Abstract：A novel active damping control strategy for PWM converter with LCL filter is proposed in this paper. There is resonant peak in LCL filter frequency response. Conventional method is connecting a resistor in series with the filter capacitor to resolve the resonant peak, but the power loss will be brought by this passive damping method. The resonant peak could be damped by proper control strategy which is called active damping. A novel design method of filter capacitor current feedback loop is introduced. The filter capacitor current estimate method is adopted so there is no addition sensors needed. The resonant peak is attenuated and the waveform of output current is improved. Finally, the feasibility of the proposed method is verified through experimental results.
张学广, 刘义成, 王瑞, 徐殿国. 一种新型的PWM变换器LCL滤波器有源阻尼控制策略[J]. 电工技术学报, 2011, 26(10): 188-192.
Zhang Xueguang, Liu Yicheng, Wang Rui, Xu Dianguo. A Novel Active Damping Control Strategy for PWM Converter with LCL Filter. Transactions of China Electrotechnical Society, 2011, 26(10): 188-192.
[1] Mariusz Malinowski, Marek Jasin’ski, Marian P, et al. Simple direct power control of three phase PWM rectifier using space-vector modulation [J]. IEEE Transactions on Power Electronics, 2004, 51(2): 447-454. [2] Leonardo Augusto Serpa, Srinivas Ponnaluri, Peter Mantovanelli Barbosa, et al. A modified direct power control strategy allowing the connection of three-phase inverters to the grid through LCL filters [J]. IEEE Transactions on Industry Application, 2007, 43 (5): 1388-1400. [3] Liserre M, Teodorescu R, Blaabjerg F. Stability of photovoltaic and wind turbine grid-connected inverters for a large set of grid impedance values[J]. IEEE Transactions on Power Electronics, 2006, 21(1): 263-272. [4] 陈瑶, 金新民, 童亦斌. 三相电压型PWM整流器网侧LCL滤波器[J]. 电工技术学报, 2007, 22(9)：124-129. [5] 沈国桥, 徐德鸿. LCL滤波并网逆变器的分裂电容法电流控制[J]. 中国电机工程学报, 2008, 28(18)：36-41. [6] 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. [7] Twining E. Holmes D. Grid current regulation of a three phase voltage source inverter with an LCL input filter[J].IEEE Transactions Power Electronics, 2003, 18(3): 888-895. [8] Liserre M, Dell A Aquila, Blaabjerg F. Stability improvements of an LCL-filter based three-phase active rectifier[C]. Proceedings of the IEEE Power Electronics Specialist Conference, 2002: 1195-1201. [9] Dahono P, Bahar Y, Sato Y, et al. Damping of transient oscillations on the output LC filter of PWM inverters by using a virtual resistor[C]. Proceedings of the 4th IEEE International Conference Power Electronics Drive Systems, 2001, 1: 403-407. [10] 张宪平, 林资旭, 李亚西, 等. LCL 滤波的 PWM 整流器新型控制策略[J]. 电工技术学报, 2007, 22(2): 74-77.
2011, Vol. 26 
