两种基于瞬时功率理论的单相电路谐波电流检测方法的比较研究  

Comparison Research on Two Harmonic Current Detection Methods of Single-phase Circuit Based on Instantaneous Power Theory

作　　者：李自成[1] 孙玉坤[1] 朱志萤[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8期33-38,共6页Electrical Measurement & Instrumentation

摘　　要：基于三相电路瞬时无功功率理论的单相电路谐波电流检测方法(延时最短的方法2)和基于单相电路瞬时功率理论的单相电路谐波电流检测方法都是基于瞬时功率理论的有源电力滤波器谐波电流检测方法,而后者比前者简单许多。为了弄清楚后者的检测性能,根据这两种方法的MATLAB仿真模型,建立了对它们的检测性能进行比较的MATLAB仿真模型。在此基础上,对它们进行了仿真比较。比较发现:在电源电压无畸变时,当负载电流处于稳定状态时,后者的检测精度略低于前者,而当负载电流处于变化状态时,这两种方法都能够平滑地跟踪基波有功电流幅值,它们的动态响应时间无明显差别;在电源电压发生畸变时,后者的检测精度明显地低于前者;在电源频率发生变化时,后者的检测精度明显地高于前者。The harmonic current detection method of single-phase circuit based on the instantaneous reactive power theory of three-phase circuit （the method 2 which has the shortest time delay） and the harmonic current detection method of single-phase circuit based on the instantaneous power theory of single-phase circuit are two harmonic current detection methods for active power filter based on instantaneous power theory, and the latter is much simpler than the former. For the sake of making clear the latter＇s detection performance, according to the MATLAB simulation models of the two methods, the MATLAB simulation model of comparing the two methods is created. On the basis of this, simulative comparisons between the two methods are done. The comparisons find： when the source voltage has no distortion, the detection precision of the latter is a bit lower than that of the former when the load current is placed in stable state, and they can smoothly track the amplitude of the fundamental active current and their dynamic-responding-times have no obvious difference when the load current is place in mutative state; when the source voltage has distortion, the detection precision of the latter is clearly lower than that of the former; when the frequency of the power supply shifts, the detection precision of the latter is clearly higher than that of the former.

关 键 词：有源电力滤波器 谐波电流 瞬时功率理论 低通滤波器 MATLAB仿真模型 检测精度 

分 类 号：TM93[电气工程—电力电子与电力传动]