基于DSP的高精度单相软件锁相环的实现

摘要

介绍了一种二阶巴特沃斯差分方程的计算方法和基于瞬时无功理论的三相锁相环，并提出了一种改进的单相低通锁相环算法。利用Matlab软件和TMS2812 DSP数字信号处理器对工频、幅值跳变、频率变化下的电压信号进行了仿真和编程验证，结果表明该算法能快速实现对畸变电压高精度地锁相，具有构造简单、精度高、锁相快等优点。%Introduction was made to a kind of second order Butterworth difference equation computing method and three-phase phase-locked loop based on the instantaneous reactive power theory. This paper proposed a kind of improved single-phase low-pass phase-locked loop algo-rithm. The software Matlab and digital signal processor TMS2812 were used to carry out simulation and program verification for voltage signals of power frequent, amplitude jumping and frequency change. The result shows that the proposed algorithm can rapidly achieve the purpose of locking phase for distortion voltages with simple structure, high precision and fast phase locking etc advantages.