CN106655184A - Power distribution system capable of intelligent filtering compensation - Google Patents
Power distribution system capable of intelligent filtering compensation Download PDFInfo
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- CN106655184A CN106655184A CN201611109970.0A CN201611109970A CN106655184A CN 106655184 A CN106655184 A CN 106655184A CN 201611109970 A CN201611109970 A CN 201611109970A CN 106655184 A CN106655184 A CN 106655184A
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- distribution system
- admittance
- stability
- active
- voltage
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
-
- 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
Abstract
The invention discloses a power distribution system capable of intelligent filtering compensation, and the system can accurately and completely carry out the stability discrimination of a power distribution system of an active filtering device, and can change the control structure of the active filtering device into an inner loop structure which just needs to control a current from a conventional double-loop structure of current and voltage control. Therefore, the system is simple in setting of control parameters, is high in dynamic response speed, and is high in robustness.
Description
Art
The present invention relates to it is a kind of can intelligent filter compensation distribution system.
Background technology
The quality of power supply is the quality of electric energy in power system.Preferably electric energy should be the sine wave of ideal symmetrical.Some
Factor can make waveform deviate symmetrical sine, thus just generate power quality problem.The quality of power supply is the organic comprehensive of multiple indexs
Close, although a series of standard has been formulated each power quality index in countries in the world, but these are used for determining that single index is closed
Lattice and underproof standard, it is impossible to comprehensively, truly, uniquely reflect the property of total quality of power supply.
As the power equipment that all trades and professions put into gradually increases, the harmonic content in electrical network gradually increases, and such as chemical industry burns
Low-voltage high-capacity fairing is used in the electrolysis of alkali industry, and these Large Copacity harmonic currents are to electrical network, particularly other electrical equipments, use
Electric reliability can all be brought and have a strong impact on, therefore to the active filter of modularization multi-machine parallel connection of Large Copacity, high accuracy and high reliability
Ripple demand increasingly increases, and is increasingly becoming study hotspot.
Active filter can be tracked compensation to the harmonic wave that frequency and amplitude all change, and be the one of current harmonic wave control
Item key technology.Source filter is a kind of dynamic compensating device, can to the harmonic wave in electrical network, it is idle carry out quick response,
And increasingly receive publicity.And it is current, some application scenarios need to put into substantial amounts of single-phase load, and such case is generally indivedual
Occur when user is using Large Copacity, uneven single-phase load.Used as active filter, equipment certainly exists capacity limit, that
How quickly to obtain the virtual value of unbalanced component in uncompensated load becomes the key for calculating limiting figure.
Active filter with dynamic due to suppressing grid current harmonic, compensating power, it is to avoid because harmonic wave causes
A series of power quality problems.But with non-linear, the impact load that are connected on the electrical network of active filter place
Big electrical equipment or load is more and more and more and more mixed and disorderly, the power quality problem in the electrical network of active filter place
Fluctuation is larger, needs real-time detection, the parameter of the active filter that upgrades in time.
The content of the invention
The present invention provide it is a kind of can intelligent filter compensation distribution system, can accurately, comprehensively carry out active power filtering dress
Distribution system determination of stability is put, can be by the control structure of active filter by the bicyclic of traditional control electric current and voltage
Structure becomes the interior ring structure for only needing control electric current, thus sets simple, system rapid dynamic response speed with control parameter
With the technical characteristic of strong robustness.
To achieve these goals, the present invention provide it is a kind of can intelligent filter compensation distribution system, the distribution system bag
Include：
Feeder line, the feeder line is multiple, for providing electric energy for multiple loads；
Active filter, for providing reactive power for feeder line, to maintain stablizing for feeder line voltage, this has
Source filter is multiple, and is corresponded with the feeder line；
Grid-connecting apparatus, for realizing that active filter and feeder line are incorporated into the power networks, the grid-connecting apparatus and the feed
Circuit is corresponded；
And supervising device；
The supervising device includes：
Monitoring modular, control module and the communication bus for each module communication；
The monitoring modular, for real-time monitoring distribution system parameter, active filter parameter, the distribution system ginseng
Number include distribution system admittance, grid-connected end passive device equivalent admittance, harmonic load passive equivalence admittance, distribution system frequency,
Power distribution system voltage, electric current, the active filter parameter includes electric current loop disturbance gain, electric current loop open-loop branch gain；
The control module includes determination of stability unit and active power filtering control unit, wherein：
The determination of stability unit, based on the global admittance of distribution system the stability of system is judged；
The active power filtering control unit, using single closed-loop control harmonic filtration and compensation are realized.
