CN107069758A - Quality of power supply intelligent comprehensive optimization device with scene temperature alarm function - Google Patents
Quality of power supply intelligent comprehensive optimization device with scene temperature alarm function Download PDFInfo
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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
-
- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- 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
-
- 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
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
DVR current transformers, the first DC capacitor and APF current transformer parallel connections are formed in a kind of quality of power supply intelligent comprehensive optimization device with scene temperature alarm function of present invention offer, the device compensates loop for the first of voltage compensation；DVR current transformers, the second DC capacitor and the 2nd APF current transformer parallel connections form the second compensation loop for harmonic management and reactive-load compensation；Load compensator is used to record the parameters such as the startup, operation, excision of certain loads；DC voltage fluctuation suppressor is used for the DC voltage for suppressing first and second DC capacitor；Network controller is used to realize that control first compensates the voltage compensation in loop, controls the second harmonic management for compensating loop and reactive-load compensation and the Parameter Variation in load compensator to provide corresponding backoff algorithm.Implement the present invention, offset voltage is fallen during grid voltage sags, without progress harmonic management and reactive-load compensation when falling, and the high-quality output waveform of voltage pulsation acquisition can be suppressed, and the compensation speed that power quality compensation is carried out to user can be improved.
Description
Technical field
The present invention relates to technical field of power systems, more particularly to a kind of quality of power supply with scene temperature alarm function
Intelligent comprehensive optimizes device.
Background technology
UPQC (Unified Power Quality Conditioner, unified power quality adjusting device) is generally by going here and there
Connection type voltage source converter and parallel connection type voltage source converter are combined into by common DC bus, and it is arranged on user side
Near harmonic load, voltage and current can be compensated simultaneously.Series-type voltage source current transformer plays DVR (Dynamic
Voltage Restorer, dynamic voltage compensator) effect, can suppress voltage pulsation, compensate supply voltage harmonic wave, elimination is matched somebody with somebody
Recurrent voltage swell or Problem of Voltage Temporary-Drop in electric system, improve the damping of device.Parallel connection type voltage source converter rises
To APF (Active Power Filter, Active Power Filter-APF) effect, load harmonic current, compensation load nothing can be filtered out
Work(power.
As shown in figure 1, UPQC combines DVR and APF converter structure, DVR current transformers D1* and APF in the prior art
Shared DC capacitor C1*, the DVR current transformer D1* of current transformer F1* is concatenated transformer T1* and is connected to network system side, with dimension
Voltage at tie point, offset voltage flickering and asymmetric function are held, APF current transformers F1* is concatenated reactor L1* and is connected to load
Side, is mainly used in compensation harmonic and reactive current, while maintaining the direct current between DVR current transformer D1* and APF current transformers F1*
Pressure is constant.Wherein, DVR current transformers D1* and APF current transformer F1* is two-way PWM (Pulse-Width Modulation, pulse
Width modulated) current transformer, rectification state can be both operated in, inverter mode can also be operated in；DVR current transformers D1* is concatenated
Transformer T1* exports fundamental positive sequence offset voltage, to power network injecting power, while can also output harmonic wave offset voltage；APF becomes
Flow device F1* to compensate to power network harmonic, while reactive current can be exported.
, it is necessary to coordinate DVR functions and APF functions in the UPQC courses of work, when there is Voltage Drop, DVR function ons,
Now APF functions have two kinds of selections：First, synchronism stability DC capacitor C1* voltages, for Voltage Drop compensation, but shortcoming exists
In：UPQC is there is no harmonics and reactive compensation, when series side just carries out voltage compensation, the harmonic wave of power network and idle peak occurs
Value, harmonic management and reactive-load compensation need to be carried out in time；2nd, compensation harmonic, no longer maintenance DC capacitor C1* voltages, but shortcoming
It is：DVR compensation functions are limited, because the energy that DVR functions are only stored by DC capacitor C1* and its attached energy storage device is completed,
Energy is finished, and DVR compensation functions terminate, until DC capacitor C1* recovers to normal condition, can just carry out DVR compensation next time
Action.
By retrieval, China Patent Publication No. is that the A of CN 104393599 disclose a kind of unified power quality adjusting device
And method, above mentioned problem is preferably solved, still, in the program, the inventors discovered that, in the selection of above two APF functions
In, DC capacitor C1* voltage is easily fluctuated, and is unfavorable for obtaining high-quality output waveform, and harmonic wave due to user load and
Idle characteristic is regular so that user can not obtain the compensation speed of outstanding power quality compensation.It is therefore desirable to this
It is improved.
In addition, the scene temperature of quality of power supply intelligent comprehensive optimization device directly affects the stability of its operation, therefore
It is necessary to carry out its temperature detection control, and scene alarm, to improve its operation stability.
The content of the invention
Technical problem to be solved of the embodiment of the present invention is that there is provided a kind of electric energy with scene temperature alarm function
Quality intelligent complex optimum device, offset voltage is fallen during grid voltage sags, without progress harmonic management and idle benefit when falling
Repay, and voltage pulsation can be suppressed and obtain high-quality output waveform, and the compensation speed that power quality compensation is carried out to user can be improved
Degree.
