Described signal processor comprises: image signal input interface, analog-to-digital conversion module, computing decision-making module, control command output interface.Wherein: the input port of image signal input interface is connected with the imageing sensor output interface, the output port of image signal input interface is connected with the input port of analog-to-digital conversion module, and the output port of analog-to-digital conversion module is connected with the input port of computing decision-making module; The output port of computing decision-making module is connected with the input port of control command output interface, and the output port of control command output interface is connected with the digital input interface of system controller and remote signal sending module.After signal processor is processed received picture signal, whether occur on the power transmission line or exist ice slush to make accurate judgement, export the computing of signal processor and the control command of result of determination to system controller and remote signal sending module.
Described system controller comprises: digital input interface, D/A converter module, drive amplification module, analog signal output interface.Wherein, the output port of digital input interface is connected with the input port of D/A converter module, and the output port of D/A converter module is connected with the input port of drive amplification module; The output port of drive amplification module is connected with the input port of analog signal output interface, and the output port of analog signal output interface is the output interface of system controller.The output interface of system controller is connected with the input interface of upstream high-tension switch cabinet, received control command is converted to analog signal to system controller and process is amplified rear drive upstream high-tension switch cabinet, start its high-voltage switch gear device action, and then make system of the present invention enter the de-icing work state.
Described upstream high-tension switch cabinet comprises three groups of high-voltage switch gear devices.First group is high pressure normal open switch device, be called for short the first group of normal open switch in upstream, the three-phase input termination, contact of the first group of normal open switch in upstream is connected with power transmission network upstream three-phase end points, and the three-phase output contact termination of the first group of normal open switch in upstream is connected with the former limit of electric power step-down transformer three-phase input end head.Second group is high pressure normally closed switch device, be called for short the second group of normally closed switch in upstream, the three-phase of the second group of normally closed switch in upstream input termination, contact is corresponding with three high frequency choke inductors, one side head in the high frequency choke device group of upstream and connect respectively, the three-phase output contact termination of the second group of normally closed switch in upstream is corresponding with the opposite side termination of three high frequency choke inductors in the high frequency choke device group of upstream and connect respectively, both and connect after, three high frequency choke inductors are serially connected with respectively in the three phase line of power transmission network upstream again, and claim that second group of normally closed switch input termination, contact of high frequency choke inductor and upstream and a side that connects are upstream high frequency choke inductor front end, be called for short upstream choke front end, claim that high frequency choke inductor and second group of normally closed switch output contact termination, upstream and a side that connects are high frequency choke inductor rear end, upstream, be called for short choke rear end, upstream.The 3rd group is high pressure normal open switch device, be called for short the 3rd group of normal open switch in upstream, the three-phase of the 3rd group of normal open switch in upstream input termination, contact is connected with the three-phase output end head of power electronics transformation device respectively, the three-phase output contact termination of the 3rd group of normal open switch in upstream respectively with upstream high-voltage capacitor group in the corresponding connection of three-phase input end head of three high-voltage capacitors; The three-phase output end head of three high-voltage capacitors in the high-voltage capacitor group of upstream respectively with upstream high frequency choke bank of inductors in the corresponding connection in high frequency choke inductor rear end, three upstreams.When signal processor control command startup system control device, and then when driving derailing switch action in the high-voltage board of upstream, the first group of normal open switch in upstream is closed, and the former limit of electric power step-down transformer and power transmission network upstream three are connected; The second group of normally closed switch in upstream is opened, so that be in the state that is connected in series respectively in the three phase transmission line upstream with itself and three high frequency choke inductors connecing, play the effect of controlling to high-frequency current, therefore can stop the high-frequency current of power electronics transformation device output to " feedback flows backwards " of power transmission network upstream; The 3rd group of normal open switch in upstream is closed, three high-voltage capacitors in the high-voltage capacitor group of upstream respectively corresponding three-phase (three tunnel) high-frequency current output with the power electronics transformation device are connected, by the high capacitive reactance characteristic of capacitor to low-frequency current, can stop the 50Hz High Level AC Voltage to power electronics transformation device output interface " rushing short circuit ".That is to say that the connected mode of power transmission network upstream high frequency choke device group and upstream high-voltage capacitor group can guarantee in the course of work of the present invention that high-frequency alternating current and 50Hz High Level AC Voltage are in " in order " shunting of power transmission network upstream.When the input interface of upstream high-tension switch cabinet when system controller receives " interruption " signal of signal processor output, three groups of high-voltage switch gear devices in the high-tension switch cabinet of upstream return to normal, be original often opening or normally off, so that the former limit three-phase input end point of electric power step-down transformer is not access in three-phase high-voltage, simultaneously, three high frequency choke inductors in the high frequency choke device group of upstream are in " short circuit " state, be that the power transmission network upstream is not connected in series by three high frequency choke inductors in the high frequency choke device group of upstream, be in off-state between the three-phase output end point of upstream high-voltage capacitor group and power electronics transformation device, power transmission network is not by high-frequency current " injection ".
Described electric power step-down transformer, former limit are that the three-phase triangle connects, and namely are input as three-phase three-wire system; Secondary is the three-phase Y-connection, namely is output as three-phase four-wire system.The secondary three-phase output end point of electric power step-down transformer and neutral point are connected with the power input interface of power electronics transformation device; The secondary output voltage is 500~2000V, former/the secondary coil turn ratio needs determine according to input voltage, such as input, when output voltage is respectively 220kV and 1000V, single-phase former/the secondary coil turn ratio is 220: 1.Actual output voltage, electric current and the frequency thereof of electric power step-down transformer secondary is subjected to the adjusting of power electronics transformation device.
Described power electronics transformation device comprises: power input interface, the first commutator module, the second commutator module, the 3rd commutator module, the first filtering submodule, the second filtering submodule, the 3rd filtering submodule, the first electronic power switch major loop submodule, the second electronic power switch major loop submodule, the 3rd electronic power switch major loop submodule, Switching Power Supply control module.The three-phase input end head of power input interface is connected with the secondary three-phase output end point that the three-phase four-wire system of electric power step-down transformer is exported respectively, and the ground wire termination of power input interface is connected with the secondary neutral point of electric power step-down transformer; Three tunnel output terminations of power input interface are connected with the input termination of the first commutator module, the second commutator module, the 3rd commutator module respectively; The output termination of the first commutator module, the second commutator module, the 3rd commutator module is connected with the input termination of the first filtering submodule, the second filtering submodule, the 3rd filtering submodule respectively; The output termination of the first filtering submodule, the second filtering submodule, the 3rd filtering submodule is connected with the power input end head of the first electronic power switch major loop submodule, the second electronic power switch major loop submodule, the 3rd electronic power switch major loop submodule respectively; The output termination of the first electronic power switch major loop submodule, the second electronic power switch major loop submodule, the 3rd electronic power switch major loop submodule is inputted the termination, contact with the three-phase of the 3rd group of normal open switch in upstream respectively and is connected respectively; The control signal input termination of the first electronic power switch major loop submodule, the second electronic power switch major loop submodule, the 3rd electronic power switch major loop submodule is connected with the output port of Switching Power Supply control module respectively; The current detection signal input port of Switching Power Supply control module is connected with the output interface of current sensor; The voltage detection signal input port of Switching Power Supply control module is connected with any one voltage feedback signal output interface of first, second and third electronic power switch major loop submodule.
Described first, second and third commutator module, rectification circuit wherein adopt power diode to consist of the bridge rectifier topological structure.Power diode belongs to large power semiconductor device, and now the maximum rated voltage of power diode, electric current can reach respectively 6kV and more than the 6kA.Described first, second and third filtering submodule, the Γ type topological structure that filter circuit wherein is made of inductance and electric capacity, filter circuit are that the electric current after the rectification is removed ripple, play level and smooth effect.
Described first, second and third electronic power switch major loop submodule adopts power electronic device (as: turn-off thyristor GTO, power field effect transistor MOSFET, insulated gate bipolar transistor IGBT etc.) to consist of the bridge type inverse topological structure.Wherein, the capacity level of insulated gate bipolar transistor IGBT can reach (1200~1600A)/(1800~3330V), operating frequency reaches more than the 40kHz.When needs strengthen electric current output, can realize by the parallel connection of power electronic device; When needs improve the voltage ability to bear of power electronic device, can realize by the series connection of power electronic device.
Described Switching Power Supply control module comprises: high-frequency current detection signal input interface, high-frequency current filtering submodule, high-frequency current amplify submodule, high frequency voltage detection signal input interface, SPWM generation submodule, SPWM signal driver submodule, the first driver output interface, the second driver output interface, phase shifting control submodule.Wherein, the input port of high-frequency current detection signal input interface is connected with the output interface of current sensor; The output port of high-frequency current detection signal input interface is connected with the input port of high-frequency current filtering submodule; The output port of high-frequency current filtering submodule is connected with the input port that high-frequency current amplifies submodule; The output port that high-frequency current amplifies submodule is connected with the current signal input port that the submodule input interface occurs SPWM; The input port of high frequency voltage detection signal input interface is connected with any one voltage feedback signal output interface of first, second and third electronic power switch major loop submodule, and the output port of high frequency voltage detection signal input interface is connected with the high frequency voltage feedback signal input port that submodule occurs SPWM; The output port that submodule occurs SPWM is connected with the input port of SPWM signal driver submodule; The input port of the output port of SPWM signal driver submodule and the first driver output interface, the second driver output interface also connects; The output port of the first driver output interface is connected with the control signal input port of the first electronic power switch major loop submodule; The output port of the second driver output interface is connected with the SPWM signal input port of phase shifting control submodule; First, second output port of phase shifting control submodule is connected with the control signal input termination of the second electronic power switch major loop submodule, the 3rd electronic power switch major loop submodule respectively.All submodules in the power electronics transformation device and are connected with electric power step-down transformer secondary neutral point altogether.
Submodule occurs in described SPWM, comprising: input interface, current setting value device, signal comparator, sinusoidal signal generator, adder, saw-toothed wave generator, signal modulator, output port.The current signal input port that the submodule input interface occurs SPWM is connected with the output port that high-frequency current amplifies submodule, and the high frequency voltage feedback signal input port that the submodule input interface occurs SPWM is connected with the output port of high frequency voltage detection signal input interface; The output port that the submodule input interface occurs SPWM is connected with the comparison signal input port of signal comparator, the setting signal input port of signal comparator is connected with the output port of current setting value device, the output port of signal comparator is connected with the difference signal input port of adder, the sinusoidal signal input port of adder is connected with the output port of sinusoidal signal generator, the output port of adder is connected with the sinusoidal signal input port of signal modulator, the sawtooth signal input port of signal modulator is connected with the output port of saw-toothed wave generator, and the output port of signal modulator is connected with the input port of SPWM signal driver submodule output interface.The waveform that submodule output occurs SPWM is called as pulse-width modulation waveform, is called for short the SPWM control wave.The pulse width modulation frequency changing circuit is called for short again the SPWM frequency changer circuit, often adopts the form of voltage-source type ac-dc-ac inverter circuit.Its basic principle is size and the frequency of the turn-on and turn-off time of control frequency changer circuit switch element controlling alternating voltage than (being " duty ratio " of regulating impulse width).Because the area under each SPWM square-wave voltage is close to the area under the corresponding sine voltage, again because its pulse duration changes close to sinusoidal rule, so be called again the sinusoidal pulse width modulation waveform.According to sampled-data control theory, pulse frequency is higher, and the SPWM waveform is more close to sine wave.When the output voltage of frequency changer circuit was the SPWM waveform, its low-order harmonic can access good inhibition and elimination, and high order harmonic component is easy to again elimination, thereby can obtain the extremely low sinewave output voltage of aberration rate.By regulating the duty ratio of SPWM signal in the power electronics transformation device, can change the equivalent voltage of power electronics transformation device output, and then change the high-frequency heating size of current that the power electronics transformation device outputs to power transmission network deicing section.By changing the frequency of SPWM signal in the power electronics transformation device, can also change the height that the power electronics transformation device outputs to the high-frequency heating power frequency of power transmission network deicing section.
Described phase shifting control submodule comprises: SPWM signal input port, clock frequency generator, time schedule controller, the first phase-shift circuit, the second phase-shift circuit, the first output port, the second output port.The input termination of SPWM signal input port is connected with the second driver output interface of Switching Power Supply control module, and the SPWM signal input port of the output termination of SPWM signal input port and the first phase-shift circuit, the second phase-shift circuit also connects; The output port of clock frequency generator is connected with the input port of time schedule controller; The output port of time schedule controller comprises G a, G b, G c, G dFour terminations, the corresponding clock signal output in each termination; G a, G bBe connected with first and second triggering control inputs termination of the first phase-shift circuit respectively; G c, G dBe connected with first, second triggering control inputs termination of the second phase-shift circuit respectively; The output port of the first phase-shift circuit, the second phase-shift circuit is connected with the control signal input termination of second, third electronic power switch major loop submodule respectively.The first phase-shift circuit, the second phase-shift circuit structure are identical, consist of by two groups of electronic switches, and every group of electronic switch consists of by two bidirectional thyristors and a phase inverter, and each bidirectional thyristor comprises two main electrode T 1(being the SPWM signal input port of phase-shift circuit), T 2With control utmost point G (namely triggering the control inputs termination).Wherein, the main electrode T of two bidirectional thyristors of first of the first phase-shift circuit group of electronic switch 1And after connecing and the G of time schedule controller aThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Be connected with the first termination of the control signal input port of the second electronic power switch major loop submodule with the output termination of phase inverter and after connecing; The main electrode T of two bidirectional thyristors of second group of electronic switch of the first phase-shift circuit 1And after connecing and the G of time schedule controller bThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Inputting the termination with second of the control signal input port of the second electronic power switch major loop submodule with the output termination of phase inverter and after connecing is connected; The main electrode T of two bidirectional thyristors of first group of electronic switch of the second phase-shift circuit 1And after connecing and the G of time schedule controller cThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Be connected with the first termination of the control signal input port of the 3rd electronic power switch major loop submodule with the output termination of phase inverter and after connecing; The main electrode T of two bidirectional thyristors of second group of electronic switch of the second phase-shift circuit 1And after connecing and the G of time schedule controller dThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Inputting the termination with second of the control signal input port of the 3rd electronic power switch major loop submodule with the output termination of phase inverter and after connecing is connected.
