CN105762827A - Method for suppressing propagation of AC unbalanced voltage between voltage source type converter stations - Google Patents

Method for suppressing propagation of AC unbalanced voltage between voltage source type converter stations Download PDF

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Publication number
CN105762827A
CN105762827A CN201610248881.8A CN201610248881A CN105762827A CN 105762827 A CN105762827 A CN 105762827A CN 201610248881 A CN201610248881 A CN 201610248881A CN 105762827 A CN105762827 A CN 105762827A
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voltage
submodule
fault
current conversion
conversion station
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鲁江
李钢
董云龙
胡兆庆
王柯
卢宇
谢晔源
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • 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
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The invention discloses a method for suppressing propagation of AC unbalanced voltage between voltage source type converter stations. The method includes the steps: detecting the unbalanced voltage including the zero sequence voltage at the AC side of a voltage source type converter station or the DC side of the voltage source type converter station; and when the unbalanced voltage occurs, enabling a converter to generate a suitable voltage reference wave to match the AC practical voltage to suppress the DC voltage fluctuation caused by the unbalanced voltage and propagation of the unbalanced voltage to a non-fault station AC system. The method can be implemented by configuring a certain number of redundancy standby sub modules for the converter or controlling the working voltage of the capacitors of the sub modules or by means of integrated operation of the two modes. The invention also discloses the corresponding configuration for the sub modules of the converter, and a working voltage method for the capacitors of the sub modules.

Description

Suppress the method that exchange unbalance voltage is propagated between voltage-source type current conversion station
Technical field
The invention belongs to Power System Flexible AC-HVDC technical field, be specifically related to a kind of method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station.
Background technology
Flexible AC-HVDC technology adopts voltage source converter, it is possible to independent regulation active power and reactive power, controls flexible；Receiving-end system can be passive network, it is not necessary to additional commutation voltage；Reactive power need not be provided and the effect of reactive-load compensation can be played by AC, dynamic compensation ac bus reactive power, stablizing alternating voltage, being therefore one of the developing direction of electrical power system transmission.
Development based on the voltage source converter of modular multilevel technology (MMC), solve the voltage-sharing based on two Level Technology and the big problem of loss, reduce AC system harmonic wave simultaneously, make voltage source converter adopt transless mode incoming transport electrical network to become a kind of to be likely to, also make the overall investment of current conversion station and further minimizing of occupation of land be possibly realized.
When voltage source converter adopts transless mode incoming transport electrical network as shown in Figure 1, when AC system generation unbalanced fault, inverter cannot isolate the unbalance voltage that AC system produces, and is respectively provided with similar fault response characteristics for half-bridge as shown in Figure 2, class full-bridge with full-bridge MMC type voltage source converter.Such as at earth-free, high resistance ground or when the system generation singlephase earth fault of grounding through arc, ac grid voltage will appear from residual voltage, and cause each phase voltage occur imbalance, healthy phases voltage from phase voltage raise for line voltage (phase voltageTimes), the unbalance voltage of AC enters DC side through inverter and causes DC voltage fluctuation occur, this voltage pulsation is conducted to other current conversion stations through direct current cables or overhead transmission line, also there is imbalance in the alternating voltage causing non-faulting station the most at last, thus affecting the properly functioning of non-faulting station AC system.
Owing under having transformator access way, residual voltage can by transformer isolation at AC, will not conduct to DC side, therefore current control method is that the negative sequence voltage in unbalance voltage is controlled, and the residual voltage in unbalance voltage is not controlled." DualcurrentcontrolschemeforPWMconverterunderunbalanceinp utvoltageconditions " (IEEETranscationonIndustialElectronics.1999 of SongHong-Seok et al., 46 (5): 953-959) for unbalanced fault, carry out negative sequence voltage feedforward respectively and double; two sequence current inner loop controls, but negative-sequence current can only be suppressed.Positive-negative sequence unbalanced fault has been carried out detailed derivation by the flourish thesis for the doctorate in old sea " during fault in ac transmission system the control of VSC-HVDC system and Preservation tactics research "; adopting on the basis of double; two sequence electric current loop; the reference value of negative-sequence current is divided into again suppression AC negative phase-sequence and suppresses DC side two frequency multiplication, but the two target can not realize simultaneously.More than derive to calculate and be all controlled just for negative phase-sequence, and during for this station failure, residual voltage is transmitted to station and suppresses non-faulting station unbalance voltage not to be analyzed research.
