CN104269859A - Compensation device for distributed series capacitor - Google Patents
Compensation device for distributed series capacitor Download PDFInfo
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- CN104269859A CN104269859A CN201410502676.0A CN201410502676A CN104269859A CN 104269859 A CN104269859 A CN 104269859A CN 201410502676 A CN201410502676 A CN 201410502676A CN 104269859 A CN104269859 A CN 104269859A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 124
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- 238000006243 chemical reaction Methods 0.000 claims description 16
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- 230000008859 change Effects 0.000 claims description 10
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- 238000001816 cooling Methods 0.000 claims description 5
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
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- H02J13/0017—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
Abstract
The invention provides a compensation device for a distributed series capacitor. The primary part of the compensation device comprises a bypass breaker, the series capacitor and a thyristor damping branch, wherein the bypass breaker, the series capacitor and the thyristor damping branch are connected in parallel. The thyristor damping branch comprises a thyristor and a damping device which are connected in series. A control and protection system of the compensation device comprises a control module, a protection module and a communication module. The compensation device is provided with few sub equipment, the weight and cost of the whole device are controlled efficiently, and main wiring of the compensation device is greatly simplified on the premise of reducing the cost of a whole set of series compensation device, so that the reliability of the whole compensation device is improved.
Description
Technical field
The present invention relates to a kind of device of series capacitor compensation technical field, specifically relate to a kind of distributed serial power capacitor reactive compensation installation.
Background technology
Survey of Flexible AC Transmission System (flexible alternative current transmission systems, FACTS) implements a kind of UHV AC transmission technique of flexible quick adjustment based on power electronic technology and control technology to the impedance, voltage, phase place, power etc. of AC transmission system; Can be used for controlling flexibly the meritorious of system and reactive power flow, improve circuit conveying capacity, damping system vibration to reach, improve system stability level, improve the quality of power supply, improve the objects such as reliability.FACTS technology changes the concept of conventional AC transmission of electricity, makes modern electric power system there occurs great change.
Large-scale FACTS apparatus function is powerful, complex structure; floor space is larger; one-time investment cost is huge; require also higher to the professional and technical personnel participating in daily operation management and Maintenance and Repair, and the reliability of Control protection system, power electronic device and cooling system etc. and requirement also some gap of power grid operation company in FACTS device.For above-mentioned objective circumstances, the people such as Divan professor Deepak of the georgia ,u.s.a Institute of Technology propose distributed-intelligence ac transmission (Distributed FACTS, D-FACTS) concept the earliest.D-FACTS core is the distributed serial compensator of low capacity, i.e. distributed FACTS controller (Distributed FACTS Controller, DFC).As shown in Figure 1, Fig. 1 is the installation site schematic diagram of DFC, by being articulated on power transmission line by a large amount of DFC distribution, being usually located at the both sides of shaft tower, can reaching following effect:
(1) equivalent inductance of adjusting circuit, control section trend, congested to alleviate, restriction circulation, increases power transmission capacity etc.;
(2) sub-synchronous oscillation is suppressed;
(3) equivalent inductance of compensated line, improves by the conveying capacity of compensated line;
(4) equivalent inductance of compensated line, adjusts by the voltage of compensated line.
D-FACTS mainly comprises distributed serial impedance (Distributed Series Impedance, DSI), distributed serial reactance (Distributed Series Reactor, DSR), distributed static series compensator (Distributed Static Series Compensator, and Distributed Power Flow controller (Distributed Power Flow Controller, DPFC) DSSC).That in DFC, function is the strongest is DSSC, and the most succinctly and that be applied in actual electric network is DSR, for identical weight limits, DSR capacity should be maximum to structure.
