WO2017129026A1 - 一种混合背靠背直流输电系统及潮流反转控制方法 - Google Patents

一种混合背靠背直流输电系统及潮流反转控制方法 Download PDF

Info

Publication number
WO2017129026A1
WO2017129026A1 PCT/CN2017/071655 CN2017071655W WO2017129026A1 WO 2017129026 A1 WO2017129026 A1 WO 2017129026A1 CN 2017071655 W CN2017071655 W CN 2017071655W WO 2017129026 A1 WO2017129026 A1 WO 2017129026A1
Authority
WO
WIPO (PCT)
Prior art keywords
knife gate
conversion
vsc
converter
lcc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/071655
Other languages
English (en)
French (fr)
Inventor
汪楠楠
赵文强
王永平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NR Electric Co Ltd
NR Engineering Co Ltd
Original Assignee
NR Electric Co Ltd
NR Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NR Electric Co Ltd, NR Engineering Co Ltd filed Critical NR Electric Co Ltd
Priority to US15/735,204 priority Critical patent/US10181799B2/en
Priority to KR1020177035965A priority patent/KR101918693B1/ko
Priority to MX2017016240A priority patent/MX378090B/es
Priority to RU2017143837A priority patent/RU2679824C1/ru
Priority to EP17743641.7A priority patent/EP3293846A4/en
Priority to BR112018001501A priority patent/BR112018001501A2/pt
Priority to CA2989539A priority patent/CA2989539C/en
Publication of WO2017129026A1 publication Critical patent/WO2017129026A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
    • H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
    • H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
    • H02M5/443—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/45—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M5/4505—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only having a rectifier with controlled elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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
    • H02J3/04—Arrangements for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling the transfer of power between connected networks; Controlling load sharing between connected networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; 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 high-voltage DC [HVDC] links; Arrangements for transfer of electric power between generators and networks via HVDC links
    • 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
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
    • H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
    • H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
    • H02M5/453—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • 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]

