APF谐波电流检测的积分法与低通滤波法的比较研究  

Comparison Research on Integral Method and Low Pass Filter Method of Harmonic Current Detection for APF

作　　者：李自成[1] 孙玉坤[1] 

机构地区：[1]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《电测与仪表》2009年第3期35-39,共5页Electrical Measurement & Instrumentation

基　　金：江苏省高校研究生科技创新计划项目(1221140004)

摘　　要：积分法和低通滤波法都是以非线性负载电流的Fourier级数表示为理论依据的两种有源电力滤波器(APF)谐波与无功电流检测方法。为了弄清楚这两种方法的检测性能孰优孰劣,建立了对这两种方法进行比较研究的MATLAB仿真模型,在此基础上,对这两种方法在电源电压无畸变、电源电压发生畸变和电源频率发生变化时进行了仿真比较。比较研究发现:在电源电压无畸变时,当负载电流处于稳定状态时,积分法的检测精度高于低通滤波法的检测精度,当负载电流处于变化状态时,积分法的跟踪速度快于低通滤波法的跟踪速度;在电源电压发生畸变时,积分法与低通滤波法的检测精度无明显差别;在电源频率发生变化时,低通滤波法的检测精度明显地高于积分法的检测精度。Integral method and low pass filter method are two harmonic and reactive currents detection methods, whose theoretical foundation are non-linear load current＇s Fourier series express. For the sake of making clear whose detection performance is better, the MATLAB simulation model of comparing the two methods is created. On basis of this, simulative comparisons between the two methods are done when the source voltage has no distortion, the source voltage has distortion, and the power supply frequency has variation. The comparisons find： when the source voltage has no distortion, the detection precision of the integral method is higher than that of the low pass filter method when the load current is placed in stable state, and the tracking speed of the integral method is faster than that of the low pass filter method when the load current is placed in mutative state; when the source voltage has distortion, the detection precisions of the two methods have not obvious difference; when the power supply frequency has variation, the detection precision of the low pass filter method is higher than that of the integral method.

关 键 词：有源电力滤波器(APF) 非线性负载电流 基波有功电流 基波无功电流 谐波电流 FOURIER级数 积分器 低通滤波器 

分 类 号：TM93[电气工程—电力电子与电力传动]