As shown in Figure 2,3, Fig. 2,3 is respectively the main circuit structure embodiment schematic diagram of DSR and the main circuit structure embodiment schematic diagram of DSSC, adopt the DFC of single-turn transformer (Single Turn Transformer, STT) without the need to disconnecting the power transmission lines that will mount.The cylindric iron core of single-turn transformer is made up of two parts, transmission line can be put into iron core ring, and then be fastened togather, form complete magnetic circuit, adopt the DFC of single-turn transformer to install very convenient and simple, do not account for floor area, it also avoid the problem that High-Voltage Insulation brings; Meanwhile, DFC can according to electrical network demand making and installation by stages, investment diversification, and can realize adjustment installation circuit flexibly.The series compensation degree of place circuit and the control strategy of DFC is changed, to meet the demand of power system network, intelligent development by control centre.
Adopt the maximum feature of DFC of single-turn transformer to be exactly do not need to disconnect power transmission line, be directly articulated on power transmission line.And the electric force pole tower of low-voltage network is comparatively thin, power transmission line is also relatively thin, additionally should not mount relevant device again on power transmission line.According to the technology maturity of present stage, for the compensation capacity value of custom requirements, be difficult to the Weight control of DFC within 10kg, therefore, DFC directly should not be articulated on the power transmission line of power distribution network, outdoor breaker mount scheme on post can be adopted.On employing post after mount scheme, can not single-turn transformer be needed, require also can slightly relax to the Weight control of DFC simultaneously.
Serial connection capacitor compensating device is series in transmission line of alternation current by capacitor, for compensating the part emotional resistance of transmission line of alternation current, thus reaches the transmission capacity increasing circuit, the object such as stability, investment reduction improving system.In remote, large capacity transmission system, along with the increase of transmission distance, the conveying capacity of transmission line is subject to increasing restriction.Serial connection capacitor compensating device solves this problem, improves one of important means of transmission line conveying capacity.
Before the eighties in 20th century, most of fixed series compensation does not have metal oxide pressure-limiting device, only limits the overvoltage of series capacitor with spark gap.During external area error, only can affect heavily throwing fast of series capacitor with the main circuit structure of spark gap, this is very disadvantageous to the transient stability of raising electric power system.
Since the eighties in 20th century, introduce metal oxide pressure-limiting device, the problem that when solving external area error, series capacitor is heavily thrown fast.The typical main circuit structure of superhigh pressure, system for ultra-high voltage transmission fixed series compensation as shown in Figure 4, comprises bypass isolating switch 1, series connection isolating switch 2, earthed switch 3, series capacitor 4, metal oxide pressure-limiting device 5, damping device 6, spark gap 7, bypass breaker 8.Wherein, there is interlocked relationship in series connection isolating switch 2 and earthed switch 3.
In power distribution network, adopt serial connection capacitor compensating device, be mainly used in the perceptual pressure drop of compensated line, improve quality of voltage.As, the radius of electricity supply of 10kV, usually within 10 kilometers, is generally no more than 15 kilometers.The modular design of transformer station should be able to guarantee that most of load can meet above-mentioned requirements, but the supply line sometimes also having indivedual 10kV can more than 15 kilometers.For the 10kV distribution line ubiquity voltage problem more than 15 kilometers, quality of voltage can be improved with serial connection capacitor compensating device.
At power distribution network application distribution serial connection capacitor compensating device, more harsh requirement is proposed to the performance of device, weight and economy.Obviously, the typical main circuit structure of superhigh pressure as shown in Figure 4, ultra high voltage fixed series compensation can not apply as the main circuit structure of distributed serial power capacitor reactive compensation installation.How according to the Liquified gas tanker of distributed serial power capacitor reactive compensation installation, study and propose to be suitable for power distribution network, structure more simplifies, performance better distributed serial power capacitor reactive compensation installation main circuit structure is present urgent problem.
Therefore, need to provide a kind of distributed serial power capacitor reactive compensation installation.
Summary of the invention
For overcoming above-mentioned the deficiencies in the prior art, the invention provides a kind of distributed serial power capacitor reactive compensation installation.
Realizing the solution that above-mentioned purpose adopts is:
A kind of distributed serial power capacitor reactive compensation installation, its improvements are: a second part of described device comprises bypass breaker in parallel, series capacitor and thyristor damping branch road; Described thyristor damping branch road comprises thyristor and the damping device of series connection;
The Control protection system of described device comprises control module, protection module and communication module.