Definitions

  • the invention belongs to the field of power electronics, and in particular relates to a hybrid direct current transmission system and a power flow reversal control method.
  • HVDC transmission technology can be divided into two categories: thyristor-based current source type direct current transmission technology (LCC-HVDC), and flexible direct current transmission technology based on fully-controlled power electronic devices (VSC-HVDC).
  • LCC-HVDC has low cost, low loss and mature operation technology.
  • the current source type direct current transmission system LCC-HVDC
  • Phase failure strong dependence on the AC system, absorption of a large number of reactive power, large area of the converter station and other shortcomings.
  • the new generation VSC-HVDC can realize active power and reactive power decoupling control, no need for reactive power compensation, compact structure, small footprint, no commutation failure, etc., but there are also high cost and large loss. And other defects. Therefore, combining LCC-HVDC and VSC-HVDC technology, one end adopts LCC converter and one end adopts VSC converter to form hybrid DC transmission technology, which can mature LCC-HVDC technology, low cost, low loss and VSC-HVDC technology. The adjustment performance is good, the footprint is small, and there is no advantage of commutation failure failure, which will have broad engineering application prospects.
  • the object of the present invention is to provide a hybrid back-to-back DC transmission system and a rapid power flow reversal control method thereof.
  • the system realizes that the VSC converter is always reversed under the condition of forward or reverse power flow by configuring a transfer switch or a knife switch.
  • the variable operation avoids the problem of commutation failure that may occur in the LCC inverter inverter operation, and also provides a control method for realizing rapid power flow reversal by switching the knife gate.
  • a hybrid back-to-back DC transmission system comprising a back-to-back connection LCC inverter and a VSC inverter, further comprising first to fourth switching cutters and first and second AC system busbars, the first AC system busbars respectively Connected to one end of the first conversion knife gate and the second conversion knife gate, the other end of the first conversion knife gate is respectively connected with one end of the LCC converter and the fourth conversion knife gate, and the other end of the second conversion knife gate Connected to one end of the VSC inverter and the third conversion knife gate respectively, and the second AC system bus line is respectively connected to the other end of the third conversion knife gate and the other end of the fourth conversion knife gate;
  • the first to fourth switching cutters are both an isolating knife or a circuit breaker, or a combination of an isolating knife and a circuit breaker.
  • the presence of at least one grounding point on the valve side of the VSC converter means that the VSC converter is coupled to the variable valve side AC field using a star reactance plus a neutral point via a resistor ground, or a VSC inverter The neutral point of the coupling variable valve side winding is grounded via a resistor.
  • the present invention also provides a power flow reversal control method based on the hybrid back-to-back DC power transmission system, the power flow reversal control method comprising the following steps:
  • step (2) If the power flow reversal command is accepted, proceed to step (2), otherwise continue to step (1);
  • step (3) issuing a shutdown command to lock the LCC and VSC converters of the hybrid back-to-back DC transmission system, and proceeding to step (3);
  • step (4) If the power is converted from forward to reverse, enter step (4), if the power is converted from reverse to positive, enter step (5);
  • the specific delay time of the set reverse rotation delay is determined according to system analysis.
  • FIG. 1 is a schematic diagram of a hybrid back-to-back DC transmission system provided by the present invention
  • FIG. 2 is a schematic diagram of a hybrid back-to-back DC transmission topology of a DC-side grounding provided by the present invention
  • FIG. 3 is a schematic diagram of a hybrid back-to-back DC transmission topology in which a VSC inverter is grounded through an impedance ground provided by the present invention
  • FIG. 4 is a schematic diagram of a hybrid back-to-back DC transmission topology in which a VSC converter is grounded by a commutating neutral point by providing a grounding point of the LCC converter provided by the present invention
  • FIG. 5 is a schematic diagram of a hybrid back-to-back DC transmission topology in which a mid-point grounding of a LCC converter and a VSC converter are not grounded according to the present invention
  • FIG. 6 is a schematic diagram of a hybrid back-to-back DC transmission topology in which an LCC converter is not grounded and a VSC converter is grounded through an impedance;
  • FIG. 7 is a schematic diagram of a hybrid back-to-back DC transmission topology in which the LCC converter of the present invention is not grounded and the VSC converter is grounded by commutation to a neutral point;
  • FIG. 8 is a flow chart of a power flow reversal method of a hybrid back-to-back DC power transmission system provided by the present invention.
  • LCC LCC converter
  • VSC VSC converter
  • Q1 to Q4 are first to fourth conversion knife gates respectively
  • B1 and B2 are busbars of first and second AC systems respectively.
  • the hybrid back-to-back DC power transmission system comprises a back-to-back power transmission topology formed by a back-to-back LCC and a VSC converter connected by a smoothing reactor L.
  • the busbar B1 of the system is connected, and the other end is connected to the AC side of the VSC converter;
  • the third switching knife gate Q3 is connected to the busbar B2 of the second AC system, and the other end is connected to the AC side of the VSC converter;
  • One end of the knife gate Q4 is connected to the bus bar B2 of the second AC system, and the other end is connected to the AC side of the LCC inverter.
  • the active power flows from the first AC system to the second AC system for power forward, and vice versa for power reverse transmission; when the power is being sent, the first conversion knife gate Q1 and the third conversion knife gate Q3 Closed, the second conversion knife gate Q2 and the fourth conversion knife gate Q4 are separated; when the power is reversed, the first conversion knife gate Q1 and the third conversion knife gate Q3 are separated, the second conversion knife gate Q2, and the fourth conversion knife gate Q4 closure.
  • the VSC converter always acts as the receiving end for the inverter operation, which avoids the problem that the commutation failure is easy to occur under the LCC inverter inverter operation mode.
  • the first switching knife gate Q1, the second switching knife gate Q2, the third switching knife gate Q3, and the fourth switching knife gate Q4 are isolation knife gates or circuit breakers, or isolation blades. Combination of brakes and circuit breakers.
  • the connection relationship may be directly connected through a wire, or may be indirectly connected through other switches or knife gates, and is equivalent to direct connection of wires when the other switches or knife gates are closed.
  • back-to-back transmission topology back-to-back transmission topology comprising an LCC converter and a VSC converter connected by a back-to-back connection of the smoothing reactor L may be in the form of FIG. 2-7.
  • FIG. 2 is a schematic diagram of a hybrid back-to-back DC transmission topology provided by the present invention
  • the LCC converter adopts a twelve-pulse bridge circuit; wherein each bridge arm is composed of a plurality of thyristors connected in series; LCC commutation
  • the three-winding transformers with Y0/Y/ ⁇ , respectively, are connected to the AC grid of the transmitting end.
  • the transformer can change the voltage level of the three-phase AC of the AC system to meet the required DC voltage level.
  • the difference of the secondary side of the transformer is the upper and lower six-pulse commutation of the twelve-pulse bridge type thyristor converter.
  • the bridge provides three-phase AC with a phase angle difference of 30° to reduce harmonic currents flowing into the grid.
