CN106998071A - A kind of MMC STATCOM unbalanced load compensating control methods based on bridge arm current - Google Patents
A kind of MMC STATCOM unbalanced load compensating control methods based on bridge arm current Download PDFInfo
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase 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
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- 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
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses the invention discloses a kind of MMC STATCOM unbalanced load compensating control methods based on bridge arm current, to out-of-balance current real-time tracking, quick response, both idle and negative sequence component in power network current can be compensated, the balance that out-of-balance current inside MMC maintains submodule capacitor voltage can be suppressed again, the efficiency of transverter operation is improved while MMC stable operations are ensured, is adapted to any phase MMC, and strong robustness, to overcome the shortcomings of currently available technology.
Description
Technical field
It is particularly a kind of based on bridge arm electricity the present invention relates to the STATCOM based on modularization multi-level converter
The MMC-STATCOM unbalanced load compensating control methods of stream, belong to technical field of electric power.
Background technology
The state of unbalanced source voltage, such as single-phase load (single-phase electricity occur in actual low and medium voltage distribution network field
Trailer system, communal facility load and rural area electrical system etc.) mal-distribution can cause the imbalance of power network level, produce
Negative sequence component influences the transmission of the quality of power supply.The imbalance of load also brings along the decline of power factor (PF) simultaneously, in power system
The increase of line loss and fuel factor.Therefore the condition development to improve power network can be to idle and negative-sequence current comprehensive compensation device very
It is important.At present, voltage source Static Synchronous reactive-load compensator (STATCOM) relative to other compensators due to its fast response time and
The compensation of dynamic, being widely used in needs reactive-load compensation and alleviates because voltage pulsation caused by electric network fault and compensation are uneven
Load the application scenarios such as the negative-sequence current of generation.And the STATCOM based on MMC has modularized design, is easy to extension and low humorous
The advantages of ripple is exported, has good effect for the compensation of unbalanced load, a kind of good compensation device of can yet be regarded as.
Modularization multi-level converter (MMC) is formed in parallel by the upper and lower bridge arm of three-phase, and each bridge arm is by equal half-H-bridge
Submodule is in series with inductance, and half-bridge submodule is as shown in Figure 2.Using rational modulation strategy, control submodule electric capacity
Input is cut off, and it is in many level waveforms to make MMC output voltages, and the waveform of the more MMC outputs of the more i.e. level numbers of submodule number is more
Close to ideal sinusoidal waveform.By adjusting the amplitude and phase angle of MMC output voltages, the idle and negative phase-sequence of transverter output can control
Electric current, dynamically to compensate unbalanced load.Because MMC three-phase common DCs side forms alternate circulation flow path, nature three is realized
The balance of phase power, therefore relative to other chain type STATCOM, this is the reason for MMC-STATCOM can realize unbalanced load.
Currently focused primarily upon for the control of MMC out-of-balance currents and divided MMC ac-side currents and MMC inner loop streams
Open control.The control of MMC ac-side currents need to separate the positive and negative order components of electric current and double synchronous rotaries using double vector current ring controls
Coordinate system, and multichannel PI parameters adjust, and both increase the complexity of control design case system.Meanwhile, in actual motion, due to each
Fang Yinsu MMC submodule capacitor voltage can not possibly be identical, during especially MMC-STATCOM compensation unbalanced loads, meeting
MMC is caused to produce alternate circulation AC compounent.The method that existing document suppresses circulation mainly has the reactance of increase bridge arm, bicyclic circulation
Component PI controls etc., such method is based on increase system cost or the overall control structure complexity of heavy system.Study a kind of base
It is extremely important in MMC STATCOM unbalanced load comprehensive compensation strategies, and use the control method based on MMC bridge arm currents
MMC ac-side currents and circulation are uniformly controlled and simplify overall control structure, while in the case where ensureing MMC steady-state operating conditions
The tracing control to comprehensive compensation current-order can be realized very well.
