基于互感器的数字锁相环设计

Design of digital phase-locked loop based on transformer

针对传统锁相环精度差、速度慢等问题,利用互感器实现了一种基于预测电流无差拍方法的改进功率解耦控制的数字锁相环,很好地解决三相逆变器在并网运行时锁相问题。仿真分析和实验结果表明,该数字锁相环在电网频率发生变化时,能快速准确跟踪上电网电压相位,证实此方法在逆变器并网锁相时具有良好的效果。

A novel digital phase-locked loop was realized based on transformer combined with the method of predictive current deadbeat improved decoupling control, aiming at the problem of traditional analog phase-locked loop with low precision and slow speed, which can solve the problem of phase locked. The digital phase-locked loop can follow the voltage phase quickly and accurately when grid voltage changes, good performance in phase locked of the control method are verified by simulation and experimental results.