Further, described bypass breaker adopts air circuit or air switch;
Described bypass breaker is the normally closed circuit breaker with short circuit current making capability.
Further, described thyristor is anti-parallel thyristor or bidirectional thyristor;
Described thyristor adopts compression joint type thyristor, welded type thyristor or bolt type thyristor;
Described thyristor adopts from the type of cooling.
Further, described damping device adopts quality factor to be less than the damping reactor of 30 or the circuit of damped resistor and damping reactor parallel connection.
Further, described device comprises input state and exit status;
When described bypass breaker disconnect and described thyristor locking time, described device is described input state;
When the closed and described thyristor locking of described bypass breaker, described device is described exit status.
Further, described device passage divides cooperation State Transferring mode and full mated condition conversion regime to carry out State Transferring.
Further, the method being transformed into described input state by described exit status in described part mated condition conversion regime is: disconnect described bypass breaker;
Be thyristor described in conducting by described input State Transferring to the method for described exit status in described part mated condition conversion regime, closed described bypass breaker, thyristor described in locking.
Further, the method being transformed into described input state by described exit status in described full mated condition conversion regime is: the triggering signal sending described thyristor, disconnect described bypass breaker, and delay scheduled time guarantees that line current is from the described bypass breaker change of current to described thyristor, then the triggering signal of thyristor described in locking.
Be thyristor described in conducting by described input State Transferring to the method for described exit status in described full mated condition conversion regime, closed described bypass breaker, thyristor described in locking.
Further, described device series current instrument transformer;
Described series capacitor shunt capacitance voltage measurement circuit.
Further, described capacitance voltage measuring circuit is voltage transformer or resitstance voltage divider.
Further, judge that power distribution network is short-circuited fault by described current transformer measured value, make described turn on thyristors in order to protect described series capacitor, described bypass breaker closes a floodgate to protect described thyristor subsequently.
Further, determined the capacitance of described series capacitor by the measured value of described current transformer and the measured value of described capacitance voltage measuring circuit, and judged the damaged condition of capacitor element in described series capacitor by the change of described series capacitor capacitance.
Further, when described serial connection capacitor compensating device is input state, when the ratio of capacitance voltage value is less than or equal to 90% corresponding to described capacitance voltage measured value and line current measured value, then judge that thyristor is short-circuited damage.
Further, described device by described input State Transferring in the process of described exit status, have in the 20-100ms time, if the voltage measuring value of the capacitance voltage value corresponding to line current measured value and described series capacitor is unequal, then judge that turn on thyristors works, namely not there is open circuit breakage in thyristor;
If the capacitance voltage value corresponding to line current measured value is equal with the voltage measuring value of described series capacitor, then judge the non-conducting of thyristor, i.e. thyristor generation open circuit breakage.
Further, described control module communicates with described communication module respectively with described protection module;
Described control module for sending bypass breaker and thyristor separately and closed operation signal, monitoring overvoltage and overcurrent operating mode, and performs protection act, avoids described distributed serial power capacitor reactive compensation installation to damage;
Described control module controls the State Transferring of described distributed serial power capacitor reactive compensation installation according to the method that the conversion of part mated condition or full mated condition are changed;
Described protection module be used for when transmission line is short-circuited fault, rapid closing or keep bypass breaker close a floodgate and turn on thyristors until failure vanishes;
Described communication module, for receiving control command or definite value arranges instruction, completes the operation of described Control protection system, and receives the information of described control module and described protection module, feed back the state information of described distributed serial power capacitor reactive compensation installation.
Further, described communication module adopts general packet radio service technology, G mobile communication or forth generation mobile communication technology to carry out communication.
Further, described Control protection system is furnished with that get can circuit, described in get can circuit adopt voltage get can, current energy-taking or electric current and voltage hybrid mode carry out getting energy.
Compared with prior art, the present invention has following beneficial effect:
1, adopt thyristor in device provided by the invention, the metal oxide pressure-limiting device thyristor that compared to existing technology, volume is relatively large is smaller and more exquisite, is conducive to the rational deployment of device, reduces erection space.
