Abstract：DC fault is one of the main fault types in modular multilevel converter based HVDC (MMC-HVDC). The current research has mainly focused on pseudo bipolar system, while the research of DC fault in bipolar system is still in the initial stage. Hence, this paper introduces the topology and working principle of MMC in bipolar system. For the bipolar and pseudo bipolar systems, the corresponding equivalent circuits of MMC-HVDC system during DC fault are built respectively according to electrical parameters of AC/DC system, the discharging mechanism of sub-module capacitance and inductor on bridge arms. The effects of fault current on bridge arm valve group in bipolar and pseudo bipolar systems are compared, and the relationship between three electrical parameters and fault current is described. Finally, a 51-level bipolar MMC-HVDC model is set up in RT-LAB. The simulation results validate the method of DC fault characteristics.
陈继开, 孙川, 李国庆, 李扬, 李江. 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, Li Yang, Li Jiang. Study on Characteristics of DC Fault in Bipolar MMC-HVDC System. Transactions of China Electrotechnical Society, 2017, 32(10): 53-60.
[1] 姚良忠, 吴婧, 王志冰, 等. 未来高压直流电网发展形态分析[J]. 中国电机工程学报, 2014, 34(34): 6007-6020. Yao Liangzhong, Wu Jing, Wang Zhibing, et al. Pattern analysis of future HVDC grid development[J]. Proceedings of the CSEE, 2014, 34(34): 6007-6020. [2] 周孝信, 陈树勇, 鲁宗相. 电网和电网技术发展的回顾与展望: 试论三代电网[J]. 中国电机工程学报, 2013, 33(22): 1-11. Zhou Xiaoxin, Chen Shuyong, Lu Zongxiang. Review and prospect for power system development and related technologies: a concept of three-generation power systems[J]. Proceedings of the CSEE, 2013, 33(22): 1-11. [3] 温家良, 吴锐, 彭畅, 等. 直流电网在中国的应用前景分析[J]. 中国电机工程学报, 2012, 32(13): 7-12. Wen Jialiang, Wu Rui, Peng Chang, et al. Analysis of DC grid prospects in China[J]. Proceedings of the CSEE, 2012, 32(13): 7-12. [4] 汤广福, 贺之渊, 腾乐天, 等. 电压源换流器高压直流输电技术最新研究进展[J]. 电网技术, 2008, 32(22): 39-44. Tang Guangfu, He Zhiyuan, Teng Letian. New progress on HVDC technology based on voltage source converter[J]. Power System Technology, 2008, 32(22): 39-44. [5] Flourentzou N, Agelidis V G, Demetriades G D. VSC-based HVDC power transmission systems: an overview[J]. IEEE Transactions on Power Electronics, 2009, 24(3): 592-602. [6] 彭浩, 邓焰, 王莹, 等. 模块化多电平变换器模型及稳态特性研究[J]. 电工技术学报, 2015, 30(12): 120-127. Peng Hao, Deng Yan, Wang Ying, et al. Research about the model and steady-state performance for modular multilevel converter[J]. Transactions of China Electrotechnical Society, 2015, 30(12): 120- 127. [7] 楚遵方, 李耀华, 王平, 等. 柔性直流输电系统中模块化多电平变流器的直流侧充电策略分析[J]. 电工技术学报, 2015, 30(12): 136-142. Chu Zunfang, Li Yaohua, Wang Ping, et al. Analysis of charging strategy by DC grid of modular multi- level converter in high voltage direct current transmission system[J]. Transactions of China Electro- technical Society, 2015, 30(12): 136-142. [8] 敬华兵, 年晓红, 龚芬. MMC子模块元件短路故障机理及其新型保护策略[J]. 