Abstract：The active power filter (APF) utilizing the pulse width modulation (PWM) technology generates high frequency switch harmonic current, which is leaked into the power grid and must be eliminated by output filter. Because of the excellent filtering performance of LCL while grid impedance fluctuating, the LCL filter is adopted as output filter in APF. Thus, the mathematical model of LCL type output filter in APF is constructed. For consuming problem caused by damping resistance, a LCL filter active damping method based on introducing capacitor current feedback is presented, which can enhance the damping equivalently and avoid current resonance. Simulation and experimental results justify the active damping method. On the basis of above research, synthetically considering the compensation performance of APF and filtering performance of LCL output filter etc, the optimization model of LCL filter and optimization method based on genetic algorithm are presented. Optimized LCL filter can not only eliminate switch harmonic effectively but also enhance the compensation ability of the APF.
[1] Akagi H. New trends in active filters for power conditioning[J]. IEEE Transactions on Industry Applications, 1996, 32(6): 1312-1322. [2] Peng Fangzheng. Application issues of active power filters[J]. IEEE Industry Applications Magazine, 1998(5): 21-30. [3] Habrouk M E I, Darwish M K, Mehta P. Active power filter: a review[J]. IEE Proc. Electr. Power. Appl., 2000, 147(5): 403-413. [4] 王群, 姚为正, 刘进军, 等. 谐波源与有源滤波器的补偿特性[J]. 中国电机工程学报, 2001, 21(2): 16-20. [5] Peng Fangzheng. Harmonic sources and filtering approaches[J]. IEEE Transactions on Industry Applications, 2001(4): 18-25. [6] 陈国柱, 吕征宇, 钱照明. 有源滤波器的一般原理及应用[J]. 中国电机工程学报, 2000, 20(9): 17-21. [7] 李战鹰, 任震, 杨泽明. 有源滤波装置及其应用综述[J]. 电网技术, 2004, 28(12): 40-43. [8] 肖湘宁, 徐永海, 刘昊. 混合型有源电力补偿技术与实验研究[J]. 电力系统自动化, 2002, 26(5): 39-44. [9] 杨茂, 苏文龙. 电力有源滤波器(APF)技术的探讨[J]. 四川电力技术, 2006, 29(6): 27-29. [10] 武健, 何娜, 徐殿国. 三相并联有源滤波器输出滤波器设计方法研究[J]. 电力电子技术, 2004, 38(6): 16-19. [11] 武健, 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. [12] Timothy C Y Wang, Ye Zhihong, Gautam Sinha, et al. Output filter design for a grid-interconnected three-phase inverter[C]. IEEE PESC 2003, Acapulco, Mexico, 2003:779-784. [13] Lindgren M, Svensson J. Control of a voltage-source converter connected to the grid through an LCL- filter-application to active filtering[C]. IEEE PESC 1998, Fukuoka (Japan), 1998: 229-235. [14] Liserre M, Blaabjerg F, Hansen S. Design and control of an LCL filter based active rectifier[J]. IEEE Transactions on Industry Applications, 2001, 38(2): 299-307. [15] 唐敏, 李群湛. 电力滤波器中逆变器输出滤波器的设计[J]. 电气时代, 2004(3): 120-122.
2011, Vol. 26 
