一种基于自适应滤波器的新型单相锁相环技术

单相锁相环(SPLL)是电力系统中的重要组成元件,本文提出一种新型的基于自适应滤波器的SPLL,说明了利用基于最小均方算法的自适应滤波器产生正交信号的工作原理,并提出了一种可以实现前级正交信号产生模块和后级锁相模块解耦控制的新型SPLL结构。因为前级模块与后级模块的解耦可以大大增加比例积分(PI)控制器的带宽,所以所提出的新型锁相环可以获得比传统单相锁相环更好的动态性能。实验结果验证了新结构的可行性。

A Novel Single-Phase Phase-Locked Loop Based on Adaptive Filter

The single-phase phase-locked loop (SPLL) plays a very important role in single-phase power systems. This paper presents a new kind of SPLL based on the adaptive filter. First the least mean square algorithm based adaptive filter is used to produce the required orthogonal signals. Moreover, the decoupling function between the front-end orthogonal signals generator (OSG) and the post-stage phase locked loop is realized in the proposed SPLL structure. Compared with traditional OSG and SPLLs, the proposed SPLL can provde better dynamic performance because its bandwidth can increase significantly due to the decoupled structure. Finally, the experimental results demonstrate the feasibility of the presented SPLL.