Preferably, the determination of stability unit, the distribution system parameter, active filter parameter set up electric current loop
Admittance model, harmonic controling ring admittance model, according to the electric current loop admittance model and harmonic controling ring admittance model, obtain
The full form of admittance equivalent circuit of distribution system, including standby mode of operation and compensation operational mode.
Preferably, determination of stability unit obtains distribution under two kinds of operational modes according to the full form of admittance equivalent circuit
The expression formula of voltage, wherein Y at system grid connection operationtotalFor distribution system overall situation admittance：
Standby mode of operation：
Compensation operational mode：
In formula, E is power distribution system voltage, and E ' is incorporated into the power networks place's voltage for distribution system, YgFor distribution system admittance, YpFor
Grid-connected end passive device equivalent admittance, YiFor electric current loop admittance, YhiFor harmonic controling ring admittance, YLFor harmonic load passive equivalence
Admittance, I 'iFor active filter equivalent current source during standby operation (i=1,2 ... n), n be distribution system active power filtering dress
Put quantity, I 'hiSource filter equivalent current source, I when running for harmonic compensationLhFor harmonic current source.
Preferably, determination of stability unit judges the stability of distribution system according to distribution system overall situation admittance；It is described to match somebody with somebody
The stability of electric system be distribution system current steady excitation under all responses stablize, it is described excitation include distribution voltage,
Active filter output current source and load harmonic current source, the response including the distribution system place of being incorporated into the power networks voltage, have
Source filter output current and parallel passive device current.
Preferably, the method for the stability of determination of stability unit judges distribution system is：According to the distribution system for obtaining
Global admittance YtotalNyquist curves are drawn, the positive and negative traversing times of the negative real axis of s planes are obtained；If global admittance YtotalIt is right
The Nyquist curves answered are equal in the positive and negative traversing times of the negative real axis of s planes, then the distribution system is stablized；Conversely, power distribution system
System unstability.
Preferably, the method for the stability of determination of stability unit judges distribution system is：Led according to the distribution system overall situation
When frequency domain gain of receiving is zero, distribution system resonance point is determined, if the corresponding gain real part R of resonance pointdAll greater than zero, then this is matched somebody with somebody
Electric system is stablized；Conversely, distribution system unstability.
Preferably, active power filtering control unit, according to adjacent three control moment (k-1), the k and (k of monitoring modular collection
+ 1) the magnitude of voltage U on active filter DC bus capacitor C whendc(k-1)、Udc(k) and Udc(k+1), by expression formulaWithAsk for two neighboring control
In cycle after capacitive energy variation delta W (k+1) and Δ W (k) of DC side, using adjacent controlling cycle TkInterior electric capacity wattful power
Rate fluctuation Δ PdcFor a steady state value andThese restriction relations, substitute into equationAsk for active filter in k-th controlling cycle to absorb
Active power pdc(k)；The load current i at the k moment obtained by data acquisitionLα(k) and single-phase mains voltage uSα(k), using number
Letter lock phase ring forms delayed iLα(k) and uSαVirtual amount i of (k) pi/2Lβ(k) and uSβ(k)；Using pL(k)=uSα(k)iLa(k)+uSβ(k)
iLβK () calculates the instantaneous active power p of k moment load-sidesL(k)；P is obtained using LPF algorithmLThe DC component of (k)
Using equationObtain
The given instruction of electric current loop It is defeated with the electric current that the k moment active filters for obtaining are gathered through low pass filter
Go out value iCK () subtracts each other after, into digitlization PI controllers；PI controllers output valve and uSαK () subtracts each other after, single-phase full bridge is formed inverse
Become the modulated signal of unit, the driving pulse of single-phase full bridge inversion unit is generated by modulated signal.