In order to solve the above-mentioned technical problem, the embodiments of the invention provide a kind of electric energy with scene temperature alarm function
Quality intelligent complex optimum device, described device includes DVR current transformers, the first APF current transformers, the 2nd APF current transformers, first straight
Flow electric capacity, the second DC capacitor, transformer, the first reactor, the second reactor, network controller, load compensator and direct current
Voltage pulsation suppressor；Wherein,
The DVR current transformers, the first DC capacitor and the first APF current transformers three parallel connection form first and compensate loop, and
The one end in the first compensation loop is connected from the DVR current transformers side by the transformer with grid side, and the other end is from institute
The first APF current transformers side is stated by first reactor with load-side to be connected, during for Voltage Drop in the grid side,
Voltage compensation is carried out, maintains the DC voltage between the DVR current transformers and the first APF current transformers constant；
The DVR current transformers, the second DC capacitor and the 2nd APF current transformers three parallel connection form second and compensate loop, and
The one end in the second compensation loop is connected from the DVR current transformers side by the transformer with the grid side, the other end
It is connected from the 2nd APF current transformers side by second reactor with the grid side, for the nothing in the grid side
During Voltage Drop, harmonic management and reactive-load compensation are carried out；
The load compensator at least one and be connected with the network controller, each load compensator is used to
Prestore and one be supported on the changing rule formed under all working state to load-side electrical network parameter, and according to the current work of load
Make state, corresponding load-side electrical network parameter changing rule and corresponding compensation startup time are sent to the network controller
In；Wherein, the working condition includes incision state, cuts out state and normal operating conditions；
The DC voltage fluctuation suppressor is connected with the network controller, for obtaining and correcting first direct current
Electric capacity and second DC capacitor distinguish corresponding voltage waveform；
The network controller is also connected with the DVR current transformers, the first APF current transformers and the 2nd APF current transformers simultaneously,
For when the current voltage for detecting the grid side is less than default threshold value, determining the Voltage Drop of the grid side, opening
The dynamic DVR current transformers carry out voltage compensation, and control the voltage of the first APF current transformers maintenance first DC capacitor
It is constant, and control the 2nd APF current transformers to carry out harmonic management and reactive-load compensation；Or working as the grid side ought be detected
When preceding voltage is more than default threshold value, determine that the voltage of the grid side, without falling, cuts off the DVR current transformers voltage compensation,
And control the first APF current transformers to carry out harmonic management and reactive-load compensation, and the 2nd APF current transformers are controlled to described
Second DC capacitor charges；And the load-side electrical network parameter changing rule sent according to each load compensator is preset with
Corresponding backoff algorithm.
Wherein, each load compensator by ARM chips, memory FLASH, display screen, communication interface and its
Peripheral circuit is formed.
Wherein, the DC voltage fluctuation suppressor includes voltage waveform screening unit and voltage waveform revision unit；Its
In,
The voltage waveform screening unit is right respectively for obtaining first DC capacitor and second DC capacitor
The voltage waveform answered, and the voltage waveform got is distinguished into analog-modulated into corresponding sine waveform, and further
The amplitude for filtering out sine waveform in the first DC capacitor after the simulation and the second DC capacitor is unsatisfactory for screening respectively
At the time of condition, determine in the sine waveform of first DC capacitor and second DC capacitor and correspond to respectively each
Screen the pulse width of moment DC voltage component and each DC voltage component；
The voltage waveform revises unit, the sine for obtaining first DC capacitor and second DC capacitor
The numerical value of each self-sizing moment harmonic voltage component is corresponded in ripple waveform respectively, and according to the sine wave of first DC capacitor
Waveform is and described second straight in the pulse width of its correspondence screening moment DC voltage component and the numerical value of harmonic voltage component
The sine waveform of electric capacity is flowed in the pulse width of its correspondence screening moment DC voltage component and the numerical value of harmonic voltage component,
The voltage waveform of first DC capacitor and the voltage waveform of second DC capacitor are revised respectively.
Wherein, the voltage waveform revision unit includes harmonic wave sampling module, harmonic constant revision module and waveform revision
Module；Wherein,
The harmonic wave sampling module, exists for the voltage waveform to first DC capacitor and second DC capacitor
Each self-sizing moment harmonic voltage component is sampled, and determines the sine of first DC capacitor and second DC capacitor
Numerical value of the ripple waveform in each self-sizing moment harmonic voltage component；
The harmonic constant revises module, in the sine waveform of first DC capacitor, by same screening
When the harmonic voltage component values that engrave divided by DC voltage component pulse width values after and be accumulated as first direct current
The harmonic constant of appearance；And in the sine waveform of second DC capacitor, the harmonic voltage engraved during by same screening
After component values divided by the pulse width values of DC voltage component and it is accumulated as the harmonic constant of second DC capacitor；
The waveform revises module, is multiplied by described first respectively for the harmonic constant by first DC capacitor straight
The voltage waveform for flowing electric capacity adjusts the voltage waveform width of first DC capacitor in the waveforms amplitude at its correspondence screening moment
Value；And the voltage waveform for by the harmonic constant of second DC capacitor being multiplied by second DC capacitor respectively is right at its
The waveforms amplitude at moment should be screened to adjust the voltage waveform amplitude of second DC capacitor.
Wherein, the parameter include being supported on voltage x current instruction under current operating state, PI parameters, filtering parameter and
Overtone order.