2, the thyristor adopted in device provided by the invention carries out corresponding information exchange by optical fiber to controller, is easier to detect, and metal oxide pressure-limiting device used in the prior art damages, then need comparatively complicated instrument and mode to check.
3, after indivedual valve block damages in the metal oxide pressure-limiting device adopted in prior art, only change indivedual valve block, be difficult to obtain consistent nonlinear wind vibration, usually can only change whole metal oxide pressure-limiting device, cost is relatively high; And when the indivedual thyristors in the thyristor valve in this device damage, only replace the thyristor damaged, cost is low, easy to maintenance.
4, from control system, thyristor protection detects that turn on thyristors is not more than 100us substantially operate time, response speed quickly, close to the response speed of metal oxide pressure-limiting device.
5, the subset adopted in device provided by the invention is less, controls weight and the cost of whole device efficiently; Under the prerequisite reducing the cost that a whole set of string is mended, wiring also greatly simplifies, and improves the reliability of whole device.
6, the subset adopted in device provided by the invention is less, and therefore, Control protection system is also relatively simple to functions such as each subset manipulations, thus improves the reliability of Control protection system;
7, Control protection system provided by the present invention is furnished with that get can circuit, enables Control protection system obtain electric energy on the spot, adapts to distributed practical application operating mode;
8, Control protection system provided by the present invention adopts wireless communication technology, takes full advantage of public communication resources, achieves the wireless distant place of device and controls and monitoring, save the cost of communication control aspect.
Accompanying drawing explanation
Fig. 1 is the installation site schematic diagram of DFC;
Fig. 2 is the main circuit structure embodiment schematic diagram of DSR;
Fig. 3 is the main circuit structure embodiment schematic diagram of DSSC;
Fig. 4 is the typical main circuit structure figure of super ultra high voltage fixed series compensation;
Fig. 5 is the main circuit structure schematic diagram of distributed serial power capacitor reactive compensation installation in the present invention;
Fig. 6 is main circuit structure scheme one schematic diagram of distributed serial power capacitor reactive compensation installation in the present embodiment;
Fig. 7 is main circuit structure scheme two schematic diagram of distributed serial power capacitor reactive compensation installation in the present embodiment;
Reference numeral: 1-bypass isolating switch, 2-connects isolating switch, 3-earthed switch, 4-series capacitor, 5-metal oxide pressure-limiting device, 6-damping device, 7-spark gap, 8-bypass breaker, the normally closed bypass breaker of 9-, 10-series capacitor, 11-thyristor, 12-damping device, 13-damping reactor, 14-current transformer, 15-capacitance voltage measuring circuit.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
As shown in Figure 5, Fig. 5 is the main circuit structure schematic diagram of distributed serial power capacitor reactive compensation installation in the present invention; One second part of distributed serial power capacitor reactive compensation installation provided by the invention comprises normally closed bypass breaker 9, series capacitor 10, thyristor 11, damping device 12.
Thyristor 11 and damping device 12 are connected, and the thyristor 11 of series connection and damping device 12, bypass breaker 9, series capacitor 10 are in parallel.
Normally closed bypass breaker 9 can select air circuit, also can select air switch etc.Following requirement need be met:
1, the corresponding load current of power distribution network place circuit can be cut-off;
2, the corresponding short circuit current of power distribution network place circuit can be born;
3, the corresponding short circuit current making capability of power distribution network place circuit should be had;
4, the connecting-disconnecting function of the corresponding short circuit current of power distribution network place circuit can not be had.If the line-breaker of distributed serial power capacitor reactive compensation installation place circuit is responsible for cut-offfing short circuit current, normally closed bypass breaker 9 can not possess short circuit current connecting-disconnecting function.
Series capacitor 10, for the equivalent inductance of compensated line, plays effects such as improving quality of voltage.
Thyristor 11, for quick bypass series capacitor 10.Thyristor is antiparallel thyristor or bidirectional thyristor, can select compression joint type (flat) thyristor, welded type thyristor or bolt type thyristor.Thyristor 11 can adopt from the type of cooling.
