CN103580521A - Multi-level voltage source current converter and control method thereof - Google Patents
Multi-level voltage source current converter and control method thereof Download PDFInfo
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- CN103580521A CN103580521A CN201310576311.8A CN201310576311A CN103580521A CN 103580521 A CN103580521 A CN 103580521A CN 201310576311 A CN201310576311 A CN 201310576311A CN 103580521 A CN103580521 A CN 103580521A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/7575—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
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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
- 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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Abstract
The invention discloses a multi-level voltage source current converter comprises at least one phase unit. Each phase unit comprises an upper bridge arm, a lower bridge arm and a current conversion electric reactor, wherein the upper bridge arm and the lower bridge arm respectively comprise at least two sub-modules, a switch loop and a bridge arm electric reactor all of which are sequentially connected in series; all sub-modules in the same bridge arm are connected in series in the same direction; the sub-modules, connected with the switch loop, in the upper bridge arm are opposite to the sub-modules, connected with the switch loop, in the lower bridge arm in polarity; one end, connected with the electric reactor in series, of the upper bridge arm and one end, connected with the electric reactor in series, of the lower bridge arm are connected and have access to an alternating current network through the current conversion electric reactor; the other end of the upper bridge arm and the other end of the lower bridge arm serve as a first direct current endpoint and a second direct current endpoint of the phase unit respectively to have access to a direct current network. Each switch loop comprises a plurality of anti-parallel thyristor pairs which are connected in series. The multi-level voltage source current converter is applied to flexible direct-current transmission and the like, and has the advantages of being small in number of the sub-modules, low in cost, small in consumption, capable of effectively blocking fault currents when the direct current side breaks down, and the like. The invention further discloses a control method of the multi-level voltage source current converter.
Description
Technical field
The invention belongs to flexible DC power transmission field, particularly a kind of voltage with multiple levels source converter and control method thereof.
Background technology
Flexible DC power transmission adopts voltage source converter, can independent regulation gain merit and idle transmission, improve the ability to transmit electricity of AC system, be easy to form multi-terminal HVDC transmission system, in the application such as electricity generation grid-connecting, isolated island urban electricity supply and the AC system of regenerative resource be interconnected, there is obvious competitiveness.
Flexible DC power transmission system is used more topological structure to have at present: two level, three level topological structures and modular many level structure.Each brachium pontis of the voltage source converter of two level structures is directly in series by a plurality of full-control type IGBT switches, by two level of voltage of PWM modulator approach output plus or minus bus, the duty ratio of level is directly proportional to sinusoidal wave amplitude, its switching frequency is higher, harmonic content is large, the voltage stress of switching device is larger, and the voltage-sharing of switching tube is difficult to process; Three-level converter switching frequency decreases, but does not solve foregoing problems at all; The brachium pontis of modularization multi-level converter (MMC) adopts a plurality of semi-bridge type submodules in series, each submodule is equivalent to a controllable voltage source, output 0 or two level of capacitance voltage, the voltage stack of a plurality of submodules output can obtain the sine voltage of required output, with respect to the switching frequency of two each switching device of level structure significantly reduce, harmonic content is low.
The voltage source converter of above-mentioned three kinds of topological structures; when DC side fault; AC can be by the very large fault current of the diode feed-in in parallel with switching device; this electric current is uncontrollable; can only be by the circuit breaker excision of the AC of (40～60ms) slowly of tripping responsiveness; the fail safe of serious threat converter, and therefore need to increase extra protective circuit.For the direct current network of multiterminal, adopt these topological DC transmission system, AC switch that must all converters of tripping when DC side fault could be removed fault, and operation of power networks is had a strong impact on.
Voltage source converter at present the main IGBT that adopts as switching device, IGBT loss is larger, withstand voltage low, cost is high, has restricted to a certain extent the application and development of voltage-source type direct current transportation.