Implement the embodiment of the present invention, have the advantages that：
1st, in embodiments of the present invention, due to there are two compensation loops in device, in grid side Voltage Drop, the
The 2nd APF current transformers that the first APF current transformers in one compensation loop are used in voltage compensation, the second compensation loop are used for harmonic wave
And reactive-load compensation, so that realize can burning voltage be constant ensures Voltage Drop compensation effect, and energy in the first compensation loop
Harmonics and reactive compensation is carried out in time in the second compensation loop；
2nd, in embodiments of the present invention, due to being employed in device with loading one-to-one load compensator, load is mended
The changing rule for being stored with and being supported under all working state to load-side electrical network parameter in device is repaid, and the network in device is controlled
Device is then previously stored with the backoff algorithm under each load all working state of correspondence, so that the network controller in device
Delay from mutation to improvement can be reduced, while compensation quality can be improved according to the backoff algorithm prestored；
3rd, in embodiments of the present invention, the first DC capacitor is improved due to employing DC voltage fluctuation suppressor in device
With the pulse width of the second DC capacitor, the adverse effect that harmonic voltage is brought is reduced, so as to more effectively reduce the first direct current
The DC voltage fluctuation of electric capacity and the second DC capacitor, obtains the more excellent sine waveform of quality.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, according to
These accompanying drawings obtain other accompanying drawings and still fall within scope of the invention.
Fig. 1 optimizes the structural representation of device for the quality of power supply intelligent comprehensive that prior art is provided；
Fig. 2 is the structural representation that quality of power supply intelligent comprehensive provided in an embodiment of the present invention optimizes device；
The theory diagram of Fig. 3 scene temperature Alarm Units.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with accompanying drawing
It is described in detail on step ground.
As shown in Fig. 2 being a kind of quality of power supply intelligence with scene temperature alarm function provided in an embodiment of the present invention
Complex optimum device, the device includes DVR current transformers D1, the first APF current transformers F1, the 2nd APF current transformers F2, the first direct current
Hold C1, the second DC capacitor C2, transformer T1, the first reactor L1, the second reactor L2, network controller M, load compensator
J and DC voltage fluctuation suppressor K；Wherein,
DVR current transformers D1, the first DC capacitor C1 and the first APF current transformers F1, which are in parallel between latter three, is formed as the first benefit
Loop 11 is repaid, and the one end in the first compensation loop 11 is connected from DVR current transformer D1 sides by transformer T1 with grid side, the other end
It is connected from the first APF current transformer F1 sides by the first reactor L1 with load-side, in the Voltage Drop of grid side, carrying out
Voltage compensation, maintains the DC voltage between DVR current transformers D1 and the first APF current transformers F1 constant；
DVR current transformers D1, the second DC capacitor C2 and the 2nd APF current transformers F2, which are in parallel between latter three, is formed as the second benefit
Loop 12 is repaid, and the one end in the second compensation loop 12 is connected from DVR current transformer D1 sides by transformer T1 with grid side, the other end
It is connected from the 2nd APF current transformer F2 sides by the second reactor L2 with grid side, for when the no-voltage of grid side falls, entering
Row harmonic management and reactive-load compensation；
Load compensator J at least one and be connected with network controller M, each load compensator J is used to prestore
One is supported on the changing rule formed under all working state to load-side electrical network parameter, and according to load current operating state,
Corresponding load-side electrical network parameter changing rule and corresponding compensation startup time are sent into network controller M；Wherein, institute
Stating working condition includes incision state, cuts out state and normal operating conditions；
DC voltage fluctuation suppressor K is connected with network controller M, for obtaining and correcting the first DC capacitor C1 and
Two DC capacitor C2 distinguish corresponding voltage waveform；
Network controller M is also connected with DVR current transformers D1, the first APF current transformers F1 and the 2nd APF current transformers F2 simultaneously,
For when the current voltage for detecting grid side is less than default threshold value, determining the Voltage Drop of grid side, starting DVR unsteady flows
Device D1 carries out voltage compensation, and controls the first APF current transformers F1 to maintain the first DC capacitor C1 voltage constant, and control the
Two APF current transformers F2 carry out harmonic management and reactive-load compensation；Or when the current voltage for detecting grid side is more than default threshold value
When, determine that the voltage of grid side, without falling, cuts off DVR current transformer D1 voltage compensations, and it is humorous to control the first APF current transformers F1 to carry out
Ripple processing and reactive-load compensation, and the 2nd APF current transformers F2 of control charge to the second DC capacitor C2；And according to each load
The load-side electrical network parameter changing rule that compensator is sent is preset with corresponding backoff algorithm.
In embodiments of the present invention, DVR current transformers D1 by IGBT (Insulated Gate BipolarTransisto, absolutely
Edge grid bipolar transistor) module, drive circuit and protection circuit composition, distortion and fundamental wave of its function for detection line voltage
Deviation, as voltage instruction, is controlled to DVR current transformers D1 so that DVR current transformers D1 by transformer T1 export one with
The offset voltage that line voltage is distorted and fundamental wave deviation is offseted, so that proof load voltage is a specified sinusoidal voltage；
First APF current transformers F1 is equally made up of IGBT modules, drive circuit and protection circuit, and its function includes：1st, examine
Survey load idle harmonic electric current, as current-order, current transformer F1 is controlled so that current transformer F1 export with
The equal idle harmonic of idle harmonic size of current is loaded, so as to realize the compensation to loading idle harmonic electric current, is made
It is sine-wave current to obtain power network input current, and power factor is 1；2nd, when line voltage is fluctuated, system is operated in DVR states
When, current transformer F1 stops no-power compensation function, is only responsible for having power input, is the direct current that DVR stablizes the first DC capacitor C1
Pressure, is no longer participate in the harmonic wave of power network and idle improvement；
2nd APF current transformers F2 is same by IGBT modules, drive circuit and protection circuit composition, and its function includes：1st, examine
Survey and be supported on incision, real-time working, cut out under the conditions of the status information that is sent by LAN, the lookup in network controller M
The incision of correspondence load, real-time working, the solidification APF programs cut out, according to program curing as current-order, to the current transformer
F2 is controlled so that current transformer F2 exports the idle harmonic equal with loading idle harmonic size of current, so that real
Now to the compensation of the idle harmonic electric current of load so that power network input current is sine-wave current, and power factor is 1；2nd, electricity is worked as
When net voltage fluctuation occurs and needs to carry out DVR compensation, then current transformer F2 carries out idle harmonic compensation.