  • the VSC inverter is connected to the receiving AC grid via a two-winding transformer with a Y0/ ⁇ connection.
  • the LCC inverter and the VSC inverter are connected back to back by the smoothing reactor L, and the DC side positive or negative line is connected to the grounding point.
  • FIG. 3 is a schematic diagram of a hybrid back-to-back DC transmission topology in which a VSC inverter is grounded through an impedance grounded by an LCC converter provided by the present invention; a LCC converter uses a twelve-pulse bridge circuit; wherein each bridge The arm is composed of a plurality of thyristors connected in series; the middle of the upper and lower six-pulse commutated bridges of the twelve-pulse bridge converter is connected to the grounding point, and the LCC converter is respectively connected by a wiring mode of Y0/Y/ ⁇
  • the winding transformer is connected to the AC grid of the transmitting end. The transformer can change the voltage level of the three-phase AC of the AC system to meet the required DC voltage level.
  • the difference of the secondary side of the transformer is the upper and lower six-pulse commutation of the twelve-pulse bridge type thyristor converter.
  • the bridge provides three-phase AC with a phase angle difference of 30° to reduce harmonic currents flowing into the grid.
  • the VSC inverter is connected to the receiving AC grid via a two-winding transformer with a Y0/ ⁇ connection.
  • the valve side of the VSC converter is grounded by a star reactance + neutral grounding resistor.
  • the LCC inverter and the VSC inverter are connected back to back by the smoothing reactor L.
  • each bridge arm is composed of a plurality of thyristors connected in series; the middle of the upper and lower six-pulse commutated bridges of the twelve-pulse bridge converter is connected to the grounding point, and the LCC converter is respectively connected by Y0/
  • the Y/ ⁇ three-winding transformer is connected to the transmitting end AC grid. The transformer can change the voltage level of the three-phase AC of the AC system to meet the required DC voltage level.
  • the difference of the secondary side of the transformer is the upper and lower six-pulse commutation of the twelve-pulse bridge type thyristor converter.
  • the bridge provides three-phase AC with a phase angle difference of 30° to reduce harmonic currents flowing into the grid.
  • the VSC inverter is connected to the AC grid of the receiving end through a two-winding transformer with wiring mode of ⁇ /Y0.
  • the neutral point of the valve side of the transformer is either resistance grounding or direct grounding.
  • the LCC inverter and the VSC inverter are connected back to back by the smoothing reactor L.
  • FIG. 5 is a schematic diagram of a hybrid back-to-back DC transmission topology in which a mid-point grounding of a LCC converter and a VSC converter are not grounded according to the present invention
  • the LCC converter adopts a twelve-pulse bridge circuit; wherein each bridge arm Each is composed of a plurality of thyristors connected in series; the middle of the upper and lower six-pulse commutated bridges of the twelve-pulse bridge converter is connected to the grounding point, and the LCC converter passes through a three-winding of Y0/Y/ ⁇ respectively.
  • the transformer is connected to the AC grid of the transmitting end. The transformer can change the voltage level of the three-phase AC of the AC system to meet the required DC voltage level.
  • the difference of the secondary side of the transformer is the upper and lower six-pulse commutation of the twelve-pulse bridge type thyristor converter.
  • the bridge provides three-phase AC with a phase angle difference of 30° to reduce harmonic currents flowing into the grid.
  • the VSC inverter is connected to the receiving AC grid through a two-winding transformer with ⁇ /Y0 wiring.
  • the VSC inverter side is not grounded, and the LCC converter and VSC inverter are connected back to back through the smoothing reactor L.
  • FIG. 6 is a schematic diagram of a hybrid back-to-back DC transmission topology in which an LCC converter is not grounded, and a VSC converter is grounded through an impedance; the LCC converter uses a twelve-pulse bridge circuit; wherein each bridge arm Each is composed of a plurality of thyristors connected in series; the LCC converter is connected to the AC grid of the transmitting end through a three-winding transformer with a wiring mode of Y0/Y/ ⁇ .
  • the transformer can change the voltage level of the three-phase AC of the AC system to meet the required DC voltage level.
  • the difference of the secondary side of the transformer is the upper and lower six-pulse commutation of the twelve-pulse bridge type thyristor converter.
  • the bridge provides three-phase alternating current with a phase angle difference of 30° to reduce the harmonic current flowing into the grid, and the LCC converter side is not grounded.
  • the VSC inverter is connected to the receiving AC grid via a two-winding transformer with a Y0/ ⁇ connection.
  • the valve side of the VSC converter is grounded by a star reactance + neutral grounding resistor.
  • the LCC inverter and the VSC inverter are connected back to back by the smoothing reactor L.
  • FIG. 7 is a schematic diagram of a hybrid back-to-back DC transmission topology in which the LCC converter of the present invention is not grounded, and the VSC converter is grounded by commutation to a neutral point; the LCC converter adopts a twelve-pulse bridge circuit; Each bridge arm is composed of a plurality of thyristors connected in series; the LCC inverter is connected to the AC grid of the transmitting end through a three-winding transformer with a wiring mode of Y0/Y/ ⁇ . The transformer can change the voltage level of the three-phase AC of the AC system to meet the required DC voltage level. The difference of the secondary side of the transformer is the upper and lower six-pulse commutation of the twelve-pulse bridge type thyristor converter.
  • the bridge provides three-phase alternating current with a phase angle difference of 30° to reduce the harmonic current flowing into the grid, and the LCC converter side is not grounded.
  • the VSC inverter is connected to the receiving AC grid through a two-winding transformer with a Y0/ ⁇ wiring connection.
  • the neutral point of the transformer valve side is either resistance grounding or direct grounding.
  • the LCC inverter and the VSC inverter are connected back to back by the smoothing reactor L.
  • the power flow reversal method of the hybrid back-to-back DC power transmission system includes:
  • Step 101 If the power flow reversal command is received, proceed to step 102, otherwise continue in step 101;
  • Step 102 Issue a shutdown command to block the LCC and VSC converters of the hybrid back-to-back DC transmission system
  • Step 103 Power is forwarded to forwarded, and steps 104a, 104b, and 104c are sequentially performed. If power is converted from forward to forward, steps 105a, 105b, and 105c are sequentially performed;
  • Step 104a Disconnect all the conversion knife gates, that is, separate the first conversion knife gate Q1, the second conversion knife gate Q2, the third conversion knife gate Q3 and the fourth conversion knife gate Q4;
  • Step 104b Waiting for the set reverse delay
  • Step 104c closing the second switching knife gate Q2, the fourth switching knife gate Q4, proceeds to step 106;
  • Step 105a Disconnect all the conversion knife gates, that is, separate the first conversion knife gate Q1, the second conversion knife gate Q2, the third conversion knife gate Q3 and the fourth conversion knife gate Q4;
  • Step 105b Waiting for the set reverse delay
  • Step 105c closing the first switching knife gate Q1, the third switching knife gate Q3, proceeds to step 106;
  • Step 106 Re-run the hybrid back-to-back DC transmission system.
  • the specific delay time of the inversion delay needs to be determined according to the system analysis, for example, the discharge time of the converter damping circuit needs to be considered, and the discharge time of the capacitor before the AC filter is again input, etc., which is superior.
  • the value ranges from 1s to 60min.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Stand-By Power Supply Arrangements (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

