基于二次微分的电力单相锁相环技术研究

传统的电力单相锁相环在离散化实现时会引入二次谐波问题，从而导致锁相环的精度降低。针对这一问题，提出了一种基于二次微分的二倍频消除方法，对电力锁相环输出的直流分量二次求导，然后和开始的输出进行累加，抵消输出直流分量中所含的二次谐波分量。最后，通过仿真，与传统采用低通滤波器消除二倍频分量的方法进行了对比，仿真结果验证了采用二次微分方法的可行性和有效性。;The traditional power phase locked loop will introduce secondary harmonic when it is discretized,which reduces the precision of phase locked loop.In this paper,a two frequency doubling method based on two order differential is proposed.The direct current component of the power locked loop is derived from two times,and then the output is added to the output,so that the two harmonic components in the output DC component can be offset.Finally,the feasibility and effectiveness of the improved phase-locked loop are verified by simulation analysis