基于新型检测方法的单相并联有源滤波器

Single-phase shunt active power filter based on novel detection method

提出一种基于新型检测方法的单相并联有源滤波器。该有源滤波器采用新型基波相位和频率检测方法,基于该检测方法采用单周期复位积分方法计算出谐波电流。输入信号经过A/D变换得到数字信号,经过频率校正环节后可得到与输入信号基波分量相同角频率的信号,该信号再经过初相校正环节后就可以得到与输入信号基波分量同频率、同初相的相位信号,从而实现对输入信号中基波分量的跟踪。该相位检测方法不需要通过闭环校正,显著提高了检测跟踪速度,暂态响应时间小于20ms。利用该方法检测出电网电压基波分量单位正弦信号,采用单周期复位积分法,可以得到负荷电流基波分量的幅值,从而方便地计算出电流中的谐波分量。仿真和实验结果证明了所提方法的正确性和有效性。

A single-phase shunt APF（Active Power Filter） is proposed,which works out the harmonic current using single-cycle reset integration based on new fundamental frequency and phase detection method. The input signal is changed into digital signal by A/D conversion,and then adjusted by frequency correction link and phase correction link to obtain a unit sine wave with same frequency and phase as the fundament component of input signal. Thus the fundament component of input signal is traced. The proposed method without closed-loop corrections improves the tracing speed of detection and leads the transient response time less than 20 ms. Using one cycle reset integration,the magnitude of the fundament component is then obtained. Hence the harmonic component of current can be easily obtained. Simulation and experiment prove it corrective and effective. This project is supported by Doctoral Program Funds of MOE in China（20030248043）.