一种混合背靠背直流输电系统及其快速潮流反转控制方法，该系统包括背靠背连接的LCC换流器(LCC)和VSC换流器(VSC)、第一转换刀闸(Q1)、第二转换刀闸(Q2)、第三转换刀闸(Q3)、第四转换刀闸(Q4)，第一转换刀闸(Q1)连接第一交流系统和LCC换流器(LCC)，第二转换刀闸(Q2)连接第一交流系统和VSC换流器(VSC)，第三转换刀闸(Q3)连接第二交流系统和VSC换流器(VSC)，第四转换刀闸(Q4)连接第二交流系统和LCC换流器(LCC)。功率正送时，闭合第一转换刀闸（Q1）、第三转换刀闸（Q3），功率反送时，闭合第二转换刀闸(Q2)、第四转换刀闸(Q4)，保证在任何功率方向下VSC换流器始终为逆变运行，避免了LCC换流器逆变运行时容易出现的换相失败问题。

Description

一种混合背靠背直流输电系统及潮流反转控制方法 技术领域
本发明属于电力电子领域，特别涉及一种混合直流输电系统及潮流反转控制方法。
背景技术
高压直流输电技术可分为两类：基于晶闸管的电流源型直流输电技术(LCC-HVDC)、基于全控型电力电子器件的柔性直流输电技术(VSC-HVDC)。LCC-HVDC成本低，损耗小，运行技术成熟，目前，世界上正在运行的直流输电系统大部分都是LCC-HVDC系统，但电流源型直流输电系统(LCC-HVDC)存在逆变侧易换相失败，对交流系统的依赖性强，吸收大量无功，换流站占地面积大等缺点。而新一代VSC-HVDC能够实现有功功率与无功功率解耦控制、无需无功功率补偿结构紧凑占地面积小、不存在换相失败故障等优点，但目前也存在成本较高，损耗偏大等缺陷。因此将LCC-HVDC和VSC-HVDC技术相结合，一端采用LCC换流器、一端采用VSC换流器形成混合直流输电技术，可以综合LCC-HVDC技术成熟，成本低廉，损耗小和VSC-HVDC技术的调节性能好，占地面积小和不存在换相失败故障的优势，将具有广阔的工程应用前景。
混合背靠背直流输电应用中，需要考虑潮流双向输送的情况。为了在潮流正送和反送两种情况下，混合直流输电的逆变侧均不发生换相失败，需要优化混合直流输电系统的结构，并设计相应的潮流反转控制方法。
发明内容
本发明的目的，在于提供一种混合背靠背直流输电系统及其快速潮流反转控制方法，该系统通过配置转换开关或刀闸实现在潮流正送或反送情况下，使VSC换流器始终逆变运行，避免了LCC换流器逆变运行可能出现的换相失败问题，同时还提供了通过转换刀闸实现快速潮流反转的控制方法。
为了达成上述目的，本发明采用的技术方案是：
一种混合背靠背直流输电系统，包括背靠背连接的LCC换流器和VSC换流器，还包括第一至第四转换刀闸以及第一、第二交流系统母线，所述第一交流系统母线分别与第一转换刀闸、第二转换刀闸的一端相连接，第一转换刀闸的另一端分别与LCC换流器、第四转换刀闸的一端相连接，第二转换刀闸的另一端分别与VSC换流器、第三转换刀闸的一端相连接，第二交流系统母线分别与第三转换刀闸的另一端、第四转换刀闸的另一端相连接；
功率正送时，第一转换刀闸、第三转换刀闸闭合，第二转换刀闸、第四转换刀闸分开；
功率反送时，第一转换刀闸、第三转换刀闸分开，第二转换刀闸、第四转换刀闸闭合。
作为本发明的进一步优选方案，所述的第一至第四转换刀闸，均为隔离刀闸或断路器，或隔离刀闸和断路器的组合。
作为本发明的进一步优选方案，所述背靠背连接的LCC换流器和VSC换流器直流侧存在至少一个接地点,或者VSC换流器阀侧存在至少一个接地点。
作为本发明的进一步优选方案，所述VSC换流器阀侧存在至少一个接地点是指VSC换流器联结变阀侧交流场采用星形电抗加中性点经电阻接地，或者VSC换流器联结变阀侧绕组中性点经电阻接地。
本发明还提供了基于上述混合背靠背直流输电系统的潮流反转控制方法，所述潮流反转控制方法包括如下步骤：
(1)如接受到潮流反转指令，则进入步骤(2)，否则继续处于步骤(1)；
(2)发出停运命令使混合背靠背直流输电系统的LCC和VSC换流器闭锁，进入步骤(3)；
(3)如功率由正送转为反送，进入步骤(4)，如功率由反送转为正送，进入步骤(5)；
(4)断开第一转换刀闸Q1、第二转换刀闸Q2、第三转换刀闸Q3及第四转换刀闸Q4，等待设定的反转延时后，闭合第二转换刀闸Q2、第四转换刀闸Q4，进入步骤(6)；
(5)断开第一转换刀闸Q1、第二转换刀闸Q2、第三转换刀闸Q3及第四转换刀闸Q4，等待设定的反转延时后，闭合第一转换刀闸Q1、第三转换刀闸Q3，进入步骤(6)；
(6)重新运行混合背靠背直流输电系统。
上述潮流反转控制方法中，所述设定的反转延时的具体延时时间根据系统分析确定。
采用上述方案后，本发明的有益效果为：
(1)通过采用转换刀闸能够保证不管功率正送还是反送时，VSC换流器始终为逆变运行，避免了LCC换流器逆变运行时容易出现的换相失败问题；
(2)快速潮流反转过程实现简单、可靠。
附图说明
图1是本发明提供的一种混合背靠背直流输电系统示意图；
图2是本发明提供的一种直流侧接地的混合背靠背直流输电拓扑示意图；
图3是本发明提供的一种LCC换流器中点接地，VSC换流器通过阻抗接地的混合背靠背直流输电拓扑示意图；
图4是本发明提供的一种LCC换流器中点接地，VSC换流器通过换流变中性点接地的混合背靠背直流输电拓扑示意图；
图5是本发明提供的一种LCC换流器中点接地，VSC换流器不接地的混合背靠背直流输电拓扑示意图；
图6是本发明提供的一种LCC换流器不接地，VSC换流器通过阻抗接地的混合背靠背直流输电拓扑示意图；
图7是本发明提供的种LCC换流器不接地，VSC换流器通过换流变中性点接地的混合背靠背直流输电拓扑示意图；
图8是本发明提供的一种混合背靠背直流输电系统的潮流反转方法流程图；
其中：LCC为LCC换流器，VSC为VSC换流器，Q1至Q4分别为第一至第四转换刀闸，B1、B2分别为第一、第二交流系统的母线。
具体实施方式
以下将结合附图及具体实施例，对本发明的技术方案进行详细说明。
附图1为本发明提供的一种混合背靠背直流输电系统示意图。所述混合背靠背直流输电系统包括通过平波电抗器L背靠背连接的LCC换流器和VSC换流器构成的背靠背输电拓扑，第一转换刀闸Q1、第二转换刀闸Q2、第三转换刀闸Q3和第四转换刀闸Q4；第一转换刀闸Q1一端与第一交流系统的母线B1连接，另一端与LCC换流器的交流侧连接；第二转换刀闸Q2一端与第一交流系统的母线B1连接，另一端与VSC换流器的交流侧连接；第三转换刀闸Q3一端与第二交流系统的母线B2连接，另一端与VSC换流器的交流侧连接；第四转换刀闸Q4一端与第二交流系统的母线B2连接，另一端与LCC换流器的交流侧连接。
定义上述混合背靠背直流输电系统中，有功功率从第一交流系统流向第二交流系统为功率正送，反之为功率反送；功率正送时，第一转换刀闸Q1、第三转换刀闸Q3闭合，第二转换刀闸Q2、第四转换刀闸Q4分开；功率反送时，第一转换刀闸Q1、第三转换刀闸Q3分开，第二转换刀闸Q2、第四转换刀闸Q4闭合。这样不管功率正送还是反送，VSC换流器始终作为受端出于逆变运行，可避免LCC换流器逆变运行方式下易发生换相失败的问题。