Occur at SPWM under the acting in conjunction of submodule and phase shifting control submodule, so that the high-frequency current generation electricity that exports on the three-phase deicing circuit causes machinery concussion effect, be SPWM occur submodule to the waveform of the control utmost point output of the first electronic power switch major loop submodule with its through two phase-shift circuit phase shifts after phase place between formed two kinds of waveforms form a kind of periodicity, well-regulated variation, therefore meeting so that the high frequency voltage that three electronic power switch major loop submodules are exported have and three kinds of phase relations that the SPWM waveform phase is corresponding.The high frequency voltage of all exporting with the first electronic power switch major loop submodule such as: the high frequency voltage of second and third electronic power switch major loop submodule output is anti-phase etc.In power transmission line equal characteristic impedance situation, still keeping the mutual phase relation of three to three road high frequency voltages of deicing circuit output formed electric current on circuit separately respectively.Because phase relation or homophase or anti-phase between three road electric currents, certainly will cause that three-phase conducting wire in the power transmission network is under the effect of electromagnetic field, produce each other the active force attract each other or repel, any power transmission line in the synthesis result of two kinds of electric field forces so that three-phase conducting wire produces well-regulated concussion each other.The suitable sequencing control level signal of time schedule controller output in the phase shifting control submodule just can be guaranteed to produce between the three-phase conducting wire suitable machinery concussion frequency and impel the ice slush on the wire to accelerate to come off.Regulate suitable SPWM waveform frequency and duty ratio when submodule occurs SPWM, can make No. three electronic power switch major loop submodules treat each other the deicing wire to three and export optimum high-frequency high-power electric current, can guarantee that therefore three-phase conducting wire is being subject to producing the best amplitude that electricity causes the machinery concussion when the large electrical current heat of high frequency melts.Under the acting in conjunction of optimum high-frequency high-power electric current, suitable machinery concussion frequency and three key elements of best amplitude, accelerate the thawing of conductive line surfaces ice slush and come off, therefore can shorten the time of deicing, reach and save the effect that heat is melted power consumption.
Described time schedule controller, its function are the duration by the high and low level of the calculating of clock frequency being determined its corresponding output termination output waveform, i.e. transformation period/frequency.The waveform of time schedule controller output is called as timing control signal or sequence switch signal.
Described upstream high frequency choke device group, comprise three inductors, two end points of each inductor are corresponding with second group of high pressure normally closed switch device in the high-tension switch cabinet of upstream and connect respectively, when upstream high-tension switch cabinet receiving system controller drives signal and starts or when cutting out the high-voltage switch gear action, along with disconnection or the closure of second group of high pressure normally closed switch device contact, determined that three inductors of upstream high frequency choke device group are in serial connection or short circuit state in the transmission line of power transmission network upstream.When three inductors of upstream high frequency choke device group were connected in series respectively into three phase transmission line, the different induction reactance values that the different frequency alternating current presented by this inductor can realize " controlling " of high frequency deicing electric current and to Low ESR " through-flow " effect of 50Hz low-frequency current.
Described upstream high-voltage capacitor group comprises three high-voltage capacitors.The output termination of each high-voltage capacitor is corresponding with three end points in high frequency choke inductor rear end, upstream and connect respectively; The input termination of each high-voltage capacitor is connected with the secondary three-phase output end point of power electronics transformation device respectively.When upstream high-tension switch cabinet receiving system controller drives signal and starts or when cutting out the high-voltage switch gear action, along with the closed or disconnection of the 3rd group of high pressure normal open switch device contact, determined the state that is switched on or switched off of upstream each high-voltage capacitor of high-voltage capacitor group and power electronics transformation device output interface.When the 3rd group of high pressure normal open switch device of the upstream high-tension switch cabinet closing of contact, the high frequency deicing electric current that shows power electronics transformation device output interface output can utilize the low capacitive reactance of high-voltage capacitor to enter smoothly power transmission network, and 50Hz high pressure low-frequency current is received stopping of the high capacitive reactance of high-voltage capacitor and can " fall punching " not enter power electronics transformation device output interface.
Described remote signal sending module comprises: digital signal input interface, carrier wave generation submodule, modulation submodule, power amplification submodule, transmitting antenna.The input port of digital signal input interface is connected with the control command output interface of signal processor; The output port of digital signal input interface is connected with the first input end mouth of modulation submodule, and the output port of carrier wave generation submodule is connected with the second input port of modulation submodule; The output port of modulation submodule is connected with the input port of power amplification submodule; The output port of power amplification submodule is connected with the input port of transmitting antenna.When the digital signal input interface receives the digital command of exporting from signal processor, by the modulation submodule carrier signal is carried out Digital Modulation, high-frequency signal after the modulation is delivered to transmitting antenna and is outwards launched Digital Modulation control command signal after carrying out power amplification through the power amplification submodule.After in a single day remote control signal receiving module receives the Digital Modulation control command signal that the remote signal sending module launches, can implement control to the switch contact in power transmission network downstream according to the control law that instruction is arranged.
Described remote control signal receiving module comprises: reception antenna, demodulation submodule, digital-to-analogue conversion submodule, power amplification submodule, output interface.The output port of reception antenna is connected with the input port of demodulation submodule, and the output port of demodulation submodule is connected with the input port of digital-to-analogue conversion submodule, and the output port of digital-to-analogue conversion submodule is connected with the input port of power amplification submodule; The output port of power amplification submodule is connected with the input port of output interface; The output port of remote control signal receiving module output interface is connected with the input interface of downstream high-tension switch cabinet.
Described power transmission network is the general designation to grid, low-voltage network and user network.Described power transmission network upstream, for deicing track section in the power transmission network, be referred to as the power transmission network upstream at enforcement deicing track section near power transmission network upstream transformer station (institute) side, be called for short " upstream ", be referred to as the power transmission network downstream near power transmission network downstream transformer station (institute) side, be called for short in " downstream ".Three-phase transmission line in the power transmission network represents with U, V, W that respectively the center line in the user network represents with O.Implement the deicing circuit at power transmission network, except continuing to be referred to as to be referred to as respectively first, second and third line conductor U, V, the W phase circuit.
Described downstream high-tension switch cabinet comprises two groups of high-voltage switch gear devices.First group is high pressure normally closed switch device, be called for short the first group of normally closed switch in downstream, the three-phase of the first group of normally closed switch in downstream input termination, contact is corresponding with three high frequency choke inductors, one side head in the high frequency choke device group of downstream and connect respectively, the three-phase output contact termination of the first group of normally closed switch in downstream is corresponding with the opposite side termination of three high frequency choke inductors in the high frequency choke device group of downstream and connect respectively, both and connect after, three high frequency choke inductors are serially connected with respectively in the three phase line of power transmission network downstream again, claim that the first group of normally closed switch input termination, contact in high frequency choke inductor and downstream and a side that connects are downstream high frequency choke inductor front end, be called for short downstream choke front end, claim that high frequency choke inductor and first group of normally closed switch output contact termination, downstream and a side that connects are high frequency choke inductor rear end, downstream, be called for short choke rear end, downstream.Second group is high pressure normal open switch device, be called for short the second group of normal open switch in downstream, be used for the closed or disconnection between control downstream high-voltage capacitor group and the ground termination points, be three high-voltage capacitors in the high-voltage capacitor group of downstream the three-phase input end head respectively with downstream high frequency choke bank of inductors in the corresponding connection of three downstream high frequency choke inductor front ends, the three-phase output end head of three high-voltage capacitors is inputted the corresponding connection in termination, contact, the three-phase output contact termination common ground of the second group of normal open switch in downstream with the three-phase of the second group of normal open switch in downstream respectively.When signal processor control command start-up system enters operating state, the input interface of downstream high-tension switch cabinet receives the power amplification signal of remote control signal receiving module output, under the driving of power signal, first group of normally closed switch contact, downstream disconnects, three high frequency choke inductors in the high frequency choke device group of downstream are in respectively the serial connection state in the triple line of power transmission network downstream, by high-frequency current the high impedance of downstream high frequency choke device group has been isolated the high-frequency current of power electronics transformation device output to " extension " in power transmission network downstream; Three high-voltage capacitors in the high-voltage capacitor group of downstream and earth point are connected, so that high-frequency current process power transmission network downstream, downstream high-voltage capacitor group, the earth point of the output of power electronics transformation device are got back to the earth terminal of power electronics transformation device, form three relatively independent high-frequency current loops; Meanwhile, high pressure 50Hz alternating current has been avoided shorted to earth by the high capacitive reactance of downstream high-voltage capacitor group.After remote control signal receiving module stopped downstream high-tension switch cabinet power output amplifying signal, two groups of derailing switches in the high-tension switch cabinet of downstream recovered ortho states, and namely wherein two groups of high-voltage switch gear device switches return to original normally closed or normally open.
Described downstream high frequency choke device group also comprises three inductors, and two end points of each inductor are corresponding with first group of high pressure normally closed switch device contact in the high-tension switch cabinet of downstream and connect respectively.Whether receive the power amplification signal function of remote control signal receiving module output when high-voltage switch gear moves according to the downstream high-tension switch cabinet, along with disconnection or the closure of first group of high pressure normally closed switch device contact, determined that three inductors of downstream high frequency choke device group are in serial connection or short circuit state in the transmission line of power transmission network downstream.When three inductors of downstream high frequency choke device group are connected in series respectively in the three phase transmission line, the different induction reactance values that the different frequency alternating current presented by this inductor can realize the choking effect to high frequency deicing electric current, and to the through-flow effect of the Low ESR of 50Hz low-frequency current.
Described downstream high-voltage capacitor group also comprises three high-voltage capacitors.The input termination of each high-voltage capacitor respectively with downstream high frequency choke bank of inductors in the corresponding connection of three downstream high frequency choke inductor front ends; The three-phase output end head of each high-voltage capacitor is inputted the corresponding connection in termination, contact with the three-phase of second group of high pressure normal open switch device respectively.Whether receive the power amplification signal function of remote control signal receiving module output when high-voltage switch gear moves according to the downstream high-tension switch cabinet, along with the closed or disconnection of second group of high pressure normal open switch device contact, determined the state that is switched on or switched off of downstream each high-voltage capacitor of high-voltage capacitor group and ground termination points.When second group of high pressure normal open switch of downstream high-tension switch cabinet device closing of contact, the high frequency deicing electric current that shows power electronics transformation device output interface output can utilize the low capacitive reactance of high-voltage capacitor to form the loop by earth point smoothly, and 50Hz high pressure low-frequency current is subject to stopping of the high capacitive reactance of high-voltage capacitor and can be by short circuit.
The value of described three upstream high frequency choke inductors and three downstream high frequency choke inductors is according to its induction reactance computing formula Z L=2 π fL determine different frequency alternating voltage attenuation degree, will guarantee that namely the 50Hz alternating voltage is at Z LDecay minimum on the induction reactance and high frequency deicing voltage are at Z LOn decay maximum, and then select an optimal inductor L value.
The value of described three upstream high-voltage capacitors and three downstream high-voltage capacitors is according to its capacitive reactance computing formula
Figure BDA0000050140740000121
Different frequency alternating voltage attenuation degree is determined, will be guaranteed that namely the 50Hz alternating voltage is at Z CDecay maximum in the capacitive reactance and high frequency deicing voltage are at Z COn decay minimum, and then select an optimal capacitor C value.
