含主动限流控制的MMC-HVDC电网直流短路故障电流解析计算

doi:10.19595/j.cnki.1000-6753.tces.222081

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Abstract

The traditional short-circuit fault current analytical calculation of MMC-HVDC grid generally uses equivalent RLC circuit method. However, this method does not consider the influence of ACLC on the RLC parameters of the equivalent circuit, thus it can not be directly applied to the analytical calculation for MMC-HVDC grid with an ACLC. To fill this gap, this paper proposes an analytical calculation method for DC short-circuit fault current of MMC-HVDC grid with anACLC by establishing the relationship between the control effect and RLC parameters in the equivalent RLC circuit. Firstly, the control principle of thetypicalACLC is analyzed, concluding that the essence of ACLC's principle is to reduce the outlet DCvoltages of converter stations bydynamicallyreducingthe inputting number of sub-modules oftheconverters. Secondly, by mapping the voltage drop resulted from ACLC to the voltage drop generated by the introduced virtual impedance in the equivalent RLC circuit, the DC short-circuit fault loop can be equivalent to the RLC circuit with the virtual impedance within 10 msafter the pole to pole short-circuit fault occurs. Then, the virtual impedance value can be determined according to the parameters of the current limiting controller, and the analytical solution of the DC short-circuit fault current can be found according to the known RLC parameters and the derived virtual impedance value. Thirdly, taking the four-terminal MMC-HVDC grid withthe ACLC with current limiting link of current change rate as an example, the equivalent RLC circuit with the virtual impedance is derived according to the relationship between the control parameters of the ACLC and the virtual impedance, thus, the analytical solution of the DC short-circuit fault current is obtained. Finally, taking the four-terminal MMC-HVDC grid based on half bridge as an example, the PSCAD/EMTDC simulation model is established to validate the proposed method. The calculation results of DC short-circuit fault current of MMC-HVDC grid with ACLC bythe proposed method arecompared with the electromagnetic transient simulation results of DC short-circuit fault current under different fault points and different parameters by PSCAD/EMTDC model.
According to the simulation analysis results, the following conclusions are obtained:
(1) By mapping the DC voltage drop at the outlet of the converter station with the ACLC to the voltage drop generated by the equivalent virtual impedance, the pole to pole short-circuit fault circuit can be equivalent to the RLC discharge circuit with virtual impedance, thus the equivalent RLC circuit model with ACLC characteristics can be derived. (2)Using the virtual inductance mapping method (Experiment 1), the average relative error of DC fault current within 10ms is below 3.31% under different DC short-circuit fault scenarios. Using the virtual impedance mapping method (Experiment 2), the average relative error of fault current within 10ms is below 8.29% under different DC short-circuit fault scenarios. Thus, the calculation method proposed in this paper has good engineering practicability. (3) But,when analyzing the equivalent RLC circuit with virtual impedance, the influence of the dynamic characteristics of circulating current suppressor on the equivalent virtual impedance is ignored. Therefore, the influence of circulating current suppressor on fault current calculation method can be considered in future work to further improve the calculation accuracy of theDCfaultcurrentbytheproposed method. (4) Although this paper uses specific ACLC algorithm of current limiting link type with current change rate to show the idea of the proposed method, this method can be extended to analyze the short-circuit fault current calculation problem of other types of ACLC algorithms.

Key words： MMC-HVDC active current limiting control virtual impedance RLC circuit DC short circuit fault current calculation

Received: 03 November 2022

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TM721.1

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	Wu Lili
	Mao Meiqin
	Shi Yong

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Wu Lili,Mao Meiqin,Shi Yong. AnalyticalCalculation of DC Short-Circuit Fault Current of Modular Multi-Level Converter-HVDC Grid with Active Current Limiting Control[J]. Transactions of China Electrotechnical Society, 0, (): 8913-.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.222081 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/8913