The invention has the advantages that：(1) can Intelligent Recognition and tracking system run the change of topological sum state, obtain section
Point voltage, load, with the information such as exert oneself of branch line reactive-load compensation, and reactive-load compensation can be adjusted as information source dynamic and intelligent,
Coordinate the reactive power injection of each distributed active filter；(2) each node electricity of feeder line in distribution system is enabled to
Pressure meets the requirement of standard, coordinates distributed active filter and provides reactive power support to distribution system, further improves
The utilization rate and economic benefit of distributed active filter.
Description of the drawings
Fig. 1 show the present invention it is a kind of can intelligent filter compensation distribution system block diagram；
Fig. 2 shows a kind of flow chart of the operation method of the distribution system with filter.
Specific embodiment
Fig. 1 show the present invention it is a kind of can intelligent filter compensation distribution system, the distribution system includes：
Feeder line 14, the feeder line is multiple, for providing electric energy for multiple loads 15；
Active filter 12, for providing reactive power for feeder line 14, to maintain the steady of the voltage of feeder line 14
Fixed, the active filter is multiple, and is corresponded with the feeder line；
Grid-connecting apparatus 13, for realizing that active filter 12 and feeder line 14 are incorporated into the power networks, the grid-connecting apparatus 13 with
The feeder line 14 is corresponded；
With supervising device 11；
The supervising device 11 includes：
Monitoring modular 113, control module 112 and the communication bus 111 for each module communication；
The monitoring modular 113, for real-time monitoring distribution system parameter, active filter parameter, the power distribution system
System parameter includes distribution system admittance, grid-connected end passive device equivalent admittance, harmonic load passive equivalence admittance, distribution system frequency
Rate, power distribution system voltage, electric current, the active filter parameter includes that electric current loop disturbance gain, electric current loop open-loop branch increase
Benefit；
The control module 112 includes determination of stability unit and active power filtering control unit, wherein：
The determination of stability unit, based on the global admittance of distribution system the stability of system is judged；
The active power filtering control unit, using single closed-loop control harmonic filtration and compensation are realized.
Preferably, the determination of stability unit, the distribution system parameter, active filter parameter set up electric current loop
Admittance model, harmonic controling ring admittance model, according to the electric current loop admittance model and harmonic controling ring admittance model, obtain
The full form of admittance equivalent circuit of distribution system, including standby mode of operation and compensation operational mode.
Preferably, determination of stability unit obtains distribution under two kinds of operational modes according to the full form of admittance equivalent circuit
The expression formula of voltage, wherein Y at system grid connection operationtotalFor distribution system overall situation admittance：
Standby mode of operation：
Compensation operational mode：
In formula, E is power distribution system voltage, and E ' is incorporated into the power networks place's voltage for distribution system, YgFor distribution system admittance, YpFor
Grid-connected end passive device equivalent admittance, YiFor electric current loop admittance, YhiFor harmonic controling ring admittance, YLFor harmonic load passive equivalence
Admittance, I 'iFor active filter equivalent current source during standby operation (i=1,2 ... n), n be distribution system active power filtering dress
Put quantity, I 'hiSource filter equivalent current source, I when running for harmonic compensationLhFor harmonic current source.
Preferably, determination of stability unit judges the stability of distribution system according to distribution system overall situation admittance；It is described to match somebody with somebody
The stability of electric system be distribution system current steady excitation under all responses stablize, it is described excitation include distribution voltage,
Active filter output current source and load harmonic current source, the response including the distribution system place of being incorporated into the power networks voltage, have
Source filter output current and parallel passive device current.