The content of the invention
The technical problems to be solved by the invention are, in view of the shortcomings of the prior art, proposing a kind of based on bridge arm current
MMC-STATCOM unbalanced load compensating control methods, circulation inside MMC ac-side currents and MMC is uniformly controlled, simplifies control
System overall complexity processed, it is ensured that comprehensive compensation of the energy faster response to unbalanced load while MMC steady-state operations.
To solve above-mentioned technical problem, the technical solution adopted in the present invention is：
A kind of MMC-STATCOM unbalanced load compensating control methods based on bridge arm current, comprise the following steps：
The first step, detection unbalanced load electric current iLa、iLb、iLc, isolate and be based on by positive sequence Park conversion and trapper
The idle and negative sequence compensation instruction of loadIts mathematic(al) representation is：
In formula：The respectively negative phase-sequence watt current of unbalanced load and negative phase-sequence reactive current；For imbalance
The positive sequence active component of load.
Second step, all submodule capacitor voltages are detected again, after summation divided by 3 obtain MMC DC side average voltages udc, will
The DC side average voltage u of gaineddcWith reference voltageAfter subtracting each other, device is controlled to adjust by PI and obtains a pressure regulation instruction letter
Number
3rd step, generalObtained by dq/abc changes in coordinatesWith
4th step, MMC three-phase output voltages are multiplied with corresponding output current and pass through trapper, obtain each phase bridges of MMC
The average value p that arm is exchanged with three phase network active poweroa、pobAnd poc, by average value poa、pobAnd pocDivided by DC voltage ginseng
Examine valueObtain the set-point i* of the phase circulations of MMC tri-dca、i*dcbAnd i*dcc；
5th step, circulation instruction is added in the current-order of MMC three-phase alternating currents side and obtains the upper and lower bridge of MMC three-phases respectively
The instruction current of arm, its mathematic(al) representation is；
6th step, the upper and lower bridge arm current i of detection MMC three-phasespa、ipb、ipcAnd ina、inb、inc, with corresponding upper and lower bridge arm
Current instruction value subtracts each other carries out DAZ gene by quasi- PR controllers under three phase static coordinate；
7th step, the upper and lower bridge arm modulation voltage of final MMC three-phases is drawn, its mathematic(al) representation is：
In formula, k=a, b, c, uskFor line voltage；
8th step, using phase-shifting carrier wave pulse duration modulation method upper and lower bridge arm modulation voltage and carrier wave are modulated, obtained
The switching signal of each half-bridge submodule of the upper and lower bridge arm of MMC three-phases, drives the switch arm of submodule defeated to obtain desired voltage
Go out.
The submodule is made up of 2 IGBT, two antiparallel diodes and 1 shunt capacitance.
The set of frequency of described trapper is 100HZ.
Described quasi- its resonant frequency of PR controllers is made up of fundamental frequency and two frequency multiplication two parts.
Compared with prior art, beneficial effects of the present invention：
The method of the present invention can realize the change of the quick tracking unbalanced load to STATCOM, compensating reactive power and negative phase-sequence
Electric current, it is ensured that the balance of line voltage and the transmission of unity power factor electric energy.
(1) it is uniformly controlled using to circulation inside MMC ac-side currents and MMC.Relative to the control of other balanced balanced currents
Method, even if when line voltage is likely to occur unbalanced state constantly, ac-side current need not be plus double vector current rings
Control, the controller that MMC inside loop current suppression need not increase extra other Circulation Components is worked as.
(2) it is uniformly controlled using to circulation inside MMC ac-side currents and MMC.Relative to other out-of-balance current controls
Method processed, simplifies the separation of ac-side current component different with circulation inside MMC, and double synchronous coordinate changes are active and idle
Decoupling and multichannel PI parameter tunings etc., make MMC-STATCOM control structures simple, and be easily achieved.
