一种无锁相环的ip－iq法的谐波检测方法

有源电力滤波器是对电力系统中谐波和无功功率补偿的重要装置,其关键环节之一就是能够实时准确地检测出谐波电流。在介绍传统的基于三相瞬时无功功率的i_p-i_q法基本原理的基础上,指出其检测到的基波电流出现误差的原因是由于电网的电压与其正序电压存在相位差。针对该问题提出一种无锁相环的i_p-i_q法,通过对称分量法提取电网电压的正序电压,最后用MATLAB仿真软件搭建仿真模型进行验证。

A Harmonic Detection Method Using ip -iq Non-phase-locked Loop

Active power filter is an important device in power system harmonics and reactive power compensation, and one of the key aspects is the ability to accurately detect real-time harmonic currents.On the basis of the princi-ples of the traditional three-phase instantaneous reactive power of ip -iq method, this paper pointed out that the stat-ed reasons for its fundamental currents detected error is due to the presence of voltage and its positive sequence voltage grid phase.Thus it also proposed a ip -iq method without PLL to solve this problem with the help of the ex-traction grid voltage positive sequence voltage by symmetrical components, and finally built a simulation model with MATLAB simulation software to verify it.