Preferably, the method for the stability of determination of stability unit judges distribution system is：According to the distribution system for obtaining
Global admittance YtotalNyquist curves are drawn, the positive and negative traversing times of the negative real axis of s planes are obtained；If global admittance YtotalIt is right
The Nyquist curves answered are equal in the positive and negative traversing times of the negative real axis of s planes, then the distribution system is stablized；Conversely, power distribution system
System unstability.
Preferably, the method for the stability of determination of stability unit judges distribution system is：Led according to the distribution system overall situation
When frequency domain gain of receiving is zero, distribution system resonance point is determined, if the corresponding gain real part R of resonance pointdAll greater than zero, then this is matched somebody with somebody
Electric system is stablized；Conversely, distribution system unstability.
Preferably, active power filtering control unit, according to adjacent three control moment (k-1), the k and (k of monitoring modular collection
+ 1) the magnitude of voltage U on active filter DC bus capacitor C whendc(k-1)、Udc(k) and Udc(k+1), by expression formulaWithAsk for two neighboring control
In cycle after capacitive energy variation delta W (k+1) and Δ W (k) of DC side, using adjacent controlling cycle TkInterior electric capacity wattful power
Rate fluctuation Δ PdcFor a steady state value andThese restriction relations, substitute into equationAsk for active filter in k-th controlling cycle to absorb
Active power pdc(k)；The load current i at the k moment obtained by data acquisitionLα(k) and single-phase mains voltage uSα(k), using number
Letter lock phase ring forms delayed iLα(k) and uSαVirtual amount i of (k) pi/2Lβ(k) and uSβ(k)；Using pL(k)=uSα(k)iLa(k)+uSβ(k)
iLβK () calculates the instantaneous active power p of k moment load-sidesL(k)；P is obtained using LPF algorithmLThe DC component of (k)Using equation
Obtain the given instruction of electric current loop With the electric current that the k moment active filters for obtaining are gathered through low pass filter
Output valve iCK () subtracts each other after, into digitlization PI controllers；PI controllers output valve and uSαK () subtracts each other after, single-phase full bridge is formed
The modulated signal of inversion unit, by modulated signal the driving pulse of single-phase full bridge inversion unit is generated.
Referring to accompanying drawing 2, a kind of flow chart of the operation method of distribution system with filter of the present invention, the method
Comprise the steps：
S1. monitoring modular real-time monitoring distribution system parameter, active filter parameter；
S2. the stability of distribution system is judged；
S3. according to the stable judged result of distribution system, determine that active filter is incorporated into the power networks strategy；
S4. harmonic wave is filtered using monocyclic control algolithm control active filter real-Time Compensation.
Preferably, in step sl, the distribution system parameter includes that distribution system admittance, grid-connected end passive device are equivalent
Admittance, harmonic load passive equivalence admittance, distribution system frequency, power distribution system voltage, electric current, the active filter parameter
Including electric current loop disturbance gain, electric current loop open-loop branch gain.
Preferably, in step S2, including following sub-step：
S21. electric current loop admittance model, harmonic controling are set up according to the distribution system parameter, active filter parameter
Ring admittance model；
S22. according to the electric current loop admittance model and harmonic controling ring admittance model, the full admittance shape of distribution system is obtained
Formula equivalent circuit, including standby mode of operation and compensation operational mode；
S23. according to the full form of admittance equivalent circuit obtain distribution system under two kinds of operational modes be incorporated into the power networks place electricity
The expression formula of pressure, wherein YtotalFor grid-connected system overall situation admittance：
Standby mode of operation：
Compensation operational mode：
In formula, E is power distribution system voltage, and E ' is incorporated into the power networks place's voltage for distribution system, YgFor distribution system admittance, YpFor
Grid-connected end passive device equivalent admittance, YiFor electric current loop admittance, YhiFor harmonic controling ring admittance, YLFor harmonic load passive equivalence
Admittance, I 'iFor active filter equivalent current source during standby operation (i=1,2 ... n), n be distribution system active power filtering dress
Put quantity, I 'hiSource filter equivalent current source, I when running for harmonic compensationLhFor harmonic current source；
S24. determination of stability unit judges the stability of distribution system according to distribution system overall situation admittance；The power distribution system
The stability of system is that all responses of the distribution system under current steady excitation are stablized, and the excitation includes distribution voltage, active
Filter output current source and load harmonic current source, the response is incorporated into the power networks including distribution system and locates voltage, active filter
Wave apparatus output current and parallel passive device current.