电工技术学报, 2015, 30(3): 21-27. Jing Huabing, Nian Xiaohong, Gong Fen. Fault mechanism and novel protection strategy of MMC sub-module component short-circuit[J]. Transactions of China Electrotechnical Society, 2015, 30(3): 21-27. [9] 张哲任, 徐政, 薛英林. MMC-HVDC系统过电压保护和绝缘配合的研究[J]. 电力系统保护与控制, 2013, 41(21): 58-64. Zhang Zheren, Xu Zheng, Xue Yinglin. Study of overvoltage protection and insulation coordination for MMC based HVDC[J]. Power System Protection and Control, 2013, 41(21): 58-64. [10] 蒋冠前, 李志勇, 杨慧霞, 等. 柔性直流输电系统拓扑结构研究综述[J]. 电力系统保护与控制, 2015, 43(15): 145-153. Jiang Guanqian, Li Zhiyong, Yang Huixia, et al. Research review on topological structure of flexible HVDC system[J]. Power System Protection and Control, 2015, 43(15): 145-153. [11] 薛英林, 徐政. 基于钳位双子模块的MMC-HVDC起动控制策略[J]. 电力系统保护与控制, 2013, 41(11): 1-4. Xue Yinglin, Xu Zheng. Start control for the MMC- HVDC system based on clamp double submodule[J]. Power System Protection and Control, 2013, 41(11): 1-4. [12] 张建坡, 赵成勇. MMC-HVDC直流侧故障特性仿真分析[J]. 电力自动化设备, 2014, 34(7): 32-37. Zhang Jianpo, Zhao Chengyong. Simulation and analysis of DC fault characteristics for MMC- HVDC[J]. Automation of Electric Power Systems, 2014, 34(7): 32-37. [13] 赵成勇, 李探, 俞露杰, 等. MMC-HVDC直流单极接地故障分析与换流站故障恢复策略[J]. 中国电机工程学报, 2014, 34(21): 3518-3526. Zhao Chengyong, Li Tan, Yu Lujie, et al. DC pole- to-ground fault characteristic analysis and converter fault recovery strategy of MMC-HVDC[J]. Pro- ceedings of the CSEE, 2014, 34(21): 3518-3526. [14] 赵成勇, 陈晓芳, 曹春刚, 等. 模块化多电平换流器HVDC直流侧故障控制保护策略[J]. 电力系统自动化, 2011, 35(23): 82-87. Zhao Chengyong, Chen Xiaofang, Cao Chungang, et al. Control and protection strategies for MMC-HVDC under DC faults[J]. Automation of Electric Power Systems, 2011, 35(23): 82-87. [15] 王姗姗, 周孝信, 汤广福, 等. 模块化多电平换流器HVDC直流双极短路子模块过电流分析[J]. 中国电机工程学报, 2011, 31(1): 1-7. Wang Shanshan, Zhou Xiaoxin, Tang Guangfu, et al. Analysis of submodule overcurrent caused by DC pole-to-pole fault in modular multilevel converter HVDC system[J]. Proceedings of the CSEE, 2011, 31(1): 1-7. [16] 孔明, 唐广福, 贺之渊. 子模块混合型MMC- HVDC直流故障穿越控制策略[J]. 中国电机工程学报, 2014, 34(30): 5343-5351. Kong Ming, Tang Guangfu, He Zhiyuan. A DC fault ride-through strategy for cell-hybrid modular multi- level converter based HVDC transmission systems[J]. Proceedings of the CSEE, 2014, 34(30): 5343-5351. [17] 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 research on earth fault characteristics of modular multilevel converter based high voltage direct current transmission system[J]. Power System Technology, 2014, 38(10): 2658-2664. [18] 行登江, 吴金龙, 王先为, 等. MMC-HVDC系统直流断线故障特性分析[J]. 电网技术, 2015, 39(7): 1825-1832. Xing Dengjiang, Wu Jinlong, Wang Xianwei, et al. Analysis on characteristic of DC transmission line breakage fault in modular multilevel converter based HVDC transmission system[J]. Power System Tech- nology, 2015, 39(7): 1825-1832. [19] Wang Haitian, Tang Guangfu, He Zhiyuan, et al. Efficient grounding for modular multilevel HVDC converters (MMC) on the AC side[J]. IEEE Transa- ctions on Power Delivery, 2014, 29(3): 1262-1272.
2017, Vol. 32 
