DC Fault Ride-Through Coordinated Control Strategies for Bipolar MMC-MTDC System with Wind Power Connected

doi:10.12204/j.issn.1000-7229.2022.10.003

Abstract

Abstract:

Because DC system usually adopts overhead line for DC transmission, its failure rate is high. When a single-pole short-circuit grounding fault occurs in the system, the unbalanced power of the fault pole can be transferred to the non-fault pole through the real-bipolar wiring mode. The unbalanced power can be divided into self-absorption and collaborative absorption according to the power margin of the converter station. For the self-absorption situation, fault ride-through can be realized by power transfer between sending end bipolar converter stations. For the situation of collaborative absorption, the coordinated control strategies between converter station and energy dissipation resistance are designed. Considering the limited input time of energy dissipation resistance, unbalanced power in DC System is reduced by sub-sequent generator cutting. Finally, the effectiveness of the proposed control strategy is verified in PSCAD. The simulation results show that the strategy can effectively avoid the expansion of fault range and ensure the safe operation of the system.

Key words: flexible high voltage direct current, real-bipolar wiring mode, fault ride-through, coordinated control strategy, unbalanced power

CLC Number:

TM721

WANG Zhenhao, LI Jinlun, WANG Xinduo, WANG Wei, LI Guoqing. DC Fault Ride-Through Coordinated Control Strategies for Bipolar MMC-MTDC System with Wind Power Connected[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(10): 26-36.

Figures/Tables 13

Fig.1 Structure of real-bipolar MMC-MTDC for wind power grid-connection

Fig.2 Analysis of fault ride-through safety margin for systems with different methods

Fig.3 Voltage comparison of DC grid at no-fault pole under different methods

Fig.4 Control chart of converter station at non-fault pole

Fig.5 Voltage comparison of DC grid at fault pole under different control strategies