Network controller M is used as the control core of device, the DSP+FPGA frameworks based on bus structures, for completing power network
Voltage acquisition, control strategy debugging, backoff algorithm realizes that voltage x current instruction is exported and other systemic-functions.Except comprising above-mentioned
Outside basic function, network controller M also controls load compensator R to carry out the recording of certain loads, and recorder data is stored in
In load compensator R, the certain loads side that load compensator R is arranged on user communicates with network controller M, so that based on local
The UPQC of net just can be according to user consumption habit, real-time electricity consumption strategy, adjustment controller output, to user carry out electricity consumption matter
Amount compensation.
It should be noted that network controller M will also store user power utilization facility information, carried out with user power utilization equipment
TCP/IP communication, Content of Communication includes order transmission bag and parameter transmits bag；Wherein, order transmission bag content includes device id
Number, device action is instructed (in cutting or cut out or being currently running), acts expeced time, time calibration, data check etc., therefore
In network controller M default backoff algorithm can according to user power utilization facility information, be it is any load be provided be supported on it is any
Corresponding backoff algorithm under working condition, so that the network controller M in device can be calculated according to the compensation prestored
Method, reduces the delay from mutation to improvement, while compensation quality can be improved.
As an example, load cuts every time, cut out and normal operating condition under, all need setting UPQC to work in recording
State, then UPQC detects the quality of power supply influence of fluctuations that load action is caused to load-side power network, and data inputting is loaded into benefit
Device J is repaid, the front and rear access time can be set by user, can be not limited to record the front and rear 1.5 second time of Voltage Drop, cut,
The rear 2 second time cut out, 2~5 second time of normal operating conditions, influence is cut out as the falling of load equipment, harmonic wave, incision
Reference.After load compensator record load equipment parameter, incision with load equipment, cut out or normal operating condition is associated,
When load-side prepares startup, arrestment, communicated first by local network interface with UPQC, device recording parameter is passed through into TCP/
IP sends network controller to, and network controller loads algorithm, and waiting facilities starts.After equipment startup is detected, according to pre-
Precalculated voltage x current instructs the harmonic wave produced to load is idle to compensate, and can greatly reduce the time that LPF is brought
Delay, while reducing the delay of PI parameter regulations, significantly improves software, the hardware delay of quality of power supply intelligent comprehensive optimization device,
Accelerate the power quality controlling reaction speed for certain loads.Wherein, load compensator J parameter includes being supported on current work
Make voltage x current instruction under state, PI parameters, filtering parameter harmonic number of times.
In order to overcome the first DC capacitor C1 and the second DC capacitor C2 DC voltage fluctuation, rushing for harmonic band is reduced
Hit, therefore DC voltage fluctuation suppressor K includes voltage waveform screening unit and voltage waveform revision unit；Wherein,
Voltage waveform screening unit, corresponding voltage wave is distinguished for obtaining the first DC capacitor and the second DC capacitor
Shape, and the voltage waveform got is distinguished into analog-modulated into corresponding sine waveform, and further filter out after simulation
At the time of the amplitude of sine waveform is unsatisfactory for screening conditions respectively in first DC capacitor and the second DC capacitor, is determined
Each self-sizing moment DC voltage component is corresponded in the sine waveform of one DC capacitor and the second DC capacitor respectively and each
The pulse width of DC voltage component；
Voltage waveform revises unit, in the sine waveform for obtaining the first DC capacitor and the second DC capacitor respectively
The numerical value of each self-sizing moment harmonic voltage component of correspondence, and screened according to the sine waveform of the first DC capacitor in its correspondence
The pulse width of moment DC voltage component and the numerical value of harmonic voltage component, and the sine waveform of the second DC capacitor exist
The pulse width of its correspondence screening moment DC voltage component and the numerical value of harmonic voltage component, revise the first DC capacitor respectively
Voltage waveform and the second DC capacitor voltage waveform.
