CN106505574A - A kind of operation method of the distribution system with filter - Google Patents
A kind of operation method of the distribution system with filter Download PDFInfo
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- CN106505574A CN106505574A CN201611109969.8A CN201611109969A CN106505574A CN 106505574 A CN106505574 A CN 106505574A CN 201611109969 A CN201611109969 A CN 201611109969A CN 106505574 A CN106505574 A CN 106505574A
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- distribution system
- admittance
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- filter
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
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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
- Y02E40/20—Active power filtering [APF]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of operation method of the distribution system with filter, can accurately, comprehensively carry out active filter distribution system determination of stability, the control structure of active filter can be become by the twin nuclei of traditional control electric current and voltage only needs the interior ring structure of control electric current, thus sets the technical characteristic of simple, system dynamics fast response time and strong robustness with control parameter.
Description
Art
The present invention relates to a kind of operation method of the distribution system with filter.
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 in countries in the world to each power quality index, 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 the active filter of modularity multi-machine parallel connection to 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 electrical network in harmonic wave, idle carry out quick response,
And increasingly receive publicity.And 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
The virtual value for how quickly obtaining unbalanced component in uncompensated load becomes the key for calculating limiting figure.
Active filter is due to suppressing grid current harmonic, compensating power, it is to avoid because harmonic wave causes with dynamic
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 loads 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.
Content of the invention
The present invention provides a kind of operation method of the distribution system with filter, accurately, comprehensively can be had
Source filter distribution system determination of stability, can be by the control structure of active filter by traditional control electric current and electricity
The twin nuclei of pressure becomes the interior ring structure for only needing control electric current, thus there is control parameter to set simple, system dynamics and ring
Answer speed fast and strong robustness technical characteristic.
To achieve these goals, the present invention provides a kind of operation method of the distribution system with filter, the party
Method comprises 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 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 in k-th controlling cycle
Active power p that filter absorbsdc(k)；
The load current i at the k moment for S43. being obtained by data acquisitionLα(k) and single-phase mains voltage uSαK (), using number
Letter lock phase ring forms delayed iLα(k) and uSαThe virtual 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 low-pass filtering algorithmLThe direct current of (k)
Component
S44. using equation
Obtain the given instruction of electric current loopWith the electricity for gathering the k moment active filters for obtaining through low pass filter
Stream output valve iCK () subtracts each other after, digitized PI controllers are entered；
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.
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 stable, and the excitation includes distribution voltage, active
It is incorporated into the power networks including distribution system and locates voltage, active filter in filter output current source and load harmonic current source, the response
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 YtotalRight
The Nyquist curves that answers are equal in the positive and negative traversing times of the negative real axis of s planes, then the distribution system is stable；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 stable；Conversely, distribution system unstability.
The invention has the advantages that：(1) can Intelligent Recognition 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 of distributed active filter and economic benefit.
Description of the drawings
Fig. 1 show the present invention 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 a kind of can intelligent filter compensation distribution system, the distribution system includes：
Feeder line 14, the feeder line are 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 14 voltage of feeder line
Fixed, the active filter is multiple, and corresponds 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 include 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, judges the stability of system based on the global admittance of distribution system；
The active power filtering control unit, realizes harmonic filtration and compensation using single closed loop control.
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；Described match somebody with somebody
The stability of electric system is that all responses of the distribution system under current steady excitation are stable, the 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 YtotalRight
The Nyquist curves that answers are equal in the positive and negative traversing times of the negative real axis of s planes, then the distribution system is stable；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 stable；Conversely, distribution system unstability.
Preferably, active power filtering control unit, adjacent three control moment (k-1), k and (k according to 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) of DC side and Δ W (k), 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 uSαK (), utilizes
Digital phase-locked loop forms delayed iLα(k) and uSαThe virtual 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 low-pass filtering algorithmLThe direct current of (k)
ComponentUsing equationObtain
Obtain the given instruction of electric current loopWith the electric current for gathering the k moment active filters for obtaining through low pass filter
Output valve iCK () subtracts each other after, digitized PI controllers are entered；PI controllers output valve and uSαK () subtracts each other after, single-phase full bridge is formed
The modulated signal of inversion unit, the driving pulse that single-phase full bridge inversion unit is generated by modulated signal.