Fig.6 Block diagram of active power-voltage control

Fig.7 Input control strategy of energy dissipation resistance

Fig.8 Removal control strategy of energy dissipation resistance

Fig.9 Basic flow chart of DC fault ride-through

Table 1 Parameters of converters in DC grid

Fig.10 Comparison of permanent fault simulation under self-absorption

Fig.11 Comparison of transient fault simulation under collaborative absorption

Fig.12 Comparison of permanent fault simulation under collaborative absorption

References 22

[1]	曹帅, 向往, 左文平, 等. 风电经柔性直流电网外送系统的交流故障诊断与穿越控制策略[J]. 中国电机工程学报, 2021, 41(4): 1295-1306, 1537.
	CAO Shuai, XIANG Wang, ZUO Wenping, et al. AC fault diagnosis and ride-trough control strategy for the wind power delivery system via HVDC grid[J]. Proceedings of the CSEE, 2021, 41(4): 1295-1306, 1537.
[2]	武文强, 贾科, 陈金锋, 等. 基于谐波注入信息传递的海上风电柔直并网故障穿越方法[J]. 电力系统自动化, 2021, 45(21): 112-119.
	WU Wenqiang, JIA Ke, CHEN Jinfeng, et al. Fault ride-through method based on information transmission by harmonic injection for flexible DC integration of offshore wind power[J]. Automation of Electric Power Systems, 2021, 45(21): 112-119.
[3]	黄阮明, 迟永宁, 汪军, 等. 直流断线故障下海上风电经柔性直流送出系统的暂态特性[J]. 电力建设, 2021, 42(4): 97-104. doi: 10.12204/j.issn.1000-7229.2021.04.011
	HUANG Ruanming, CHI Yongning, WANG Jun, et al. Transient characteristics of offshore wind power sending system via flexible HVDC transmission system under DC line breakage fault[J]. Electric Power Construction, 2021, 42(4): 97-104. doi: 10.12204/j.issn.1000-7229.2021.04.011
[4]	徐进, 金逸, 胡从川, 等. 适用于海上风电并网的多端柔性直流系统自适应下垂控制研究[J]. 电力系统保护与控制, 2018, 46(4): 78-85.
	XU Jin, JIN Yi, HU Congchuan, et al. DC voltage adaptive droop control of multi-terminal VSC-HVDC system for offshore wind farms integration[J]. Power System Protection and Control, 2018, 46(4): 78-85.
[5]	汪军, 姚骏, 刘凯, 等. 双极短路故障下海上风电MMC-HVDC并网系统的暂态运行特性[J]. 高电压技术, 2021, 47(10): 3755-3765.
	WANG Jun, YAO Jun, LIU Kai, et al. Transient operation characteristics of offshore wind power generation integration system with MMC-HVDC under pole-to-pole short-circuit fault[J]. High Voltage Engineering, 2021, 47(10): 3755-3765.
[6]	MOAWWAD A, EL MOURSI M S, XIAO W D. Advanced fault ride-through management scheme for VSC-HVDC connecting offshore wind farms[J]. IEEE Transactions on Power Systems, 2016, 31(6): 4923-4934. doi: 10.1109/TPWRS.2016.2535389 URL
[7]	陈争光, 周泽昕, 王兴国, 等. 混合多端直流输电系统线路保护方案研究[J]. 电网技术, 2019, 43(7): 2617-2622.
	CHEN Zhengguang, ZHOU Zexin, WANG Xingguo, et al. Research on protection scheme of hybrid multi-terminal DC transmission lines[J]. Power System Technology, 2019, 43(7): 2617-2622.
[8]	PANG H, WEI X G.Research on key technology and equipment for Zhangbei 500 kV DC grid[C]// 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia). Niigata:IEEE, 2018: 2343-2351.
[9]	李道洋, 姚为正, 吴金龙, 等. 应用于海上风电场柔性直流接入系统的直流故障穿越协同控制策略[J]. 电网技术, 2016, 40(1): 47-54.
	LI Daoyang, YAO Weizheng, WU Jinlong, et al. Coordinated DC fault ride-through control strategy for offshore wind farm interconnection with flexible HVDC[J]. Power System Technology, 2016, 40(1): 47-54.
[10]	董旭, 张峻榤, 王枫, 等. 风电经架空柔性直流输电线路并网的交直流故障穿越技术[J]. 电力系统自动化, 2016, 40(18): 48-55.
	DONG Xu, ZHANG Junjie, WANG Feng, et al. AC and DC fault ride-through technology for wind power integration via VSC-HVDC overhead lines[J]. Automation of Electric Power Systems, 2016, 40(18): 48-55.