Intermittently whole operation principle and the process of Intelligent preventive control system are not as follows in the power supply of power transmission network ice slush disaster:
The power transmission network image transmitting that imageing sensor gathers is to signal processor, and signal processor is identified according to present image; In case confirm ice slush to occur on the current power transmission line, signal processor is namely to system controller and remote signal sending module sending controling instruction, the system controller output drive signal, start the upstream high-tension switch cabinet, former limit and the power transmission network upstream side three of electric power step-down transformer are connected, and power electronics transformation device, remote control signal receiving module, upstream high frequency choke device group, upstream high-voltage capacitor group, downstream high frequency choke device group, downstream high-tension switch cabinet, downstream high-voltage capacitor group all enter operating state synchronously.At this moment, entered upstream high frequency choke device group and downstream high frequency choke device group by serial connection respectively in the both sides, upstream and downstream of power transmission network, namely the both sides, upstream and downstream of each phase line are entered a high frequency choke inductor by serial connection respectively; The large current energy signal of high frequency of power transmission network upstream side power electronics transformation device output is imported into deicing section circuit in the power transmission network by upstream high-voltage capacitor group, earth terminal through power transmission network downstream high-voltage capacitor group, ground termination points and power electronics transformation device forms three relatively independent high-frequency current loops, and the ice slush that the heat that utilizes the Joule effect of the large current energy signal of high frequency on power transmission line to produce impels power transmission line to condense melts.Because upstream high frequency choke device group and downstream high frequency choke device group are to the high induction reactance choking effect of the large current energy signal of high frequency, so that neither can " be poured in down a chimney " to the upstream of power transmission network by the high-frequency current of " injection " in the power transmission line, can be to the downstream " extension " of power transmission network yet, and form smoothly oneself " electric current ice-melt " loop by the low capacitive reactance of upstream high-voltage capacitor group and downstream high-voltage capacitor group; Simultaneously, original 50Hz high-tension electricity can't because of upstream high frequency choke device group, upstream high-voltage capacitor group, downstream high frequency choke device group, downstream high-voltage capacitor group in electrical network access and affected its original transmission channel, because high frequency choke inductor and high-voltage capacitor present respectively low induction reactance and high capacitive reactance to the 50Hz high-tension electricity, therefore guaranteeing that original high-tension current in the power transmission network " unimpeded ", can not be short-circuited from upstream high-voltage capacitor group or downstream high-voltage capacitor group yet.Ice detachment of the present invention has not function intermittently of original power supply, therefore is referred to as power transmission network ice slush disaster " power supply is not intermittently " prevention and control system.
Power electronics transformation device among the present invention can be according to the detected high-frequency current composition of current sensor and voltage feedback signal, regulate the frequency of the large current energy signal of its output high frequency, the size of voltage and current by the SPWM waveform, the ice slush that power transmission network is occurred can melt under only high-frequency current effect.
Power electronics transformation device among the present invention can also realize that the mutual phase place of the large electric current of high frequency on the three-phase conducting wire is according to the conversion of taking turns of predetermined rule by the SPWM signal after its phase shift generation submodule output phase shift, cause ice slush best association of appearance when being subject to the heat thawing of wire to compel to shake, cause the attrition crushing of ice slush, thereby accelerate coming off of conductive line surfaces ice slush, reach economize on electricity, timesaving good result.
The present invention can also judge whether system is working properly from the detected high-frequency current signal of current sensor: when the high-frequency current value of feedback is zero, illustrate that high frequency deicing electric current does not form the loop, the upstream and downstream high-tension switch cabinet may break down etc.
After deicing begins, eliminated or reached predetermined technical standard when system identifies ice slush on the wire by image information, signal processor can send the control command that stops deicing to system's control and remote signal sending module in real time, system just finishes rapidly the sequence of operations instruction, except imageing sensor and signal processor keep the running status, on, downstream high-tension switch cabinet and high frequency choke bank of inductors thereof and high-voltage capacitor group all return to normal, namely be in the front non operating state of deicing, the power supply of electric power step-down transformer and power electronics transformation device is turned off, and remote signal sending module and remote control signal receiving module also are in resting state.
The power supply of power transmission network ice slush disaster involved in the present invention is Intelligent preventive control method intermittently not, and in advance with behind the detected wire in the image sensor alignment power transmission network scene, concrete steps are as follows:
Step 1, system initialization:
To the set accumulative total variable N of signal processor sending controling instruction number of times, initial assignment is zero, i.e. N=0.
Step 2, imageing sensor Real-time Collection power transmission network image scene.
When adopting the CCD camera of high-resolution, low-light (level), need not daytime by any fill-in light, night then need to be by the irradiation of secondary light source to power transmission network.
Imageing sensor takes every interval certain hour to gather piece image, gathers a width of cloth such as interval half an hour, and gathering image constantly automatically flicker illumination by secondary light source night.
Step 3, signal processor carry out the gray scale intensive treatment to the power transmission network image scene that receives, and pre-determined power transmission line zone is intercepted.
Step 4, to by the intercepting image-region carry out rim detection and binaryzation.
Step 5, calculate the size of current boundary line " diameter " D of transmission pressure according to edge detection results, and its " diameter " d with normal power transmission network wire is compared.
When D-d 〉=δ, assert that there is ice slush in current power transmission network wire and must be eliminated the accumulative total variable And execution in step six.
When D-d<δ, if N=0, then step 2 is got back to by system, continues to be monitored; Otherwise, i.e. N ≠ 0, execution in step 19.
Wherein, δ is the decision threshold of determining through experiment in advance.
Described " diameter ", refer in by the intercepting image-region, the distance size of (or claiming on the vertical direction) corresponding borderline two boundary points, the i.e. absolute value of these two boundary point pixel column coordinate differences on the image line coordinate to binaryzation Boundary Detection result.
Order, image coordinate by the intercepting image-region is (i, j), i, j be the row and the pixel coordinate value of row of presentation video coordinate respectively, then can being expressed as apart from size of (or claiming on vertical direction) borderline two boundary points of correspondence on the image line coordinate | j 1-j 2|; J wherein 1, j 2Respectively representative: corresponding a certain row-coordinate i nOn, the pixel column coordinate of upper and lower boundary point behind the wire image binaryzation.
When judging whether D-d 〉=δ sets up, directly adopt the row pixel count to express the distance size of two boundary points of correspondence on the vertical direction, can be so that the differentiation computing be simple and quick.
Step 6, signal processor are to system controller and remote signal sending module transmitting system deicing control command.
The digital control instruction that step 7, remote signal sending module will receive is carried out Digital Modulation by the modulation submodule to carrier signal, high-frequency signal after the modulation is delivered to transmitting antenna and is outwards launched Digital Modulation control command signal after carrying out power amplification through the power amplification submodule.
Step 8, remote control signal receiving module receive the Digital Modulation control command signal that the remote signal sending module is launched by reception antenna, modulation signal is carried out demodulation, digital-to-analogue conversion and power amplification successively, then drive the downstream high-tension switch cabinet, the control law that allows the downstream high-tension switch cabinet arrange according to instruction is implemented control to the switch contact in power transmission network downstream.
First group of normally closed switch contact of step 9, downstream high-tension switch cabinet disconnects, make three high frequency choke inductors in the high frequency choke device group of downstream in the triple line of power transmission line downstream, be in respectively the serial connection state, by high-frequency current the high impedance of downstream high frequency choke device group has been isolated the high-frequency current of power electronics transformation device output to " extension " in power transmission network downstream; Second group of normal open switch closing of contact of downstream high-tension switch cabinet, three high-voltage capacitors in the high-voltage capacitor group of downstream and earth point are connected, so that the high-frequency current of power electronics transformation device output can pass through the earth terminal that the power electronics transformation device is got back in power transmission network downstream, downstream high-voltage capacitor group, earth point, form a kind of high-frequency current loop; At this moment, high pressure 50Hz alternating current has been avoided shorted to earth by the high capacitive reactance of downstream high-voltage capacitor group.
Step 10, system controller drive upstream high-tension switch cabinet startup controlled plant and enter the deicing operating mode, be that electric power step-down transformer, power electronics transformation device are in running order synchronously, the electric power step-down transformer is subjected to the control realization of the first group of normal open switch in upstream and being communicated with of power transmission network, three high frequency choke inductors in the high frequency choke device group of upstream are entered in the upstream three-phase line of power transmission network by serial connection respectively by the control of the second group of normally closed switch in upstream, play the effect of the large electric current of isolation high frequency, namely do not cause high frequency deicing electric current " to pour in down a chimney " the electrical network upstream; Three high-voltage capacitors in the high-voltage capacitor group of upstream are communicated with the corresponding termination of power electronics transformation device output interface respectively by the control of the 3rd group of normal open switch in upstream.Upstream high-voltage capacitor group not only can play the effect of isolation 50Hz High Level AC Voltage, but also be the high frequency deicing electric current and the interface channel of power transmission network upstream of power electronics transformation device output, not only guaranteed the unimpeded of high frequency deicing electric current but also intercepted 50Hz High Level AC Voltage " falling to rush ".
Step 11, a power electronics transformation device output minute three-phase independent loop carries out work, and namely the U of power transmission network, V, W three-phase are passed into respectively the three road mutual phase places that are subjected to SPWM control according to the high frequency deicing current signal of predetermined rule, the conversion of taking turns.The specific works process of power electronics transformation device is:
(1) the first output port of SPWM generation submodule, the second output port are inputted first pair of SPWM control signal to the SPWM signal input port of the first electronic power switch major loop submodule control signal input port and phase shifting control submodule respectively.
Described " a pair of SPWM control signal ", to be the bridge type inverse topological structure for power electronics transformation device main circuit, SPWM occur submodule must to full bridge inverter main circuit export a pair of each other anti-phase two kinds of SPWM control signals control respectively full bridge inverter main circuit upper and lower arm the electronic power switch device conducting or close.
(2) the phase shifting control submodule carries out two groups of phse conversions simultaneously to first pair of SPWM control signal, so that two couple of transformation results output and first pair of SPWM control signal form the SPWM control signal of ad hoc rules and cyclic variation phase place.
Described " ad hoc rules and cyclic variation phase place ", with the SPWM control signal (being called for short " SPWM upper arm control signal " or " upper arm control signal ") of control full bridge inverter main circuit upper arm electronic power switch device, the phase relation of the upper arm control signal in the three pairs of SPWM control signals is as shown in table 1 below.
The phase relation table of table 1 three road SPWM control signals
The control signal phase place The SPWM1 phase place The SPWM2 phase place SPWM3
First kind combination Benchmark Homophase Homophase
The Equations of The Second Kind combination Benchmark Homophase Anti-phase
The combination of the 3rd class Benchmark Anti-phase Anti-phase
The combination of the 4th class Benchmark Anti-phase Homophase
In table 1, take first pair of SPWM upper arm control signal phase place as benchmark, be other two for SPWM upper arm control signal phase place change all relative first pair of SPWM upper arm control signal phase places, and with first, second and third to the upper arm control signal phase place of SPWM referred to as SPWM1 phase place, SPWM2 phase place and SPWM3 phase place.
(3) under the control of three pairs of SPWM control signals, three road Power Electronic Circuits in the power electronics transformation device are treated each other the deicing circuit to three and are exported mutual phase place and three pairs of three road high frequency deicing current signals that SPWM upper arm control signal phase place is corresponding, and can enough Mathematical Modelings be expressed as follows:
Figure BDA0000050140740000161
(formula one)
Wherein, i U, i V, i WBe respectively the high-frequency current instantaneous value that U, V, W three-phase deicing circuit occur; I mBe the high-frequency current amplitude; ω is the angular frequency of high frequency deicing electric current; Initial phase for high frequency deicing electric current; T is time variable; T is the sequence switch control signal cycle;
Figure BDA0000050140740000163
For rounding symbol downwards.
(4) under the interaction of three road high frequency deicing current signal phase differences, three line conductors be the generating period variation attract each other or repel, can when large electrical current heat melts, impel the fragmentation of ice slush on the wire, therefore can shorten significantly the deicing time.Take U, V, W three-phase conducting wire do axially that isosceles triangle distributes and U as example, when
Figure BDA0000050140740000164
The time, i V, i WWith i UHomophase, under the interaction of three-phase conducting wire electromagnetic field magnetic induction, the U phase conductor is to lower swing, and V, W two phase conductors swing respectively to the inside, and the rest may be inferred by analogy.
(5) by regulating the sequencing control level signal of the optimum frequency of phase shifting control submodule, by SPWM submodule occuring regulates only SPWM waveform frequency and duty ratio again, just can make No. three electronic power switch major loop submodules output to the three high frequency deicing electric currents for the treatment of each other on the deicing wire and reach optimum frequency, amplitude and the heat thawing effect that electricity causes the machinery concussion, therefore finally reach deicing and energy-saving and cost-reducing optimal effectiveness.
Described electricity causes the optimum frequency of machinery concussion, is determined by timing control signal.
The output termination of first and second phase-shift circuit is defined as respectively G in first and second phase shifting control submodule a, G bAnd G c, G dThe time, the output termination G of corresponding the first phase-shift circuit a, G bThe sequence switch signal voltage value can be expressed as follows:
U Ga ( t ) = 1 ( A ) ; nT &le; t T < ( 2 n + 1 ) T 2 , n = 0,1,2 , . . . , &infin; 0 ( B ) ; ( 2 n + 1 ) T 2 &le; t T < ( n + 1 ) T , n = 0,1,2 , . . . , &infin; (formula two)
With
U Gb ( t ) = 1 ( A ) ; ( 2 n + 1 ) T 2 &le; t T < ( n + 1 ) T , n = 0,1,2 , . . . , &infin; 0 ( B ) ; nT &le; t T < ( 2 n + 1 ) T 2 , n = 0,1,2 , . . . , &infin; (formula three)
The output termination G of corresponding the second phase-shift circuit c, G dThe sequence switch signal can be expressed as follows:
U Gc ( t ) = 1 ( A ) ; ( 4 n - 1 ) T 4 &le; t T < ( 4 n + 1 ) T 4 , n = 0,1,2 , . . . , &infin; 0 ( B ) ; ( 4 n + 1 ) T 4 &le; t T < ( 4 n + 3 ) T 4 , n = 0,1,2 , . . . , &infin; (formula four)
With
U Gd ( t ) = 1 ( A ) ; ( 4 n + 1 ) T 4 &le; t T < ( 4 n + 3 ) T 4 , n = 0,1,2 , . . . , &infin; 0 ( B ) ; ( 4 n - 1 ) T 4 &le; t T < ( 4 n + 1 ) T 4 , n = 0,1,2 , . . . , &infin; (formula five)
The high and low level width of timing control signal and change frequency thereof determined by the T in (formula two)~(formula five), and how this select the T of size, then confirms by field experiment.Wherein, 1 (A) is illustrated under the effect of conducting control signal level value A, and the electronic power switch device is output as high level signal; 0 (B) is illustrated under the effect of turn-offing control signal level value B, and the electronic power switch device is output as low level signal.
