Abstract Fault current characteristics of high voltage direct current transmission based modular multilevel converter (MMC-HVDC) station based on power electronic devices are very different with that of conventional synchronous source, which results in the adaptability problem of traditional phase selection method. The fault current characteristics of converter station side of ac transmission line is analyzed under wye configuration and delta configuration for converter transformer valve side, and then the analytical expression of fault current is obtained. The effects of voltage sag depth, voltage unbalance degree, different control targets on the performance of two traditional phase selection method, i.e, the phase selection method based on the sudden-change of two-phase current difference and the phase selection method based on current sequence components, are derived and studied deeply. The relationship of voltage sequence components between relay location and fault location is analyzed. Hereby a novel phase selection method based on voltage sequence components of relay place is presented, which can adapt to MMC-HVDC station. A simulation platform is set up and then the adaptability of traditional phase selection method and the effectiveness of the proposed novel phase selection method are tested.
Liang Yingyu,Xu Guanjun,Li Wulin等. Influence of the Integration of MMC-HVDC Station on Traditional Phase Selection Method and the Countermeasure[J]. Transactions of China Electrotechnical Society, 2020, 35(1): 201-212.
[1] Yang Qichen, Qin Jiangchao, Saeedifard M.A post-fault strategy to control the modular multilevel converter under submodule failure[J]. IEEE Transactions on Power Delivery, 2016, 31(6): 2453-2463. [2] 王洁聪, 刘崇茹, 徐东旭, 等. 基于RTDS的模块化多电平换流器闭锁状态仿真建模方法[J]. 电工技术学报, 2018, 33(16): 3686-3696. Wang Jiecong, Liu Congru, Xu Dongxu, et al.Simulation method of modular multilevel converter blocking state based on RTDS[J]. Transactions of China Electrotechnical Society, 2018, 33(16): 3686-3696. [3] 郝亮亮, 张静, 顾亚旗, 等. 基于桥臂能量预测的模块化多电平换流器子模块故障优化容错控制策略[J]. 电工技术学报, 2018, 33(16): 3697-3706. Hao Liangliang, Zhang Jing, Gu Yaqi, et al.Sub-module fault tolerant optimal control strategy of modular multilevel converter based on estimation of bridge energy[J]. Transactions of China Electrotechnical Society, 2018, 33(16): 3697-3706. [4] 邹常跃, 陈俊, 许树楷, 等. 长控制链路延时特征下柔性直流输电系统动态性能改善方法[J]. 电网技术, 2017, 41(10): 3216-3222. Zou Changyue, Chen Jun, Xu Shukai, et al.Dynamic performance optimization of VSC-HVDC considering its long delay[J]. Power System Technology, 2017, 41(10): 3216-3222. [5] 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 characteristics of DC fault in bipolar MMC-HVDC system[J]. Transactions of China Electrotechnical Society, 2017, 32(10): 53-60. [6] 王晨清, 宋国兵, 汤海雁, 等. 选相及方向元件在风电接入系统中的适应性分析[J]. 电力系统自动化, 2016, 40(1): 89-95. Wang Chenqing, Song Guobing, Tang Haiyan, et al.Adaptability analysis of phase selectors and directional relays in power systems integrated with wind farms[J]. Automation of Electric Power System, 2016, 40(1): 89-95. [7] Zhou Yuebin, Jiang Daozhuo, Guo Jie, et al.Analysis and control of modular multilevel converters under unbalanced conditions[J]. IEEE Transactions on Power Delivery, 2013, 28(4): 1986-1995. [8] 刘子文, 苗世洪, 范志华, 等. 