[11]	李国庆, 张林, 江守其, 等. 风电经双极混合型MMC-HVDC并网的直流故障穿越协调控制策略[J]. 电力系统保护与控制, 2021, 49(10): 27-36.
	LI Guoqing, ZHANG Lin, JIANG Shouqi, et al. Coordinated control strategies for DC fault ride-through of wind power integration via bipolar hybrid MMC-HVDC overhead lines[J]. Power System Protection and Control, 2021, 49(10): 27-36.
[12]	陈宁, 齐磊, 崔翔, 等. 柔性直流电网单极接地短路电流计算方法[J]. 电力建设, 2019, 40(4): 119-127. doi: 10.3969/j.issn.1000-7229.2019.04.014
	CHEN Ning, QI Lei, CUI Xiang, et al. Calculation method for line-to-ground short-circuit currents of VSC-HVDC grid[J]. Electric Power Construction, 2019, 40(4): 119-127. doi: 10.3969/j.issn.1000-7229.2019.04.014
[13]	何炎, 李周, 李亚州, 等. 基于真双极接线的VSC-MTDC系统功率转代策略[J]. 电力系统自动化, 2017, 41(19): 95-101.
	HE Yan, LI Zhou, LI Yazhou, et al. Power conversion strategy of VSC-MTDC system based on real bipolar wiring mode[J]. Automation of Electric Power Systems, 2017, 41(19): 95-101.
[14]	江守其, 李国庆, 辛业春, 等. 提升柔性直流电网盈余功率消纳能力的协调控制策略[J]. 高电压技术, 2021, 47(12): 4471-4482.
	JIANG Shouqi, LI Guoqing, XIN Yechun, et al. Coordinated control strategies to enhance the capability of surplus power consumption for DC grid[J]. High Voltage Engineering, 2021, 47(12): 4471-4482.
[15]	曹帅, 向往, 林卫星, 等. 含风电的真双极混合型MMC-MTDC系统故障穿越及能量耗散控制[J]. 电力系统保护与控制, 2019, 47(7): 39-48.
	CAO Shuai, XIANG Wang, LIN Weixing, et al. Fault ride-through and energy dissipation control of bipolar hybrid MMC-MTDC integrating wind farms[J]. Power System Protection and Control, 2019, 47(7): 39-48.
[16]	张福轩, 郭贤珊, 汪楠楠, 等. 接入新能源孤岛系统的双极柔性直流系统盈余功率耗散策略[J]. 电力系统自动化, 2020, 44(5): 154-160.
	ZHANG Fuxuan, GUO Xianshan, WANG Nannan, et al. Surplus power dissipation strategy for bipolar VSC-HVDC system with integration of islanded renewable energy generation system[J]. Automation of Electric Power Systems, 2020, 44(5): 154-160.
[17]	黄智达, 石兆麒, 梅勇. 多端柔性直流输电系统动态协调优化控制策略[J]. 智慧电力, 2020, 48(2): 45-52.
	HUANG Zhida, SHI Zhaoqi, MEI Yong. Dynamic coordination optimization control strategy for MMC-MTDC systems[J]. Smart Power, 2020, 48(2): 45-52.
[18]	熊凌飞, 韩民晓. 基于组合方式的多端柔性直流输电系统控制策略[J]. 电网技术, 2015, 39(6): 1586-1592.
	XIONG Lingfei, HAN Minxiao. A novel combined control strategy for VSC-MTDC[J]. Power System Technology, 2015, 39(6): 1586-1592.
[19]	李周, 李亚州, 陆于平, 等. 多端柔性直流电网主动功率平衡协调控制策略[J]. 电力系统自动化, 2019, 43(17): 117-124.
	LI Zhou, LI Yazhou, LU Yuping, et al. Active power balance oriented coordinating control strategy for VSC-MTDC system[J]. Automation of Electric Power Systems, 2019, 43(17): 117-124.
[20]	朱瑞可, 王渝红, 李兴源, 等. VSC-MTDC系统直流电压自适应斜率控制策略[J]. 电力系统自动化, 2015, 39(4): 63-68.
	ZHU Ruike, WANG Yuhong, LI Xingyuan, et al. An adaptive DC voltage droop control strategy for the VSC-MTDC system[J]. Automation of Electric Power Systems, 2015, 39(4): 63-68.
[21]	杜晓磊, 蔡巍, 张静岚, 等. 柔直电网孤岛运行方式下换流阀闭锁时交流耗能装置投切仿真研究[J]. 全球能源互联网, 2019, 2(2): 179-185.
	DU Xiaolei, CAI Wei, ZHANG Jinglan, et al. Simulation study on switching on energy dissipation device during unipolar blocking under isolated island operation in VSC-HVDC power grid[J]. Journal of Global Energy Interconnection, 2019, 2(2): 179-185.
[22]	杨兵建, 张迪, 林志光, 等. 500kV混合式高压直流断路器控制保护及其动模试验[J]. 高电压技术, 2020, 46(10): 3440-3450.
	YANG Bingjian, ZHANG Di, LIN Zhiguang, et al. Control protection and dynamic model tests for 500 kV hybrid HVDC circuit breaker[J]. High Voltage Engineering, 2020, 46(10): 3440-3450.