摘要
为了改善基于DFT(Discrete Fourier Transform,DFT)鉴相单相锁相环方法的锁相速度和提高其在电网频率变化时的锁相精度,文章在常规基于DFT鉴相单相锁相环基础上进行了两点改进。一是减少锁相环中前向积分环节,PI调节器输出直接作为相位误差信号;二是增加电压频率跟踪环节,进而调节系统采样频率,实现同步采样。仿真和实验结果验证此改进方法的有效性。
In order to improve the speed of PLL based on DFT and enhance the phase precision when grid frequency changes,two improvements are presented in this paper. The first one is taking the post-PI regulation output as error signal of phase,and calling off the forward integrating element. The second one is the voltage frequency tracking loop is added,and adjusts sample frequency to realize synchronous sampling. The results of simulation and experimentation show the superiority of this improved method.
出处
《电测与仪表》
北大核心
2016年第5期7-10,21,共5页
Electrical Measurement & Instrumentation
基金
自然科学基金资助项目(51277024)
关键词
单相锁相环
离散傅里叶变换
动态特性
频率跟踪
同步采样
single phase locked loop
DFT
dynamic characteristics
frequency tracking
synchronous sampling