上述混合背靠背直流输电系统中，所述的第一转换刀闸Q1、第二转换刀闸Q2、第三转换刀闸Q3、第四转换刀闸Q4，为隔离刀闸或断路器，或隔离刀闸和断路器的组合。上述混合背靠背直流输电系统中，所述的连接关系可通过导线直接连接，也可通过其他的开关或刀闸间接连接，在所述的其他的开关或刀闸闭合时等效为导线直接连接。
上述包括通过平波电抗器L背靠背连接的LCC换流器和VSC换流器构成的背靠背输电拓扑背靠背输电拓扑，可以是图2-图7几种形式的。
附图2是本发明提供的一种直流侧接地的混合背靠背直流输电拓扑示意图；LCC换流器采用十二脉动桥式电路；其中，每个桥臂均由若干个晶闸管串联构成；LCC换流器通过一台接线方式分别为Y0/Y/Δ的三绕组变压器与送端交流电网连接。变压器能够对送端交流系统的三相交流电进行电压等级变换，以适应所需的直流电压等级，变压器副边接线方式的不同为十二脉动桥式晶闸管换流器的上下两个六脉动换流桥提供相角差为30°的三相交流电，以减少流入电网的谐波电流。VSC换流器通过一台接线方式为Y0/Δ的双绕组变压器与受端交流电网连接。LCC换流器和VSC换流器通过平波电抗器L背靠背连接，直流侧正极线或者负极线连接接地点。
附图3是本发明提供的一种LCC换流器中点接地，VSC换流器通过阻抗接地的混合背靠背直流输电拓扑示意图；LCC换流器采用十二脉动桥式电路；其中，每个桥臂均由若干个晶闸管串联构成；十二脉动桥式换流器的上下两个六脉动换流桥的中间连接接地点，LCC换流器通过一台接线方式分别为Y0/Y/Δ的三绕组变压器与送端交流电网连接。变压器能够对送端交流系统的三相交流电进行电压等级变换，以适应所需的直流电压等级，变压器副边接线方式的不同为十二脉动桥式晶闸管换流器的上下两个六脉动换流桥提供相角差为30°的三相交流电，以减少流入电网的谐波电流。VSC换流器通过一台接线方式为Y0/Δ的双绕组变压器与受端交流电网连接。VSC换流器阀侧通过星形电抗+中性点接地电阻的方式接地。LCC换流器和VSC换流器通过平波电抗器L背靠背连接。
附图4是本发明提供的一种LCC换流器中点接地，VSC换流器通过换流变中性点接地的混合背靠背直流输电拓扑示意图；LCC换流器采用十二脉动桥式电路；其中，每个桥臂均由若干个晶闸管串联构成；十二脉动桥式换流器的上下两个六脉动换流桥的中间连接接地点，LCC换流器通过一台接线方式分别为Y0/Y/Δ的三绕组变压器与送端交流电网连接。 变压器能够对送端交流系统的三相交流电进行电压等级变换，以适应所需的直流电压等级，变压器副边接线方式的不同为十二脉动桥式晶闸管换流器的上下两个六脉动换流桥提供相角差为30°的三相交流电，以减少流入电网的谐波电流。VSC换流器通过一台接线方式为Δ/Y0的双绕组变压器与受端交流电网连接，变压器阀侧中性点采用电阻接地方式或直接接地方式。LCC换流器和VSC换流器通过平波电抗器L背靠背连接。
附图5是本发明提供的一种LCC换流器中点接地，VSC换流器不接地的混合背靠背直流输电拓扑示意图；LCC换流器采用十二脉动桥式电路；其中，每个桥臂均由若干个晶闸管串联构成；十二脉动桥式换流器的上下两个六脉动换流桥的中间连接接地点，LCC换流器通过一台接线方式分别为Y0/Y/Δ的三绕组变压器与送端交流电网连接。变压器能够对送端交流系统的三相交流电进行电压等级变换，以适应所需的直流电压等级，变压器副边接线方式的不同为十二脉动桥式晶闸管换流器的上下两个六脉动换流桥提供相角差为30°的三相交流电，以减少流入电网的谐波电流。VSC换流器通过一台接线方式为Δ/Y0的双绕组变压器与受端交流电网连接，VSC换流器侧不接地，LCC换流器和VSC换流器通过平波电抗器L背靠背连接。
附图6是本发明提供的一种LCC换流器不接地，VSC换流器通过阻抗接地的混合背靠背直流输电拓扑示意图；LCC换流器采用十二脉动桥式电路；其中，每个桥臂均由若干个晶闸管串联构成；LCC换流器通过一台接线方式分别为Y0/Y/Δ的三绕组变压器与送端交流电网连接。变压器能够对送端交流系统的三相交流电进行电压等级变换，以适应所需的直流电压等级，变压器副边接线方式的不同为十二脉动桥式晶闸管换流器的上下两个六脉动换流桥提供相角差为30°的三相交流电，以减少流入电网的谐波电流，LCC换流器侧不接地。VSC换流器通过一台接线方式为Y0/Δ的双绕组变压器与受端交流电网连接。VSC换流器阀侧通过星形电抗+中性点接地电阻的方式接地。LCC换流器和VSC换流器通过平波电抗器L背靠背连接。
附图7是本发明提供的种LCC换流器不接地，VSC换流器通过换流变中性点接地的混合背靠背直流输电拓扑示意图；LCC换流器采用十二脉动桥式电路；其中，每个桥臂均由若干个晶闸管串联构成；LCC换流器通过一台接线方式分别为Y0/Y/Δ的三绕组变压器与送端交流电网连接。变压器能够对送端交流系统的三相交流电进行电压等级变换，以适应所需的直流电压等级，变压器副边接线方式的不同为十二脉动桥式晶闸管换流器的上下两个六脉动换流桥提供相角差为30°的三相交流电，以减少流入电网的谐波电流，LCC换流器侧不接地。VSC换流器通过一台接线方式为Y0/Δ的双绕组变压器与受端交流电网连接，变压器阀侧中性点采用电阻接地方式或直接接地方式。LCC换流器和VSC换流器通过平波电抗器L背靠背连接。
如附图8所示，本发明提供的一种混合背靠背直流输电系统的潮流反转方法包括：
步骤101：如接受到潮流反转指令，则进入步骤102，否则继续处于步骤101；
步骤102：发出停运命令使混合背靠背直流输电系统的LCC和VSC换流器闭锁；
步骤103：功率由正送转为反送，顺次执行步骤104a、104b和104c，如功率由反送转为正送，顺次执行步骤105a、105b和105c；
步骤104a：断开所有转换刀闸，即分开第一转换刀闸Q1、第二转换刀闸Q2、第三转换刀闸Q3和第四转换刀闸Q4；
步骤104b：等待设定的反转延时；
步骤104c：闭合第二转换刀闸Q2、第四转换刀闸Q4，进入步骤106；
步骤105a：断开所有转换刀闸，即分开第一转换刀闸Q1、第二转换刀闸Q2、第三转换刀闸Q3和第四转换刀闸Q4；
步骤105b：等待设定的反转延时；
步骤105c：闭合第一转换刀闸Q1、第三转换刀闸Q3，进入步骤106；
步骤106：重新运行混合背靠背直流输电系统。
上述步骤104b和步骤105b中，反转延时的具体延时时间需根据系统分析确定，例如需考虑换流器阻尼回路的放电时间，交流滤波器再次投入前电容的放电时间等，较优的取值范围为1s至60min。
以上实施例仅为说明本发明的技术思想，不能以此限定本发明的保护范围，凡是按照本发明提出的技术思想，在技术方案基础上所做的任何改动，均落入本发明保护范围之内。

