基于改进SOGIQ PLL与卡尔曼滤波的APF谐波检测方法研究

Research on Harmonic Detection Method of APF Based on Improved SOGIQ PLL and Kalman Filter

谐波污染的有效治理是电能质量控制的关键。基于有源电力滤波器可实现对谐波的跟踪及补偿的优点,电网中常采用有源电力滤波器实现谐波的治理,但有源电力滤波器谐波检测应用的传统i_(p)-i_(q)法存在检测精度低、速度慢的问题。正基于此,该文提出了一种融合二阶广义积分正交锁相环和卡尔曼滤波器的新型i_(p)-i_(q)谐波检测方法。以改进型二阶广义积分正交锁相环,提高相角检测准确度;以卡尔曼滤波器提升滤波跟踪实时性。通过理论推导结合仿真分析,结果表明该方法能实现谐波的有效补偿,从而提升谐波检测准确性。

Effective treatment of harmonic pollution is the key to power quality control. Based on the advantages that the active power filter can realize harmonic tracking and compensation,the active power filter is often used in harmonic detection of power grids to realize harmonic control,but the traditional i_(p)-i_(q) method used in harmonic detection of the active power filter suffers from low accuracy and slow speed. To this end,this paper proposes a novel i_(p)-i_(q) harmonic detection method which integrates the second order generalized integral orthogonal phase-locked loop and Kalman filter. An improved second-order generalized integral orthogonal phase-locked loop is used to improve the accuracy of phase angle detection. Kalman filter is used to improve filtering tracking in real time. Through theoretical derivation and simulation analysis,the results show that the proposed method can effectively compensate harmonics and improve the accuracy of harmonic detection.