Summary of the invention
Object of the present invention, be to provide a kind of voltage with multiple levels source converter and control method thereof, it is applicable to application such as flexible DC power transmissions, has that submodule number is few, cost is low, loss is little, and the advantages such as fault current can effectively block DC side fault time.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of voltage with multiple levels source converter, comprise at least one facies unit, each facies unit includes brachium pontis, lower brachium pontis and converter reactor, described upper and lower brachium pontis includes at least two submodules, a switch loop and a brachium pontis reactor of order series connection, all submodule series aiding connections in same brachium pontis, and contrary with the polarity of the loop-coupled submodule of switch in upper and lower brachium pontis; In described upper and lower brachium pontis, string has one end of brachium pontis reactor to be connected, and via converter reactor incoming transport network, and the other end of upper and lower brachium pontis accesses DC network as first and second direct current end points of this facies unit respectively; Described switch loop comprises the reverse parallel connection thyristor pair of several mutual series connection.
Above-mentioned submodule comprises two gate-controlled switch devices, two diodes and an energy-storage travelling wave tube, two diodes are distinguished corresponding reverse parallel connections with two gate-controlled switch devices, the negative pole of the first gate-controlled switch device is connected with the positive pole of the second gate-controlled switch device, and this tie point is as the first end points of submodule, the positive pole of described the first gate-controlled switch device connects the negative pole of the second gate-controlled switch device via energy-storage travelling wave tube, and this tie point is as the second end points of submodule.
For a control method for foregoing voltage with multiple levels source converter, each submodule of controlling in converter is operated in three state:
1: the first gate-controlled switch device of state is open-minded, and the second gate-controlled switch device turn-offs, the voltage that the output voltage of this submodule is energy-storage travelling wave tube, and submodule is in input state;
2: the first gate-controlled switch devices of state turn-off, and the second gate-controlled switch device is open-minded, and the output voltage of this submodule is 0, and submodule is in exit status;
State 3: first, second gate-controlled switch device all turn-offs, and the output voltage of this submodule is determined by the sense of current; The output voltage of described submodule is the relative double-pointed voltage of this submodule the first end points.
By controlling the submodule number in state 1 and state 2, realize the voltage of controlling brachium pontis output; The submodule quantity of control in state 1 equals this brachium pontis output voltage divided by the average voltage of submodule energy-storage travelling wave tube.
Above-mentioned switch loop is according to the conducting in turn of converter AC output voltage, for the output of a certain phase, and when output AC side voltage is timing, the conducting that is triggered of the switch loop of described upper brachium pontis, the switch loop of lower brachium pontis is in cut-off state; When output AC side voltage is when negative, the conducting that is triggered of the switch loop of lower brachium pontis, upper brachium pontis switch loop is in cut-off state.
When short trouble appears in DC side, by the reverse triggering signal of thyristor in latch switch loop, make after reverse current zero passage oppositely thyristor recover cut-off state, thereby cut off DC side fault current.
Adopt after such scheme, the present invention is applicable to two ends and multiterminal flexible DC power transmission system, has following characteristics:
(1) based on this topological converter, by submodule output voltage, superpose, the AC wave shape of converter output can be approached sine wave well, and harmonic content is low;
(2) submodule of converter half-bridge structure of the present invention part is only born half of voltage between positive and negative DC bus, all the other voltages are born the thyristor in switch loop, make in same electric pressure situation, submodule number based on converter of the present invention nearly can reduce half with respect to the converter of existing MMC structure, the substitute is switch loop simple and compact for structure, the cost of converter and volume can reduce respectively 30%;
(3) the present invention adopts " thyristor of reverse parallel connection to " to replace a part of submodule in MMC converter, due to the voltage endurance capability of the thyristor device IGBT device far above full control, therefore the thyristor number in switch loop can greatly reduce, the conduction voltage drop of thyristor, also lower than the IGBT of full control, therefore adopts the conduction loss of converter of the present invention can reduce approximately 30% simultaneously;
(4) the present invention, when Converter DC-side is short-circuited fault, can pass through the transistor blocking fault current in control switch loop.The DC side fault current duration is no more than power frequency period half, is in the safe range of switching device, can not need the protection thyristor of reverse parallel connection in half-bridge submodule of the present invention.The DC side fault current automatically characteristic of blocking-up also helps the requirement reducing the cut-out electric current index of DC circuit breaker.The present invention has met the requirement that multiterminal direct currents, built on stilts DC line are moved, avoid the shortcoming of existing converter AC circuit breaker ability disengagement failure electric current of the every one end of necessary tripping when DC side fault, avoided the threat to converter safety slowly of AC circuit breaker responsiveness.
