基于电流分解的单相无功功率定义及测量方法

Research on a Novel Single Phase Reactive Power Definition and Measurement Based on Current Decomposition

周期非正弦激励电路中的无功功率定义是一个颇具争议的问题。本文提出了一种基于Fryze时域电流分解的单相无功功率定义方法,给出了这种定义下正弦激励下各种线性元件和非线性元件的无功功率表达式,以及非直线激励下线性电阻元件的无功功率表达式。推导结果表明,这种无功定义能更加直接地准确定位系统中的谐波源,更加有利于谐波治理和无功的实时补偿,文章最后给出了基于Matlab的电流分解算法,为无功实时补偿和无功电能计量奠定了基础。

Reactive power definition for the circuits with non-sinusoidal excitations is a controversial topic for a long time. A novel single phase reactive power definition based on Fryze＇s current decomposition in time domain is proposed in this paper. Reactive power expressions of various linear and nonlinear loads both in sinusoidal and non-sinusoidal circuits are deducted separately. Results show that the novel definition can locate the harmonic source accurately and therefore is effective for harmonic harness and reactive power compensation in real time. Current decomposition is realized by Matlab at the end of the paper, which forms a good basis for reactive power compensation in real time and reactive power energy measurement.