基于复数滤波器的三相锁相环技术改进策略

Improvement Strategy of Three-Phase Phase-Locked Loop Technology Based on Complex Coefficient Filter

提出了一种改进型前置复数滤波器PLL(Complex Coefficient Filter PLL,CCF-PLL),以增强锁相环在非理想电网条件下的估计性能。此方案在传统的CCF-PLL基础上,提出利用二阶广义积分器(Second-Order Generalized Integrator,SOGI)滤波以及改变复数滤波器的反馈信号的方案,来增强其在非理想电网条件的估计性能。对传统CCF-PLL和改进型CCF-PLL的性能进行仿真测试,测试结果验证了所提方案的有效性。

An improved complex filter PLL(CCF-PLL)is proposed to enhance the estimation performance of the PLL under non ideal power grid conditions.Based on the traditional CCF-PLL,this scheme proposes a scheme of using a second-order generalized integrator(SOGI)to filter and change the feedback signal of the complex filter in order to enhance its estimation performance in non-ideal grid conditions.Finally,the performance of the traditional CCF-PLL and the proposed CCF-PLL is tested by simulation.The results verify the effectiveness of the proposed scheme.