Accompanying drawing explanation
Fig. 1 is the topological structure schematic diagram of a facies unit in converter of the present invention;
Fig. 2 is the structural representation of submodule in converter of the present invention;
Fig. 3 is the equivalent working state schematic representation of submodule in converter of the present invention;
Wherein, (a) and (b), (c) represent respectively 3 kinds of operating states;
Fig. 4 is converter output voltage control method embodiment of the present invention;
When Fig. 5 is DC side fault, the present invention suppresses the schematic diagram of fault current.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention and beneficial effect are elaborated.
As shown in Figure 1, the invention provides a kind of voltage with multiple levels source converter, comprise at least one facies unit, each facies unit includes brachium pontis, lower brachium pontis and converter reactor, described upper and lower brachium pontis includes at least two submodules, a switch loop and a brachium pontis reactor of order series connection, all submodule series aiding connections in same brachium pontis, and contrary with the polarity of the loop-coupled submodule of switch in upper and lower brachium pontis; In described upper and lower brachium pontis, string has one end of brachium pontis reactor to be connected, and via converter reactor incoming transport network, and the other end of upper and lower brachium pontis accesses DC network as first and second direct current end points of this facies unit respectively.
As shown in Figure 2, it is the circuit connection diagram of submodule in the present invention, described submodule comprises two gate-controlled switch devices, two diodes and an energy-storage travelling wave tube, two diodes are distinguished corresponding reverse parallel connections with two gate-controlled switch devices, and the negative pole of the first gate-controlled switch device T1 is connected with the positive pole of the second gate-controlled switch device T2, and this tie point is as the first end points IN1 of submodule, the positive pole of described the first gate-controlled switch device T1 connects the negative pole of the second gate-controlled switch device T2 via energy-storage travelling wave tube, and this tie point is as the second end points IN2 of submodule.The polarity of first and second end points is contrary, it should be noted that, when concrete place in circuit forms facies unit, both can in upper brachium pontis, the first end points of submodule be connected with switch loop, also the second end points can be connected with switch loop, in lower brachium pontis, be that another kind of end points is connected with switch loop, as long as make in upper and lower brachium pontis different from the end points of the loop-coupled submodule of switch.
Described switch loop comprises the reverse parallel connection thyristor pair of several mutual series connection, can coordinate shown in Fig. 1.
The present invention also provides a kind of control method for above-mentioned voltage with multiple levels source converter, and positive and negative corresponding to output AC side voltage controlled the thyristor conducting in turn in upper and lower brachium pontis switch loop; By controlling the operating state of each submodule in converter, realize converter output voltage with multiple levels waveform.
As shown in Figure 3, in above-mentioned converter, the control mode of each submodule is: control this submodule and be operated in three state: state 1(can coordinate (a) in Fig. 3): the first gate-controlled switch device is open-minded, the second gate-controlled switch device turn-offs, the voltage that the output voltage of this submodule is energy-storage travelling wave tube; State 2(can coordinate (b) in Fig. 3): the first gate-controlled switch device turn-offs, and the second gate-controlled switch device is open-minded, and the output voltage of this submodule is 0; State 3(can coordinate (c) in Fig. 3): first, second gate-controlled switch device all turn-offs, and the output voltage of this submodule is determined by the sense of current; The output voltage of described submodule is the relative double-pointed voltage of this submodule the first end points.
Converter in the present invention is controlled the voltage of output by the conducting in turn of brachium pontis and the number of brachium pontis input submodule.When output voltage is timing, upper brachium pontis conducting, upper brachium pontis is in dropping into submodule number=output voltage/submodule capacitor averaging voltage of state, and the switch loop that upper brachium pontis is comprised of a plurality of " thyristors of reverse parallel connection to " is in conducting state, and lower brachium pontis switch loop is in cut-off state; When output voltage is when negative, lower brachium pontis conducting, lower brachium pontis is in dropping into submodule number=-output voltage/submodule capacitor averaging voltage of state, and lower brachium pontis switch loop is in conducting state, and upper brachium pontis switch loop is in cut-off state.
