畸变电源电压下的谐波检测方法与仿真研究

Harmonic Detecting Method and Simulating Study under Distorted Supply Voltage

准确、快速、容易实现的谐波检测方法对于有源滤波器的控制十分重要。在总结现有谐波检测理论的基础上提出了一种谐波检测方法。该方法不受电源电压畸变的影响,通过对三相电源电压的预处理分离出电压正序分量,进而利用d-q变换实现了电流基波正序有功分量的准确检测;分析了电压电流的基波正序分量夹角对检测结果的影响;给出了一种缩短检测信号移相延时的策略。仿真结果表明该方法能够准确快速地进行谐波检测。

An exact, fast, and easily implemented method of detecting harmonic is important to the control of active filter. A method of detecting harmonic was brought forward by summarizing the existing harmonic detecting theories. This method is not affected by the distorted power voltage and it separates the voltage positive-order component by pretreating the three phase power voltage. Then it implements the exact detecting of the current fundamental wave positive-order active component using d-q transformation. It also analyzes the effect on the detecting results by the fundamental wave positive-order component of voltage and current and gives a strategy of shorting the detecting signal phase-shifting time-delay. The simulation result indicates that this method can detect the harmonic fast and exactly.