Described electricity causes the best amplitude of machinery concussion, by the duty ratio decision I of SPWM waveform mSize, I mSize determined again the size of the suffered electromagnetic force of wire, finally determine the amplitude that the effect lower wire at high frequency deicing electric current swings, namely electricity causes machinery concussion amplitude.With i V, i WWith i UHomophase is example, and the corresponding suffered electromagnetic attraction active force of every wire can be expressed as follows:
F UV = F VU = &mu; 0 I U I V 2 &pi; a UV L F UW = F WU = &mu; 0 I U I W 2 &pi; a UW L F VW = F WV = &mu; 0 I V I W 2 &pi; a VW L (formula six)
Wherein, F UVBe the active force of U phase conductor to the V phase conductor, the rest may be inferred by analogy; I U, I V, I WBe respectively the high frequency deicing current effective value of the U that flows through, V, W phase; μ 0Be permeability of vacuum; a UVBe the spacing between U, V two phase conductors, the rest may be inferred by analogy; L is conductor length, generally refers to the distance between two an iron rake with three to six teeths of power transmission network herein.Can be found out that by (formula six) electric current on the wire of flowing through is the decisive factor that determines the stressed size of wire.The fiducial value of concrete definite SPWM waveform duty cycle also will be determined by the field experiment of special transmission net.
Described optimal heat melts effect, by the frequency of SPWM waveform and the duty ratio size of the high frequency deicing electric current on the wire that determines to flow through, and then heating effect of current can be expressed as follows:
Q=0.24I 2Rt (formula seven)
Wherein, I is the high frequency deicing current effective value of U, V, W phase of flowing through, and works as I U, I V, I WWhen equating, I=I U=I V=I WThe concrete value of I will be determined by the field experiment of special transmission net.
The current signal that step 12, current sensor detect on the power transmission network wire feeds back to the power electronics transformation device.
Step 13, the feedback current signal is carried out filtering, extract high-frequency current signal i wherein f, and it is judged computing.
Work as i f≤ δ fThe time, illustrating that the high-frequency alternating current that the elimination ice slush is used not yet forms the loop, forecasting system equipment may break down, execution in step 18.Wherein, δ fThe decision threshold that whether works for eliminating the ice slush high-frequency alternating current, concrete value is determined by experiment.
Work as δ f<i fAnd i f-i 0<0 o'clock, illustrate that the high-frequency alternating current of eliminating ice slush is working properly, but its current value is on the low side, execution in step 14, regulate the output waveform of SPWM, improve duty ratio, strengthen the equivalent voltage of power electronics transformation device output, that is increase the high-frequency alternating current flow valuve of eliminating ice slush in the three-phase loop, increase ice-melt energy and wire shock range.Wherein, i 0For eliminating the high-frequency ac current set point of ice slush, its size is determined by experiment.
Work as δ f<i fAnd i f-i 0>0 o'clock, illustrate that the high-frequency alternating current of eliminating ice slush is working properly, but its current value is higher, execution in step 16, regulate the output waveform of SPWM, reduce duty ratio, reduce the equivalent voltage of power electronics transformation device output, that is reduce the high-frequency alternating current flow valuve of the elimination ice slush in the three-phase loop, reduce ice-melt energy and wire shock range.
The duty ratio of step 14, raising SPWM output waveform.
Step 15, i f-i 0〉=0? be execution in step two; Otherwise, return step 14.
The duty ratio of step 10 six, reduction SPWM output waveform.
Step 10 seven, i f-i 0≤ 0? be execution in step two; Otherwise, return step 10 six.
Step 10 eight, report to the police, bulletin need to place under repair and safeguards system, then continues execution in step two.
Step 10 nine, signal processor be to system controller and the program control instruction of remote signal sending module transmitting system elimination ice slush out of service, and return step 1, continues to monitor wire ice slush situation.
The present invention has following advantage:
(1) the power transmission network image scene that collects of imageing sensor is identified computing by signal processor, can whether form ice slush to monitored power transmission line and carry out intelligent decision, has realized the intelligent surveillance in the unattended operation situation of power transmission network ice slush situation.
(2) in a single day signal processor identifies power transmission network and ice slush occurs, namely can be in real time, automatically to system controller and remote signal sending module sending controling instruction.System controller converts the control command that receives to the driving signal, and startup upstream high-tension switch cabinet, electric power step-down transformer, power electronics transformation device, upstream high frequency choke device group, upstream high-voltage capacitor group enter the de-icing work state; The remote signal sending module is sent to remote control signal receiving module with remote signal, under the driving control of remote control signal receiving module, downstream high frequency choke device group, downstream high-tension switch cabinet, downstream high-voltage capacitor group and upstream equipment enter the de-icing work state synchronously.
(3) action of the high-voltage switch gear in the high-tension switch cabinet of upstream and downstream makes " single " transmitting loop structural change under original normal power supply operating mode be " double loop mixing " topological structure.Namely utilize the inductor that is connected in series in the three-phase line with and the capacitor that connects the different frequency alternating current is presented different impedance operators, the alternating current of two kinds of different frequencies is mobile according to path separately, isolation and the shunting of the high-frequency alternating electric current of original 50Hz alternating current and the output of power electronics transformation device in the power transmission network have been guaranteed, can accomplish not affect the de-icing work under original transmission of electricity operating mode, so the present invention is called as " power supply of power transmission network ice slush disaster not intermittently Intelligent preventive control System and method for ".
(4) occur under the acting in conjunction of submodule and phase shifting control submodule at SPWM, so that the high-frequency current generation electricity that exports on the three-phase deicing circuit causes machinery concussion effect.The suitable sequencing control level signal of time schedule controller output in the phase shifting control submodule just can be guaranteed to produce between the three-phase conducting wire suitable machinery concussion frequency and impel the ice slush on the wire to accelerate to come off.Simultaneously, can also regulate the SPWM waveform that submodule output suitable frequency and duty ratio occur SPWM, make No. three electronic power switch major loop submodules treat each other the deicing wire to three and export optimum high-frequency high-power electric current, guaranteeing that three-phase conducting wire is being subject to producing the best amplitude that electricity causes the machinery concussion when the large electrical current heat of high frequency melts.Therefore can shorten significantly the time of deicing, reach and save the optimal effectiveness that heat is melted power consumption.
(5) system of the present invention can improve the electrical network quality of power supply as reactive power compensation and the harmonic carcellation device of electric power system during non-freezing season by the cooperation that the Function Extension of controlling software is connected with the high-voltage switch gear contact.
Description of drawings
Fig. 1 is system configuration schematic diagram of the present invention.
Fig. 2 is system controller structural principle schematic diagram of the present invention.
Fig. 3 is upstream of the present invention high-voltage switch gear cabinet and connected mode schematic diagram.
Fig. 4 is downstream of the present invention high-voltage switch gear cabinet and connected mode schematic diagram.
Fig. 5 is electric power step-down transformer connected mode schematic diagram of the present invention.
Fig. 6 is remote signal sending module structural principle schematic diagram of the present invention.
Fig. 7 is remote control signal receiving module structural principle schematic diagram of the present invention.
Fig. 8 is power electronics transformation device structural principle schematic diagram of the present invention.
Fig. 9 is Switching Power Supply control module structure principle chart of the present invention.
Figure 10 is the connection diagram that submodule and phase shifting control sub modular structure principle etc. occur SPWM of the present invention.
Figure 11 is phase shifting control submodule sequencing control oscillogram of the present invention.
Figure 12 is deicing current phase graph of a relation in the electricity transmission three-phase wire of the present invention;
Wherein, (a) be T among corresponding Figure 11 1Phase relation before constantly arriving; (b) be T among corresponding Figure 11 2Phase relation before constantly arriving; (c) be T among corresponding Figure 11 3Phase relation before constantly arriving; (c) be T among corresponding Figure 11 4Phase relation before constantly arriving.
Figure 13 is the force vector figure of electricity transmission three-phase wire of the present invention when the deicing current phase alternately changes;
Wherein, (a) be the formed force vector figure of corresponding Figure 12 (a) phase relation of three-phase conducting wire; (b) be the formed force vector figure of corresponding Figure 12 (b) phase relation of three-phase conducting wire; (c) be the formed force vector figure of corresponding Figure 12 (c) phase relation of three-phase conducting wire; (d) be the formed force vector figure of corresponding Figure 12 (d) phase relation of three-phase conducting wire.
Figure 14 is IMAQ of the present invention and process legend;
Wherein, (a) gathered power transmission network image example by imageing sensor; (b) be intercepting specific region image example; (e) be the rim detection example of specific region sectional drawing, and wire " diameter " computational methods schematic diagram.
Figure 15 is the inventive method step main program flow block diagram.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment
As shown in Figure 1, the power supply of the related power transmission network ice slush of present embodiment disaster is Intelligent preventive control system intermittently not, comprising: imageing sensor 1, signal processor 2, system controller 3, upstream high-tension switch cabinet 4, remote signal sending module 5, electric power step-down transformer 6, power electronics transformation device 7, power transmission network 8, remote control signal receiving module 9, downstream high-tension switch cabinet 10, upstream high frequency choke device group 11, upstream high-voltage capacitor group 12, downstream high frequency choke device group 13, downstream high-voltage capacitor group 14, current sensor 15.Wherein, the output interface of imageing sensor 1 is connected with the input interface of signal processor 2; The output interface of signal processor 2 is connected with the digital input interface of system controller 3 and remote signal sending module 5; The output interface of system controller 3 is connected with the control signal input interface of upstream high-tension switch cabinet 4; Three input terminations, contact of first group of normal open switch in the upstream high-tension switch cabinet 4 are connected with power transmission network 8 upstream three-phase end points, and three output contact terminations of first group of normal open switch in the upstream high-tension switch cabinet 4 are connected with the former limit three-phase input end point of electric power step-down transformer 6; The secondary three-phase output end point of electric power step-down transformer 6 and neutral point are connected with the power input interface of power electronics transformation device 7, the current detection signal input interface of power electronics transformation device 7 is connected with the output interface of current sensor 15, current sensor 15 is arranged in any one loop of power electronics transformation device 7, the neutral ground of electric power step-down transformer 6; Three high potential exit points of power electronics transformation device 7 output interfaces are connected with three input terminations, contact of the 3rd group of normal open switch in the upstream high-tension switch cabinet 4, and three electronegative potential exit points of power electronics transformation device 7 output interfaces altogether; Three input terminations of three high-voltage capacitors in the upstream high-tension switch cabinet 4 in three output contact terminations of the 3rd group of normal open switch and the upstream high-voltage capacitor group 12 are connected; Three of three high-voltage capacitors in the upstream high-voltage capacitor group 12 output terminations respectively with upstream high frequency choke device group 11 in the corresponding connection in three terminations, three high frequency choke inductor rear ends; Three pairs of terminations of three high frequency choke inductor front and back ends in the upstream high frequency choke device group 11 respectively corresponding with input, the three pairs of terminations of output of second group of normally closed switch in the upstream high-tension switch cabinet 4 and connect after, be serially connected with respectively again in the three-phase corresponding line of power transmission network 8 upstreams; Remote signal sending module 5 is by the reception antenna transmission remote signal of transmitting antenna to remote control signal receiving module 9; The output interface of remote control signal receiving module 9 is connected with the input interface of downstream high-tension switch cabinet 10; Three pairs of terminations of three high frequency choke inductor front and back ends in the input of first group of normally closed switch in the downstream high-tension switch cabinet 10, the three pairs of terminations of output and the downstream high frequency choke device group 13 and connect after, be serially connected with again in the three-phase corresponding line in power transmission network 8 downstreams; Three of three high-voltage capacitors in the downstream high-voltage capacitor group 14 input terminations respectively with downstream high frequency choke device group 13 in the corresponding connection in three terminations of three high frequency choke inductor front ends, export the termination common grounds for three of three high-voltage capacitors in the downstream high-voltage capacitor group 14.
Imageing sensor 1 in the present embodiment, signal processor 2, system controller 3, upstream high-tension switch cabinet 4, remote signal sending module 5, electric power step-down transformer 6, power electronics transformation device 7 are arranged at power transmission network 8 upstream transformer stations (institute); Remote control signal receiving module 9, downstream high-tension switch cabinet 10, upstream high frequency choke device group 11, upstream high-voltage capacitor group 12, downstream high frequency choke device group 13, downstream high-voltage capacitor group 14 are arranged at power transmission network 8 downstream transformer stations (institute); Current sensor 15 is arranged on the power transmission network 8 upstream U phase power transmission lines.