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 stable, and the excitation includes distribution voltage, active
It is incorporated into the power networks including distribution system and locates voltage, active filter in filter output current source and load harmonic current source, the response
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 YtotalRight
The Nyquist curves that answers are equal in the positive and negative traversing times of the negative real axis of s planes, then the distribution system is stable；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 stable；Conversely, distribution system unstability.
Preferably, in step S4, determined by following steps
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 biphase orthogonal α β coordinate systems, 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 contrast；inFor iLIn nth harmonic amplitude；For iLIn n time
Harmonic wave and usPhase contrast, wherein, angular frequency is obtained by the effect of single-phase PLL (Phase locked loop) link
's；
The instantaneous active that single-phase grid side and load-side are asked for 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；
Consider in actual applications, active filter always has some loss (such as major loop components and parts heat wastes
Consumption and the loss of 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 pdcFor maintaining the musted wattful power absorbed from single-phase electrical network of active filter DC voltage
Rate,Concussion power for 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) linkFor load
The mean power of instantaneous active 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 in k-th controlling cycle
Active power p that filter absorbsdc(k)；
The load current i at the k moment for S43. being obtained by data acquisitionLα(k) and single-phase mains voltage uSαK (), using number
Letter lock phase ring forms delayed iLα(k) and uSαThe virtual 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 low-pass filtering algorithmLThe direct current of (k)
Component
S44. using equation
Obtain the given instruction of electric current loopWith the electricity for gathering the k moment active filters for obtaining through low pass filter
Stream output valve iCK () subtracts each other after, digitized PI controllers are entered；
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 further description made for the present invention with reference to specific preferred implementation, 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 is made, and performance or purposes are identical, all should
It is considered as belonging to protection scope of the present invention.
Claims (6)
1. a kind of flow chart of the operation method of the distribution system with filter, 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.
2. the method for claim 1, it is characterised in that in step S4, including following sub-step：
When S41. active power filtering control unit, adjacent three control moment (k-1), k and (k+1) according to monitoring modular collection
Magnitude of voltage U on active filter DC bus capacitor Cdc(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 in k-th controlling cycle
Active power p that filter absorbsdc(k)；
The load current i at the k moment for S43. being obtained by data acquisitionLα(k) and single-phase mains voltage uSαK (), using digital phase-locking
Phase ring forms delayed iLα(k) and uSαThe virtual 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 low-pass filtering algorithmLThe DC component of (k)
S44. using equation
Obtain the given instruction of electric current loopWith the electricity for gathering the k moment active filters for obtaining through low pass filter
Stream output valve iCK () subtracts each other after, digitized PI controllers are entered；
S45.PI controllers output valve and uSαK () subtracts each other after, the modulated signal of single-phase full bridge inversion unit is formed, by modulated signal
Generate the driving pulse of single-phase full bridge inversion unit.
3. method as claimed in claim 2, it is characterised in that in step sl, the distribution system parameter includes power distribution system
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 include electric current loop disturbance gain, electric current loop open-loop branch gain.
4. method as claimed in claim 3, it is characterised in that in step S2, including following sub-step：
S21. set up electric current loop admittance model, harmonic controling ring according to the distribution system parameter, active filter parameter to lead
Receive model；
S22. according to the electric current loop admittance model and harmonic controling ring admittance model, full form of admittance of distribution system etc. is obtained
Effect circuit, including standby mode of operation and compensation operational mode；
S23. obtain distribution system under two kinds of operational modes according to the full form of admittance equivalent circuit to be incorporated into the power networks place's voltage
Expression formula, 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, 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；
S24. determination of stability unit judges the stability of distribution system according to distribution system overall situation admittance；The distribution system
Stability is that all responses of the distribution system under current steady excitation are stable, and the excitation includes distribution voltage, active power filtering
It is incorporated into the power networks including distribution system and locates voltage, active power filtering dress in device output current source and load harmonic current source, the response
Put output current and parallel passive device current.
5. method 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. method 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, determine distribution system resonance point, if the corresponding gain of resonance point
Real part RdAll greater than zero, then the distribution system is stable；Conversely, distribution system unstability.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769205A (en) * | 2017-10-30 | 2018-03-06 | 许继电源有限公司 | A kind of Active Power Filter-APF resonance suppressing method and device |
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