Wherein, voltage waveform revision unit includes harmonic wave sampling module, harmonic constant revision module and waveform revision module；
Wherein,
Harmonic wave sampling module, for the voltage waveform to the first DC capacitor and the second DC capacitor at each self-sizing moment
Harmonic voltage component is sampled, and determines the sine waveform of the first DC capacitor and the second DC capacitor at each self-sizing moment
The numerical value of harmonic voltage component；
Harmonic constant revises module, in the sine waveform of the first DC capacitor, being engraved during by same screening
After harmonic voltage component values divided by the pulse width values of DC voltage component and it is accumulated as the harmonic constant of the first DC capacitor；
And in the sine waveform of the second DC capacitor, the harmonic voltage component values divided by direct current engraved during by same screening
Press after the pulse width values of component and be accumulated as the harmonic constant of the second DC capacitor；
Waveform revises module, is multiplied by the voltage of the first DC capacitor respectively for the harmonic constant by the first DC capacitor
Waveform adjusts the voltage waveform amplitude of the first DC capacitor in the waveforms amplitude at its correspondence screening moment；And it is straight by second
The voltage waveform that the harmonic constant of stream electric capacity is multiplied by the second DC capacitor respectively is adjusted in the waveforms amplitude at its correspondence screening moment
The voltage waveform amplitude of whole second DC capacitor.
In embodiments of the present invention, the voltage contained by the first DC capacitor C1 and the second DC capacitor C2 voltage waveform point
Amount is identical.Therefore, the suppression of DC voltage fluctuation, the voltage are illustrated by taking the first DC capacitor C1 voltage waveform V (t) as an example
Waveform V (t) is decomposed into DC voltage component, harmonic voltage component and resultant distortion component, is specifically unfolded as follows formula (1)：
Wherein, V (t) is the first DC capacitor C1 voltage waveform, V0For the first DC capacitor C1 DC voltage component,
I.e. voltage-target, can be a fixed value；For the first DC capacitor C1 harmonic voltage component；N is harmonic wave
Sequence；P is detection highest order harmonicses number of times；For harmonic wave initial phase；VψInfluence of fluctuations for the first DC capacitor C1 is relatively low
Resultant distortion component；
Due to the first DC capacitor C1 DC voltage, each harmonic component can produce influence to the height of pulse,
Have an impact larger harmonic component, the influence situation cancelled out each other and the situation mutually strengthened for also having different harmonic components, because
This in order to determine influence of the harmonic voltage to the first DC capacitor C1 voltage waveform, it is necessary to first pass through voltage waveform simulate by
Sine waveform after modulation, and be compared with normal sine wave, so that the distortion moment caused by harmonic voltage is found, and
Further eliminate.In view of the distortion moment simulates the pulse height (i.e. amplitude) of the sine waveform after being modulated by shadow
Ring, therefore the pulse width of distortion moment DC voltage component can be adjusted, to ensure that the area of pulse is consistent, so as to correct just
Output waveform of the string ripple at the distortion moment.
The moment of distorting can be determined by screening the pulse height (i.e. amplitude) for the output sine waveform simulated, that is, screened
Go out amplitude in the sine waveform after simulation to be unsatisfactory at the time of screening conditions (such as N number of), while straight in order to adjust the distortion moment
The pulse width of component of voltage is flowed, the purpose of amendment output sine wave is reached, it is therefore desirable to determine DC voltage in voltage waveform
Component screening moment (N number of) pulse width corresponding respectively, is repaired one by one to carry out waveform.
According to the spectral characteristic of periodic signal, overtone order is higher, and harmonic component is smaller, and harmonic voltage component carries out limited
Number of times is sampled.
(distort the moment) k, k=1,2...m so that one is screened the moment as an example, wherein, m is total time pulse period；It is false
Such as hits M=10, then 10 subharmonic of sampling, as a group objects, are each harmonic wave plus a coefficient, to represent to modulation
The influence of pulse width.According to formula (2), the corresponding harmonic constant β ik of each hits on moment k are obtained：
Wherein, i is 10, therefore can derive detection highest order harmonicses number of times p >=10 in the present embodiment；
And according to the corresponding harmonic constant β of each hits calculatedik, the accumulation of all 10 coefficients is got up, drawn
First DC capacitor C1 harmonic constant β on moment kk, i.e.,Further by the first DC capacitor C1 at the moment
The harmonic constant calculated respectively on 1-m is added up, and obtains the first DC capacitor C1 harmonic constant β, i.e.,
Set the first DC capacitor C1 moment k voltage waveform amplitude Ton(k), by harmonic constant β and the voltage wave at k moment
Shape amplitude Ton(k) it is multiplied, revision k moment voltage waveform amplitudes Ton(k) it is corresponding productThe like, will be all
The voltage waveform amplitude at screening moment is changed to corresponding product (pulse width i.e. after harmonic constant compensation), waits own
The screening moment all compensate after the completion of, voltage waveform is modulated into sinewave output, so as to overcome the limitation of prior art
Property, DC voltage fluctuation is more effectively reduced, the more excellent sine waveform of quality is obtained.
Similarly, the second DC capacitor C2 DC voltage suppresses, and the DC voltage suppression with the first DC capacitor C1 is identical,
It will not be repeated here.
In embodiments of the present invention, each load compensator J is by ARM chips, memory FLASH, display screen, communication
Interface and its peripheral circuit are formed.Wherein, communication interface include LAN mouthful, USB/SD bayonet sockets, I/O mouthfuls, RS232 interfaces etc., this
It is responsible for for LAN mouthfuls being communicated with network controller M, Content of Communication, which includes setting up, to be connected, and recorder data is stored during recording, during work
Upload load information；RS232 interfaces are used for the debugging that communicated with PC；USB/SD is used for external agency downloading data；I/O mouthfuls are used to connect
Receive load control signal；ARM chips are responsible for whole load compensator J processor function；FLASH is used to store load compensator
J ID data and correspondence load-related parameter；Display screen is formed by charactron, the work for showing present load compensator J
Make state (standby, data are downloaded, and data are uploaded).