As shown in Figure 2, described system controller 3 comprises: digital input interface 31, D/A converter module 32, drive amplification module 33, analog signal output interface 34.Wherein, the input port of digital input interface 31 is connected with the output interface of signal processor 2, the output port of digital input interface 31 is connected with the input port of D/A converter module 32, and the output port of D/A converter module 32 is connected with the input port of drive amplification module 33; The output port of drive amplification module 33 is connected with the input port of analog signal output interface 34, and the output port of analog signal output interface 34 is the output interface of system controller 3.The output interface of system controller 3 is connected with the input interface of upstream high-tension switch cabinet 4, system controller 3 received control commands are converted to analog signal and process amplification rear drive upstream high-tension switch cabinet 4, start its high-voltage switch gear device action, make the present embodiment system enter the de-icing work state.
As shown in Figure 3, described upstream high-tension switch cabinet 4 comprises three groups of high-voltage switch gear devices.First group is high pressure normal open switch device, be called for short the first group of normal open switch 41 in upstream, the three-phase input termination, contact of the first group of normal open switch 41 in upstream is connected with power transmission network 8 upstream three-phase end points, and the three-phase output contact termination of the first group of normal open switch 41 in upstream is connected with three-phase termination, electric power step-down transformer 6 former limit.Second group is high pressure normally closed switch device, be called for short the second group of normally closed switch 42 in upstream, the three-phase of the second group of normally closed switch 42 in upstream input termination, contact respectively with upstream high frequency choke device group 11 in three high frequency choke inductors 111,112,113 1 side heads correspondence also connects, the three-phase output contact termination of the second group of normally closed switch 42 in upstream respectively with upstream high frequency choke device group 11 in three high frequency choke inductors 111,112,113 opposite side termination correspondence also connects, both and connect after, with three high frequency choke inductors 111,112,113 are serially connected with respectively in the power transmission network 8 upstream three phase lines again, and title high frequency choke inductor 111,112,113 with second group of normally closed switch in upstream 42 input terminations, contact and the side that connects be upstream high frequency choke inductor 111,112,113 front ends, be called for short upstream choke front end, claim high frequency choke inductor 111,112,113 with second group of normally closed switch, 42 output contact terminations, upstream and the side that connects be upstream high frequency choke inductor 111,112, choke rear end, upstream is called for short in 113 rear ends.The 3rd group is high pressure normal open switch device, be called for short the 3rd group of normal open switch 43 in upstream, the three-phase of the 3rd group of normal open switch 43 in upstream input termination, contact is connected with the three-phase output end head of power electronics transformation device 7 respectively, the three-phase output contact termination of the 3rd group of normal open switch 43 in upstream respectively with upstream high-voltage capacitor group 12 in three high-voltage capacitors 121,122,123 the corresponding connection of three-phase input end head; Three high-voltage capacitors 121 in the upstream high-voltage capacitor group 12,122,123 three-phase output end head respectively with upstream high frequency choke bank of inductors 11 in three corresponding connections in upstream high frequency choke inductor 111,112,113 rear ends.When signal processor 2 control command startup system control devices, so when driving derailing switch action in the upstream high-voltage board 4, first group of normal open switch 41 closure in upstream, electric power step-down transformer 6 former limits and power transmission network 8 upstreams three are connected; The second group of normally closed switch 42 in upstream is opened, so that be in the state that is connected in series respectively with itself and three high frequency choke inductors 111,112,113 of connecing in the three phase transmission line upstream, play the effect of controlling to high-frequency current, therefore can stop the high-frequency current of power electronics transformation device 7 outputs to " feedback flows backwards " of power transmission network 8 upstreams; The 3rd group of normal open switch 43 in upstream is closed, three high-voltage capacitors in the upstream high-voltage capacitor group 12 are exported corresponding connection with the three-phase high-frequency current of power electronics transformation device 7 respectively, by the high capacitive reactance characteristic of capacitor to low-frequency current, can stop the 50Hz High Level AC Voltage to power electronics transformation device 7 output interfaces " rushing short circuit ".That is to say that the connected mode of power transmission network 8 upstream high frequency choke device groups 11 and upstream high-voltage capacitor group 12 can be guaranteed present embodiment in the de-icing work process, 40kHz high-frequency alternating current and 50Hz High Level AC Voltage are in " in order " shunting of power transmission network 8 upstreams.When the input interface of upstream high-tension switch cabinet 4 receives " interruption " signal of signal processor 2 outputs, three groups of high-voltage switch gear devices in the upstream high-tension switch cabinet 4 return to normal, namely return to original often opening or normally off, so that electric power step-down transformer 6 input interfaces are not access in three-phase high-voltage, simultaneously, three high frequency choke inductors 111 in the upstream high frequency choke device group 11,112,113 are in " short circuit " state, be that power transmission network 8 upstreams are not by three high frequency choke inductors 111 in the upstream high frequency choke device group 11,112,113 be connected in series, be in off-state between upstream high-voltage capacitor group 11 and power electronics transformation device 7 output interfaces, power transmission network 8 is not by high-frequency current " injection ".
As shown in Figure 4, described downstream high-tension switch cabinet 10 comprises two groups of high-voltage switch gear devices.First group is high pressure normally closed switch device, be called for short the first group of normally closed switch 101 in downstream, the three-phase of the first group of normally closed switch 101 in downstream input termination, contact respectively with downstream high frequency choke device group 13 in three high frequency choke inductors 131,132,133 1 side heads correspondence also connects, the three-phase output contact termination of the first group of normally closed switch 101 in downstream respectively with downstream high frequency choke device group 13 in three high frequency choke inductors 131,132,133 opposite side termination correspondence also connects, both and connect after, with three high frequency choke inductors 131,132,133 are serially connected with respectively in the power transmission network 8 downstream three phase lines again, claim high frequency choke inductor 131,132,133 with first group of normally closed switch in downstream 101 input terminations, contact and the side that connects be downstream high frequency choke inductor 131,132,133 front ends, be called for short downstream choke front end, claim high frequency choke inductor 131,132,133 with first group of normally closed switch, 101 output contact terminations, downstream and the side that connects be downstream high frequency choke inductor 131,132, choke rear end, downstream is called for short in 133 rear ends.Second group is high pressure normal open switch device, be called for short the second group of normal open switch 102 in downstream, be used for the closed or disconnection between control downstream high-voltage capacitor group 14 and the ground termination points, be three high-voltage capacitors 141 in the downstream high-voltage capacitor group 14,142,143 three-phase input end head respectively with downstream high frequency choke bank of inductors 13 in three downstream high frequency choke inductors 131,132,133 front ends are corresponding to be connected, three high-voltage capacitors 141,142,143 three-phase output end head is inputted the corresponding connection in termination, contact, the three-phase output contact termination common ground of the second group of normal open switch 102 in downstream with the three-phase of the second group of normal open switch 102 in downstream respectively.When signal processor 2 control command start-up systems enter the de-icing work state, the input interface of downstream high-tension switch cabinet 10 receives the power amplification signal of remote control signal receiving module 5 outputs, under the driving of power signal, first group of normally closed switch 101 contact, downstream disconnect, three high frequency choke inductors 131 in the downstream high frequency choke device group 13,132,133 are in respectively by the serial connection state in power transmission network 8 downstream triple lines, by high-frequency current the high impedance of downstream high frequency choke device group 13 have been isolated the high-frequency current of power electronics transformation device 7 outputs to " extension " in power transmission network downstream; Three high-voltage capacitors 141 in the downstream high-voltage capacitor group 14,142,143 and earth point connect, so that high-frequency current process power transmission network 8 downstreams, downstream high-voltage capacitor group 14, the earth point of 7 outputs of power electronics transformation device are got back to the earth terminal of power electronics transformation device 7, form three relatively independent high-frequency current loops; Meanwhile, high pressure 50Hz alternating current has been avoided shorted to earth by the high capacitive reactance of downstream high-voltage capacitor group 14.After remote control signal receiving module 9 stopped downstream high-tension switch cabinet 10 power output amplifying signals, downstream high-tension switch cabinet 10 recovered ortho states, and namely wherein two groups of high-voltage switch gear device switches return to original normally closed or normally open.
The value of described three upstream high frequency choke inductors and three downstream high frequency choke inductors is according to its induction reactance computing formula Z L=2 π fL determine different frequency alternating voltage attenuation degree, will guarantee that namely the 50Hz alternating voltage is at Z L=2 π f 1Decay minimum on the L=100 π L induction reactance and high frequency deicing voltage are at Z L=2 π f 2L=8 * 10 4Decay on the π L is maximum, and then selects an optimal inductor L value, and is determined at last by experiment according to both actual voltage values.
Equally, the value of described three upstream high-voltage capacitors and three downstream high-voltage capacitors is according to its capacitive reactance computing formula Different frequency alternating voltage attenuation degree is determined, will be guaranteed that namely the 50Hz alternating voltage exists
Figure BDA0000050140740000242
Decay maximum in the capacitive reactance and high frequency deicing voltage exists
Figure BDA0000050140740000243
On decay minimum, and then select an optimal capacitor C value, and determined at last by experiment according to both actual voltage values.
As shown in Figure 5, described electric power step-down transformer 6, former limit is that the three-phase triangle connects, and namely is input as three-phase three-wire system; Secondary is the three-phase Y-connection, namely is output as three-phase four-wire system.The secondary three-phase output end point of electric power step-down transformer 6 and neutral point are connected with the power input interface of power electronics transformation device 7; The secondary output voltage is 500~2000V, former/the secondary coil turn ratio needs determine according to input voltage, gets input, when output voltage is respectively 220kV and 1000V, single-phase former/the secondary coil turn ratio is 220: 1.
As shown in Figure 6, described remote signal sending module 5 comprises: digital signal input interface 51, carrier wave generation submodule 52, modulation submodule 53, power amplification submodule 54, transmitting antenna 55.The output port of digital signal input interface 51 is connected with the first input end mouth of modulation submodule 53, and the output port of carrier wave generation submodule 52 is connected with the second input port of modulation submodule 53; The output port of modulation submodule 53 is connected with the input port of power amplification submodule 54; The output port of power amplification submodule 54 is connected with the input port of transmitting antenna 55.When digital signal input interface 51 receives the digital command of exporting from signal processor 2, carry out Digital Modulation by 53 pairs of carrier signals of modulation submodule, after high-frequency signal after the modulation carries out power amplification through power amplification submodule 54, deliver to outwards emission Digital Modulation control command signal of transmitting antenna 55.After in a single day remote control signal receiving module 9 receives the Digital Modulation control command signal that remote signal sending module 5 launches, can implement control to the switch contact in power transmission network 8 downstreams according to the control law that instruction is arranged.
As shown in Figure 7, described remote control signal receiving module 9 comprises: reception antenna 91, demodulation submodule 92, digital-to-analogue conversion submodule 93, power amplification submodule 94, output interface 95.The output port of reception antenna 91 is connected with the input port of demodulation submodule 92, the output port of demodulation submodule 92 is connected with the input port of digital-to-analogue conversion submodule 93, and the output port of digital-to-analogue conversion submodule 93 is connected with the input port of power amplification submodule 94; The output port of power amplification submodule 94 is connected with the input port of output interface 95; The output interface 95 of remote control signal receiving module 9 is connected with the input interface of downstream high-tension switch cabinet 10.
As shown in Figure 8, described power electronics transformation device 7 comprises: power input interface 70, the first commutator module 711, the second commutator module 712, the 3rd commutator module 713, the first filtering submodule 721, the second filtering submodule 722, the 3rd filtering submodule 723, the first electronic power switch major loop submodule 731, the second electronic power switch major loop submodule 732, the 3rd electronic power switch major loop submodule 733, Switching Power Supply control module 74.The three-phase input end head of power input interface 70, be connected with three phase line output terminal heads of the three-phase four-wire system output interface of electric power step-down transformer 6 respectively, the ground wire termination of power input interface 70 is connected with the middle end (neutral point) of the three-phase four-wire system output interface of electric power step-down transformer 6; Three tunnel output terminations of power input interface 70 are connected with the input termination of the first commutator module 711, the second commutator module 712, the 3rd commutator module 713 respectively; The output termination of the first commutator module 711, the second commutator module 712, the 3rd commutator module 713 is connected with the input termination of the first filtering submodule 721, the second filtering submodule 722, the 3rd filtering submodule 723 respectively; The output termination of the first filtering submodule 721, the second filtering submodule 722, the 3rd filtering submodule 723 is connected with the power input end head of the first electronic power switch major loop submodule 731, the second electronic power switch major loop submodule 732, the 3rd electronic power switch major loop submodule 733 respectively; The output termination of the first electronic power switch major loop submodule 731, the second electronic power switch major loop submodule 732, the 3rd electronic power switch major loop submodule 733 is inputted the termination, contact with the three-phase of the 3rd group of normal open switch 43 in upstream respectively and is connected respectively; The control signal input termination of the first electronic power switch major loop submodule 731, the second electronic power switch major loop submodule 732, the 3rd electronic power switch major loop submodule 733 is connected with the output port of Switching Power Supply control module 74 respectively; The current detection signal input port of Switching Power Supply control module 74 is connected with the output interface of current sensor 15; The voltage detection signal input port of Switching Power Supply control module 74 is connected with the voltage feedback signal output interface of the 3rd electronic power switch major loop submodule 733 output loops.Wherein, first, second and third commutator module 711,712,713 rectification circuit adopt and can bear voltage 6kV and the above power diode of electric current 6kA consists of the bridge rectifier topological structure; The Γ type topological structure that first, second and third filtering submodule 721,722,723 filter circuit are made of inductance and electric capacity; First, second and third electronic power switch major loop submodule 731,732,733 adopt current capacities reach 1200A above, bear voltage and reach that 1800V is above, operating frequency reaches the above insulated gate bipolar transistor IGBT of 40kHz and consists of the bridge type inverse topological structure.
