Abstract：The parameters of output filter in distribution network STATCOM (D-STATCOM) greatly affect the attenuation of switching harmonics and the performance of the system. This paper analyses the characteristics of LCL filter from the aspects of the fundamental inductor voltage drop, the reactive power compensation ability of STATCOM, the attenuation of switching harmonics, and filter resonant frequency. Then a parameter design method of LCL filter is proposed based on these constraints. In addition, the power loss of the filter is greatly reduced by connecting a small inductor in parallel with the damping resistor in this paper. The simulation results show that the designed LCL filter parameters have good filtering effects, and the filter has larger pass-band width, making D-STATCOM to have the function to compensate some harmonics.
[1] 罗承廉, 纪勇, 刘遵义. 静止同步补偿器(STATCOM) 的原理与实现[M]. 北京: 中国电力出版社, 2005. [2] 荣飞, 罗安, 范卿. 应用于不平衡系统的STATCOM电压控制新方法[J]. 电工技术学报, 2010, 25(3): 138-143. Rong Fei, Luo An, Fan Qing. A novel voltage control method applied in STATCOM under unbalanced system[J]. Transactions of China Electrotechnical Society, 2010, 25(3): 138-143. [3] Weineng Chang, Jinghuan Liau. Development of a cascaded multilevel DSTATCOM for real-time load power factor correction[C]. Proceedings of the IEEE International Power Engineering Conference 2010, Sapporo, 2010: 2037-2042. [4] Singh B, Adya A, Mittal A P, et al. Modeling, design and analysis of different controllers for D- STATCOM[C]. Proceedings of the IEEE International Conference on physics Science and Technology 2008, New Delhi, 2008: 1-8. [5] Mitra P, Venayagamoorthy G K. An adaptive control strategy for D-STATCOM applications in an electric ship power system[J]. IEEE Power Electronics, 2010, 25(1): 95-104. [6] 王兆安, 杨君, 刘进军, 等. 谐波抑制和无功功率补偿[M]. 2版. 北京: 机械工业出版社, 2005. [7] 孙蔚, 伍小杰, 戴鹏, 等. 基于LCL滤波器的电压源型PWM整流器控制策略综述[J]. 电工技术学报, 2008, 23(1): 90-96. Sun Wei, Wu Xiaojie, Dai Peng, et al. An overview of current control strategy for three-phase voltage- source rectifier with LCL filter[J]. Transactions of China Electrotechnical Society, 2008, 23(1): 90-96. [8] 荣飞, 罗安, 汤赐, 等. STATCOM输出滤波器结构设计及参数优化[J]. 电工技术学报, 2008, 23(4): 137-142. Rong Fei, Luo An, Tang Ci, et al. Structure design of output filter in STATCOM and its parameter optimization[J]. Transactions of China Electro-technical Society, 2008, 23(4): 137-142. [9] 武键, 徐殿国, 何娜. 并联有源滤波器输出LCL滤波器研究[J]. 电力自动化设备, 2007, 27(1): 17-20. Wu Jian, Xu Dianguo, He Na. Research on LCL filter applied to shunt active power filter[J]. Electric Power Automation Equipment, 2007, 27(1): 17-20. [10] Wang Cunping, Yin Xianggen, Wen Minghao, et al. Structure and parameters design of output LC filter in D-STATCOM[C]. Proceedings of the IEEE Powercon 2010, Hangzhou, China, 2010: 1-6. [11] Wang T CY, Ye Zhihong, Sinha G, et al. Output filter design for a grid-interconnected three-phase inverter[C]. Proceedings of the IEEE Power Electronics Specialists Conference 2003, Acapulco, Mexico, 2003: 779-784.
2011, Vol. 26 