Damping device 12, for limiting discharge frequency and the electric discharge amplitude of series capacitor 10.Damping device 12 can be the damping reactor of a low-quality factor (quality factor are less than 30), or the circuit of a damped resistor and damping reactor parallel connection.For reducing the complexity of distributed serial power capacitor reactive compensation installation main circuit structure, the switch element such as gap or metal oxide pressure-limiting device no longer introduced by damped resistor.
Distributed serial power capacitor reactive compensation installation of the present invention comprises input state and exit status; Coordinated by normally closed bypass breaker 9 and thyristor 11 action and realize.
Input state: normally closed bypass breaker 9 disconnects, thyristor 11 locking;
Exit status: normally closed bypass breaker 9 closes, thyristor 11 locking.
Distributed serial power capacitor reactive compensation installation passage divides cooperation State Transferring mode and full mated condition conversion regime to carry out State Transferring.
1., part mated condition conversion regime comprises following situation:
The method being transformed into described input state by described exit status is: disconnect described normally closed bypass breaker 9;
Be thyristor 11 described in conducting by described input State Transferring to the method for described exit status, closed normally closed bypass breaker 9, thyristor 11 described in locking.
2., full mated condition conversion regime comprises following situation:
The method being transformed into described input state by described exit status is: send described thyristor 11 triggering signal, disconnect described normally closed bypass breaker 9 delay scheduled time and guarantee that line current is from the change of current of described normally closed bypass breaker 9 to described thyristor 11, then the triggering signal of thyristor 11 described in locking.
Be thyristor 11 described in conducting by described input State Transferring to the method for described exit status, closed described normally closed bypass breaker 9, thyristor 11 described in locking.
In above-mentioned two kinds of conversion regimes, thyristor 11 is only for the State Transferring of auxiliary separating cloth serial connection capacitor compensating device, the time of thyristor 11 constant conduction is shorter, therefore, thyristor 11 can adopt self cooled radiating mode, compared with water-cooled, the mode such as air-cooled, adopt from cooling relatively simple and reliable.
When transmission line does not have electric current or current ratio is less, normally closed mechanical type bypass breaker 9 is in "on" position, guarantees the safety of series capacitor.After transmission line choke reaches analog value, can series capacitor be dropped into, play compensating action.As now electrical network is short-circuited fault, flow through with regard to having larger short circuit current.The closing time of normally closed bypass breaker 9 is relatively long, needs thyristor 11 fast conducting, bypass short circuit current, thus the safety guaranteeing series capacitor, therefore, thyristor 3 is indispensable.
Present invention also offers thyristor 11 Failure analysis method.Thyristor damages can be divided into two states usually, and one is short circuit, when compression joint type thyristor damages, and normally short circuit; Two is open circuits, when welded type thyristor damages, normally opens a way.
Failure analysis method concrete condition is as follows:
When normally closed bypass breaker 9 separating brake, line current flows through distributed serial power capacitor reactive compensation installation, if now series capacitor 10 is still by thyristor 11 short circuit, then can judge that thyristor 11 has been short-circuited damage.
Distributed serial power capacitor reactive compensation installation is by dropping into State Transferring in exit status process, have in a bit of time (between 20-100ms), corresponding line current measured value is not as obtained corresponding capacitance voltage, but smaller capacitance voltage, then can judge that thyristor 11 conducting is worked, open circuit breakage not occur; Corresponding line current measured value is as obtained the capacitance voltage corresponding to series capacitor capacitor's capacity, instead of smaller capacitance voltage, then can judge that storage thyristor 11 does not have conducting, and may be there occurs open circuit breakage.
Needing at 2 of explanation is: 1, above-mentioned corresponding capacitance voltage value is in error range; That is, if the capacitance voltage ratio that the corresponding capacitance voltage of line current measured value accounts for corresponding to series capacitor capacitor's capacity is less than or equal to 90%, then think that the capacitance voltage corresponding to line current is smaller capacitance voltage.Concrete error range can be determined according to actual conditions.