" a kind of three level neutral-point potential balance control method based on injected zero-sequence voltage " patent (application number 201010100682.5) of Zhou Jinghua et al. application fluctuates for three level DC electric capacity neutral point voltage, calculate whether neutral point voltage balances by gathering dc bus side two capacitance voltage, three-phase current and neutral point current relation during by vector controlled under multi-carrier PWM modulation strategy, select that residual voltage is positive and negative is injected into three-phase modulations ripple, realize controlling neutral point potential balance, the DC capacitor voltage neutral point imbalance problem that its method and strategy cause just for three-level topology and employing PWM control algolithm, the unbalance voltage produced when can not solve AC system generation unbalanced fault is transmitted to the problem to station.
For how suppressing the propagation between voltage-source type current conversion station of unbalance voltage containing residual voltage under transless access way, have not yet to see effective solution, have impact on the application and popularization that adopt transless access way flexibility AC/DC Power System.Therefore, it is necessary to find a kind of method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station under transless mode, by detecting current conversion station AC or the DC side unbalance voltage containing residual voltage, produce suitable Voltage Reference ripple, match with AC actual voltage, suppress DC voltage fluctuation that unbalance voltage causes and to the propagation of non-faulting station AC system, it is ensured that the safe and stable operation of flexible AC/DC Power System and non-faulting station AC system.
Summary of the invention
Present invention aims to prior art deficiency, a kind of method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station is provided, by detecting current conversion station AC or the DC side unbalance voltage containing residual voltage, produce suitable Voltage Reference ripple, match with AC actual voltage, suppress DC voltage fluctuation that unbalance voltage causes and to the propagation of non-faulting station AC system, it is ensured that the safe and stable operation of flexible AC/DC Power System and non-faulting station AC system.
In order to reach above-mentioned purpose, the technical solution used in the present invention is:
A kind of method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station is provided, by detecting voltage-source type current conversion station AC or the DC side unbalance voltage containing residual voltage, when detecting that unbalance voltage occurs, inverter is made to produce suitable Voltage Reference ripple, match with AC actual voltage, suppress DC voltage fluctuation that unbalance voltage causes and to the propagation of non-faulting station AC system.
Above-mentioned suppresses in the method that exchange unbalance voltage is propagated between voltage-source type current conversion station, the generation method of the Voltage Reference ripple matched with AC actual voltage is, open sea wharf and interior circular current control the Voltage Reference ripple Uref producing to control based on positive-negative sequence, zero sequence voltage detection controls to produce residual voltage reference value Uo_ref, Voltage Reference ripple Uref deducts residual voltage reference value Uo_ref and generates the reference wave Uref_new matched with AC actual voltage, and current conversion station is controlled according to Uref_new.
The above-mentioned method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station, voltage waveform feature when it is in conjunction with AC fault, a number of redundancy spare module is configured for inverter, during simultaneous faults, the running voltage of submodule electric capacity remains unchanged, when making AC fault occur, inverter can export the reference wave matched with AC actual voltage, it is achieved the suppression to the exchange unbalance voltage containing residual voltage.
The above-mentioned method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station, voltage waveform feature when it is in conjunction with AC fault, do not increase the submodule number of inverter, by controlling to increase the running voltage of submodule electric capacity during fault, when making AC fault occur, inverter can export the reference wave matched with AC actual voltage, it is achieved the suppression to the exchange unbalance voltage containing residual voltage.
The above-mentioned method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station, voltage waveform feature when it is in conjunction with AC fault, integrated use is that inverter configures a number of redundancy spare module and by controlling to increase two kinds of methods of running voltage of submodule electric capacity during fault, when making AC fault occur, inverter can export the reference wave matched with AC actual voltage, it is achieved the suppression to the exchange unbalance voltage containing residual voltage.
