基于DSP的高精度單相軟件鎖相環(huán)的實現(xiàn)
張啟亮，劉倩影
(國網(wǎng)濟寧供電公司，山東 濟寧 272000)
摘 要：介紹了一種二階巴特沃斯差分方程的計算方法和基于瞬時無功理論的三相鎖相環(huán)，并提出了一種改進的單相低通鎖相環(huán)算法。利用Matlab 軟件和TMS2812 DSP 數(shù)字信號處理器對工頻、幅值跳變、頻率變化下的電壓信號進行了仿真和編程驗證，結(jié)果表明該算法能快速實現(xiàn)對畸變電壓高精度地鎖相，具有構(gòu)造簡單、精度高、鎖相快等優(yōu)點。
關(guān)鍵詞：二階巴特沃斯；瞬時無功理論；三相鎖相環(huán)；軟件鎖相環(huán)
中圖分類號：TM714.3 文獻標識碼：A 文章編號：1007-3175(2016)03-0029-04
Implement of High-Precision Single-Phase Software Phase-Locked Loop Based on DSP
ZHANG Qi-liang, LIU Qian-ying
（State Grid Jining Power Supply Company, Jining 272000, China）
Abstract: 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 algorithm. 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.
Key words: second order Butterworth; instantaneous reactive power theory; three phase-locked loop; software phase-locked loop
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