Abstract：Recently APF (active power filter) has been widely used for the reduction of the harmonics and improvement of the power quality in power systems. However, a PWM-based APF generates harmonics at the switching frequency and its multiples, and may produce EMC (electromagnetic compatibility) problems. Randomization of the switching frequency causes the harmonic components with high magnitude on switching frequency extend as low magnitude harmonic components with a bandwidth. The magnitude of harmonic components can be reduced. In the paper, the randomized PWM technique is used to overcome the harmonics problems of the APF caused by the high frequency harmonics. Detailed analyses and the PSD characteristics of the RPWM for suppressing switching frequency harmonics of the APF are presented. A practical design procedure of the randomized PWM technique is proposed. Simulation and experimental results confirm the validity of such technique.
李辉, 吴正国. 采用随机脉宽调制技术降低电力有源滤波器开关谐波[J]. 电工技术学报, 2010, 25(8): 105-109.
Li Hui, Wu Zhengguo. Reduction of Switching Frequency Harmonics of Active Power Filter Using Randomize PWM Technique. Transactions of China Electrotechnical Society, 2010, 25(8): 105-109.
[1] Holmes D G. A general analytical method for determining the theoretical harmonic components of carrier based PWM strategies[C]. IEEE Industry Applications Society Annual Meeting, 1998: 1207-1214. [2] 范瑞祥, 罗安, 章兢, 等. 谐振注入式有源滤波器的输出滤波器研究[J]. 中国电机工程学报, 2006, 26(5): 95-100. [3] 史伟伟, 蒋全, 胡敏强, 等. 串联型电力有源滤波器中低通滤波器的设计及参数优化[J]. 中国电机工程学报, 2001, 21(11): 44-47. [4] Dixon J, Tepper S, Moran L. Practical evaluation of different modulation techniques for current-controlled voltage source inverters[C]. IEE Proceedings on Electric Power Applications, 1996: 301-306. [5] Simone B, Malesani L, Mattavelli P. Comparison of current control techniques for active filter appli- cations[J]. IEEE Transactions on Industrial Electronics, 1998, 45(5): 722-729. [6] 刘飞, 邹云屏, 李辉. 基于重复控制的电压源型逆变器输出电流波形控制方法[J]. 中国电机工程学报, 2005, 25(l9): 48-63. [7] Lai Y S, Huang H, Kuan Y. A new random inverter control technique for motor drives[C]. Proceedings. of the 13th IEEE Applied Power Electronics Conference and Exposition, 1998: 101-107. [8] Liaw C M, Lin Y M, Wu C H, et al. Analysis, design and implementation of a random frequency PWM inverter[J]. IEEE Transactions on Power Electronics, 2000, 15(5): 843-854. [9] Kirlin R L, Bech M M, Trzynadolwski A M. Analysis of power and power spectral density in PWM inverters with randomized switching frequency[J]. IEEE Transactions on Industry Electronics, 2002, 49(2): 486-499. [10] 李志忠, 丘水生, 陈艳峰. 混沌调制对开关变换器EMI抑制有效性的实验研究[J]. 电工技术学报, 2006, 21(8): 97-102. [11] 幸善成, 吴正国. 基于多电平随机脉宽调制技术的共模电压和谐波抑制方法[J]. 中国电机工程学报, 2006, 26(17): 57-61.
2010, Vol. 25 
