基于DSOGI-PLL与ANF-LPF的i_(p)-i_(q)三相谐波检测方法

Method of three⁃phase i_(p)-i_(q) harmonic detection based on DSOGI⁃PLL and ANF⁃LPF

随着分布式电源大规模接入电网,电力系统中频率波动、电压不平衡以及谐波畸变等问题日益严重。在这样不平衡和失真的电网条件下,传统i_(p)-i_(q)谐波检测法已不能满足工程需要。为解决这一问题,文中提出一种基于DSOGI-PLL与ANF-LPF的i_(p)-i_(q)三相谐波检测方法。一方面,采用DSOGI-PLL提高复杂电网下提取基波相位的能力;另一方面,采用一种具有选择性谐波滤波能力的改进结构LPF,来提高谐波检测的抗干扰能力。结果表明,所提方法能够在复杂电网条件下完成三相谐波检测。

With the large-scale integration of distributed power sources into the power grid,problems such as frequency fluctuations,voltage imbalance,and harmonic distortion in the power system are becoming increasingly serious.Under such unbalanced and distorted power grid conditions,traditional i_(p)-i_(q) harmonic detection methods can no longer meet engineering needs.To address this issue,a three-phase i_(p)-i_(q) harmonic detection method based on DSOGI-PLL and ANF-LPF is proposed.On the one hand,DSOGI-PLL is used to improve the ability to extract fundamental phase in complex power grids.On the other hand,an improved structure LPF with selective harmonic filtering capability is used to enhance the anti-interference ability of harmonic detection.The results show that the proposed method can achieve three-phase harmonic detection under complex power grid conditions.