Such as: desirable corresponding capacitance voltage is 10V, and the capacitance voltage recorded is 9.8V, then think that the voltage of 9.8V is correct capacitance voltage value equally.
2, above-mentioned generation open circuit breakage is the one of failure condition, also may be other faults, therefore, in actual applications, when judge thyristor be short-circuited damage after, environment etc. need be combined further inspection is done to thyristor.
Present invention also offers a kind of distributed serial power capacitor reactive compensation installation and Control protection system thereof.
As shown in Figure 6, Fig. 6 is main circuit structure scheme one schematic diagram of distributed serial power capacitor reactive compensation installation in the present embodiment; Device also comprises current transformer, controls to comprise system and comprises control module, protection module, communication module and get energy circuit.Control module all communicates with communication module with protection module.
Control module, for doing bypass breaker and thyristor separately and closed procedure, monitoring overvoltage and overcurrent operating mode, and perform protection act, avoiding device damages;
The State Transferring of control module according to part cooperation or the State Transferring of the full State Transferring policy control circuit realiration distributed serial power capacitor reactive compensation installation coordinated.
Protection module, for when transmission line is short-circuited fault, rapid closing or keep bypass breaker close a floodgate and turn on thyristors until failure vanishes.
Communication module, the instruction such as to arrange for receiving control command or definite value, having coordinated the operation of Control protection system, and having received the information of control module and protection module, having fed back the oneself state information of described distributed serial power capacitor reactive compensation installation.In practical application, device possibility long time no operations, patrols and examines with acknowledgement mechanism by timing to show that whether operating state is normal.
Communication module is not absolutely necessary, and device can adopt and itself measure the measuring amount obtained, and according to being solidificated in the relatively simple control strategy of device inside, when not having PERCOM peripheral communication, automatically completes the controls such as the switching of series capacitor.Communication module can adopt general packet radio service technology (General Packet Radio Service, GPRS), the third generation (3g) mobile communication technology or forth generation (4g) mobile communication technology to carry out communication.
Control protection system can realize with the circuit board of one piece of band programmable logic chip (as complex programmable logic device (CPLD) or on-site programmable gate array FPGA).
What described Control protection system was furnished with get can circuit adopt voltage get can, current energy-taking or electric current and voltage hybrid mode carry out getting energy.
Get and can get corresponding energy from the line current of transmission line and series capacitor voltage by circuit, but when normally closed bypass breaker 9 closes a floodgate, even if transmission line has corresponding electric current, series capacitor does not still have corresponding voltage, also be simplified design, the weight reducing whole device simultaneously, do not select electric current and voltage to mix and get energy scheme.Therefore, the current energy-taking that energy circuit prior adopts transmission line is got.
When transmission line does not have electric current or electric current relatively little; get and can get less than enough energy by circuit; control module, protection module and communication module all cisco unity malfunctions, normally closed bypass breaker 9 is in "on" position, guarantees the safety of series capacitor 10 and thyristor 11 etc.After the line current of transmission line reaches respective doors threshold value, get and can provide enough energy to control module, protection module and communication module by circuit.Control module, protection module and communication module can carry out the switching action of series capacitor according to the operating mode of the situation of equipment of itself and transmission line.
As shown in Figure 6, serial connection capacitor compensating device is connected a current transformer; Judge that power distribution network is short-circuited fault by described current transformer measured value, make described turn on thyristors in order to protect described series capacitor, described bypass breaker closes a floodgate to protect described thyristor subsequently.
In another embodiment, also at series capacitor side series current instrument transformer, thus can measure the electric current of transmission line and the electric current of series capacitor simultaneously.By the electric current correlation of transmission line choke and series capacitor, can judge whether series capacitor drops into and bypass breaker 9 and thyristor 11 whether fault.
As shown in Figure 7, Fig. 7 is the schematic diagram of the main circuit structure embodiment two of distributed serial power capacitor reactive compensation installation.Capacitance voltage measuring circuit 15 is the increase in from maximum different of scheme one.