Preferably, the method for the stability of determination of stability unit judges distribution system is：According to the distribution system for obtaining
Global admittance YtotalNyquist curves are drawn, the positive and negative traversing times of the negative real axis of s planes are obtained；If global admittance YtotalIt is right
The Nyquist curves answered are equal in the positive and negative traversing times of the negative real axis of s planes, then the distribution system is stablized；Conversely, power distribution system
System unstability.
Preferably, the method for the stability of determination of stability unit judges distribution system is：Led according to the distribution system overall situation
When frequency domain gain of receiving is zero, distribution system resonance point is determined, if the corresponding gain real part R of resonance pointdAll greater than zero, then this is matched somebody with somebody
Electric system is stablized；Conversely, distribution system unstability.
Preferably, in step S4, determined by following steps and must be compensated under the real work of active filter
Current-order：
It is-virtual current of pi/2 and voltage to monophase system construction and actual current and voltage phase difference in single-phase circuit
Component, forms the orthogonal α β coordinate systems of two-phase, obtains：
Wherein, usAnd isRespectively single-phase mains voltage and compensation after single-phase power network current, usαAnd usβRespectively usIn α
α and β components in β coordinate systems；VmU is respectively with ωsAmplitude and angular frequency, iLαAnd iLβRespectively iLIn α β coordinate systems
α and β components；isαAnd isβRespectively isα and β components in α β coordinate systems；iLmFor iLIn fundamental voltage amplitude；iSmFor iSWidth
Value；WithRespectively iLFundametal compoment and isWith usPhase difference；inFor iLIn nth harmonic amplitude；For iLIn n time
Harmonic wave and usPhase difference, wherein, angular frequency is obtained by the effect of single-phase PLL (Phase locked loop) link
's；
The instantaneous active for asking for single-phase grid side and load-side using PQ conversion is idle：
Wherein, pSAnd qSRespectively grid side instantaneous active and instantaneous reactive power；pLAnd qLRespectively load-side is instantaneous
Active and instantaneous reactive power；
In view of in actual applications, always there are some loss (such as major loop components and parts heat wastes in active filter
The loss of consumption and power switch pipe) so that active filter must absorb appropriate active power from electrical network, for stable
DC voltage.Therefore under actual working state, active filter needs the power of compensation as follows：
Wherein, Δ pdcThe wattful power absorbed from single-phase electrical network to maintain active filter DC voltage to must
Rate,For the concussion power of load active power；
PQ inverse transformations are carried out to grid side electric current and asks for iSαAnd iSβ
Wherein, PL(ω t) is obtained after the effect of LPF (Low-pass filter) link To load wink
When active power mean power；
Current compensation instruction is compensated under final actual working stateFor：
Preferably, in step S4, including following sub-step：
S41. active power filtering control unit, adjacent three control moment (k-1), k and (k+1) according to monitoring modular collection
When active filter DC bus capacitor C on magnitude of voltage Udc(k-1)、Udc(k) and Udc(k+1)；
S42. by expression formulaWith
After asking for capacitive energy variation delta W (k+1) and Δ W (k) of DC side in two neighboring controlling cycle, using adjacent control week
Phase TkInterior electric capacity active power fluctuation Δ PdcFor a steady state value andThese constraints are closed
System, substitutes into equationAsk for active filter in k-th controlling cycle
Active power p that wave apparatus absorbdc(k)；
The load current i at the k moment for S43. being obtained by data acquisitionLα(k) and single-phase mains voltage uSα(k), using number
Letter lock phase ring forms delayed iLα(k) and uSαVirtual amount i of (k) pi/2Lβ(k) and uSβ(k)；Using pL(k)=uSα(k)iLa(k)+
uSβ(k)iLβK () calculates the instantaneous active power p of k moment load-sidesL(k)；P is obtained using LPF algorithmLThe direct current of (k)
Component
S44. equation is utilized
Obtain the given instruction of electric current loop With the electricity that the k moment active filters for obtaining are gathered through low pass filter
Stream output valve iCK () subtracts each other after, into digitlization PI controllers；
S45.PI controllers output valve and uSαK () subtracts each other after, the modulated signal of single-phase full bridge inversion unit is formed, by modulating
The driving pulse of signal generation single-phase full bridge inversion unit.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The present invention be embodied as be confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of without departing from present inventive concept, some equivalent substitutes or obvious modification are made, and performance or purposes are identical, all should
It is considered as belonging to protection scope of the present invention.
