三相电压畸变且不对称时电流基波正序有功分量的改进瞬时检测方法研究

电力有源滤波器是抑制谐波的有效手段,补偿分量的准确检测直接决定了它的补偿效果。提出了改进的三相电压畸变且不对称情况下的基波正序有功电流分量的检测方式,通过dq变换分别测出电压和电流基波正序分量的有效值和相位,求出准确的电流基波正序有功分量,从而得到需要补偿的电流分量。电压和电流基波正序分量的检测同步进行,减少了低通滤波器的延时,仿真结果说明了改进方式的有效性和正确性。

An advanced instantaneous detection method for fundamental positive-sequence active current under unsymmetrical and distorted three-phase system voltage

Active power filter is an effective device to clear harmonics. Aceurate detection of compensated components decides its compensation effect directly. This paper proposes an advanced instantaneous detection method for fundamental positive-sequence active current under unsymmetrical and distorted three-phase system voltage by detecting magnitude and phase of fundamental positive-sequence voltage and current respectively using dq transformation. Thus fundamental positive-sequence active current and the compensated current components can be obtained exactly. The detection of voltage and current are simultaneous, which reduce delay-time of lowpass filter. Simulation results illustrate efficiency and accuracy of the improved method.