The inverter sub-module types adopted in the above-mentioned method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station includes half-bridge MMC (modular multilevel), class full-bridge MMC and full-bridge MMC type structure etc..
The present invention also provides for a kind of current conversion station submodule configuration method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station, voltage waveform feature when it is in conjunction with AC fault carries out the calculating that inverter needs the submodule quantity of configuration, and carries out the configuration of inverter submodule according to result of calculation.During for ensureing AC fault generation, inverter can export the reference wave matched with AC actual voltage, and when DC voltage remains unchanged, the standby full-bridge submodule number of redundancy of minimum needs configuration isN number of, the configuration number of submodule when wherein N is properly functioning when being disregard redundancy submodule, modulation ratio when M is properly functioning.
The present invention also provides for a kind of current conversion station submodule electric capacity running voltage control method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station, voltage waveform feature when it is in conjunction with AC fault carries out submodule electric capacity running voltage during fault needs the calculating of the value increased, and carries out the control of submodule electric capacity running voltage during fault according to result of calculation.During for ensureing AC fault generation, inverter can export the reference wave matched with AC actual voltage, when the submodule number and DC voltage that do not increase inverter remain unchanged, the value that during fault generation, the minimum needs of submodule electric capacity running voltage increase isAnd to major generalIndividual submodule is configured to full-bridge submodule, all the other submodules can be half-bridge, class full-bridge or full-bridge submodule, wherein UavgFor submodule electric capacity running voltage time properly functioning, modulation ratio when M is properly functioning, the configuration number of submodule when N is properly functioning when being disregard redundancy submodule.
The present invention also provides for a kind of current conversion station submodule configuration suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station and electric capacity running voltage control method, voltage waveform feature when it is in conjunction with AC fault carries out submodule electric capacity running voltage during inverter needs the redundancy spare module number of configuration and fault needs the COMPREHENSIVE CALCULATING of value increased, and carries out the control of submodule electric capacity running voltage during the configuration of inverter submodule and fault according to result of calculation.
After adopting such scheme, the invention have the benefit that
(1) a kind of method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station provided by the invention, DC voltage fluctuation that AC fault under transless access way occurs the unbalance voltage at station to cause can be suppressed and to the propagation at non-faulting station, this station failure is made to be down to minimum to the adverse effect at other stations, it is ensured that the safe and stable operation of flexible AC/DC Power System and non-faulting station AC system.
(2) application and the popularization of the flexible AC/DC Power System of transless access way are facilitated views with.
Accompanying drawing explanation
Fig. 1 is that voltage source converter adopts transless mode to connect, 1 fault in ac transmission system k1 schematic diagram of standing.
Fig. 2 is the topology of voltage source converter in the present invention, and its Neutron module can be half-bridge (HBSM), full-bridge (FBSM) or class full-bridge (SFBSM).
Fig. 3 is the method block diagram generating the Voltage Reference ripple matched with AC actual voltage in a kind of method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station of the present invention.
Fig. 4 is earth-free, high resistance ground or the schematic diagram of the AC system generation singlephase earth fault through grounding through arc, wherein (a) be up under voltage vector diagram, b () is the voltage vector diagram under C phase singlephase earth fault, (c) be up under voltage oscillogram, (d) is the voltage oscillogram under C phase singlephase earth fault.
Detailed description of the invention
Below with reference to drawings and the specific embodiments, technical scheme is described in detail.
The present invention provides a kind of method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station, by detecting current conversion station AC or the DC side unbalance voltage containing residual voltage, when detecting that unbalance voltage occurs, inverter is made to produce suitable alternating voltage reference ripple, match with AC actual voltage, suppress DC voltage fluctuation that unbalance voltage causes and to the propagation of non-faulting station AC system.