不平衡电网电压下柔性直流输电系统功率滑模补偿策略[J]. 电工技术学报, 2018, 33(14): 3296-3305. Liu Ziwen, Miao Shihong, Fan Zhihua, et al.Power sliding mode compensation strategy of VSC-HVDC under unbalanced grid voltage[J]. Transactions of China Electrotechnical Society, 2018, 33(14): 3296-3305. [9] Shi Xiaojie, Wang Zhiqiang, Liu Bo, et al.Characteristic investigation and control of a modular multilevel converter-based HVDC system under single-line-to-ground fault conditions[J]. IEEE Transactions on Power Electronics, 2015, 30(1): 408-421. [10] Zeng Rong, Xu Lie, Yao Liangzhong, et al.Analysis and control of modular multilevel converters under asymmetric arm impedance conditions[J]. IEEE Transactions on Industrial Electronics, 2016, 63(1): 71-81. [11] Liang Yingyu, Liu Jianzheng, Zhang Tao, et al.Arm current control strategy for MMC-HVDC under unbalanced conditions[J]. IEEE Transactions on Power Delivery, 2017, 32(1): 125-134. [12] 苑宾, 许建中, 赵成勇, 等. 利用虚拟电阻提高接入弱交流电网的MMC小信号稳定性控制方法[J]. 中国电机工程学报, 2015, 35(15): 3794-3802. Yuan Bin, Xu Jianzhong, Zhao Chengyong, et al.A virtual resistor based control strategy for enhancing the small-signal stability of MMC integrated in weak AC system[J]. Proceeding of the CSEE, 2015, 35(15): 3794-3802. [13] 刘炜, 郭春义, 赵成勇, 等. 一种适用于 MMC-HVDC连接极弱受端交流电网的功率阻尼同步控制方法[J]. 中国电机工程学报, 2016, 36(17): 4647-4655. Liu Wei, Guo Chunyi, Zhao Chengyong, et al.Power damping synchronization control for MMC-HVDC connected to an extremely weak receiving AC grid[J]. Proceeding of the CSEE, 2016, 36(17): 4647-4655. [14] 丁久东, 田杰, 刘奎, 等. 柔性直流输电对交流系统负序方向元件影响分析[J]. 电力系统自动化, 2017, 41(12): 113-117. Ding Jiudong, Tian Jie, Liu Kui, et al.Impact of VSC-HVDC on negative sequence directional component in alternating current system[J]. Automation of Electric Power System, 2017, 41(12): 113-117. [15] 陈实, 邰能灵, 范春菊, 等. 逆变型电源接入对选相元件的影响分析[J]. 电力系统自动化, 2017, 41(12): 106-112, 187. Chen Shi, Tai Nengling, Fan Chunju, et al.Influence of inverter-interfaced generator on element of phase selectors[J]. Automation of Electric Power System, 2017, 41(12): 106-112, 187. [16] 张保会, 王进, 原博, 等. 风电接入对继电保护的影响(四)——风电场送出线路保护性能分析[J]. 电力自动化设备, 2013, 33(4): 1-5. Zhang Baohui, Wang Jin, Yuan Bo, et al.Impact of wind farm integration on relay protection(4): performance analysis for wind farm outgoing transmission line protection[J]. Electric Power Automation Equipment, 2013, 33(4): 1-5. [17] 申洪明. 直流换相失败对交流侧保护的影响分析与对策研究[D]. 北京: 华北电力大学, 2016. [18] 吴方劼, 马玉龙, 梅念, 等. 舟山多端柔性直流输电工程主接线方案设计[J]. 电网技术, 2014, 38(10): 2651-2657. Wu Fangjie, Ma Yulong, Mei Nian, et al.Design of main connection scheme for Zhoushan flexible multi-terminal HVDC transmission project[J]. Power System Technology, 2014, 38(10): 2651-2657. [19] 赵新. 电励磁直驱风力发电机并网控制技术研究[D]. 北京: 北京交通大学, 2014. [20] 黄涛, 陆于平, 凌启程, 等. 适应于双馈风电场的改进故障序分量选相方法[J]. 电力自动化设备, 2016, 36(4): 123-128. Huang Tao, Lu Yuping, Ling Qicheng, et al.Improved fault-sequence component phase selector applied to DFIG-based wind farm[J]. Electric Power Automation Equipment, 2016, 36(4): 123-128.
2020, Vol. 35 