Claims (5)

  1. 一种混合背靠背直流输电系统，其特征在于：包括背靠背连接的LCC换流器和VSC换流器，还包括第一至第四转换刀闸以及第一、第二交流系统母线，所述第一交流系统母线分别与第一转换刀闸、第二转换刀闸的一端相连接，第一转换刀闸的另一端分别与LCC换流器、第四转换刀闸的一端相连接，第二转换刀闸的另一端分别与VSC换流器、第三转换刀闸的一端相连接，第二交流系统母线分别与第三转换刀闸的另一端、第四转换刀闸的另一端相连接；
    功率正送时，第一转换刀闸、第三转换刀闸闭合，第二转换刀闸、第四转换刀闸分开；
    功率反送时，第一转换刀闸、第三转换刀闸分开，第二转换刀闸、第四转换刀闸闭合。
  2. 如权利要求1所述的一种混合背靠背直流输电系统，其特征在于：所述的第一至第四转换刀闸，均为隔离刀闸或断路器，或隔离刀闸和断路器的组合。
  3. 如权利要求1所述的一种混合背靠背直流输电系统,其特征在于：所述背靠背连接的LCC换流器和VSC换流器直流侧存在至少一个接地点,或者VSC换流器阀侧存在至少一个接地点。
  4. 如权利要求3所述的一种混合背靠背直流输电系统,其特征在于：所述VSC换流器阀侧存在至少一个接地点是指VSC换流器联结变阀侧交流场采用星形电抗加中性点经电阻接地，或者VSC换流器联结变阀侧绕组中性点经电阻接地。
  5. 一种基于权利要求1所述的混合背靠背直流输电系统的潮流反转控制方法，其特征在于：所述潮流反转控制方法包括如下步骤：
    (1)如接受到潮流反转指令，则进入步骤(2)，否则继续处于步骤(1)；
    (2)发出停运命令使混合背靠背直流输电系统的LCC和VSC换流器闭锁，进入步骤(3)；
    (3)如功率由正送转为反送，进入步骤(4)，如功率由反送转为正送，则进入步骤(5)；
    (4)断开第一转换刀闸、第二转换刀闸、第三转换刀闸及第四转换刀闸，等待设定的反转延时后，闭合第二转换刀闸、第四转换刀闸，进入步骤(6)；
    (5)断开第一转换刀闸、第二转换刀闸、第三转换刀闸及第四转换刀闸，等待设定的反转延时后，闭合第一转换刀闸、第三转换刀闸，进入步骤(6)；
    (6)重新运行混合背靠背直流输电系统。
PCT/CN2017/071655 2016-01-28 2017-01-19 一种混合背靠背直流输电系统及潮流反转控制方法 Ceased WO2017129026A1 (zh)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US15/735,204 US10181799B2 (en) 2016-01-28 2017-01-19 Hybrid back-to-back direct current transmission system and power flow reversal control method
KR1020177035965A KR101918693B1 (ko) 2016-01-28 2017-01-19 하이브리드 백-투-백 직류 전송 시스템 및 하이브리드 백-투-백 직류 전송 시스템의 고속 전력 조류 반전 제어 방법
MX2017016240A MX378090B (es) 2016-01-28 2017-01-19 Sistema de transmision de corriente continua hibrido adosado y metodo de control de inversion del flujo de potencia.
RU2017143837A RU2679824C1 (ru) 2016-01-28 2017-01-19 Гибридная система передачи постоянного тока со встречным включением и способ управления передачей потока мощности в обратном направлении
EP17743641.7A EP3293846A4 (en) 2016-01-28 2017-01-19 HYBRID BACK-TO-BACK DC TRANSMISSION SYSTEM AND METHOD FOR ELECTRIC POWER CONTROL
BR112018001501A BR112018001501A2 (pt) 2016-01-28 2017-01-19 sistema de transmissão de corrente contínua consecutiva híbrida e método de controle de reversão de fluxo de energia do sistema de transmissão de corrente contínua consecutiva híbrida
CA2989539A CA2989539C (en) 2016-01-28 2017-01-19 Hybrid back-to-back direct current transmission system and power flow reversal control method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610061214.9A CN105514957B (zh) 2016-01-28 2016-01-28 一种混合背靠背直流输电系统及潮流反转控制方法
CN201610061214.9 2016-01-28