In embodiments of the present invention, quality of power supply intelligent comprehensive optimization device has following several working conditions：
(1) starting state：The upper electricity of UPQC, UPQC completes network controller self-inspection, I/O mouthfuls of state initializations, systematic parameter
Initialization, DC capacitor voltage is stable, the work such as LAN communication test and load compensator scanning；
(2) the first APF current transformer compensating coefficients：When UPQC self-inspections pass through, and it is not detected by the Voltage Drop scope of setting
When (so that single-phase voltage is detected as an example), device is operated in the first APF current transformer compensating coefficients.In this case, UPQC be responsible for into
Row works three parts of voltage stabilization of the reactive-load compensation of load, harmonics restraint and the first DC capacitor；
(3) the 2nd APF current transformer compensating coefficients：Operational module includes DVR current transformers, the 2nd APF current transformers, network control
Device, the second reactor and IGBT power devices.In this case, UPQC is only according to the load characteristic of user, using being solidificated in net
Control strategy (i.e. compensatory algorithm) in network controller carries out the improvement of idle harmonic, including the compensation started for load is consolidated
Change strategy execution, load the compensation program curing in the compensation program curing cut out and the certain loads course of work.Work as power network
When Voltage Drop occurs for side, the 2nd APF current transformer functions switch to passive idle improvement harmonic and administered, and output current is idle defeated
Go out electric current harmonic administer electric current vector and.Now, the first APF current transformers only responsible absorption under the control of network controller
Network re-active power, by the voltage stabilization of the first direct current storage capacitance to but be not limited to 800V, provided constantly for DVR functions
Active support；
(4) passive compensating coefficient：Operational module includes DVR current transformers, the first APF current transformers, network controller and IGBT
Power device.In this case, UPQC is passively compensated using DVR current transformers and the first APF current transformers, i.e., only pass through detection
To electrical network parameter passively compensated, load-side load characteristic is not considered；Now the 2nd APF current transformers utilize IGBT reverse two
Pole pipe carries out rectification of deploying to ensure effective monitoring and control of illegal activities, and the second direct current village energy electric capacity is charged to but 500V is not limited to, and is system increase reactive power compensation planning；
(5) UPQC active-passives admixture：Operational module includes DVR current transformers, the first APF current transformers, the 2nd APF and become
Flow device, network controller, the first reactor, the second reactor and IGBT power devices.In this case, UPQC is to perform passively
State, while taking into account the solidification compensation function of system, i.e., if receiving Active Compensation regulating command (such as during passive compensation
When the action such as being loaded with cutting, cut out, load compensator sends a signal to network controller by LAN), then can be passive
Active Compensation state is switched under compensating coefficient, based on recorder data have the idle harmonic compensation being directed to；
(6) the 2nd APF current transformer compensating coefficients under state are fallen：When there is Voltage Drop in grid side, APF functions by
2nd APF current transformers are completed, and now the first APF current transformers are only responsible for the first direct current storage capacitance and are provided with power input, are maintained
The DC voltage stability of the electric capacity, the 2nd APF current transformers enter idle harmonic compensating coefficient, and advantage is that voltage can be mended
The idle effective shielding produced during DVR function operations is repaid, power system is effectively isolated with DVR；
(7) recording and compensating coefficient：Operational module include DVR current transformers, the first APF current transformers, the 2nd APF current transformers,
Network controller, the first reactor, the second reactor, IGBT power devices and multiple load compensators.In this case, UPQC
Compensation function be operated under passive compensating coefficient, network controller using the 2nd APF current transformers to certain loads carry out recording.
Recording content includes load incision, cuts out and load the load-side electrical network parameter changing rule under the conditions of normal operating conditions etc..
Load compensator, installed in load-side, when load equipment occurs incision, cuts out action, is born after recorder data loading is completed
Carry compensator and control command is sent to UPQC by local network interface, UPQC is received after the order of load compensator transmission, and meeting exists
Start the control strategy based on recorder data in setting time in communication data content, that is, start the record that LAN oral instructions come
Wave number evidence, and performed in UPQC, to compensate the idle harmonic of certain loads generation.
(8) DC voltage holddown：Operational module includes DC voltage suppressor.In this case, UPQC basis
First DC capacitor C1 and the second DC capacitor C2 distinguishes corresponding voltage waveform, the first DC capacitor C1 of reduction and the second direct current
The harmonic wave impact of electric capacity C2 difference corresponding voltage waveforms, so that, obtain the more excellent sine waveform of quality.
As shown in figure 3, the present invention also has scene temperature Alarm Unit, include audible-visual annunciator, temp probe and announcement
Alert master controller, temp probe is used for the temperature and output temperature signal for detecting quality of power supply intelligent comprehensive optimization device, described
Audible-visual annunciator be connected on alarm master controller, the detection signal of described temp probe passes through CAN input connection
To alarm master controller, the alarm master controller is handled the detection signal of temp probe, and controls audible-visual annunciator to move
Make.In addition, being also associated with LCD display, keyboard interface and memory cell on described alarm master controller.Described in the present embodiment
Alarm master controller use the ARM7TDMI-S microcontrollers LPC2368 of NXP companies, described CAN is preferred to use
Philips companies model SJA1000 CAN.