As shown in Figure 4: with " be input as ± 5kV of direct current, ac output end target voltage+3kV ", be example, the output voltage control method based on converter of the present invention is described.The capacitance voltage of supposing each subelement is 1kV, and in control, brachium pontis submodule SM1, SM2 are in input state, and output voltage is 2kV altogether, SM3, SM4, SM5 are in exit status, output voltage is 0kV, and upper brachium pontis switch loop is conducting state, and both end voltage is 0kV.Simultaneously, SM1～the SM5 of lower brachium pontis is in input state, output voltage is 5kV altogether, and the switch loop of lower brachium pontis is in cut-off state, and the voltage that descends brachium pontis switch loop to bear is 10kV-voltage (upper brachium pontis SM1～SM2)-voltage (lower brachium pontis SM1～SM5)=10kV-2kV-5kV=3kV.By above-mentioned control method, can make voltage=direct current positive bus voltage-voltage (upper brachium pontis SM1～SM2)=3kV of ac output end.By above-mentioned similar method, control the state in submodule and switch loop, can control the voltage of converter output, thereby simulate the voltage signal of sinusoidal wave each point.
Further, when short trouble appears in DC side, by the reverse triggering signal of thyristor in latch switch loop, make after reverse current zero passage oppositely thyristor recover cut-off state, thereby cut off DC side fault current.As shown in Figure 5, when the interchange end of converter exists an alternating-current voltage source, and during DC side generation DC bus earth fault, if the thyristor in switch loop is in conducting state, at this moment will produce fault current as shown in Figure 5, fault current path is represented by curve.Fault current, by along with exchanging the positive and negative variation of terminal voltage, alternately flows to the earth terminal of DC side from the interchange end of upper and lower bridge arm, thereby produces very large fault current through the diode submodule.Detect in time DC side fault, and the triggering signal in switch loop is set to low level, when fault current replaces through upper and lower bridge arm, fault current in brachium pontis will inevitably zero passage, thyristor in switch loop will recover cut-off state naturally, thereby realized the DC side fault current block function of converter, and at most lasting half cycle of fault current just can be blocked.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection range of the present invention.
Claims (6)
1. a voltage with multiple levels source converter, it is characterized in that: comprise at least one facies unit, each facies unit includes brachium pontis, lower brachium pontis and converter reactor, described upper and lower brachium pontis includes at least two submodules, a switch loop and a brachium pontis reactor of order series connection, all submodule series aiding connections in same brachium pontis, and contrary with the polarity of the loop-coupled submodule of switch in upper and lower brachium pontis; In described upper and lower brachium pontis, string has one end of brachium pontis reactor to be connected, and via converter reactor incoming transport network, and the other end of upper and lower brachium pontis accesses DC network as first and second direct current end points of this facies unit respectively; Described switch loop comprises the reverse parallel connection thyristor pair of several mutual series connection.
2. a kind of voltage with multiple levels as claimed in claim 1 source converter, it is characterized in that: described submodule comprises two gate-controlled switch devices, two diodes and an energy-storage travelling wave tube, two diodes are distinguished corresponding reverse parallel connections with two gate-controlled switch devices, the negative pole of the first gate-controlled switch device is connected with the positive pole of the second gate-controlled switch device, and this tie point is as the first end points of submodule, the positive pole of described the first gate-controlled switch device connects the negative pole of the second gate-controlled switch device via energy-storage travelling wave tube, and this tie point is as the second end points of submodule.