Publications (1)

Publication Number Publication Date
WO2017129026A1 true WO2017129026A1 (zh) 2017-08-03

Family

ID=55722723

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/071655 Ceased WO2017129026A1 (zh) 2016-01-28 2017-01-19 一种混合背靠背直流输电系统及潮流反转控制方法

Country Status (9)

Country Link
US (1) US10181799B2 (zh)
EP (1) EP3293846A4 (zh)
KR (1) KR101918693B1 (zh)
CN (1) CN105514957B (zh)
BR (1) BR112018001501A2 (zh)
CA (1) CA2989539C (zh)
MX (1) MX378090B (zh)
RU (1) RU2679824C1 (zh)
WO (1) WO2017129026A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110071485A (zh) * 2019-04-22 2019-07-30 国网冀北电力有限公司 一种适用于多端柔性变电站的保护配置方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104600738B (zh) * 2015-01-21 2017-02-22 南京南瑞继保电气有限公司 一种高压直流输电串联阀组控制装置
CN105514957B (zh) * 2016-01-28 2017-12-22 南京南瑞继保电气有限公司 一种混合背靠背直流输电系统及潮流反转控制方法
CN105932706B (zh) * 2016-05-31 2018-07-06 中国南方电网有限责任公司超高压输电公司检修试验中心 一种提高混合背靠背直流系统的协调控制方法
CN108736506B (zh) * 2018-08-02 2023-12-01 南方电网科学研究院有限责任公司 一种高压直流输电系统
CN109038589B (zh) * 2018-08-02 2020-05-05 中国电力工程顾问集团西北电力设计院有限公司 一种多省区电网协调运行生产模拟方法
CN110365036B (zh) * 2019-07-23 2020-12-18 许继电气股份有限公司 一种lcc-vsc直流输电系统的功率协调控制方法与装置
CN112993994B (zh) * 2021-03-31 2022-07-08 南方电网科学研究院有限责任公司 交流故障中高压直流首次换相失败的控制方法及装置
CN115246330B (zh) * 2022-07-21 2024-06-21 广西电网有限责任公司电力科学研究院 电动汽车无线充电原边拓扑自适应控制方法及系统

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1881725A (zh) * 2005-06-15 2006-12-20 许继集团有限公司 高压直流输电系统中潮流反转保护方法
CN104638665A (zh) * 2015-03-06 2015-05-20 南京南瑞继保电气有限公司 一种混合直流输电系统潮流反转控制方法及装置
US20150145252A1 (en) * 2013-05-22 2015-05-28 Huazhong University Of Science And Technology Hybrid converter and wind power generating system
CN104795834A (zh) * 2015-04-29 2015-07-22 南京南瑞继保电气有限公司 一种混合直流输电拓扑结构及控制方法
CN104852401A (zh) * 2015-06-02 2015-08-19 南京南瑞继保电气有限公司 一种混合直流输电系统、控制方法及潮流反转控制方法
CN105514957A (zh) * 2016-01-28 2016-04-20 南京南瑞继保电气有限公司 一种混合背靠背直流输电系统及潮流反转控制方法
CN205377273U (zh) * 2016-01-28 2016-07-06 南京南瑞继保电气有限公司 一种混合背靠背直流输电系统

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH490753A (de) * 1968-08-09 1970-05-15 Bbc Brown Boveri & Cie Verfahren zur Energierichtungsumkehr bei Kupplungen von asynchronen Drehstromnetzen
SE514920C2 (sv) * 1997-03-24 2001-05-14 Abb Ab Elkraftanläggning med lik- och växelspänningsnät innefattande detektering av obalanstillstånd hos strömriktare
CN101341642B (zh) * 2005-12-21 2010-12-29 Abb技术有限公司 高压直流系统
WO2008136094A1 (ja) * 2007-04-24 2008-11-13 Mitsubishi Electric Corporation 電気駆動システムおよびハイブリット駆動システム
CN102246379B (zh) * 2008-12-17 2014-03-19 Abb技术有限公司 对用于传输电力的设施进行升级的方法和这样的设施
SE0900830L (sv) * 2009-06-18 2009-06-29 Abb Technology Ag Styrning av en växelriktaranordning för att stödja ett växelströmssystem
US8767422B2 (en) * 2010-06-01 2014-07-01 Abb Technology Ag Interface arrangement between AC and DC systems using grounding switch
US9450412B2 (en) * 2010-12-22 2016-09-20 General Electric Company Method and system for control power in remote DC power systems
CN103683195B (zh) * 2012-09-11 2016-12-21 南京南瑞继保电气有限公司 静止变频器系统输出变压器变频差动保护方法
CN103107551B (zh) * 2013-01-25 2014-12-03 华北电力大学 一种用于海上风力发电电能送出的拓扑电路
RU129721U1 (ru) * 2013-03-13 2013-06-27 Михаил Александрович Коваленко Асинхронный двунаправленный обратноходовой преобразователь постоянного напряжения
US9099936B2 (en) * 2013-03-14 2015-08-04 General Electric Company High voltage direct current (HVDC) converter system and method of operating the same
CN104218543B (zh) * 2013-05-30 2016-12-28 南京南瑞继保电气有限公司 电流源型变流器差动保护方法
CN103532162B (zh) * 2013-09-23 2015-09-16 武汉大学 基于控制切换的混合直流输电系统的拓扑结构及启动方法
CN103532163B (zh) * 2013-09-23 2015-09-16 武汉大学 基于极性切换的混合直流输电系统拓扑结构及启动方法
WO2015051817A1 (de) * 2013-10-07 2015-04-16 Siemens Aktiengesellschaft Anlage zum übertragen elektrischer leistung
CN103840479B (zh) * 2013-12-16 2016-09-14 南方电网科学研究院有限责任公司 一种基于vsc-hvdc的交直流并联系统启动控制方法
CN103701145B (zh) * 2014-01-02 2015-07-08 浙江大学 一种基于混杂式mmc的混合型直流输电系统
CN103972887B (zh) * 2014-05-19 2017-07-18 南京南瑞继保电气有限公司 一种适用于双回线路的统一潮流控制器
CN105098812B (zh) * 2014-05-22 2018-03-30 南京南瑞继保电气有限公司 一种三极柔性直流输电系统和方法
CN104362662B (zh) * 2014-11-26 2016-08-24 湖北工业大学 一种lcc-vsc型混合直流输电系统拓扑结构及启动方法
CN104578131B (zh) * 2015-01-08 2017-05-17 南京南瑞继保电气有限公司 一种直流输电自动潮流反转控制方法
CN104821596A (zh) * 2015-05-21 2015-08-05 国家电网公司 一种基于内模控制的混合直流输电系统拓扑及控制方法
US10097002B2 (en) * 2015-06-30 2018-10-09 Abb Schweiz Ag Power transmission arrangement and method for operating a power transmission arrangement
CN104993509B (zh) * 2015-07-20 2017-07-25 Abb技术有限公司 混合多端直流输电系统及其逆变站和控制方法
CN105071425B (zh) * 2015-07-28 2017-08-25 国家电网公司 一种基于lcc和mmc的混合直流输电系统
CN105262125B (zh) * 2015-11-12 2018-02-13 南方电网科学研究院有限责任公司 混合直流输电拓扑系统