Capacitance voltage measuring circuit can have two kinds of methods, and one is adopt voltage transformer, and two is adopt resitstance voltage divider.Voltage transformer and resitstance voltage divider doublely can do capacitor discharge circuit, and from this angle, both is identical.Consider that voltage transformer also has electrical isolation effect, and resitstance voltage divider does not have electrical isolation effect, therefore, under normal circumstances, should preferred voltage instrument transformer scheme.
Current transformer 14 flows into the electric current of serial connection capacitor compensating device for measuring, for the realization of various control and protection strategy provides corresponding input variable.Utilize the measurement result of current transformer 14 and capacitance voltage measuring circuit 15, the capacitor's capacity of series capacitor 10 can be estimated, and can go according to the change of series capacitor 10 capacitance the running status assessing series capacitor 10, namely whether there is capacitor element to damage.Capacitor unit comprises multiple capacitor element, and damaged condition represents that the capacitor element damaged in capacitor unit accounts for the percentage of described series capacitor parts number.
Such as, a capacitor unit comprises 100 capacitor elements, if damage a capacitor element, then thinks that damaged condition is one of percentage, if damage ten, then thinks that damaged condition is 10.
In addition owing to adding the amount of information of capacitance voltage, Control protection system can detect over-voltage and over-current operating mode simultaneously, perform normally closed bypass breaker 9 and thyristor 11 separately and closed procedure, and perform corresponding protection act, avoiding device damages.
Finally should be noted that: above embodiment is only for illustration of the technical scheme of the application but not the restriction to its protection range; although with reference to above-described embodiment to present application has been detailed description; those of ordinary skill in the field are to be understood that: those skilled in the art still can carry out all changes, amendment or equivalent replacement to the embodiment of application after reading the application; but these change, revise or be equal to replacement, all applying within the claims awaited the reply.
Claims (17)
1. a distributed serial power capacitor reactive compensation installation, is characterized in that: a second part of described device comprises bypass breaker in parallel, series capacitor and thyristor damping branch road; Described thyristor damping branch road comprises thyristor and the damping device of series connection;
The Control protection system of described device comprises control module, protection module and communication module.
2. a kind of distributed serial power capacitor reactive compensation installation as claimed in claim 1, is characterized in that: described bypass breaker adopts air circuit or air switch;
Described bypass breaker is the normally closed circuit breaker with short circuit current making capability.
3. a kind of distributed serial power capacitor reactive compensation installation as claimed in claim 1, is characterized in that: described thyristor is anti-parallel thyristor or bidirectional thyristor;
Described thyristor adopts compression joint type thyristor, welded type thyristor or bolt type thyristor;
Described thyristor adopts from the type of cooling.
4. a kind of distributed serial power capacitor reactive compensation installation as claimed in claim 1, is characterized in that: described damping device adopts quality factor to be less than the damping reactor of 30 or the circuit of damped resistor and damping reactor parallel connection.
5. a kind of distributed serial power capacitor reactive compensation installation as claimed in claim 1, is characterized in that: described device comprises input state and exit status;
When described bypass breaker disconnect and described thyristor locking time, described device is described input state;
When the closed and described thyristor locking of described bypass breaker, described device is described exit status.
6. a kind of distributed serial power capacitor reactive compensation installation as claimed in claim 5, is characterized in that: described device passage divides cooperation State Transferring mode and full mated condition conversion regime to carry out State Transferring.
7. a kind of distributed serial power capacitor reactive compensation installation as claimed in claim 1, is characterized in that: the method being transformed into described input state by described exit status in described part mated condition conversion regime is: disconnect described bypass breaker;
Be thyristor described in conducting by described input State Transferring to the method for described exit status in described part mated condition conversion regime, closed described bypass breaker, thyristor described in locking.
8. a kind of distributed serial power capacitor reactive compensation installation as claimed in claim 1, it is characterized in that: the method being transformed into described input state by described exit status in described full mated condition conversion regime is: the triggering signal sending described thyristor, disconnect described bypass breaker, and delay scheduled time guarantees that line current is from the described bypass breaker change of current to described thyristor, then the triggering signal of thyristor described in locking.
