有源电力滤波器负载电流谐波检测中的低通滤波器设计与改进

Design of Low Pass Filter in Harmonic Detection of Load Current of Active Power Dilter and Improvement

基于有源电力滤波器是解决电网谐波问题的一种重要方法,实时准确地检测出负载电流的谐波,有源电力滤波器是进行谐波电流补偿的关键。针对基于瞬时无功功率理论的谐波检测方法,给出了dq坐标系下的巴特沃斯低通滤波器设计方法,提出一种具有较高的稳态性能和响应速度的滑动平均滤波器。在仿真中比较了两种滤波器的性能,并进行了负载电流谐波检测的实验。仿真和实验结果表明,给出的巴特沃斯滤波器设计方法正确可行,所给出的滑动平均滤波器具有更高的稳态性能和响应速度。

Active power filter(APF)is an important method to solve the harmonic problem of power grid.It can detect the harmonic of load current accurately in real time.APF is the key of harmonic current compensation.Aiming at the harmonic detection method based on instantaneous reactive power theory,this paper presents the design method of Butterworth low-pass filter in dq coordinate system,and proposes a moving average filter with high steady-state performance and response speed.In the simulation,the performance of the two filters is compared,and the experiment of load current harmonic detection is carried out.Simulation and experimental results show that the design method of Butterworth filter is correct and feasible,and the sliding average filter has higher steady-state performance and response speed.