串联型电力有源滤波器中低通滤波器的设计及参数优化

串联型电力有源滤波器（简称SAPF）是为解决用户端供电电压中存在的电能质量问题而设计的一种有源滤波器。它利用PWM逆变器产生与电网畸变电压大小相等，方向相反的脉宽调制波，经低通滤波器（简称LPF）滤除开关纹波后通过变压器串联在电网中，以达到稳定负载端电压，改善电能质量的目的。目前研究主要集中在控制方法和波形瞬时畸变的实时检测上，对LPF涉及很少，而LPF的好坏会影响SAPF能否正常应用，研究发现对于不同的频率，LPF在SAPF中作用的电路结构并不相同，因此传统的LPF设计方法并不完全应用，在深入研究的基础上，文中提出了一套分频段的LPF设计和参数优化方法，仿真和实验结果都验证了该文所给方法的正确性。

DESIGN AND OPTIMIZATION OF PASSIVE LOW-PASS FILTERS FOR SERIES ACTIVE POWER FILTERS

The main goal of the se ries active power filter(SAPF) is to filter the various voltage distortions at c ustom terminal. It produces a voltage, which has equal amplitude and opposite di rection against the distortion voltage contained in power system with PWM invert er, and then it is injected to network through transformer by lower-pass filter (LPF).Nowadays,research about SAPF is mainly focused on the detection of the v o ltage distortion and little on LPF, which influence the systemic feature of SAPF . The traditional design methods of LPF are not very suitable because SAPF with LPF has different circuit topologies for different frequencies. Therefore, based on detail research, a frequency-varied design and optimization method for LPF i s presented in this paper. The correctness and effectiveness of the method are e xperimentally verified.