基于KF-DDSRF-PLL的改进锁相环实现研究

余豪强; 魏伟

基于KF-DDSRF-PLL的改进锁相环实现研究

余豪强,
魏伟

RESEARCH ON DECOUPLED DOUBLE SYNCHRONOUS REFERENCE FRAME PLL BASED ON KALMAN FILTERING

摘要

摘要: 运用锁相环技术（Phase-Locked Loop,PLL）确保多种电力电子设备与电网实时同步稳定运行是一个重要课题。针对传统双同步坐标系解耦锁相环（Decoupled Double Synchronous Reference Frame PLL,DDSRF-PLL）在电网中出现谐波污染以及三相电压不平衡时不能精准的检测到基波正序电压的幅值与相位的问题，提出了基于卡尔曼滤波器（Kalman Filtering，KF）的KF-DDSRF-PLL技术。该方法通过引入KF对正负序解耦后的q轴电压分量进行滤波处理，实现了对基波正序电压相位快速和精准的获取。在MATLAB/Simulink中建立模型并进行仿真实验,实验结果表明KF-DDSRF-DPLL在上述故障环境下能够快速准确的锁定基波正序电压相位幅值,验证本文所提KF-DDSRF-PLL算法的有效性。

Abstract: The use of phase-locked loop technology to ensure real-time synchronization and stabilization of a variety of power electronic equipment with the power grid is an important issue. Aiming at the decoupled double synchronous reference frame PLL,DDSRF-PLL.When harmonic pollution and three-phase voltage imbalance occur in the three-phase network,the amplitude and phase of the fundamental positive sequence voltage cannot be accurately detected.Based on the above question,the KF-DDSRF-PLL based on Kalman Filtering(KF) is proposed.This method introduces KF to filter the positive,negative sequence and decoupling q-axis voltage components,and realizes the fast and accurate acquisition of the fundamental positive sequence voltage. Model is established and simulated in MATLAB/Simulink.The experimental results show that KF-DDSRF-DPLL can quickly and accurately lock the fundamental positive sequence under the above-mentioned fault environment.The voltage phase amplitude verifies the effectiveness of the KF-DDSRF-PLL algorithm proposed in this article.

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