Claims (7)
1. it is a kind of can intelligent filter compensation distribution system, the distribution system includes：
Feeder line, the feeder line is multiple, for providing electric energy for multiple loads；
Active filter, for providing reactive power for feeder line, to maintain stablizing for feeder line voltage, the active filter
Wave apparatus are multiple, and are corresponded with the feeder line；
Grid-connecting apparatus, for realizing that active filter and feeder line are incorporated into the power networks, the grid-connecting apparatus and the feeder line
Correspond；
And supervising device；
The supervising device includes：
Monitoring modular, control module and the communication bus for each module communication；
The monitoring modular, for real-time monitoring distribution system parameter, active filter parameter, the distribution system parameter bag
Include distribution system admittance, grid-connected end passive device equivalent admittance, harmonic load passive equivalence admittance, distribution system frequency, distribution
System voltage, electric current, the active filter parameter includes electric current loop disturbance gain, electric current loop open-loop branch gain；
The control module includes determination of stability unit and active power filtering control unit, wherein：
The determination of stability unit, based on the global admittance of distribution system the stability of system is judged；
The active power filtering control unit, using single closed-loop control harmonic filtration and compensation are realized.
2. the system as claimed in claim 1, it is characterised in that the determination of stability unit, the distribution system parameter, has
Source filter parameter sets up electric current loop admittance model, harmonic controling ring admittance model, according to the electric current loop admittance model with
And harmonic controling ring admittance model, obtain the full form of admittance equivalent circuit of distribution system, including standby mode of operation and compensation fortune
Row mode.
3. system as claimed in claim 2, it is characterised in that determination of stability unit is according to the full form of admittance equivalent electric
Rood is incorporated into the power networks to distribution system under two kinds of operational modes and locates the expression formula of voltage, wherein YtotalLead for the distribution system overall situation
Receive：
Standby mode of operation：
Compensation operational mode：
In formula, E is power distribution system voltage, and E' is incorporated into the power networks place's voltage for distribution system, YgFor distribution system admittance, YpFor grid-connected
End passive device equivalent admittance, YiFor electric current loop admittance, YhiFor harmonic controling ring admittance, YLLead for harmonic load passive equivalence
Receive, I 'iFor active filter equivalent current source during standby operation (i=1,2 ... n), n be distribution system active filter
Quantity, I 'hiSource filter equivalent current source, I when running for harmonic compensationLhFor harmonic current source.
4. system as claimed in claim 3, it is characterised in that determination of stability unit judges according to distribution system overall situation admittance
The stability of distribution system；The stability of the distribution system is that all responses of the distribution system under current steady excitation are steady
Fixed, the excitation includes distribution voltage, active filter output current source and load harmonic current source, and the response includes matching somebody with somebody
Electric system is incorporated into the power networks and locates voltage, active filter output current and parallel passive device current.
5. system as claimed in claim 4, it is characterised in that the side of the stability of determination of stability unit judges distribution system
Method is：According to the distribution system overall situation admittance Y for obtainingtotalNyquist curves are drawn, negative the positive and negative of real axis of s planes is obtained and is passed through
Number of times；If global admittance YtotalCorresponding Nyquist curves are equal in the positive and negative traversing times of the negative real axis of s planes, then the distribution
System stability；Conversely, distribution system unstability.