Be thyristor described in conducting by described input State Transferring to the method for described exit status in described full mated condition conversion regime, closed described bypass breaker, thyristor described in locking.
9. a kind of distributed serial power capacitor reactive compensation installation as claimed in claim 1, is characterized in that: described device series current instrument transformer;
Described series capacitor shunt capacitance voltage measurement circuit.
10. a kind of distributed serial power capacitor reactive compensation installation as claimed in claim 9, is characterized in that: described capacitance voltage measuring circuit is voltage transformer or resitstance voltage divider.
11. a kind of distributed serial power capacitor reactive compensation installations as claimed in claim 10; it is characterized in that: judge that power distribution network is short-circuited fault by described current transformer measured value; make described turn on thyristors in order to protect described series capacitor, described bypass breaker closes a floodgate to protect described thyristor subsequently.
12. a kind of distributed serial power capacitor reactive compensation installations as claimed in claim 11, it is characterized in that: the capacitance being determined described series capacitor by the measured value of described current transformer and the measured value of described capacitance voltage measuring circuit, and judged the damaged condition of capacitor element in described series capacitor by the change of described series capacitor capacitance.
13. a kind of distributed serial power capacitor reactive compensation installations as claimed in claim 11, it is characterized in that: when described serial connection capacitor compensating device is input state, when the ratio of capacitance voltage value is less than or equal to 90% corresponding to described capacitance voltage measured value and line current measured value, then judge that thyristor is short-circuited damage.
14. a kind of distributed serial power capacitor reactive compensation installations as claimed in claim 12, it is characterized in that: described device by described input State Transferring in the process of described exit status, have in the 20-100ms time, if the voltage measuring value of the capacitance voltage value corresponding to line current measured value and described series capacitor is unequal, then judge that turn on thyristors works, namely not there is open circuit breakage in thyristor;
If the capacitance voltage value corresponding to line current measured value is equal with the voltage measuring value of described series capacitor, then judge the non-conducting of thyristor, i.e. thyristor generation open circuit breakage.
15. a kind of distributed serial power capacitor reactive compensation installations as claimed in claim 1, is characterized in that: described control module communicates with described communication module respectively with described protection module;
Described control module for sending bypass breaker and thyristor separately and closed operation signal, monitoring overvoltage and overcurrent operating mode, and performs protection act, avoids described distributed serial power capacitor reactive compensation installation to damage;
Described control module controls the State Transferring of described distributed serial power capacitor reactive compensation installation according to the method that the conversion of part mated condition or full mated condition are changed;
Described protection module be used for when transmission line is short-circuited fault, rapid closing or keep bypass breaker close a floodgate and turn on thyristors until failure vanishes;
Described communication module, for receiving control command or definite value arranges instruction, completes the operation of described Control protection system, and receives the information of described control module and described protection module, feed back the state information of described distributed serial power capacitor reactive compensation installation.
16. a kind of distributed serial power capacitor reactive compensation installations as claimed in claim 15, is characterized in that: described communication module adopts general packet radio service technology, G mobile communication or forth generation mobile communication technology to carry out communication.
17. a kind of distributed serial power capacitor reactive compensation installations as claimed in claim 1, is characterized in that: described Control protection system is furnished with that get can circuit, described in get can circuit adopt voltage get can, current energy-taking or electric current and voltage hybrid mode carry out getting energy.
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| CN106229994A (en) * | 2016-07-28 | 2016-12-14 | 中电普瑞科技有限公司 | A kind of novel series compensation device |
| CN106972502A (en) * | 2017-04-25 | 2017-07-21 | 安徽伊格瑞德电气设备有限公司 | A kind of series capacitor segmented compensation device |
| CN107104392A (en) * | 2017-05-24 | 2017-08-29 | 武汉理工大学 | A kind of Distributed Power Flow controller installation method suitable for overhead transmission line |
| CN114002496A (en) * | 2022-01-04 | 2022-02-01 | 成都齐碳科技有限公司 | Compensation capacitance adjusting circuit, compensation capacitance adjusting method and nanopore sequencing circuit |
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