[1] 严胜,罗湘,贺之渊.直流电网核心装备及关键技术展望[J].电力系统自动化,2019,43(03):205-215.
Yan Sheng, Luo Xiang, HeZhiyuan. Prospect of core equipment and key technologies of DC power grid[J] Power system automation, 2019,43(03): 205-215.
[2] CICRE B4-52 Working Group. HVDC grid feasibility study[R]. B4-52 Working Group. HVDC grid feasibility study[R]. Melbourne: International Council on Large Electric Systems, 2013.
[3] 陈继开,孙川,李国庆,等.双极MMC-HVDC系统直流故障特性研究[J].电工技术学报,2017,32(10):53-60.
Chen Jikai, Sun Chuan, Li Guoqing, et al.Study on DC fault characteristics of bipolar MMC-HVDC system[J]. Journal of electrotechnics, 2017, 32(10):53-60.
[4] 黄强,邹贵彬,高磊,等.基于HB-MMC的直流电网直流线路保护技术研究综述[J].电网技术,2018,42(9):2830-2840.
Huang Qiang, Zou Guibin, Gao Lei, et al.Research summary of DC line protection technology in DC power grid based on HB-MMC[J]. Power grid technology, 2018,42(9): 2830-2840.
[5] 陈磊,何慧雯,王磊,等.基于半桥型MMC的柔性直流电网故障限流方法综述[J].电力系统保护与控制,2021,49(21):175-186.
Chen Lei, HeHuiwen, Wang Lei, et al. Summary of fault current limiting methods for flexible DC power grid based on half bridge MMC[J]. Power system protection and control, 2021,49(21): 175-186.
[6] 茆美琴,程德健,袁敏,等.基于暂态能量流的模块化多电平高压直流电网接地优化配置[J].电工技术学报,2022,37(3):739-749.
Mao Meiqin, Cheng Dejian, Yuan Min, et al.Optimal grounding configuration of modular multilevel HVDC network based on transient energy flow[J]. Journal of electrotechnics, 2022, 37(3): 739-749.
[7] 周光阳, 李妍, 何大瑞,等.含限流器的多端柔直系统故障保护策略[J]. 电工技术学报, 2020, 35(7): 1432-1443.
ZhouGuangyang, Li Yan, HeDarui, et al. Protection scheme for VSC-MTDC system with fault current limiter[J]. Transactions of China Electrotechnical Society, 2020, 35(7): 1432-1443.
[8] Mao Meiqin, Lu Hui, Cheng Dejian, et al.Optimal allocation of fault current limiter in MMC-HVDC grid based on transient energy flow[J]. CSEE Journal of Power and Energy Systems, 2020.
[9] 郑涛,吴琼,吕文轩,等. 基于主动限流控制的直流配电网保护及故障隔离方案[J].电力系统自动化, 2020, 44(5): 114-121.
Zheng Tao, Wu Qiong, Lü Wenxuan, et al.DC distribution network protection and fault isolation scheme based on active current limiting control[J]. Power system automation, 2020, 44(5): 114-121.
[10] 韩杰祥,张哲,冉启胜,等.低压直流配电网主动限流控制及保护方案[J].电力系统自动化,2022,46(9):182-190.
Han Jiexiang, Zhang Zhe, Ran Qisheng, et al.Active current limiting control and protection scheme for low voltage DC distribution network[J]. Power system automation,2022,46(9):182-190.
[11] 张帆,许建中,苑宾,等.基于虚拟阻抗的MMC交、直流侧故障过电流抑制方法[J]. 中国电机工程学报, 2016, 36(8): 2103-2113.
Zhang Fan, Xu Jianzhong, Yuan Bin, et al.Over current suppression control for AC and DC faults of modular multilevel converters based on virtual impedance[J]. Proceedings of the CSEE, 2016, 36(8): 2103-2113.
[12] 唐欣, 海帆, 湛若水.直流配电网中送端换流器的故障限流控制策略[J]. 高电压技术, 2021, 47(10): 424-3429.
Tang Xin, Hai Fan, ZhanRuoshui. Fault current limiting control strategy of sending end converter in DC distribution network[J] High Voltage Technology, 2021, 47(10): 3424-3429.
[13] 吴琼. 柔性直流配电网故障特性分析及保护原理研究[D].华北电力大学(北京), 2020.
WuQiong. Research on fault characteristic analysis and protection principle of flexible DC distribution network[D]. North China Electric Power University (Beijing), 2020.
[14] 樊强,赵西贝,赵成勇,等.模块化多电平换流器自适应故障限流控制策略[J].电力系统自动化, 2021, 45(17):126-133.
FanQiang, ZhaoXibei, ZhaoChengyong, et al. Adaptive fault current limiting control strategy for modular multilevel converter[J]. Power System Automation, 2021, 45(17): 126-133.
[15] 倪斌业, 向往, 周猛, 等. 半桥MMC型柔性直流电网自适应限流控制研究[J].中国电机工程学报, 2020, 40(17): 5609-5619.
Ni Binye, Xiang Wang, Zhou Meng, et al.Research on adaptive current limiting control of half bridge MMC flexible DC power grid[J]. Chinese Journal of Electrical Engineering, 2020, 40(17): 5609-5619.
[16] 李国庆,杨勇,辛业春,等.基于桥臂电压控制的MMC直流短路主动限流方法[J].电网技术,2021,45(1):144-152.