Implement the embodiment of the present invention, have the advantages that：
1st, in embodiments of the present invention, due to there are two compensation loops in device, in grid side Voltage Drop, the
The 2nd APF current transformers that the first APF current transformers in one compensation loop are used in voltage compensation, the second compensation loop are used for harmonic wave
And reactive-load compensation, so that realize can burning voltage be constant ensures Voltage Drop compensation effect, and energy in the first compensation loop
Harmonics and reactive compensation is carried out in time in the second compensation loop；
2nd, in embodiments of the present invention, due to being employed in device with loading one-to-one load compensator, load is mended
The changing rule for being stored with and being supported under all working state to load-side electrical network parameter in device is repaid, and the network in device is controlled
Device is then previously stored with the backoff algorithm under each load all working state of correspondence, so that the network controller in device
Delay from mutation to improvement can be reduced, while compensation quality can be improved according to the backoff algorithm prestored；
3rd, in embodiments of the present invention, the first DC capacitor is improved due to employing DC voltage fluctuation suppressor in device
With the pulse width of the second DC capacitor, the adverse effect that harmonic voltage is brought is reduced, so as to more effectively reduce the first direct current
The DC voltage fluctuation of electric capacity and the second DC capacitor, obtains the more excellent sine waveform of quality.
Can be with one of ordinary skill in the art will appreciate that realizing that all or part of step in above-described embodiment method is
The hardware of correlation is instructed to complete by program, described program can be stored in a computer read/write memory medium,
Described storage medium, such as ROM/RAM, disk, CD.
Above disclosed is only a kind of preferred embodiment of the invention, can not limit the power of the present invention with this certainly
Sharp scope, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (7)
1. a kind of quality of power supply intelligent comprehensive optimization device with scene temperature alarm function, it is characterised in that described device
Including DVR current transformers, the first APF current transformers, the 2nd APF current transformers, the first DC capacitor, the second DC capacitor, transformer,
One reactor, the second reactor, network controller, load compensator and DC voltage fluctuation suppressor；Wherein,
The DVR current transformers, the first DC capacitor and the first APF current transformers three parallel connection form first and compensate loop, and described
The one end in the first compensation loop is connected from the DVR current transformers side by the transformer with grid side, and the other end is from described the
One APF current transformers side is connected by first reactor with load-side, during for Voltage Drop in the grid side, is carried out
Voltage compensation, maintains the DC voltage between the DVR current transformers and the first APF current transformers constant；
The DVR current transformers, the second DC capacitor and the 2nd APF current transformers three parallel connection form second and compensate loop, and described
The one end in the second compensation loop is connected from the DVR current transformers side by the transformer with the grid side, and the other end is from institute
State the 2nd APF current transformers side by second reactor with the grid side to be connected, for the no-voltage in the grid side
When falling, harmonic management and reactive-load compensation are carried out；
The load compensator at least one and be connected with the network controller, each load compensator is used to prestore
One is supported on the changing rule formed under all working state to load-side electrical network parameter, and according to the load work at present shape
State, corresponding load-side electrical network parameter changing rule and corresponding compensation startup time are sent into the network controller；
Wherein, the working condition includes incision state, cuts out state and normal operating conditions；
The DC voltage fluctuation suppressor is connected with the network controller, for obtaining and correcting first DC capacitor
Distinguish corresponding voltage waveform with second DC capacitor；
The network controller is also connected with the DVR current transformers, the first APF current transformers and the 2nd APF current transformers simultaneously, is used for
When the current voltage for detecting the grid side is less than default threshold value, the Voltage Drop of the grid side is determined, starts institute
State DVR current transformers and carry out voltage compensation, and control the first APF current transformers to maintain the voltage of first DC capacitor permanent
It is fixed, and control the 2nd APF current transformers to carry out harmonic management and reactive-load compensation；Or the current of the grid side ought be detected
When voltage is more than default threshold value, determine that the voltage of the grid side, without falling, cuts off the DVR current transformers voltage compensation, and
Control the first APF current transformers to carry out harmonic management and reactive-load compensation, and control the 2nd APF current transformers to described the
Two DC capacitors charge；And the load-side electrical network parameter changing rule sent according to each load compensator is preset with pair
The backoff algorithm answered；
Also include scene temperature Alarm Unit, the scene temperature Alarm Unit includes audible-visual annunciator, temp probe and announcement
Alert master controller, temp probe is used for the temperature and output temperature signal for detecting quality of power supply intelligent comprehensive optimization device, described
Audible-visual annunciator be connected on alarm master controller, the detection signal of described temp probe passes through CAN input connection
To alarm master controller, the master controller is handled the detection signal of temp probe, and controls audible-visual annunciator to act.
2. device as claimed in claim 1, it is characterised in that each load compensator is by ARM chips, memory
FLASH, display screen, communication interface and its peripheral circuit are formed.
