APF谐波电流检测方法的研究

RESEARCH OF APF HARMONIC CURRENT DETECTION METHOD

谐波电流检测i_p-i_q法在三相系统电压不对称或发生畸变时,得到的电压初相角与期望值存在相位差,此相位差会直接影响检测结果,为解决这个误差,本文在传统检测方法的基础上提出了一种新的方法,该方法在系统电网电压不对称或发生畸变时能准确检测出基波正序有功电流,通过前置正负序分离模块来解决低通滤波器参数选取的困难以及通过后期的调节器来准确锁定基波正序电压的初相角。通过理论推导和仿真实验证明了检测方法的正确性。

There is phase difference between the voltage phase angle and expectations using the harmonic current detecting i_p- i_q method in three-phase system voltage asymmetry or distortion,the phase difference will directly affect the test results,in order to solve this error,this article on the basis of the traditional test method of this paper proposes a new method,this method in the system of power grid voltage asymmetry or distortion can accurately detect the fundamental positive sequence active current,by leading the positive and negative sequence separation module to solve the difficulties of low-pass filter parameter selection and accurate lock by the late regulator at the beginning of the fundamental positive sequence voltage phase angle. Through the theoretical derivation and simulation results prove the validity of the method.