In order to reach above-mentioned purpose, the solution of the present invention is:
The alternating voltage reference ripple produced by inverter controls the level that AC actual voltage when extremely occurring matches with AC fault, makes the exchange unbalance voltage containing residual voltage substantially not enter DC side.The generation method of the alternating voltage reference ripple that AC actual voltage when occurring with AC fault matches is such as shown in block diagram 3, open sea wharf and interior circular current control the Voltage Reference ripple Uref producing to control based on positive-negative sequence, zero sequence voltage detection controls to produce residual voltage reference value Uo_ref, Voltage Reference ripple Uref deducts residual voltage reference value Uo_ref and generates the reference wave Uref_new matched with AC actual voltage, and current conversion station is controlled according to Uref_new.
Zero sequence voltage detection controls to calculate residual voltage according to actual measurement alternating voltage UacA, UacB, UacC and actual measurement DC voltage, it is added actual measurement alternating voltage UacA, UacB, UacC to calculate divided by 3 and obtains AC zero sequence voltage Uo_ac, actual measurement both positive and negative polarity DC voltage Udp, Udn are added and obtain direct current residual voltage Uo_dc divided by 2 calculating；Residual voltage reference value both can select the AC zero sequence voltage Uo_ac that AC calculates, it is also possible to selects the direct current residual voltage Uo_dc that DC side calculates, it is also possible to selects AC and DC residual voltage to be added divided by 2.
The target that the reference wave Uref_new matched for realizing above-mentioned current conversion station energy basis and AC actual voltage is controlled, the invention provides two kinds of methods:
Method one:
Voltage waveform feature during in conjunction with AC fault, the redundancy spare module of respective numbers is configured for inverter, during simultaneous faults, the running voltage of submodule electric capacity remains unchanged, when making AC fault occur, inverter can export the Voltage Reference ripple matched with AC actual voltage, it is achieved the suppression to the exchange unbalance voltage containing residual voltage.
Below for earth-free, high resistance ground or through grounding through arc AC system occur C phase singlephase earth fault method one is illustrated.
Time properly functioning, the alternating voltage reference ripple U of the mutually upper and lower brachium pontis output of voltage source converterrefExcursion be represented by:
M = U r e f _ m a x U d 2
Wherein, UdFor the DC voltage of flexible AC/DC Power System, UacFor ac phase voltage, modulation ratio (M≤1 under normal circumstances, specified modulation ratio is generally taken as 0.85) when M is properly functioning, Uref_maxFor alternating voltage reference ripple UrefPeak value.
When disregarding redundancy submodule, time properly functioning, submodule configuration number is:
N = U d U a v g
Wherein, UavgFor submodule electric capacity running voltage (submodule capacitor averaging working voltage).
When there is C phase singlephase earth fault as shown in Figure 4 in AC system, the alternating voltage U of fault phase C phaseacCReduce to 0, the requirement of the above-mentioned suppression unbalance voltage method of radical, the excursion of its Voltage Reference ripple should be controlled as:
For healthy phases A phase, B phase, its phase voltage all can be increased to normal valueTimes, therefore its Voltage Reference ripple excursion should be controlled as respectively:
From above two formulas, when DC voltage remains unchanged, the output of healthy phases reference wave is likely negative value, owing to only full-bridge submodule just has negative voltage fan-out capability, it is therefore desirable to configure the standby full-bridge submodule of a number of redundancy on the basis of properly functioning submodule quantity and could meet the control requirement of reference wave in AC fault situation.
For above-mentioned single-phase fault situation, the computing formula of the redundancy standby full-bridge submodule quantity of minimum needs configuration is as follows:
Δ N = ( U d 2 + 3 * M * U d 2 U d 2 + U d 2 - 1 ) * N = 3 M - 1 2 N
As M=0.85, Δ N=0.236N；As M=1, Δ N=0.366N.
Can be obtained fom the above equation, in above-mentioned single-phase fault situation, in method one, the standby full-bridge submodule number of redundancy of minimum needs configuration isIndividual, the configuration number of submodule when wherein N is properly functioning when being disregard redundancy submodule, modulation ratio when M is properly functioning.
For method one, meeting properly functioning required sub-module types can be half-bridge, class full-bridge or full-bridge submodule, and needs the redundancy spare module of configuration to be required to be full-bridge submodule.