Shown in Fig. 9,10, described Switching Power Supply control module 74 comprises: high-frequency current detection signal input interface 740, high-frequency current filtering submodule 741, high-frequency current amplify submodule 742, high frequency voltage detection signal input interface 743, SPWM generation submodule 744, SPWM signal driver submodule 745, the first driver output port 746, the second driver output port 747, phase shifting control submodule 748, the first phase shift output interface 7485, the second phase shift output interface 7486.Wherein, the input port of high-frequency current detection signal input interface 740 is connected with the output interface of current sensor 15; The output port of high-frequency current detection signal input interface 740 is connected with the input port of high-frequency current filtering submodule 740; The output port of high-frequency current filtering submodule 741 is connected with the input port that high-frequency current amplifies submodule 742; The output port that high-frequency current amplifies submodule 742 is connected with the current signal input port that submodule 744 input interfaces occur SPWM; The input port of high frequency voltage detection signal input interface 743 is connected with the voltage feedback signal output interface of the 3rd electronic power switch major loop submodule 733, and the output port of high frequency voltage detection signal input interface 740 is connected with the high frequency voltage feedback signal input port that submodule 744 occurs SPWM; The output port that submodule 744 occurs SPWM is connected with the input port of SPWM signal driver submodule 745; The input port of the output port of SPWM signal driver submodule 745 and the first driver output interface 746, the second driver output interface 747 also connects; The output port of the first driver output interface 746 is connected with the control signal input port of the first electronic power switch major loop submodule 731; The output port of the second driver output interface 747 is connected with the SPWM signal input port of phase shifting control submodule 748; The first output port of phase shifting control submodule 748 is connected with the input port of the first phase shift output interface 7485, and the output port of the first phase shift output interface 7485 is connected with the control signal input port of the second electronic power switch major loop submodule 732; The second output port of phase shifting control submodule 748 is connected with the input port of the second phase shift output interface 7486, and the output port of the second phase shift output interface 7486 is connected with the control signal input port of the 3rd electronic power switch major loop submodule 733; All submodules in the power electronics transformation device 7 and are connected with the center line of electric power step-down transformer 6 secondary three-phase four-wire systems output altogether.
As shown in figure 10, in an embodiment, submodule 744 occurs and adopts SPWM special integrated chip UCC3895 to be achieved in SPWM.UCC3895 adopts the phase-shifting full-bridge PWM controller of BCDMOS technology, will decide frequency PWM technology and combine with zero voltage switching technology, has greatly improved the inversion frequency of frequency converter under high frequency.UCC3895 inside is integrated with accurate reference power supply, high-frequency generator, soft starting circuit, current foldback circuit, current detection circuit, unloaded comparator, undervoltage lockout circuit, driver output circuit, reference voltage observation circuit, postpones to arrange circuit, illegal state comparator, PWM latch, d type flip flop etc.The main performance index of UCC3895 is: the output turn on delay time is able to programme; Have adaptive delay set of time function, bi-directional oscillating device synchronizing function, voltage mode control or Controlled in Current Mode and Based function etc.; Soft start/soft-off, controller sheet select the controlled and single pin control of functional programming; The Duty ratio control scope is 0~100%; Built-in 7MHz error amplifier; Maximum operating frequency reaches 1MHz; Operating current is low, and the operating current under the 500kHz only is 5mA, and the electric current under the under-voltage locking state only is 150 μ A.
As shown in figure 10, phase shifting control submodule 748 comprises: SPWM signal input interface 7480, clock frequency generator 7481, time schedule controller 7482, the first phase-shift circuit 7483, the second phase-shift circuit 7484, the first phase shift output interface 7485, the second phase shift output interface 7486.The input port of SPWM signal input interface 7480 is connected with the output port of the second driver output interface 747; The SPWM signal input port of the output port of SPWM signal input port 7480 and the first phase-shift circuit 7483, the second phase-shift circuit 7484 also connects; The output port of clock frequency generator 7481 is connected with the input port of time schedule controller 7482; The output port of time schedule controller 7482 comprises G a, G b, G c, G dFour terminations, the corresponding clock signal output in each termination; G a, G bBe connected with first and second triggering control inputs termination of the first phase-shift circuit 7483 respectively; G c, G dBe connected with first, second triggering control inputs termination of the second phase-shift circuit 7484 respectively; The output port of the first phase-shift circuit 7483 is the first output port of phase shifting control submodule 748, is connected with the input port of the first phase shift output interface 7485; The output port of the second phase-shift circuit 7484 is the second output port of phase shifting control submodule 748, is connected with the input port of the second phase shift output interface 7486; The output port of the first phase shift output interface 7485, the second phase shift output interface 7486 is inputted the corresponding connection in termination with the control signal of second, third electronic power switch major loop submodule 732,733 respectively.The first phase-shift circuit 7483, the second phase-shift circuit 7484 structures are identical, consist of by two groups of electronic switches, and every group of electronic switch consists of by two bidirectional thyristors and a phase inverter, and each bidirectional thyristor comprises two main electrode T 1, T 2With control utmost point G (namely triggering the control inputs termination).Wherein, the main electrode T of two bidirectional thyristors of first of the first phase-shift circuit 7483 group of electronic switch 1And after connecing and the G of time schedule controller 7482 aThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Be communicated with by first termination of the first phase shift output interface 7485 with the control signal input port of the second electronic power switch major loop submodule 732 with the output termination of phase inverter and after connecing; The main electrode T of two bidirectional thyristors of second group of electronic switch of the first phase-shift circuit 7483 1And after connecing and the G of time schedule controller 7482 bThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Second of the control signal input port of the first phase shift output interface 7485 and the second electronic power switch major loop submodule 732 inputs the termination and is communicated with the output termination of phase inverter and after connecing; The main electrode T of two bidirectional thyristors of first group of electronic switch of the second phase-shift circuit 7484 1And after connecing and the G of time schedule controller cThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Be communicated with by first termination of the second phase shift output interface 7486 with the control signal input port of the 3rd electronic power switch major loop submodule 733 with the output termination of phase inverter and after connecing; The main electrode T of two bidirectional thyristors of second group of electronic switch of the second phase-shift circuit 7484 1And after connecing and the G of time schedule controller dThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Second of control signal input port by the second phase shift output interface 7486 and the 3rd electronic power switch major loop submodule 733 with the output termination of phase inverter and after connecing is inputted the termination and is communicated with.
Such as Figure 11,12, shown in 13, occur at SPWM under the acting in conjunction of submodule 744 and phase shifting control submodule 748, so that the high-frequency current generation electricity that exports on the three-phase deicing circuit causes machinery concussion effect, be that SPWM submodule 744 occurs to the waveform of the control signal input port output of the first electronic power switch major loop submodule 731 and it is through two phase-shift circuits 7483, phase place after 7484 phase shifts between formed two kinds of waveforms forms a kind of periodicity, well-regulated variation, therefore meeting is so that three electronic power switch major loop submodules 731,732, the high frequency voltage of 733 outputs has and three kinds of phase relations that the SPWM waveform phase is corresponding.In power transmission line equal characteristic impedance situation, still keeping the mutual phase relation of three to three road high frequency voltages of deicing circuit output formed electric current on circuit separately respectively.Because phase relation or homophase or anti-phase between three road electric currents, certainly will cause that three-phase conducting wire in the power transmission network is under the effect of electromagnetic field, produce each other the active force attract each other or repel, any power transmission line in two kinds of electric field composition of force results that form at other two power transmission lines so that three-phase conducting wire produces well-regulated concussion each other.The suitable sequencing control level signal of time schedule controller output in phase shifting control submodule 748, just can guarantee to produce between the three-phase conducting wire suitable machinery concussion frequency and impel the ice slush on the wire to accelerate to come off, adopt the cycle T=200ms of sequencing control comment signal such as present embodiment.Regulate suitable SPWM waveform frequency and duty ratio when submodule 744 occurs SPWM, can make No. three electronic power switch major loop submodules 731,732,733 treat each other the deicing wire to three and export optimum high-frequency high-power electric current, can guarantee that therefore three-phase conducting wire is being subject to producing the best amplitude that electricity causes the machinery concussion when the large electrical current heat of high frequency melts.Under the acting in conjunction of optimum high-frequency high-power electric current, suitable machinery concussion frequency and three key elements of best amplitude, accelerate the thawing of conductive line surfaces ice slush and come off, therefore can shorten the time of deicing, reach and save the effect that heat is melted power consumption.
The power supply that present embodiment also relates to power transmission network ice slush disaster is Intelligent preventive control method intermittently not, and shown in Figure 14 (a), after the detected wire in the image sensor alignment power transmission network scene arranged, as shown in figure 15, method step was as follows:
Step 1, system initialization.
Accumulative total variable N initial assignment to the setting of signal processor sending controling instruction number of times is zero, i.e. N=0.
Step 2, imageing sensor 1 Real-time Collection power transmission network image scene.
When adopting the CCD camera of high-resolution, low-light (level), need not daytime by any fill-in light, night then need to be by the irradiation of secondary light source to power transmission network.
Imageing sensor 1 is taked every interval half an hour collection piece image, constantly automatically glimmers at the collection image by secondary light source night to throw light on.
The power transmission network image scene that step 3,2 pairs of signal processors receive carries out intensive treatment, shown in Figure 14 (b), pre-determined power transmission line zone is intercepted.
Step 4, shown in Figure 14 (c), to by the intercepting image-region carry out rim detection and binaryzation.
Step 5, shown in Figure 14 (c), calculate the size of current boundary line " diameter " D of transmission pressure according to edge detection results, and its " diameter " d with normal power transmission network wire compared.The concrete method of averaged that adopts is passed judgment on, namely
D = &Sigma; j = 1 N D j N (formula eight)
Wherein, j=1,2,3 ..., N gets N=10;
Figure BDA0000050140740000292
Figure BDA0000050140740000293
Represent j row, l line number pixel coordinate,
Figure BDA0000050140740000294
Represent j row, k line number pixel coordinate, and l>k.
When D-d 〉=δ, assert that there is ice slush in current power transmission network 8 wires and must be eliminated the accumulative total variable
Figure BDA0000050140740000295
And execution in step six.
When D-d<δ, if N=0, then step 2 is got back to by system, continues to be monitored; Otherwise, i.e. N ≠ 0, execution in step 19.
Step 6, signal processor 2 are to system controller 3 and remote signal sending module 5 transmitting system deicing control commands.
The digital control instruction that step 7, remote signal sending module 5 will receive is carried out Digital Modulation by 53 pairs of carrier signals of modulation submodule, after high-frequency signal after the modulation carries out power amplification through power amplification submodule 54, deliver to outwards emission Digital Modulation control command signal of transmitting antenna 55.
Step 8, remote control signal receiving module 9 receive the Digital Modulation control command signal that remote signal sending module 5 is launched by reception antenna 91, modulation signal is carried out demodulation, digital-to-analogue conversion and power amplification, then drive downstream high-tension switch cabinet 10, the control law that allows downstream high-tension switch cabinet 10 arrange according to instruction is implemented control to the switch contact in power transmission network 8 downstreams.
First group of normally closed switch 101 contact of step 9, downstream high-tension switch cabinet 10 disconnect, three high frequency choke inductors 131,132,133 in the downstream high frequency choke device group 13 are in respectively by the serial connection state in the triple line of power transmission line downstream, by high-frequency current the high impedance of downstream high frequency choke device group 13 have been isolated the high-frequency current of power electronics transformation device 7 outputs to " extension " in power transmission network 8 downstreams; Three high-voltage capacitors 141 in the downstream high-voltage capacitor group 14,142,143 and earth point connect, so that high-frequency current process power transmission network 8 downstreams, downstream high-voltage capacitor group 14, the earth point of 7 outputs of power electronics transformation device are got back to the earth terminal of power electronics transformation device 7, form three relatively independent high-frequency current loops; At this moment, high pressure 50Hz alternating current has been avoided shorted to earth by the high capacitive reactance of downstream high-voltage capacitor group 14.
