瞬时无功功率理论的研究综述

Summary of the Instantaneous Reactive Power Theory

为更好地应用电力有源滤波器技术,通过最优化数学模型的建立介绍了瞬时无功功率理论的基本内容,所谓瞬时有功电流即保证三相瞬时总能量不变而三相传输损失最小的电流;空间基变换证明,电压和电流瞬时值从a b c三相变换到αβο三相为正交变换,说明三相三线制系统或无零序电压电流时三相到两相变换的合理性,从而将αβ变换与d q变换联系起来。最后指明系统电压畸变时不宜用基于该理论的谐波检测和无功补偿方法。

This paper introduces the Instantaneous Reactive Power Theory; clarifies that the instantaneous active current is the current which makes the three-phase transmission power loss least in the condition of keeping the three-phase instantaneous power constant according to the optimal math model; tries to prove that the transformation of voltage and current instantaneous values from a b c three phases into αβ three phases is orthogonal transform, thus the transform from three-phase into two-phase is rational for the three-phase three-wire system or the system without zero-phase voltage and current; and relates αβ transform with d q transform, points out the method for harmonic detection and reactive power compensation based on this theory is not applicable when the voltage is distorted.