有源电力滤波器选择性谐波电流控制策略  

Selective Harmonic Current Control Strategy in Active Power Filters

作　　者：刘威葳[1] 丁洪发[1] 段献忠[1] 

机构地区：[1]国家脉冲强磁场科学中心(华中科技大学)(筹),湖北省武汉市430074

出　　处：《中国电机工程学报》2011年第27期14-20,共7页Proceedings of the CSEE

基　　金："十一五"国家科技支撑计划重大项目(2007BAA12B03)~~

摘　　要：良好的控制策略是实现并联型有源电力滤波器(active power filter,APF)补偿功能的关键。由于并联型APF常规电流PI控制方法的闭环增益受系统稳定性条件约束,并联型APF对负载主要谐波分量补偿不充分。针对该问题,提出一种用于APF的新型选择性谐波电流控制策略。该控制策略在常规电流PI控制策略的基础上,对负载电流主要谐波(该文主要指5次、7次谐波)单独提取与控制,而对其余次谐波采用一个常规电流PI控制器控制。该设计方法,增大了系统对主要谐波分量的跟踪增益,提高了APF对谐波的补偿率,实现了控制系统更好的频率响应。将该方法应用于实验室制作的一台30 kVA并联型APF实验装置,可将电流总谐波畸变率(total harmonic distortion,THD)由23.21%补偿为3.75%。仿真与实验结果证明了以上结论。In this paper, one conventional proportional integral （PI） control and one new current control, for shunt active power filters design, were compared. Because of the system stability constrained, the system loop gain of the PI control is restricted. Hence, in order to improve the system compensation performance, a new current control scheme for selective harmonics compensation was proposed for shunt active power filters. Based on the conventional PI control, the new method extracts the main harmonics （the 5th and 7th harmonics mainly） respectively, which are controlled by different PI controllers independently. Simultaneously, another PI controller is employed to deal with the other harmonics all together. The design method is provided, which increases the system loop gain to follow the main harmonics, improves the compensation capability of APFs, and achieves the control system an perfect frequency response. Conclusions are supported by both simulations and experimental results on a 30-kVA laboratory APF, indicating a reduction in line current THD factor from 23.21% to 3.75%.

关 键 词：有源电力滤波器 PI控制 闭环增益 系统稳定性 选择性谐波电流控制 

分 类 号：TM85[电气工程—高电压与绝缘技术]