Step 10, system controller 3 drive upstream high-tension switch cabinet 4 startup controlled plants and enter the deicing operating mode, be that electric power step-down transformer 6, power electronics transformation device 7 are in running order, simultaneously, three high frequency choke inductors 111,112,113 in the upstream high frequency choke device group 11 are entered in the upstream three-phase line of power transmission network 8 by serial connection respectively, play the effect of the large electric current of isolation high frequency, namely do not cause high frequency deicing electric current " to pour in down a chimney " the electrical network upstream; Three high-voltage capacitors 121,122,123 in the upstream high-voltage capacitor group 12 are communicated with the corresponding termination of power electronics transformation device 7 output interfaces respectively.Upstream high-voltage capacitor group 12 not only can play the effect of isolation 50Hz High Level AC Voltage, but also be the high frequency deicing electric current and the interface channel of power transmission network 8 upstreams of power electronics transformation device 7 output, not only guaranteed the unimpeded of high frequency deicing electric current but also intercepted 50Hz High Level AC Voltage " falling to rush ".
Step 11, power electronics transformation device 7 pass into respectively three road high frequency deicing current signals of being controlled by SPWM to U, V, the W three-phase of power transmission network 8.
As shown in figure 11, the output port G of the time schedule controller 7482 of phase shifting control submodule 748 a, G b, G c, G dCorresponding clock signal can be expressed as:
U Ga ( t ) = 1 ( A ) ; nT &le; t T < ( 2 n + 1 ) T 2 , n = 0,1,2 , . . . , &infin; 0 ( B ) ; ( 2 n + 1 ) T 2 &le; t T < ( n + 1 ) T , n = 0,1,2 , . . . , &infin; (formula two)
U Gb ( t ) = 1 ( A ) ; ( 2 n + 1 ) T 2 &le; t T < ( n + 1 ) T , n = 0,1,2 , . . . , &infin; 0 ( B ) ; nT &le; t T < ( 2 n + 1 ) T 2 , n = 0,1,2 , . . . , &infin; (formula three)
U Gc ( t ) = 1 ( A ) ; ( 4 n - 1 ) T 4 &le; t T < ( 4 n + 1 ) T 4 , n = 0,1,2 , . . . , &infin; 0 ( B ) ; ( 4 n + 1 ) T 4 &le; t T < ( 4 n + 3 ) T 4 , n = 0,1,2 , . . . , &infin; (formula four)
With
U Gd ( t ) = 1 ( A ) ; ( 4 n + 1 ) T 4 &le; t T < ( 4 n + 3 ) T 4 , n = 0,1,2 , . . . , &infin; 0 ( B ) ; ( 4 n - 1 ) T 4 &le; t T < ( 4 n + 1 ) T 4 , n = 0,1,2 , . . . , &infin; (formula five)
In the present embodiment, get T=200ms.
Shown in Figure 12,13, occur at SPWM to have formed on U, V, the W three-phase deicing circuit and three pairs of three road high frequency deicing current signals that SPWM upper arm control signal phase place is corresponding, namely under the acting in conjunction of submodule 744 and phase shifting control submodule 748
Figure BDA0000050140740000312
(formula one)
And get high frequency deicing power frequency
Figure BDA0000050140740000313
High frequency deicing current amplitude
Under the interaction of three road high frequency deicing current signal phase differences, three line conductors be the generating period variation attract each other or repel, can when large electrical current heat melts, impel the fragmentation of ice slush on the wire, therefore can shorten significantly the deicing time.Finally reach deicing and energy-saving and cost-reducing optimal effectiveness.
Step 12, the current signal that current sensor 15 is detected on power transmission network 8 wires feed back to power electronics transformation device 7.
Step 13, the feedback current signal is carried out filtering, extract high-frequency current signal i wherein f, and it is judged and calculating.
Work as i f≤ δ fThe time, illustrating that the high-frequency alternating current that the elimination ice slush is used not yet forms the loop, forecasting system equipment may break down, execution in step 18.
Work as δ f<i fAnd i f-i 0<0 o'clock, illustrate that the high-frequency alternating current of eliminating ice slush is working properly, but its current value is on the low side, execution in step 14, regulate the output waveform of SPWM, improve duty ratio, strengthen the equivalent voltage of power electronics transformation device 7 outputs, that is the high-frequency alternating current flow valuve of the elimination ice slush in the increase three-phase loop, increase ice-melt energy and wire shock range.
Work as δ f<i fAnd i f-i 0>0 o'clock, illustrate that the high-frequency alternating current of eliminating ice slush is working properly, but its current value is higher, execution in step 16, regulate the output waveform of SPWM, reduce duty ratio, reduce the equivalent voltage of power electronics transformation device 7 outputs, that is reduce the high-frequency alternating current flow valuve of the elimination ice slush in the three-phase loop, reduce ice-melt energy and wire shock range.
The duty ratio of step 14, raising SPWM output waveform.
Step 15, i f-i 0〉=0? be execution in step two; Otherwise, return execution in step 14.
The duty ratio of step 10 six, reduction SPWM output waveform.
Step 10 seven, i f-i 0≤ 0? be execution in step two; Otherwise, return execution in step 16.
Step 10 eight, report to the police, bulletin need to place under repair and safeguards execution in step two system.
Step 10 nine, signal processor 2 be to system controller 3 and the program control instruction of remote signal sending module 5 transmitting systems elimination ice slush out of service, and return step 1, continues to monitor wire ice slush situation.
The power supply of power transmission network ice slush disaster is intermittently Intelligent preventive control System and method for embodiment confirmation not:
(1) the identification computing by signal processor has realized the intelligent surveillance function in the unattended operation situation of power transmission network ice slush situation by imageing sensor collection power transmission network image scene.
(2) system has warning, the automatic eliminating function to the power transmission network ice slush.
(3) realize in high frequency deicing electric current and the power transmission network that the 50Hz alternating current is well shunted, the complementary interference, can accomplish not affect the de-icing work under original transmission of electricity operating mode, i.e. the purpose of realization " power supply of power transmission network ice slush disaster is not intermittently " Intelligent preventive control.
(4) occur under the acting in conjunction of submodule and phase shifting control submodule at SPWM, so that the high-frequency current generation electricity that exports on the three-phase deicing circuit causes machinery concussion effect, and the cycle of frequency, duty ratio and sequencing control level signal that can be by regulating the SPWM waveform, make No. three electronic power switch major loop submodules treat each other the deicing wire to three and export best amplitude and the frequency thereof that optimum high-frequency high-power electric current, electricity cause the machinery concussion.When heat is melted, accelerate coming off of ice slush on the wire, therefore can shorten significantly the time of deicing, reach and save the optimal effectiveness that heat is melted power consumption.
Present embodiment only needs a little reconfiguration namely to eliminate applicable to the ice slush of All other routes or overhead ground wire.Such as OPGW optical cable (Optical Fiber Composite Overhead Ground Wire), also claim Optical Fiber composite overhead Ground Wire.The optical cable of this version has ground wire and the dual-use function of communicating by letter concurrently.Deicing line segment for the OPGW optical cable, as long as with it wherein ground wire upstream and downstream respectively the serial connection of the method for attachment by present embodiment high frequency choke inductor and and connect high-voltage capacitor, utilize the output of any one road high frequency deicing electric current in the power electronics transformation device, allow high frequency deicing electric current arrive at high frequency choke inductor rear end, upstream through the upstream high-voltage capacitor, arrive downstream high frequency choke inductor front end by OPGW optical cable ground wire again, get back to the high frequency earthing point of power electronics transformation device through the downstream high-voltage capacitor.Can melt with electricity at high frequency deicing electrical current heat equally and cause under the acting in conjunction of machinery concussion, so that the ice slush of OPGW optical cable surface attachment obtains fast-falling and elimination.
In non-freezing season, the upstream and downstream high-voltage capacitor among the present invention is used to harmonic wave elimination and the reactive power compensation of power transmission network by the expansion of contact connected mode and system controller control software function.

Claims (6)

1. the power supply of power transmission network ice slush disaster Intelligent preventive control system intermittently not, it is characterized in that, comprise: imageing sensor, signal processor, system controller, upstream high-tension switch cabinet, electric power step-down transformer, remote signal sending module, power electronics transformation device, power transmission network, upstream high frequency choke device group, upstream high-voltage capacitor group, downstream high frequency choke device group, remote control signal receiving module, downstream high-tension switch cabinet, downstream high-voltage capacitor group, current sensor, wherein, the output interface of imageing sensor is connected with the input interface of signal processor; The output interface of signal processor is connected with the digital input interface of system controller and remote signal sending module; The output interface of system controller is connected with the control signal input interface of upstream high-tension switch cabinet; Three input terminations, contact of first group of normal open switch in the high-tension switch cabinet of upstream are connected with power transmission network upstream three-phase end points, and three output contact terminations of first group of normal open switch in the high-tension switch cabinet of upstream are connected with the former limit three-phase input end point of electric power step-down transformer; The secondary three-phase output end point of electric power step-down transformer and neutral point are connected with the power input interface of power electronics transformation device, the current detection signal input interface of power electronics transformation device is connected with the output interface of current sensor, current sensor is arranged in any one loop of power electronics transformation device, the neutral ground of electric power step-down transformer; Three high potential exit points of power electronics transformation device output interface are connected with three input terminations, contact of the 3rd group of normal open switch in the high-tension switch cabinet of upstream, and three electronegative potential exit points of power electronics transformation device output interface altogether; Three input terminations of three high-voltage capacitors in the high-tension switch cabinet of upstream in three output contact terminations of the 3rd group of normal open switch and the upstream high-voltage capacitor group are connected; Three of three high-voltage capacitors in the high-voltage capacitor group of upstream output terminations respectively with upstream high frequency choke device group in the corresponding connection in three terminations, three high frequency choke inductor rear ends; Three pairs of terminations of three high frequency choke inductor front and back ends in the high frequency choke device group of upstream respectively corresponding with input, the three pairs of terminations of output of second group of normally closed switch in the high-tension switch cabinet of upstream and connect after, be serially connected with respectively again in the three-phase corresponding line of power transmission network upstream; The remote signal sending module is by the reception antenna transmission remote signal of transmitting antenna to remote control signal receiving module; The output interface of remote control signal receiving module is connected with the input interface of downstream high-tension switch cabinet; Three pairs of terminations of three high frequency choke inductor front and back ends in the input of first group of normally closed switch in the high-tension switch cabinet of downstream, the three pairs of terminations of output and the downstream high frequency choke device group and connect after, be serially connected with again in the three-phase corresponding line in power transmission network downstream; Three of three high-voltage capacitors in the high-voltage capacitor group of downstream input terminations respectively with downstream high frequency choke device group in the corresponding connection in three terminations of three high frequency choke inductor front ends, export the termination common grounds for three of three high-voltage capacitors in the high-voltage capacitor group of downstream.
2. the power supply of power transmission network ice slush disaster according to claim 1 Intelligent preventive control system intermittently not, it is characterized in that, described power electronics transformation device, comprise: power input interface, the first commutator module, the second commutator module, the 3rd commutator module, the first filtering submodule, the second filtering submodule, the 3rd filtering submodule, the first electronic power switch major loop submodule, the second electronic power switch major loop submodule, the 3rd electronic power switch major loop submodule, the Switching Power Supply control module, the three-phase input end head of power input interface, be connected with the secondary three-phase output end point that the three-phase four-wire system of electric power step-down transformer is exported respectively, the ground wire termination of power input interface is connected with the secondary neutral point of electric power step-down transformer; The three-phase output end head of power input interface is connected with the input termination of the first commutator module, the second commutator module, the 3rd commutator module respectively; The output termination of the first commutator module, the second commutator module, the 3rd commutator module is connected with the input termination of the first filtering submodule, the second filtering submodule, the 3rd filtering submodule respectively; The output termination of the first filtering submodule, the second filtering submodule, the 3rd filtering submodule is connected with the power input end head of the first electronic power switch major loop submodule, the second electronic power switch major loop submodule, the 3rd electronic power switch major loop submodule respectively; The output termination of the first electronic power switch major loop submodule, the second electronic power switch major loop submodule, the 3rd electronic power switch major loop submodule is inputted the termination, contact with the three-phase of the 3rd group of normal open switch in upstream respectively and is connected respectively; The control signal input termination of the first electronic power switch major loop submodule, the second electronic power switch major loop submodule, the 3rd electronic power switch major loop submodule is connected with the output port of Switching Power Supply control module respectively; The current detection signal input port of Switching Power Supply control module is connected with the output interface of current sensor; The voltage detection signal input port of Switching Power Supply control module is connected with any one voltage feedback signal output interface of first, second and third electronic power switch major loop submodule.
3. the power supply of power transmission network ice slush disaster according to claim 2 Intelligent preventive control system intermittently not, it is characterized in that, described Switching Power Supply control module comprises: high-frequency current detection signal input interface, high-frequency current filtering submodule, high-frequency current amplify submodule, high frequency voltage detection signal input interface, SPWM generation submodule, SPWM signal driver submodule, the first driver output interface, the second driver output interface, phase shifting control submodule, wherein, the input port of high-frequency current detection signal input interface is connected with the output interface of current sensor; The output port of high-frequency current detection signal input interface is connected with the input port of high-frequency current filtering submodule; The output port of high-frequency current filtering submodule is connected with the input port that high-frequency current amplifies submodule; The output port that high-frequency current amplifies submodule is connected with the current signal input port that the submodule input interface occurs SPWM; The input port of high frequency voltage detection signal input interface is connected with any one voltage feedback signal output interface of first, second and third electronic power switch major loop submodule, and the output port of high frequency voltage detection signal input interface is connected with the high frequency voltage feedback signal input port that submodule occurs SPWM; The output port that submodule occurs SPWM is connected with the input port of SPWM signal driver submodule; The input port of the output port of SPWM signal driver submodule and the first driver output interface, the second driver output interface also connects; The output port of the first driver output interface is connected with the control signal input port of the first electronic power switch major loop submodule; The output port of the second driver output interface is connected with the SPWM signal input port of phase shifting control submodule; First, second output port of phase shifting control submodule is connected with the control signal input termination of the second electronic power switch major loop submodule, the 3rd electronic power switch major loop submodule respectively, all submodules in the power electronics transformation device and are connected with electric power step-down transformer secondary neutral point altogether.