6. system as claimed in claim 4, it is characterised in that the side of the stability of determination of stability unit judges distribution system
Method is：According to distribution system the overall situation admittance frequency domain gain be zero when, distribution system resonance point is determined, if the corresponding gain of resonance point
Real part RdAll greater than zero, then the distribution system is stablized；Conversely, distribution system unstability.
7. the system as described in claim 1-6 is arbitrary, it is characterised in that active power filtering control unit, according to monitoring modular collection
Magnitude of voltage U on adjacent three control moment (k-1), k and active filter DC bus capacitor C when (k+1)dc(k-1)、Udc(k)
And Udc(k+1), by expression formulaWith
After asking for capacitive energy variation delta W (k+1) and Δ W (k) of DC side in two neighboring controlling cycle, using adjacent control week
Phase TkInterior electric capacity active power fluctuation Δ PdcFor a steady state value andThese constraints are closed
System, substitutes into equationAsk for active filter in k-th controlling cycle
Active power p that wave apparatus absorbdc(k)；The load current i at the k moment obtained by data acquisitionLα(k) and single-phase mains voltage uSα
K (), using digital phase-locked loop delayed i is formedLα(k) and uSαVirtual amount i of (k) pi/2Lβ(k) and uSβ(k)；Using pL(k)=uSα(k)iLa
(k)+uSβ(k)iLβK () calculates the instantaneous active power p of k moment load-sidesL(k)；P is obtained using LPF algorithmLThe direct current of (k)
ComponentUsing equation
Obtain the given instruction of electric current loopWith the electricity that the k moment active filters for obtaining are gathered through low pass filter
Stream output valve iCK () subtracts each other after, into digitlization PI controllers；PI controllers output valve and uSαK () subtracts each other after, form single-phase complete
The modulated signal of bridge inversion unit, by modulated signal the driving pulse of single-phase full bridge inversion unit is generated.
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| CN201611109970.0A CN106655184A (en) | 2016-12-06 | 2016-12-06 | Power distribution system capable of intelligent filtering compensation |
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| CN201611109970.0A CN106655184A (en) | 2016-12-06 | 2016-12-06 | Power distribution system capable of intelligent filtering compensation |
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| CN105680450A (en) * | 2016-02-29 | 2016-06-15 | 东南大学 | Global admittance analysis based stability determination method of APF parallel operation system |
| CN105977979A (en) * | 2016-01-18 | 2016-09-28 | 广东工业大学 | Single-loop control algorithm of single-phase shunt active power filter |
| CN105977992A (en) * | 2016-06-22 | 2016-09-28 | 成都欣维保科技有限责任公司 | Distribution system adjusting reactive power output intelligently based on load change |
| CN106026098A (en) * | 2016-07-06 | 2016-10-12 | 国网山东省电力公司无棣县供电公司 | Hybrid active filtering compensation apparatus for three-phase power grid, and control method thereof |
| CN205992734U (en) * | 2016-03-25 | 2017-03-01 | 中国电力科学研究院 | A kind of distribution network active filtering device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977979A (en) * | 2016-01-18 | 2016-09-28 | 广东工业大学 | Single-loop control algorithm of single-phase shunt active power filter |
| CN105680450A (en) * | 2016-02-29 | 2016-06-15 | 东南大学 | Global admittance analysis based stability determination method of APF parallel operation system |
| CN205992734U (en) * | 2016-03-25 | 2017-03-01 | 中国电力科学研究院 | A kind of distribution network active filtering device |
| CN105977992A (en) * | 2016-06-22 | 2016-09-28 | 成都欣维保科技有限责任公司 | Distribution system adjusting reactive power output intelligently based on load change |
| CN106026098A (en) * | 2016-07-06 | 2016-10-12 | 国网山东省电力公司无棣县供电公司 | Hybrid active filtering compensation apparatus for three-phase power grid, and control method thereof |
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Application publication date: 20170510 |