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1881725A (zh) * 2005-06-15 2006-12-20 许继集团有限公司 高压直流输电系统中潮流反转保护方法
US20150145252A1 (en) * 2013-05-22 2015-05-28 Huazhong University Of Science And Technology Hybrid converter and wind power generating system
CN104638665A (zh) * 2015-03-06 2015-05-20 南京南瑞继保电气有限公司 一种混合直流输电系统潮流反转控制方法及装置
CN104795834A (zh) * 2015-04-29 2015-07-22 南京南瑞继保电气有限公司 一种混合直流输电拓扑结构及控制方法
CN104852401A (zh) * 2015-06-02 2015-08-19 南京南瑞继保电气有限公司 一种混合直流输电系统、控制方法及潮流反转控制方法
CN105514957A (zh) * 2016-01-28 2016-04-20 南京南瑞继保电气有限公司 一种混合背靠背直流输电系统及潮流反转控制方法
CN205377273U (zh) * 2016-01-28 2016-07-06 南京南瑞继保电气有限公司 一种混合背靠背直流输电系统

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3293846A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110071485A (zh) * 2019-04-22 2019-07-30 国网冀北电力有限公司 一种适用于多端柔性变电站的保护配置方法

Also Published As

Publication number Publication date
CA2989539A1 (en) 2017-08-03
CA2989539C (en) 2019-08-20
CN105514957A (zh) 2016-04-20
MX2017016240A (es) 2018-08-15
EP3293846A4 (en) 2019-01-23
KR20180004272A (ko) 2018-01-10
KR101918693B1 (ko) 2018-11-15
EP3293846A1 (en) 2018-03-14
US20180175739A1 (en) 2018-06-21
MX378090B (es) 2025-03-10
RU2679824C1 (ru) 2019-02-13
BR112018001501A2 (pt) 2018-09-11
CN105514957B (zh) 2017-12-22
US10181799B2 (en) 2019-01-15

Similar Documents

Publication Publication Date Title
WO2017129026A1 (zh) 一种混合背靠背直流输电系统及潮流反转控制方法
EP4131762B1 (en) Interconnected co-phase traction power supply system based on four-port modular multilevel converter
RU2748367C1 (ru) Цепь, способ и устройство для поточного ввода группы вентилей гибридного преобразователя постоянного тока
Oni et al. A review of LCC-HVDC and VSC-HVDC technologies and applications
CN105098812B (zh) 一种三极柔性直流输电系统和方法
CN104795834B (zh) 一种混合直流输电拓扑结构及控制方法
CN104852401B (zh) 一种混合直流输电系统、控制方法及潮流反转控制方法
Reed et al. Advantages of voltage sourced converter (VSC) based design concepts for FACTS and HVDC-link applications
CN111446866B (zh) 基于平衡变压器和四端口mmc的贯通同相牵引供电系统
CN205377273U (zh) 一种混合背靠背直流输电系统
CN107069679A (zh) 一种对称双极mmc直流侧单极接地故障穿越和恢复方法
WO2017152720A1 (zh) 一种混合直流输电系统控制方法及装置
CN111555333B (zh) 直流调压单元的控制方法及控制装置
CN107706894B (zh) 一种真双极柔性直流输电工程的单极故障隔离系统
CN109742783B (zh) 混合直流输电系统电压源型换流器在线退出方法及装置
CN106208128A (zh) 一种混合三端高压直流输电系统的功率反转方法
CN110635468A (zh) 一种远海风电场拓扑结构及其控制方法
CN104796025B (zh) 一种模块化多电平换流器子模块拓扑结构
CN107359638A (zh) 一种具备无级调节直流电压的多端口直流‑直流变压系统
Liang et al. A review of DC/DC converter based on MMC
CN110912175A (zh) 一种混合四端高压直流输电系统
Zhou et al. The development of HVDC transmission system
CN119965942B (zh) 混合直流输电阀组、直流输电系统、控制装置及控制方法
CN207603211U (zh) 一种三端直流输电系统
Nandan et al. HVDC transmission system using 6-pulse IGBT converter

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17743641

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2989539

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 2017743641

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 15735204

Country of ref document: US

ENP Entry into the national phase

Ref document number: 20177035965

Country of ref document: KR

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: MX/A/2017/016240

Country of ref document: MX

WWE Wipo information: entry into national phase

Ref document number: 2017143837

Country of ref document: RU

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112018001501

Country of ref document: BR

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 112018001501

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20180124