3. device as claimed in claim 1, it is characterised in that the DC voltage fluctuation suppressor is screened including voltage waveform
Unit and voltage waveform revision unit；Wherein,
The voltage waveform screening unit, it is corresponding for obtaining first DC capacitor and second DC capacitor difference
Voltage waveform, and the voltage waveform got is distinguished into analog-modulated into corresponding sine waveform, and further screening
The amplitude for going out sine waveform in the first DC capacitor after the simulation and the second DC capacitor is unsatisfactory for screening conditions respectively
At the time of, determine and correspond to each self-sizing in the sine waveform of first DC capacitor and second DC capacitor respectively
The pulse width of moment DC voltage component and each DC voltage component；
The voltage waveform revises unit, the sine wave ripple for obtaining first DC capacitor and second DC capacitor
The numerical value of each self-sizing moment harmonic voltage component is corresponded in shape respectively, and according to the sine waveform of first DC capacitor
In the pulse width and the numerical value of harmonic voltage component of its correspondence screening moment DC voltage component, and second direct current
The sine waveform of appearance is in the pulse width of its correspondence screening moment DC voltage component and the numerical value of harmonic voltage component, difference
Revise the voltage waveform of first DC capacitor and the voltage waveform of second DC capacitor.
4. device as claimed in claim 3, it is characterised in that the voltage waveform revision unit include harmonic wave sampling module,
Harmonic constant revises module and waveform revision module；Wherein,
The harmonic wave sampling module, for the voltage waveform to first DC capacitor and second DC capacitor respective
Screening moment harmonic voltage component is sampled, and determines the sine wave ripple of first DC capacitor and second DC capacitor
Numerical value of the shape in each self-sizing moment harmonic voltage component；
The harmonic constant revises module, in the sine waveform of first DC capacitor, by the same screening moment
On harmonic voltage component values divided by DC voltage component pulse width values after and be accumulated as first DC capacitor
Harmonic constant；And in the sine waveform of second DC capacitor, the harmonic voltage component engraved during by same screening
After the pulse width values of numerical value divided by DC voltage component and it is accumulated as the harmonic constant of second DC capacitor；
The waveform revises module, and first direct current is multiplied by respectively for the harmonic constant by first DC capacitor
The voltage waveform of appearance adjusts the voltage waveform amplitude of first DC capacitor in the waveforms amplitude at its correspondence screening moment；With
And the voltage waveform of second DC capacitor is multiplied by its correspondence sieve by the harmonic constant of second DC capacitor respectively
The waveforms amplitude at moment is selected to adjust the voltage waveform amplitude of second DC capacitor.
5. device as claimed in claim 4, it is characterised in that：The electricity of first DC capacitor (C1) and the second DC capacitor (C2)
Component of voltage contained by corrugating is identical, illustrates DC voltage fluctuation with the voltage waveform V (t) of the first DC capacitor (C1)
Suppress, the voltage waveform V (t) is decomposed into DC voltage component, harmonic voltage component and resultant distortion component, is specifically unfolded as follows
Formula (1)：
Wherein, V (t) is the voltage waveform of the first DC capacitor (C1), V0For the first DC capacitor (C1) DC voltage component,
I.e. voltage-target, can be a fixed value；For the harmonic voltage component of the first DC capacitor (C1)；N is humorous
Wave train；P is detection highest order harmonicses number of times；For harmonic wave initial phase；VψInfluence of fluctuations for the first DC capacitor C1 is relatively low
Resultant distortion component.
6. device according to claim 5, it is characterised in that：Setting screening moment k, k=1,2...m, wherein, m is arteries and veins
Rush total time in cycle；If hits M=10, then 10 subharmonic of sampling are each harmonic wave plus one are as a group objects
Number, to represent the influence to modulating pulse width, according to formula (2), obtains the corresponding harmonic series of each hits on moment k
Number βik：
Wherein, i is 10, therefore can derive detection highest order harmonicses number of times p >=10；
And according to the corresponding harmonic constant β of each hits calculatedik, the accumulation of all 10 coefficients is got up, first is drawn
DC capacitor C1 harmonic constant β on moment kk, i.e.,Further by the first DC capacitor C1 on moment 1-m
The harmonic constant calculated respectively is added up, and obtains the first DC capacitor C1 harmonic constant β, i.e.,
Set the first DC capacitor C1 moment k voltage waveform amplitude Ton(k), by harmonic constant β and the voltage waveform width at k moment
Value Ton(k) it is multiplied, revision k moment voltage waveform amplitudes Ton(k) it is corresponding productThe like, by all distortion
The voltage waveform amplitude at moment is changed to corresponding product, after the completion for the treatment of that all distortion moment all compensate, by voltage wave
Shape is modulated into sinewave output.
7. device as claimed in claim 1, it is characterised in that the parameter includes the voltage being supported under current operating state
Current-order, PI parameters, filtering parameter harmonic number of times.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221682A (en) * | 2008-01-21 | 2008-07-16 | 徐承东 | Wireless vibration detecting and warning system |
| CN104393599A (en) * | 2014-11-26 | 2015-03-04 | 深圳供电局有限公司 | Uniform power quality regulating device and method |
| CN105244880A (en) * | 2015-10-19 | 2016-01-13 | 深圳供电局有限公司 | Method and system for suppressing direct-current voltage fluctuation of power quality regulator |
-
2016
- 2016-11-21 CN CN201611023255.5A patent/CN107069758A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221682A (en) * | 2008-01-21 | 2008-07-16 | 徐承东 | Wireless vibration detecting and warning system |
| CN104393599A (en) * | 2014-11-26 | 2015-03-04 | 深圳供电局有限公司 | Uniform power quality regulating device and method |
| CN105244880A (en) * | 2015-10-19 | 2016-01-13 | 深圳供电局有限公司 | Method and system for suppressing direct-current voltage fluctuation of power quality regulator |
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