The method of the present invention can compensate the reactive component and negative sequence component of unbalanced load, can suppress the alternate rings of MMC again
Two double-frequency fluctuations of stream, it is ensured that the equilibrium of MMC submodule capacitor voltages, are suitable for the modular multilevel of any phase, robustness
By force.
Brief description of the drawings
Fig. 1 is MMC-STATCOM structural representations；
Fig. 2 is MMC half-bridge sub-modular structure schematic diagrames；
Schematic diagram is extracted in the instruction of Fig. 3 MMC ac-side currents；
Circulation command value extracts schematic diagram inside Fig. 4 MMC；
Fig. 5 MMC bridge arm currents are uniformly controlled structural representation；
Fig. 6 is load three-phase current comparison diagram；
Fig. 7 is power network current comparison diagram.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, but not as any limitation of the invention.
Referring to shown in Fig. 1-6, method of the invention is based on MMC bridge arm currents and reached using unified current controller to MMC-
Control, specifically introduced below in conjunction with accompanying drawing while STATCOM ac-side currents and MMC inside out-of-balance current.
Fig. 1 is MMC-STATCOM structure charts, sets up KVL equations, can obtain
Define upper and lower bridge arm voltage epk、enkDifference obtains half for MMC output voltages ek, (k=a, b, c, similarly hereinafter)
Define upper and lower bridge arm current iap、ianFor the half and out-of-balance current sum inside MMC of MMC ac-side currents
It is that schematic block diagram is extracted in the instruction of MMC ac-side currents with reference to Fig. 3, reactive current is proposed from unbalanced load and negative
Sequence electric current, so as to realize the balance to line voltage, reduces the loss of electric energy transmission as the reference value of MMC output currents.It is logical
Cross detection load current iLa、iLb、iLc, reactive current and negative phase-sequence that PARK and two double frequency wave traps are isolated are converted by positive sequence
Electric current is respectively as the MMC output currents under dq coordinatesReference value.And in practice there is loss in MMC itself,
In order to maintain the stabilization of MMC submodule capacitor voltages, the control to MMC DC voltages is realized using PI controllers：
In formula,It is for PI output signalsReference value, kp、kiRespectively ratio and integral coefficient,udcPoint
The DC side reference value and actual value that Wei do not tried to achieve by MMC submodule capacitor voltages.
It is that circulation command value extracts block diagram inside MMC with reference to Fig. 4, MMC three-phase alternating currents side output current i will be detectedca、
icb、iccWith line voltage usa、usb、uscIt is multiplied and passes through two double frequency wave traps, obtains each phase bridge arms of MMC and three phase network wattful power
The average value p that rate is exchangedoa、pobAnd poc, divided by DC voltage reference valueObtain the set-point i* of the phase circulations of MMC tri-dca、
i*dcbAnd i*dcc；
WillWithObtained by dq/abc changes in coordinatesWithAccordingly add MMC circulation
Reference value, obtain the command value of the upper and lower bridge arms of MMC：
It is that MMC bridge arm currents are uniformly controlled structured flowchart with reference to Fig. 5, MMC-STATCOM output current is tracked MMC bridges
The command value of arm electric current, so as to realize the electric energy transmission of unit factor and solve unbalanced source voltage phenomenon, and can guarantee that MMC
Stable operation.As shown in Figure 1, by adjusting MMC output voltage uck, realize the control to MMC output currents.And MMC's is defeated
Go out voltage uckFor the half of the difference of the upper and lower bridge arm voltages of MMC, that is, adjust the upper and lower bridge arm voltage e of MMCpk、enkJust it can control MMC
Output current.
