基于快速重复控制内模的改进型复系数锁相环

Improved Complex Coefficient Phase-locked Loop Based on the Fast Repetitive Internal Model

为了实现三相电网电压的快速准确同步,分析了基于多级联式交叉解耦复系数滤波器的锁相环,针对其结构复杂以及计算量的大的缺点,提出了一种基于快速重复控制内模的改进型复系数锁相环。分析了数字实现带来的问题,并提出了基于分数阶快速重复内模的实现方法,可以准确地分离出电网电压基波正序分量,最后通过仿真验证了方法的有效性。

Aiming at fast accurate synchronization of three-phase grid voltage,this paper analyzed the phase-locked loop based on the multiple-stage paralleled complex coefficients filter with cross decoupling. In view of its complicated structure and heavy calculation burden,this paper proposed an improved complex coefficient phase-locked loop based on a fast repetitive internal model. It analyzed problems caused by digital implementation,and suggested an implementation method based on fast repetitive internal model of a fractural order.The proposed scheme could accurately extract the positive sequence component of the fundamental wave of the grid voltage. Finally,the effectiveness of the method was verified through simulation.