基于DSP的双向AC/DC变换器锁相环技术的研究与实现

AC/DC Converter Research and Achieve PLL

本文主要对单相电网的双向AC/DC变换器锁相环技术进行实现方法的研究,采用单同步坐标系锁相环算法,由于本文研究的为单相系统,故需要设计一个正交信号发生器,采用基于反PARK变换的虚拟正交信号发生器得出两相静止的正交信号,并采用纯软件的锁相环算法,设计了一款网侧电压采样调理电路,最后在TMS320F28335实验平台上进行了实验验证,探讨了一种判断锁相成功的方法。经实验结果表明,该锁相环技术可以实时跟踪电网的频率和相位,并可以精确锁定相位,具有很好的实用性。

This paper mainly studies the realization method of the phase-locked loop technology of the bidirectional AC/DC converter in the single-phase power grid. The phase-locked loop algorithm in the single synchronous coordinate system is adopted. Because the single-phase system is studied, it is necessary to design an orthogonal signal generator. The virtual orthogonal signal generator based on the inverse park transform is adopted to obtain the two-phase static orthogonal signal, and the pure software phase-locked loop algorithm is adopted a network side voltage sampling and conditioning circuit is designed. Finally, it is verified on TMS320 F28335 experimental platform, and a method to judge the success of phase-locked is discussed.The experimental results show that the PLL technology can track the frequency and phase of power grid in real time, and can lock the phase accurately, which has good practicability.