Composite type (1)~(7), the reference value that can obtain the upper and lower bridge arm voltages of MMC is respectively：
The upper and lower bridge arm voltage reference value of MMC three-phases is normalized, then using phase shift carried based PWM (CPS-
PWM), the switching signal s of the upper and lower bridge arm submodule of MMC three-phases is obtainedapk、sbpk、scpkAnd sank、sbnk、scnk, drive MMC submodules
The turn-on and turn-off of the upper and lower switching tube of block obtain the output of desired voltage, so that real in the state of MMC stable operations are ensured
Comprehensive compensations of the existing MMC-STATCOM to unbalanced load.
Fig. 6 is load three-phase current and power network current comparison diagram, and Fig. 6 is threephase load electric current iLa、iLb、iLc, Fig. 7 is three
Phase power network current isa、isb、isc.Therefrom find out that not carry out three-phase current in comprehensive compensation, power network asymmetric, uneven degree compared with
Height, is added after compensation, and power network current comprises only fundamental wave and three-phase keeps balance.And based on the control strategy of MMC bridge arm currents, its
Out-of-balance current is also well controlled inside MMC, demonstrates the validity of the unified current controller of the present invention.
A kind of MMC-STATCOM unbalanced load compensating control methods based on bridge arm current that the present invention is provided, to not
Balanced balanced current real-time tracking, quick response can both be compensated, and can suppress to idle and negative sequence component in power network current
Out-of-balance current maintains the balance of submodule capacitor voltage inside MMC, and transverter is improved while MMC stable operations are ensured
The efficiency of operation, is adapted to any phase MMC, and strong robustness.
Claims (4)
1. a kind of MMC-STATCOM unbalanced load compensating control methods based on bridge arm current, it is characterised in that including following
Step：
The first step, detection unbalanced load electric current iLa、iLb、iLc, isolated by positive sequence Park conversion and trapper based on load
The instruction of idle and negative sequence compensationIts mathematic(al) representation is：
In formula：The respectively negative phase-sequence watt current of unbalanced load and negative phase-sequence reactive current；For unbalanced load
Positive sequence active component.
Second step, all submodule capacitor voltages are detected again, after summation divided by 3 obtain MMC DC side average voltages udc, by gained
DC side average voltage udcWith reference voltageAfter subtracting each other, device is controlled to adjust by PI and obtains a pressure regulation command signal
3rd step, generalWithObtained by dq/abc changes in coordinatesWith
4th steps, MMC three-phase output voltages are multiplied with corresponding output current and pass through trapper, obtain each phase bridge arms of MMC with
The average value p that three phase network active power is exchangedoa、pobAnd poc, by average value poa、pobAnd pocDivided by DC voltage reference valueObtain the set-point i of the phase circulations of MMC tri-* dca、i* dcbAnd i* dcc；
5th step, circulation instruction is added in the current-order of MMC three-phase alternating currents side and obtains the upper and lower bridge arm of MMC three-phases respectively
Instruction current, its mathematic(al) representation is；
6th step, the upper and lower bridge arm current i of detection MMC three-phasespa、ipb、ipcAnd ina、inb、inc, with corresponding upper and lower bridge arm current
Command value is subtracted each other carries out DAZ gene by quasi- PR controllers under three phase static coordinate；
7th step, the upper and lower bridge arm modulation voltage of final MMC three-phases is drawn, its mathematic(al) representation is：
In formula, k=a, b, c, uskFor line voltage；
8th step, using phase-shifting carrier wave pulse duration modulation method upper and lower bridge arm modulation voltage and carrier wave are modulated, obtain MMC
The switching signal of each half-bridge submodule of the upper and lower bridge arm of three-phase, drives the switch arm of submodule to obtain desired voltage output.
2. the MMC-STATCOM unbalanced load compensating control methods according to claim 1 based on bridge arm current, it is special
Levy and be, the submodule is made up of 2 IGBT, two antiparallel diodes and 1 shunt capacitance.
3. the MMC-STATCOM unbalanced load compensating control methods according to claim 1 based on bridge arm current, it is special
Levy and be, the set of frequency of described trapper is 100HZ.
