Abstract：To analyze the influence of the interaction between vector control loop and the weak AC grid on system stability, the linearized transfer function models under different operating modes of VSC were built. By analyzing the distributions of zeros and poles in open-loop transfer function and closed loop transfer function, the instability analytical criterion was proposed. Meanwhile, the relationship of the power and current in the simplified system of VSC was studied, which revealed the instability mechanism of VSC-HVDC connected to the weak AC system and obtained the physical meaning of the instability criterion. Finally, VSC-HVDC connected to the weak AC system model was built in PSCAD/EMTDC and the theoretical research was verified by simulation.
邵冰冰, 赵书强, 高本锋, 宋斯珩, 李忍. 连接弱交流电网的VSC-HVDC失稳机理及判据研究[J]. 电工技术学报, 2019, 34(18): 3884-3896.
Shao Bingbing, Zhao Shuqiang, Gao Benfeng, Song Siheng, Li Ren. Instability Mechanism and Criterion Analysis of VSC-HVDC Connected to the Weak AC Power Grid. Transactions of China Electrotechnical Society, 2019, 34(18): 3884-3896.
[1] 陈宝平, 林涛, 陈汝斯, 等. 直驱风电场经VSC-HVDC并网系统的多频段振荡特性分析[J]. 电工技术学报, 2018, 33(增刊1): 176-184. Chen Baoping, Lin Tao, Chen Rusi, et al.Characteri- stics of multi-band oscillation for direct drive wind farm interfaced with VSC-HVDC system[J]. Transa- ctions of China Electrotechnical Society, 2018, 33(S1): 176-184. [2] 杨悦, 李国庆. 基于VSC-HVDC的海上风电小干扰稳定控制[J]. 电工技术学报, 2016, 31(13): 101-110. Yang Yue, Li Guoqing.The small signal stability control of offshore wind farm based on VSC- HVDC[J]. Transactions of China Electrotechnical Society, 2016, 31(13): 101-110. [3] 吴杰, 王志新. 多端柔性直流输电系统的改进下垂控制策略[J]. 电工技术学报, 2017, 32(20): 241-250. Wu Jie, Wang Zhixin.Improved droop control strategy for multi-terminal voltage source converter- HVDC[J]. Transactions of China Electrotechnical Society, 2017, 32(20): 241-250. [4] 邵冰冰, 韩民晓, 郭抒颖, 等. 多端柔性直流输电系统交流侧故障穿越功率协调控制[J]. 电力建设, 2017, 38(8): 109-117. Shao Bingbing, Han Minxiao, Guo Shuying, et al.Power coordinated control strategy for AC-side failure ride-through of VSC-MTDC system[J]. Electric Power Construction, 2017, 38(8): 109-117. [5] Zeng Rong, Xu Lie, Yao Liangzhong, et al.Design and operation of a hybrid modular multilevel converter[J]. IEEE Transactions on Power Elec- tronics, 2014, 30(3): 1137-1146. [6] Xu Jianzhong, Zhao Penghao, Zhao Chengyong.Reliability analysis and redundancy configuration of MMC with hybrid submodule topologies[J]. IEEE Transactions on Power Electronics, 2015, 31(4): 2720-2729. [7] 韩民晓, 翟冬玲, 唐晓骏. 连接低惯量系统的柔性直流输电模型预测控制[J]. 电工技术学报, 2017, 32(22): 198-206. Han Minxiao, Zhai Dongling, Tang Xiaojun.Model predictive control of voltage source converter-HVDC connected to low inertia system[J]. Transactions of China Electrotechnical Society, 2017, 32(22): 198-206. [8] 黄云辉, 宋泽凡, 唐金锐, 等. 连接弱电网的并网变换器直流电压时间尺度稳定器的设计与分析[J]. 电工技术学报, 2018, 33(增刊1): 185-192. Huang Yunhui, Song Zefan, Tang Jinrui, et al.Design and analysis of DC-link voltage stabilizer for voltage source converter as connected to weak grid[J]. Transactions of China Electrotechnical Society, 2018, 33(S1): 185-192. [9] 苑宾. 联接弱交流电网的柔性直流输电系统小信号稳定性研究[D]. 