浅谈基于瞬时无功功率理论的谐波电流检测方法

Harmonic Current Detection Method Based on Instantaneous Reactive Power Theory

理想情况下,电源以恒定频率向电网供电,电网中的电压和电流都是具有相同频率的正弦量。但随着无功补偿装置、变流装置及非线性负载的不断增多,谐波的影响越来越大。谐波污染作为三大"电力公害"之一,使波形出现畸变,在非正弦波的情况下,传统的功率理论不再试用。目前基于瞬时无功功率理论的谐波检测方法是谐波检测中使用较为普遍、计算较为简单的一种,国内外学者通过研究提出了很多基于该理论的检测方法。就基于瞬时无功功率理论的谐波电流检测方法进行了论述。

Ideally, the power supplies to grid at a constant frequency, and the voltage and current in grid are sinusoidal with the same frequency. However, with the increase of reactive power compensation devices, converter devices and nonlinear loads, the influence of harmonics is more and more great. As one of the three ＂power pollution＂, harmonic pollution makes waveform distorted. In the case of non-sinusoidal wave, the traditional power theory cannot be applied. At present, the harmonic detection method based on instantaneous reactive power theory is a common harmonic detection with a simple calculation. Through research domestic and foreign scholars put forward many detection methods based on this theory. The harmonic current detection method based on instantaneous reactive power theory is discussed in this paper.