4. the MMC-STATCOM unbalanced load compensating control methods according to claim 1 based on bridge arm current, it is special
Levy and be, described quasi- its resonant frequency of PR controllers is made up of fundamental frequency and two frequency multiplication two parts.
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Cited By (8)
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| CN109039124A (en) * | 2018-08-13 | 2018-12-18 | 南昌工程学院 | MMC capacitance voltage balance control method based on phase shift space vector modulation |
| CN109038640A (en) * | 2018-08-13 | 2018-12-18 | 深圳供电局有限公司 | A kind of UPFC series side inverter constant volume method based on Phasor graphical method |
| CN109494710A (en) * | 2018-10-15 | 2019-03-19 | 广东安朴电力技术有限公司 | A kind of phase modulation regulator, the system and method for cyclization turn power supply |
| CN110190612A (en) * | 2019-04-26 | 2019-08-30 | 宁波三星智能电气有限公司 | Platform area three-phase imbalance administering method based on geographical location and phase identification |
| CN110445148A (en) * | 2019-08-13 | 2019-11-12 | 南昌工程学院 | A kind of proportional resonant control method of high-voltage chain type STATCOM |
| CN110850237A (en) * | 2019-12-03 | 2020-02-28 | 西安交通大学 | Direct current single-end-quantity fault positioning system and method based on active detection |
| CN111030131A (en) * | 2019-12-12 | 2020-04-17 | 太原理工大学 | MMC-STATCOM circulating current suppression device based on negative sequence virtual impedance |
| WO2020259211A1 (en) * | 2019-06-26 | 2020-12-30 | 中电普瑞电力工程有限公司 | Hybrid mmc control method and system |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039124B (en) * | 2018-08-13 | 2020-06-09 | 南昌工程学院 | MMC capacitor voltage balance control method based on phase-shift space vector modulation |
| CN109038640A (en) * | 2018-08-13 | 2018-12-18 | 深圳供电局有限公司 | A kind of UPFC series side inverter constant volume method based on Phasor graphical method |
| CN109038640B (en) * | 2018-08-13 | 2021-12-03 | 深圳供电局有限公司 | Capacity determining method for UPFC serial side converter based on phase diagram method |
| CN109039124A (en) * | 2018-08-13 | 2018-12-18 | 南昌工程学院 | MMC capacitance voltage balance control method based on phase shift space vector modulation |
| CN109494710A (en) * | 2018-10-15 | 2019-03-19 | 广东安朴电力技术有限公司 | A kind of phase modulation regulator, the system and method for cyclization turn power supply |
| CN110190612A (en) * | 2019-04-26 | 2019-08-30 | 宁波三星智能电气有限公司 | Platform area three-phase imbalance administering method based on geographical location and phase identification |
| CN110190612B (en) * | 2019-04-26 | 2022-06-03 | 宁波三星智能电气有限公司 | Three-phase unbalance management method for transformer area based on geographical position and phase identification |
| WO2020259211A1 (en) * | 2019-06-26 | 2020-12-30 | 中电普瑞电力工程有限公司 | Hybrid mmc control method and system |
| CN110445148A (en) * | 2019-08-13 | 2019-11-12 | 南昌工程学院 | A kind of proportional resonant control method of high-voltage chain type STATCOM |
| CN110850237B (en) * | 2019-12-03 | 2020-10-27 | 西安交通大学 | Direct current single-end-quantity fault positioning system and method based on active detection |
| CN110850237A (en) * | 2019-12-03 | 2020-02-28 | 西安交通大学 | Direct current single-end-quantity fault positioning system and method based on active detection |
| CN111030131A (en) * | 2019-12-12 | 2020-04-17 | 太原理工大学 | MMC-STATCOM circulating current suppression device based on negative sequence virtual impedance |
| CN111030131B (en) * | 2019-12-12 | 2023-03-21 | 太原理工大学 | MMC-STATCOM circulating current suppression device based on negative sequence virtual impedance |
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