3. for a control method for voltage with multiple levels as claimed in claim 2 source converter, it is characterized in that: each submodule of controlling in converter is operated in three state:
1: the first gate-controlled switch device of state is open-minded, and the second gate-controlled switch device turn-offs, the voltage that the output voltage of this submodule is energy-storage travelling wave tube, and submodule is in input state;
2: the first gate-controlled switch devices of state turn-off, and the second gate-controlled switch device is open-minded, and the output voltage of this submodule is 0, and submodule is in exit status;
State 3: first, second gate-controlled switch device all turn-offs, and the output voltage of this submodule is determined by the sense of current; The output voltage of described submodule is the relative double-pointed voltage of this submodule the first end points.
4. the control method of a kind of voltage with multiple levels as claimed in claim 3 source converter, is characterized in that: by controlling the submodule number in state 1 and state 2, realize the voltage of controlling brachium pontis output; The submodule quantity of control in state 1 equals this brachium pontis output voltage divided by the average voltage of submodule energy-storage travelling wave tube.
5. the control method of a kind of voltage with multiple levels as claimed in claim 3 source converter, it is characterized in that, described switch loop is according to the conducting in turn of converter AC output voltage, for the output of a certain phase, when output AC side voltage is timing, the conducting that is triggered of the switch loop of described upper brachium pontis, the switch loop of lower brachium pontis is in cut-off state; When output AC side voltage is when negative, the conducting that is triggered of the switch loop of lower brachium pontis, upper brachium pontis switch loop is in cut-off state.
6. the control method of a kind of voltage with multiple levels as claimed in claim 5 source converter, it is characterized in that, when there is short trouble in DC side, by the triggering signal of reverse thyristor in latch switch loop, after making reverse current zero passage, reverse thyristor recovers cut-off state, thereby cuts off DC side fault current.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103904658A (en) * | 2014-03-31 | 2014-07-02 | 南方电网科学研究院有限责任公司 | Modularized multi-level converter with bridge arm redundancy function and control method thereof |
| CN104009446A (en) * | 2014-02-27 | 2014-08-27 | 南京南瑞继保电气有限公司 | Direct-current transmission protection device, current converter and protection method |
| CN104319075A (en) * | 2014-09-19 | 2015-01-28 | 南方电网科学研究院有限责任公司 | Connecting reactor for multi-level voltage source transverter |
| CN104868748A (en) * | 2014-02-20 | 2015-08-26 | 南京南瑞继保电气有限公司 | Current converter module unit, current converter, DC power transmission system and control method |
| EP2999105A1 (en) * | 2014-09-17 | 2016-03-23 | Alstom Technology Ltd | Hybrid modular multicell converter with bidirectional thyristor switches |
| CN105490295A (en) * | 2015-12-16 | 2016-04-13 | 南京南瑞继保电气有限公司 | Capacitive voltage control method for bridge current-conversion modular multi-level converter |
| CN105656343A (en) * | 2016-01-27 | 2016-06-08 | 邓富金 | Thyristor-based modular multi-level converter and operation method thereof |
| CN107666251A (en) * | 2016-07-28 | 2018-02-06 | 全球能源互联网研究院有限公司 | A kind of modular multilevel hands over AC-AC converter |
| CN108258657A (en) * | 2018-03-05 | 2018-07-06 | 南京南瑞继保电气有限公司 | A kind of voltage source converter protection circuit and guard method and device |
| CN109586601A (en) * | 2018-12-03 | 2019-04-05 | 清华大学 | A kind of mixed bridge circuit and its control method |
| CN110995038A (en) * | 2019-11-21 | 2020-04-10 | 中国电力科学研究院有限公司 | MMC (modular multilevel converter) and DC fault isolation method and system based on MMC |
| CN113595057A (en) * | 2021-07-29 | 2021-11-02 | 国家电网有限公司 | Direct-current side controllable energy storage device for flexible direct-current system and control method |
| CN113922407A (en) * | 2021-09-09 | 2022-01-11 | 南京南瑞继保电气有限公司 | Low-pressure pressurizing system of flexible direct current converting station and control method |
| CN114113996A (en) * | 2021-11-08 | 2022-03-01 | 国网浙江省电力有限公司舟山供电公司 | Flexible direct-current power transmission converter valve submodule field test method and system |
| EP3206288B1 (en) * | 2014-10-08 | 2023-03-08 | Mitsubishi Electric Corporation | Power conversion device |
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