For other unbalanced fault situations, it is possible to carry out the calculating of the minimum standby full-bridge submodule number of redundancy needing configuration in conjunction with alternating voltage waveform feature during fault.
The configuration of inverter submodule is carried out, it is possible to achieve the suppression to the exchange unbalance voltage containing residual voltage according to above-mentioned result of calculation.
Method two:
Voltage waveform feature during in conjunction with AC fault, do not increase the submodule configuration number of inverter, by controlling to increase the running voltage of submodule electric capacity during fault occurs, when making AC fault occur, inverter can export the reference wave matched with AC actual voltage, realize the suppression to the exchange unbalance voltage containing residual voltage, still for aforementioned exchange C phase single-phase fault, method two is illustrated below.
For aforementioned single-phase fault situation, when DC voltage remains unchanged, the calculating of the minimum value needing to increase of submodule electric capacity running voltage during fault generation:
ΔU a v g = ( U d 2 + 3 * M * U d 2 U d 2 + U d 2 - 1 ) * U a v g = 3 M - 1 2 U a v g
Can be obtained fom the above equation, the value that in method two, during fault generation, the minimum needs of submodule electric capacity running voltage increase in aforementioned single-phase fault situation isWherein UavgFor submodule electric capacity running voltage time properly functioning (submodule capacitor averaging working voltage), modulation ratio when M is properly functioning.
For method two, the submodule configuration number of inverter does not increase, when DC voltage remains unchanged, the output of healthy phases reference wave is likely negative value, owing to only full-bridge submodule just has negative voltage fan-out capability, it is therefore desirable to configure a certain proportion of full-bridge submodule in submodule and could meet the control requirement of reference wave under failure condition.
For aforementioned single-phase fault situation, in submodule, the full-bridge submodule quantity of minimum needs configuration is:
Δ N = 3 M - 1 2 U a v g ( 1 + 3 M - 1 2 ) * U a v g * N = 3 M - 1 3 M + 1 N
Namely at least should by properly functioning required submoduleBeing configured to full-bridge submodule, all the other submodules can be half-bridge, class full-bridge or full-bridge submodule.
For other asymmetrical alternating current failure conditions, it is possible to carry out the calculating of the minimum value needing to increase of submodule electric capacity running voltage in conjunction with alternating voltage waveform feature during fault.
The control of submodule electric capacity running voltage during fault is carried out, it is possible to achieve the suppression to the exchange unbalance voltage containing residual voltage according to above-mentioned result of calculation.
In actual applications, it is also possible to integrated use method as required one and method two, when making AC fault occur, inverter can export the reference wave matched with AC actual voltage, it is achieved the suppression to the exchange unbalance voltage containing residual voltage.
It should be noted that the present invention is applicable to the flexible AC/DC Power System that two or more voltage-source type current conversion stations are constituted, for instance two ends/Multi-end flexible direct current transmission, DC distribution net, THE UPFC (UPFC) etc..
Above example is only the technological thought that the present invention is described, it is impossible to limits protection scope of the present invention, every technological thought proposed according to the present invention, any change done on technical scheme basis with this, each falls within scope.

Claims (12)

1. suppress the method that exchange unbalance voltage is propagated between voltage-source type current conversion station, it is characterized in that, detection voltage-source type current conversion station AC or the DC side unbalance voltage containing residual voltage, when detecting that unbalance voltage occurs, inverter is made to produce corresponding Voltage Reference ripple, described Voltage Reference ripple and AC actual voltage match, and suppress DC voltage fluctuation that unbalance voltage causes and to the propagation of non-faulting station AC system.
2. the method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station as claimed in claim 1, it is characterized in that, the generation method of the Voltage Reference ripple matched with AC actual voltage is, open sea wharf and interior circular current control the Voltage Reference ripple Uref producing to control based on positive-negative sequence, zero sequence voltage detection controls to produce residual voltage reference value Uo_ref, Voltage Reference ripple Uref deducts residual voltage reference value Uo_ref and generates the reference wave Uref_new matched with AC actual voltage, and current conversion station is controlled according to Uref_new.