Li Guoqing, Yang Yong, Xin Yechun, et al.MMC DC short-circuit active current limiting method based on bridge arm voltage control[J]. Power Grid Technology, 2021, 45(1):144-152.
[17] Fang Xiongfeng, Hu Zeyu, Xing Yongfei, et al.A DC fault current limiting method for HB-MMC without losing control of AC currents[C]//2021 IEEE 12th Energy Conversion Congress & Exposition-Asia (ECCE-Asia), IEEE, 2021: 279-284.
[18] 丁然,梅军,管州,等.适用于MMC型直流变压器的直流故障主动限流控制方法[J].电力系统自动化, 2018, 42(21): 131-138.
Ding Ran, Mei Jun, Guan Zhou, et al.DC fault active current limiting control method for MMC DC transformer[J]. Power System Automation, 2018, 42(21): 131-138.
[19] Mei Jun, Fan Guanyao, Ge Rui, et al.Research on coordination and optimal configuration of current limiting devices in HVDC grids[J]. IEEE Access, 2019, 7: 106727-106739.
[20] Yang Haiqian, Zeng Hongyan.Modeling on Transient Characteristic and Suppression Control of DC Fault in MMC-HVDC System[C]//IOP Conference Series: Materials Science and Engineering. IOP Publishing, 2018, 394(4): 042117.
[21] 裴翔羽,汤广福,张盛梅,等.双极柔性直流电网短路电流暂态特性分析[J].全球能源互联网,2018,1(04):403-412.
Pei Xiangyu,Tang Guangfu, Zhang Shengmei, et al.Analysis of short-circuit current transient characteristics of bipolar flexible DC power grid[J]. Global energy Internet,2018,1(4): 403-412.
[22] 徐政. 柔性直流输电系统[M].北京:机械工业出版社,2016:213-220.
[23] 和敬涵,黄威博,李海英,等. FBMMC直流故障穿越机理及故障清除策略[J].电力自动化设备, 2017, 37(10): 1-7.
He Jinghan, Huang Weibo, Li Haiying, et al.FBMMC DC fault crossing mechanism and fault clearing strategy[J]. Power Automation Equipment, 2017, 37(10): 1-7.
[24] 张建坡, 赵成勇, 黄晓明, 等. 基于模块化多电平高压直流输电系统接地故障特性仿真分析[J].电网技术, 2014, 38(10):2658-2664.
Zhang Jianpo, Zhao Chengyong, Huang Xiaoming, et al.simulation analysis on ground fault characteristics of modular multilevel HVDC transmission system[J]. Power Grid Technology, 2014, 38(10): 2658-2664.
[25] 王威儒,贺之渊,李国庆,等.含交流影响的MMC-HVDC直流故障电流递推计算方法[J].中国电机工程学报, 2019, 39(增刊1): 313-320.
Wang Weiru,He Zhiyuan,Li Guoqing,et al.Recursive calculation method of MMC-HVDC DC fault current with AC effect[J]. Proceedings of the CSEE, 2019, 39(S1): 313-320.
[26] Li Chengyu, Zhao Chengyong, et al.A pole-to-pole short-circuit fault current calculation method for DC grids[J]. IEEE Transactions on Power Systems, 2017,32(6):4943-4953.
[27] Gao Shilin, Ye Hua, et al.Accurate and efficient estimation of short-circuit current for MTDC grids considering MMC control[J]. IEEE Transactions on Power Delivery, 2019, 35(3): 541-1552.
[28] 刘麒麟,张英敏,张明奇,等.直流电网输电线路短路故障的单端化近似解析计算方法[J/OL].电测与仪表:1-7[2021-02-27].
Liu Qilin, Zhang Yingmin, Zhang Mingqi, et al.Single-ended approximate analytical calculation method for short circuit fault of DC power transmission lines[J/OL].Electrical Measurement and Instrumentation:1-7[2021-02-27].
[29] 汤兰西,董新洲. MMC直流输电网线路短路故障电流的近似计算方法[J]. 中国电机工程学报, 2019, 39(2): 490-498.
Tang Lanxi, Dong Xinzhou.An approximate method for the calculation of transmission line fault current in MMC-HVDC grid[J]. Proceedings of the CSEE, 2019, 39(2): 490-498.
[30] 郝亮亮, 李伟杰, 王卓雅, 等. MMC-HVDC电网输电线路双极短路故障电流的实用计算[J].电力系统自动化, 2020, 44(5): 68-76.
Hao Liangliang, Li Weijie,Wang Zhuoya, et al.Practical calculation for bipolar short-circuit fault current of transmission line in MMC-HVDC grid[J]. Automation of Electric Power Systems,2020, 44(5): 68-76
[31] Xu Jianzhong, Zhu Sicheng, Li Chengyu, et al.DC fault currentcalculation method in MMC-HVDC grid considering current-limiting devices[J]. The Journal of Engineering, 2019, 2019(16):3188-3195.
[32] 茆美琴,何壮,陆辉,等.含故障限流器投入的MMC-HVDC系统直流短路故障电流解析计算[J].电网技术,2022,46(1):81-89.
Mao Meiqin, He Zhuang, Lu Hui, et al.Analytical calculation of DC short-circuit fault current of mmc-hvdc system with fault current limiter input[J]. Power Grid Technology, 2022,46(1): 81-89.