非正弦情况下主要无功功率测量方法的对比研究

针对电力系统无功比重的增加以及人们对无功的关注程度日益提高,本文对几种主要无功功率计算方法进行了系统、全面的对比研究。首先依据无功功率的定义,对基波移相90度、微分法、FFT法和Hilbert滤波器法等无功算法进行对比研究,分析各种算法的基本原理和理论计算精度,比较各种算法的性能优、劣;然后对各种算法的软件实现方法进行研究,并对相关算法进行资源优化使其适用于嵌入式实时平台,进一步提高各算法的性能;最后以基于DSP的高性能三相表为测试平台,对各无功算法进行准确度对比测试。数据分析表明,正弦和非正弦情况下的测试结果与各算法的理论分析结果完全一致。本文的研究成果对各种主要无功算法在优化设计以及电能计量领域的应用具有重要的指导意义。

Comparative study on several methods of reactive power measurement under nonsinusoidal conditions

The reactive power with high precision is more and more important, so several reactive power algorithms are compared systematically and comprehensively.This paper firstly describes reactive power defined by Budeanu, and investigates several algorithms based on the definition.In order to compare advantages and drawbacks of the algorithms, the fundamental theory and computational accuracy of the algorithms, including fundamental phase shift 90 degree, differential, FFT, Hilbert digital filter, are analyzed.At the same time, according to hardware platform performance, the algorithms are improved.Furthermore, the methods of software implementation are investigated.Finally, comparison tests of the algorithms are implemented at high accuracy three-phase meter based on DSP.The analysis data shows that, under sinusoidal and non-sinusoidal conditions, simulation and experimental results perfectly coincide.The study is instructive for optimizing the design of reactive power algorithms and electric energy metering.