北京: 华北电力大学, 2017. [10] Harnefors L, Bongiorno M, Lundberg S.Input- admittance calculation and shaping for controlled voltage-source converters[J]. IEEE Transactions on Industrial Electronics, 2007, 54(6): 3323-3334. [11] Zhou J Z, Gole A M.VSC transmission limitations imposed by AC system strength and AC impedance characteristics[C]//10th IET International Conference on AC and DC Power Transmission, Birmingham, 2012: 1-6. [12] Zhou J Z, Ding Hui, Fan Shengtao, et al.Impact of short- circuit ratio and phase-locked-loop parameters on the small-signal behavior of a VSC-HVDC converter[J]. IEEE Transactions on Power Delivery, 2014, 29(5): 2287-2296. [13] Xu Ling, Fan Lingling.Impedance-based resonance analysis in a VSC-HVDC system[J]. IEEE Transa- ctions on Power Delivery, 2013, 28(4): 2209-2216. [14] Konishi H, Takahashi C, Kishibe H, et al.A consideration of stable operating power limits in VSC-HVDC systems[C]//Seventh International Con- ference on AC-DC Power Transmission, London, UK, 2001: 102-106. [15] Midtsund T, Suul J A, Undeland T.Evaluation of current controller performance and stability for voltage source converters connected to a weak grid[C]// IEEE International Symposium on Power Electronics for Distributed Generation Systems, Hefei, 2010: 382-388. [16] Magg T G, Manchen M, Krige E, et al.Caprivi link HVDC interconnector: comparison between energized system testing and real-time simulator testing[Z]. Cigre, 2012. [17] 王旭斌, 杜文娟, 王海风. 弱连接条件下并网VSC系统稳定性分析研究综述[J]. 中国电机工程学报, 2018, 38(6): 1593-1604. Wang Xubin, Du Wenjuan, Wang Haifeng.Stability analysis of grid-tied VSC systems under weak connection conditions[J]. Proceedings of the CSEE, 2018, 38(6): 1593-1604. [18] Huang Jin, Yuan Xiaoming.Impact of the voltage feed-forward and current decoupling on VSC current control stability in weak grid based on complex variables[C]//IEEE Energy Conversion Congress and Exposition, Montreal, QC, 2015: 6845-6852. [19] Zhao Mingquan, Yuan Xiaoming, Hu Jiabing, et al.Voltage dynamics of current control time-scale in a VSC-connected weak grid[J]. IEEE Transactions on Power Systems, 2016, 31(4): 2925-2937. [20] 熊凌飞, 韩民晓, 姚蜀军. 锁相环对多端柔性直流稳定性作用分析及参数选择研究[J]. 电工技术学报, 2015, 30(16): 203-212. Xiong Lingfei, Han Minxiao, Yao Shujun.Influence of PLL on the stability analysis of VSC-MTDC and parameter selection[J]. Transactions of China Elec- trotechnical Society, 2015, 30(16): 203-212. [21] Yazdani A, Iravani R.Voltage-sourced converters in power systems: modeling, control, and applications[Z]. New York, USA: Wiley, 2010. [22] 徐政. 交直流电力系统动态行为分析[M]. 北京: 机械工业出版社, 2004. [23] IEEEStd 1204—1997 IEEE guide for planning DC links terminating at AC locations having low short- circuit capacities[S]. 1997. [24] Wang Xiongfei, Harnefors L, Blaabjerg F.Unified impedance model of grid-connected voltage-source converters[J]. IEEE Transactions on Power Elec- tronics, 2018, 33(2): 1775-1787. [25] 电气工程电气设计手册第一册: 电气一次部分[M]. 北京: 中国电力出版社, 1989. [26] 杨洁, 刘开培, 余俞, 等. 交流电网互联的双端柔性直流输电系统小信号建模[J]. 中国电机工程学报, 2015, 35(9): 2177-2184. Yang Jie, Liu Kaipei, Yu Yu, et al.Small signal modeling for VSC-HVDC used in AC grid inter- connection[J]. Proceedings of the CSEE, 2015, 35(9): 2177-2184. [27] 胡寿松. 自动控制原理[M]. 北京: 科学出版社, 2013. [28] (美) Katsuhiko Ogata. 现代控制工程[M]. 卢伯英, 等译. 5版. 北京: 电子工程出版社, 2015.
2019, Vol. 34 
