基于瞬时无功功率的改进型谐波电流检测方法

三相瞬时无功功率理论,结合电机分析理论中的旋转坐标系思想(Park变换),改进了传统的i_p-i_q运算方式,把三相电流置于旋转坐标系中进行改进,进而提出了一种改进型谐波电流检测方法.新方法利用基波分量与谐波分量的不同特性,在旋转坐标系中对基波分量和谐波分量进行分离,求得谐波旋转分量,然后对分量进行反变换便可直接得到静止坐标系中需要检测的三相谐波电流.仿真结果表明,不论负载电流突变与否,改进型检测方法比传统方法的响应速度更快,检测精度更高.

An Improved Harmonic Current Detection Method Based on the Theory of Instantaneous Reactive Power

Based on the instantaneous reactive power theory and rotation of coordinate method in motor analytical theory(Park transform) , a new advanced harmonic current testing method was proposed by improving the traditional I_p- I_q calculating method. Fundamental and harmonic component are separated in rotation coordinate system accord-ing to differences in characteristics,then the harmonic rotationul component can be obtained. By anti-transforming the harmonic rotational component, the harmonic current can be gained directly in the rest coordinate system. Simu-lation results show that the improved method has faster response and higher detecting precision than the traditional method whether the current changes rapidly or not.