針對光伏分布式電源并網(wǎng)系統(tǒng)中的相位跟蹤控制問題，分析了數(shù)字鎖相環(huán)控制技術(shù)存在的缺點，提出一種基于數(shù)字移相器的相位跟蹤控制方法。實驗利用MSP430產(chǎn)生SPWM信號合成正弦波模擬光伏逆變電源系統(tǒng)。采用基于數(shù)字移相器思想的開環(huán)控制方式，實現(xiàn)了無誤差頻率跟蹤，高精度的相位跟蹤。實驗結(jié)果表明，該方法控制速度快、精度高。

　　Abstract:

　　To solve the phase tracking in grid-connection system of solar distributed power supply， the shortage of digital phase locked loop(DPLL) technology is analyzed， also a control method of phase tracking based on digital phase-shifter is proposed. In the experiment， SPWM was produced to synthesize sine wave with MSP430， which is aimed at simulating solar inverter system. In this system， the open loop control method， which is based on the principle of digital phase-shifter， realized zero-error frequency tracking and precise phase tracking. The results show that this method has speedy control and high precision.