补偿电流最小原理的谐波检测方法研究  

Research on the Detecting Approach of Harmonic Currents Based on the Minimum Compensated Current

作　　者：魏胜宏[1] 朱本坤[1] 

机构地区：[1]镇江市高等专科学校电子信息系,江苏镇江212003

出　　处：《电测与仪表》2013年第2期41-44,共4页Electrical Measurement & Instrumentation

摘　　要：针对单相谐波电流的检测,中提出了补偿电流最小原理的检测方法,即当待测基波电流与负载实际基波电流相等时注入电网的补偿电流最小。基于这个原理,检测谐波电流需要计算出一个电源周期内负载电流与待测基波电流之差的最小平方值。本文给出了两种计算方法,一种是利用导数求极小值法,得出与电流平均值谐波检测方法相同的计算形式,该方法计算量较小,结果准确,实时性好;另一种方法是电流幅值搜索算法,将待测基波电流幅值按一定步长变化,搜索最佳幅值,该方法能准确地检测基波电流幅值,能有效跟踪电流变化,计算量稍大,延时为一个电源周期。For single-phase harmonic current detecting, this article proposes a measuring method with the principle of minimum compensation current, in which the compensation current reaches the minimum value when the fundamental current to be measured is equal to the real fundamental current of the load. Based on this principle, the harmonic current measuring is to calculate the minimum square value of the difference between the load current and the harmonic current to be measured. Two ways for calculation are given in the paper. One is to calculate the minimum value by derivative, to get the same calculation form with the harmonic measuring method of average current, with the advantages of low calculation amount, accurate result and good real-time performance. The other way is current amplitude searching algorithm, which is changing the current amplitude with a certain step to search the best amplitude, and this method can measure the current amplitude accurately and can trace the current changing effectively, but with the disadvantages of higher calculation amount and the delay time is one power supply period.

关 键 词：谐波检测 仿真 最小补偿原理 

分 类 号：TM74[电气工程—电力系统及自动化]