基于改进型谐波检测方法的并联型有源滤波器的闭环控制  

Close-loop control for shunt active power filter based on improved harmonics detecting method

作　　者：刘国海[1] 薛文平[1] 

机构地区：[1]江苏大学电气信息工程学院,镇江212013

出　　处：《东南大学学报（自然科学版）》2005年第A02期117-121,共5页Journal of Southeast University：Natural Science Edition

基　　金：江苏省高新技术资助项目(BG2004024;GY2005006;04CX02)

摘　　要：介绍了一种基于改进型谐波检测方法的并联型有源滤波器的闭环控制方案.该改进型检测方法用积分、延时和增益环节代替传统ip,iq检测方式中的低通滤波器,检测延时可减少到1/6个电源周期,同时这种方法可以推广到单相、三相四线电路和三相不平衡负载的场合中.采用三角载波方法进行电流闭环跟踪,主电路器件开关频率固定且补偿电流准确跟踪指令电流.基于能量平衡原理并借助检测环节实现了逆变器直流侧电压的闭环控制.仿真结果验证了该控制方案的正确性,采用该方案后,电源电流得到有效改善.Close-loop control for shunt active power filter based on improved harmonics detecting method is introduced. This improved detecting method substitutes the low pass filter in conventional ip, iq method by integration, delay and gain, which can reduce the detecting delay to 1/6 of source period. Meanwhile, this method can be applied to a single-phase circuit, three-phase four-wire circuit and three unbalanced loads. Triangular cartier waveforms are used in current close-loop tracking, so that the switching frequency of the device in the main circuit remains constant and the compensation current follows the reference current accurately. DC voltage close-loop control is achieved in the detecting unit on the basis of power balance theory. Simulation restilts prove the validity of the control method. Source current is effectively compensated after the control method is adopted.

关 键 词：并联型有源滤波器 谐波检测 电流跟踪 直流侧电压控制 

分 类 号：TN713.8[电子电信—电路与系统]