4. the power supply of power transmission network ice slush disaster according to claim 3 Intelligent preventive control system intermittently not, it is characterized in that, described phase shifting control submodule comprises: SPWM signal input port, clock frequency generator, time schedule controller, the first phase-shift circuit, the second phase-shift circuit, the first output port, the second output port, the input termination of SPWM signal input port is connected with the second driver output interface of Switching Power Supply control module, and the SPWM signal input port of the output termination of SPWM signal input port and the first phase-shift circuit, the second phase-shift circuit also connects; The output port of clock frequency generator is connected with the input port of time schedule controller; The output port of time schedule controller comprises G a, G b, G c, G dFour terminations, the corresponding clock signal output in each termination; G a, G bBe connected with first and second triggering control inputs termination of the first phase-shift circuit respectively; G c, G dBe connected with first, second triggering control inputs termination of the second phase-shift circuit respectively; The output port of the first phase-shift circuit, the second phase-shift circuit is connected with the control signal input termination of second, third electronic power switch major loop submodule respectively, the first phase-shift circuit, the second phase-shift circuit structure are identical, consist of by two groups of electronic switches, every group of electronic switch consists of by two bidirectional thyristors and a phase inverter, and each bidirectional thyristor comprises two main electrode T 1, i.e. SPWM signal input port, the T of phase-shift circuit 2With control utmost point G, namely trigger the control inputs termination, wherein, the main electrode T of two bidirectional thyristors of first group of electronic switch of the first phase-shift circuit 1And after connecing and the G of time schedule controller aThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Be connected with the first termination of the control signal input port of the second electronic power switch major loop submodule with the output termination of phase inverter and after connecing; The main electrode T of two bidirectional thyristors of second group of electronic switch of the first phase-shift circuit 1And after connecing and the G of time schedule controller bThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Inputting the termination with second of the control signal input port of the second electronic power switch major loop submodule with the output termination of phase inverter and after connecing is connected; The main electrode T of two bidirectional thyristors of first group of electronic switch of the second phase-shift circuit 1And after connecing and the G of time schedule controller cThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Be connected with the first termination of the control signal input port of the 3rd electronic power switch major loop submodule with the output termination of phase inverter and after connecing; The main electrode T of two bidirectional thyristors of second group of electronic switch of the second phase-shift circuit 1And after connecing and the G of time schedule controller dThe output termination connects the main electrode T of second bidirectional thyristor 2Be connected the main electrode T of the first bidirectional thyristor with the input termination of phase inverter 2Inputting the termination with second of the control signal input port of the 3rd electronic power switch major loop submodule with the output termination of phase inverter and after connecing is connected.
5. the power supply of power transmission network ice slush disaster Intelligent preventive control method intermittently not, in advance with behind the detected wire in the image sensor alignment power transmission network scene, concrete steps are as follows:
Step 1, system initialization:
To the set accumulative total variable N of signal processor sending controling instruction number of times, initial assignment is zero, i.e. N=0;
Step 2, imageing sensor Real-time Collection power transmission network image scene;
Step 3, signal processor carry out the gray scale intensive treatment to the power transmission network image scene that receives, and pre-determined power transmission line zone is intercepted;
Step 4, to by the intercepting image-region carry out rim detection and binaryzation;
Step 5, calculate the size of current boundary line " diameter " D of transmission pressure according to edge detection results, and its " diameter " d with normal power transmission network wire is compared;
When D-d 〉=δ, assert that there is ice slush in current power transmission network wire and must be eliminated the accumulative total variable
Figure FDA00001929295900041
And execution in step six;
When D-d<δ, if N=0, then step 2 is got back to by system, continues to be monitored; Otherwise, i.e. N ≠ 0, execution in step 19;
Wherein, δ is the decision threshold of determining through experiment in advance;
Step 6, signal processor are to system controller and remote signal sending module transmitting system deicing control command;
The digital control instruction that step 7, remote signal sending module will receive is carried out Digital Modulation by the modulation submodule to carrier signal, high-frequency signal after the modulation is delivered to transmitting antenna and is outwards launched Digital Modulation control command signal after carrying out power amplification through the power amplification submodule;
Step 8, remote control signal receiving module receive the Digital Modulation control command signal that the remote signal sending module is launched by reception antenna, modulation signal is carried out demodulation, digital-to-analogue conversion and power amplification successively, then drive the downstream high-tension switch cabinet, the control law that allows the downstream high-tension switch cabinet arrange according to instruction is implemented control to the switch contact in power transmission network downstream;
First group of normally closed switch contact of step 9, downstream high-tension switch cabinet disconnects, make three high frequency choke inductors in the high frequency choke device group of downstream in the triple line of power transmission line downstream, be in respectively the serial connection state, by high-frequency current the high impedance of downstream high frequency choke device group has been isolated the high-frequency current of power electronics transformation device output to " extension " in power transmission network downstream; Second group of normal open switch closing of contact of downstream high-tension switch cabinet, three high-voltage capacitors in the high-voltage capacitor group of downstream and earth point are connected, so that the high-frequency current of power electronics transformation device output can pass through the earth terminal that the power electronics transformation device is got back in power transmission network downstream, downstream high-voltage capacitor group, earth point, form a kind of high-frequency current loop; At this moment, high pressure 50Hz alternating current has been avoided shorted to earth by the high capacitive reactance of downstream high-voltage capacitor group;
Step 10, system controller drive upstream high-tension switch cabinet startup controlled plant and enter the deicing operating mode, be that electric power step-down transformer, power electronics transformation device are in running order synchronously, the electric power step-down transformer is subjected to the control realization of the first group of normal open switch in upstream and being communicated with of power transmission network, three high frequency choke inductors in the high frequency choke device group of upstream are entered in the upstream three-phase line of power transmission network by serial connection respectively by the control of the second group of normally closed switch in upstream, play the effect of the large electric current of isolation high frequency, namely do not cause high frequency deicing electric current " to pour in down a chimney " the electrical network upstream; Three high-voltage capacitors in the high-voltage capacitor group of upstream are communicated with the corresponding termination of power electronics transformation device output interface respectively by the control of the 3rd group of normal open switch in upstream, upstream high-voltage capacitor group not only can play the effect of isolation 50Hz High Level AC Voltage, but also be the high frequency deicing electric current and the interface channel of power transmission network upstream of power electronics transformation device output, not only guaranteed the unimpeded of high frequency deicing electric current but also intercepted 50Hz High Level AC Voltage " falling to rush ";
Step 11, a power electronics transformation device output minute three-phase independent loop carries out work, and namely the U of power transmission network, V, W three-phase are passed into respectively the three road mutual phase places that are subjected to SPWM control according to the high frequency deicing current signal of predetermined rule, the conversion of taking turns;
Step 12, the current signal that current sensor is detected on the power transmission network wire feed back to the power electronics transformation device;
Step 13, the feedback current signal is carried out filtering, extract high-frequency current signal i wherein f, and it is judged and calculating;
Work as i f≤ δ fThe time, illustrating that the high-frequency alternating current that the elimination ice slush is used not yet forms the loop, forecasting system equipment may break down, execution in step 18, wherein, δ fEliminate the decision threshold whether the ice slush high-frequency alternating current works for judging, concrete value is determined by experiment;
Work as δ f<i fAnd i f-i 0<0 o'clock, illustrate that the high-frequency alternating current of eliminating ice slush is working properly, but its current value is on the low side, execution in step 14, regulate the output waveform of SPWM, improve duty ratio, strengthen the equivalent voltage of power electronics transformation device output, that is the high-frequency alternating current flow valuve of the elimination ice slush in the increase three-phase loop, increase ice-melt energy and wire shock range; Wherein, i 0For eliminating the high-frequency ac current set point of ice slush, its size is determined by experiment;
Work as δ f<i fAnd i f-i 0>0 o'clock, illustrate that the high-frequency alternating current of eliminating ice slush is working properly, but its current value is higher, execution in step 16, regulate the output waveform of SPWM, reduce duty ratio, reduce the equivalent voltage of power electronics transformation device output, that is reduce the high-frequency alternating current flow valuve of the elimination ice slush in the three-phase loop, reduce ice-melt energy and wire shock range;
The duty ratio of step 14, raising SPWM output waveform;
Step 15, i f-i 0〉=0? be execution in step two; Otherwise, return step 14;
The duty ratio of step 10 six, reduction SPWM output waveform;
Step 10 seven, i f-i 0≤ 0? be execution in step two; Otherwise, return step 10 six;
Step 10 eight, report to the police, bulletin need to place under repair and safeguards system, then continues execution in step two;
Step 10 nine, signal processor (2) be to system controller (3) and the program control instruction of remote signal sending module (5) transmitting system elimination ice slush out of service, and return step 1, continues to monitor wire ice slush situation.
6. the power supply of power transmission network ice slush disaster according to claim 5 Intelligent preventive control method intermittently not, it is characterized in that, when described step 11 passes into respectively three road high frequency deicing current signal by SPWM control when the power electronics transformation device to U, V, the W three-phase of power transmission network, wherein, the time schedule controller output port G of phase shifting control submodule a, G b, G c, G dCorresponding clock signal can be expressed as:
U Ga ( t ) = 1 ( A ) ; nT &le; t T < ( 2 n + 1 ) T 2 , n = 0,1,2 , . . . , &infin; 0 ( B ) ; ( 2 n + 1 ) T 2 &le; t T < ( n + 1 ) T , n = 0,1,2 , . . . , &infin;
U Ga ( t ) = 1 ( A ) ; ( 2 n + 1 ) T 2 &le; t T < ( n + 1 ) T , n = 0,1,2 , . . . , &infin; 0 ( B ) ; nT &le; t T < ( 2 n + 1 ) T 2 , n = 0,1,2 , . . . , &infin;
U Ga ( t ) = 1 ( A ) ; ( 4 n - 1 ) T 4 &le; t T < ( 4 n + 1 ) T 4 , n = 0,1,2 , . . . , &infin; 0 ( B ) ; ( 4 n + 1 ) T 4 &le; t T < ( 4 n + 3 ) T 4 , n = 0,1,2 , . . . , &infin;
With
U Ga ( t ) = 1 ( A ) ; ( 4 n + 1 ) T 4 &le; t T < ( 4 n + 3 ) T 4 , n = 0,1,2 , . . . , &infin; 0 ( B ) ; ( 4 n - 1 ) T 4 &le; t T < ( 4 n + 1 ) T 4 , n = 0,1,2 , . . . , &infin;
Wherein, 1 (A) is illustrated under the effect of conducting control signal level value A, and the electronic power switch device is output as height
Level signal; 0 (B) is illustrated under the effect of turn-offing control signal level value B, and the electronic power switch device is output as
Low level signal;
Occur at SPWM to have formed on U, V, the W three-phase deicing circuit and three pairs of three road high frequency deicing current signals that SPWM upper arm control signal phase place is corresponding, that is: under the acting in conjunction of submodule and phase shifting control submodule
Figure FDA00001929295900071
Under the interaction of three road high frequency deicing current signal phase differences, three line conductors be the generating period variation attract each other or repel, can when melting, impel large electrical current heat the fragmentation of ice slush on the wire, therefore the deicing time can be shortened significantly, finally reach deicing and energy-saving and cost-reducing optimal effectiveness, wherein: I mBe the high-frequency current amplitude; ω is the angular frequency of high frequency deicing electric current;
Figure FDA00001929295900072
Initial phase for high frequency deicing electric current; T is time variable; T is the sequence switch control signal cycle.
CN 201110060883 2011-03-14 2011-03-14 Intelligent prevention and control system and method for continuously supplying power in power transmission network ice disaster Expired - Fee Related CN102163828B (en)

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CN104716941A (en) * 2013-12-13 2015-06-17 上海普锐马电子有限公司 High-frequency and high-voltage electronic switch with programmable control over conduction time
CN104655030B (en) * 2015-02-16 2017-08-11 国网安徽省电力公司铜陵供电公司 A kind of powerline ice-covering detection and prior-warning device
CN106546511B (en) * 2016-11-25 2022-04-05 国网河南省电力公司漯河供电公司 Hydrophobicity detection method for vulcanized silicone rubber coating of power transmission line
CN107482530A (en) * 2017-09-20 2017-12-15 湖南省湘电试研技术有限公司 Based on the Portable rural distribution exchange de-icing method and device for handing over orthogonal Two Stages
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CN113507086B (en) * 2021-07-14 2022-06-21 四川大学 Passive lossless three-phase anti-icing and de-icing control equipment for strain tower

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