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| Circulating Current Suppressing Method Based on Active Damping Control of MMC Considering Low-Frequency Oscillation |
| Xu Qianming1, Luo An1, Ma Fujun1, Xiong Qiaopo1, Wang Lingzhi2 |
| 1. National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China; 2. State Grid Hunan Electric Power Company Changsha 410000 China |
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Abstract In order to analyze and suppress the low-frequency circulating currents of modular multilevel converter (MMC), a transient mathematical model for the sum of capacitor voltages and the circulating current of arm is established. The model reveals the principle of low-frequency oscillation under abnormal conditions. And then, the analytical expressions of oscillation frequency and the resonance point of 2nd circulating current without circulating current control are derived. In order to inhibit both low-frequency oscillation and 2nd circulating current, a circulating current suppressing method (CCSM) based on active damping control is proposed, which is simple without decoupling and coordinate transformation. Finally, the simulation and experimental results show that this method can suppress the low-frequency oscillation in transient state as well as 2nd and 2nd above circulating currents in steady state simultaneously.
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Received: 05 March 2014
Published: 30 December 2015
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[1] 汤广福. 基于电压源换流器的高压直流输电技术[M]. 北京: 中国电力出版社, 2009.
[2] Akagi H. Classification, terminology, and application of the modular multilevel cascade converter (MMCC)[J]. IEEE Transactions on Power Electronics, 2011, 26(11): 3119-3130.
[3] 邓旭, 王东举, 沈扬, 等. 舟山多端柔性直流输电工程换流站内部暂态过电压[J]. 电力系统保护与控制, 2013, 41(18): 111-119.
Deng Xu, Wang Dongju, Shen Yang, et al. Research on transient overvoltage for converter station of Zhoushan multi-terminal VSC-HVDC project[J]. Power System Protection and Control, 2013, 41(18): 111-119.
[4] 杨晓峰, 范文宝, 王晓鹏, 等. 基于模块组合多电平变换器的STATCOM及其控制[J]. 电工技术学报, 2011, 26(8): 7-13.
Yang Xiaofeng, Fan Wenbao, Wang Xiaopeng, et al. Study on modular multilevel converter based STATCOM and its control[J]. Transactions of China Electro- technical Society, 2011, 26(8): 7-13.
[5] 翟晓萌, 赵成勇, 李路遥, 等. 模块化多电平动态电压恢复器的研究[J]. 电力系统保护与控制, 2013, 41(12): 86-91.
Zhai Xiaomeng, Zhao Chengyong, Li Luyao, et al. Study of modular multilevel dynamic voltage restorer[J]. Power System Protection and Control, 2013, 41(12): 86-91.
[6] Baruschka L, Mertens A. A new 3-phase AC/AC modular multilevel converter with six branches in hexagonal configuration[C]. IEEE Energy Conversion Congress and Exposition (ECCE), Phoenix, 2011: 4005-4012.
[7] 王奎, 郑泽东, 李永东, 等. 新型模块化多电平变换器电容电压波动规律及抑制方法[J]. 电工技术学报, 2011, 26(5): 8-14.
Wang Kui, Zheng Zedong, Li Yongdong, et al. Voltage ripple principle and restrain method of floating capacitors in a new modular multilevel converter[J]. Transactions of China Electrotechnical Society, 2011, 26(5): 8-14.
[8] 杨晓峰, 王晓鹏, 范文宝, 等. 模块组合多电平变换器的环流模型[J]. 电工技术学报, 2011, 26(5): 21-27.
Yang Xiaofeng, Wang Xiaopeng, Fan Wenbao, et al. Circulating current model of modular multilevel converters[J]. Transactions of China Electrotechnical Society, 2011, 26(5): 21-27.
[9] 屠卿瑞, 徐政, 郑翔, 等. 模块化多电平换流器型直流输电内部环流机理分析[J]. 高电压技术, 2010, 36(2): 547-552.
Tu Qingrui, Xu Zheng, Zheng Xiang, et al. Mechanism analysis on the circulating current in modular multilevel converter based HVDC[J]. High Voltage Engineering, 2010, 36(2): 547-552.
[10] Ilves K, Norrga S, Harnefors L, et a1. Analysis of arm current harmonics in modular multilevel conver- ters with main-circuit filters[C]. 9th International Multi-Conference on Systems, Signals and Devices (SSD), Chemnitz, 2012: 1-6.
[11] Lennart H, Norrga S, Antonopoulos A, et a1. Dynamic modeling of modular multilevel converters[C]. 14th European Conference on Power Electronic and Applications (EPE), 2011: 1-10.
[12] Ilves K, Antonopoulos A, Norrga S, et a1. Steady- state analysis of interaction between harmonic com- ponents of arm and line quantities of modular multi- level converters[J]. IEEE Transactions on Industrial Electronics, 2012, 27(1): 57-68.
[13] 卓谷颖, 江道灼, 连霄壤. 模块化多电平换流器不平衡环流抑制研究[J]. 电力系统保护与控制, 2012, 40(24) : 118-124.
Zhuo Guying, Jiang Daozhuo, Lian Xiaorang. Study of unbalanced circular current suppressing for modular multilevel converter[J]. Power System Protection and Control, 2012, 40(24): 118-124.
[14] Tu Qingrui, Xu Zheng, Zhang Jing. Circulating current suppressing controller in modular multilevel converter[C]. 36th Annual Conference on IEEE Industrial Electronics Society (IECON), 2010: 3198- 3202.
[15] 杨晓峰, 郑琼林. 基于MMC环流模型的通用环流抑制策略[J]. 中国电机工程学报, 2012, 32(18): 59-65.
Yang Xiaofeng, Zheng Qionglin. A novel universal circulating current suppressing strategy based on the MMC circulating current model[J]. Proceedings of the CSEE, 2012, 32(18): 59-65.
[16] Li Zixin, Wang Ping, Chu Zunfang, et a1. An inner current suppressing method for modular multilevel converters[J]. IEEE Transactions on Industrial Electr- onics, 2013, 28(11): 4873-4879.
[17] Brandon J, Pierquet, David J, et al. A single- phase photovoltaic inverter topology with a series- connected energy buffer[J]. IEEE Transactions on Industrial Electronics, 2013, 28(10): 4603-4611.
[18] 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.
[19] 徐政. 柔性直流输电系统[M]. 北京: 机械工业出版社, 2012.
[20] Zhou Yuebin, Jiang Daozhuo, Guo Jie, et al. Analysis and control of modular multilevel converters under unbalanced conditions[J]. IEEE Transactions on Industrial Electronics, 2013, 28(4): 1986-1995.
[21] 张兴, 张崇巍. PWM整流器及其控制[M]. 北京: 机械工业出版社, 2012. |
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2015, Vol. 30 