3. the method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station as claimed in claim 1, it is characterized in that, method also includes, voltage waveform feature during in conjunction with AC fault, for inverter configuring redundancy spare module, during simultaneous faults, the running voltage of submodule electric capacity remains unchanged, and when making AC fault occur, inverter can export the reference wave matched with AC actual voltage, it is achieved the suppression to the exchange unbalance voltage containing residual voltage.
4. the method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station as claimed in claim 1, it is characterized in that, method also includes, voltage waveform feature during in conjunction with AC fault, do not increase the submodule number of inverter, the running voltage of submodule electric capacity during increase fault, when making AC fault occur, inverter can export the reference wave matched with AC actual voltage, it is achieved the suppression to the exchange unbalance voltage containing residual voltage.
5. the method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station as claimed in claim 1, it is characterized in that, method also includes, voltage waveform feature during in conjunction with AC fault, a number of redundancy spare module is configured for inverter, and, the running voltage of submodule electric capacity during increase fault, when making AC fault occur, inverter can export the reference wave matched with AC actual voltage, it is achieved the suppression to the exchange unbalance voltage containing residual voltage.
6. the method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station as claimed in claim 1, it is characterised in that in described inverter, the type of submodule includes half-bridge MMC, class full-bridge MMC or full-bridge MMC type structure.
7. one kind is suppressed the current conversion station submodule configuration method that exchange unbalance voltage is propagated between voltage-source type current conversion station, it is characterized in that, voltage waveform feature during in conjunction with AC fault carries out the calculating that inverter needs the redundancy spare module number of configuration, and carries out the configuration of inverter submodule according to result of calculation.
8. a kind of current conversion station submodule configuration method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station as claimed in claim 7, it is characterized in that, when AC fault occurs, the reference wave that inverter output matches with AC actual voltage, when DC voltage remains unchanged, the standby full-bridge submodule number of redundancy of minimum configuration isIndividual, the configuration number of submodule when wherein N is properly functioning when being disregard redundancy submodule, modulation ratio when M is properly functioning.
9. one kind is suppressed the current conversion station submodule electric capacity running voltage control method that exchange unbalance voltage is propagated between voltage-source type current conversion station, it is characterized in that, during voltage waveform feature calculation fault during in conjunction with AC fault, submodule electric capacity running voltage needs the value increased, and carries out the control of submodule electric capacity running voltage during fault according to result of calculation.
10. a kind of current conversion station submodule electric capacity running voltage control method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station as claimed in claim 9, it is characterized in that, when AC fault occurs, the reference wave that inverter output matches with AC actual voltage, when the submodule number and DC voltage that do not increase inverter remain unchanged, the value that during fault generation, the minimum needs of submodule electric capacity running voltage increase isWherein UavgFor submodule electric capacity running voltage time properly functioning, modulation ratio when M is properly functioning.
11. a kind of current conversion station submodule electric capacity running voltage control method suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station as claimed in claim 9, it is characterized in that, when AC fault occurs, the reference wave that inverter output matches with AC actual voltage, when the submodule number and DC voltage that do not increase inverter remain unchanged, to major generalIndividual submodule is configured to full-bridge submodule, and all the other submodules can be half-bridge, class full-bridge or full-bridge submodule, the configuration number of submodule when wherein N is properly functioning when being disregard redundancy submodule, modulation ratio when M is properly functioning.
12. the current conversion station submodule configuration suppressing exchange unbalance voltage to propagate between voltage-source type current conversion station and electric capacity running voltage control method, it is characterized in that, voltage waveform feature during in conjunction with AC fault carries out submodule electric capacity running voltage during inverter needs the redundancy spare module number of configuration and fault needs the COMPREHENSIVE CALCULATING of value increased, and carries out the control of submodule electric capacity running voltage during the configuration of inverter submodule and fault according to result of calculation.
CN201610248881.8A 2016-04-20 2016-04-20 Method for suppressing propagation of AC unbalanced voltage between voltage source type converter stations Pending CN105762827A (en)

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Application publication date: 20160713