基于变动频率滤波的新型数字锁相环  

New Enhanced Digital Phase-locked Loop Based on Variable Frequency Average

作　　者：伍小杰[1] 赵冰洁[1] 符晓[1] 戴鹏[1] 

机构地区：[1]中国矿业大学信电学院,江苏徐州221008

出　　处：《电气传动》2010年第12期40-42,51,共4页Electric Drive

基　　金：江苏省普通高校研究生科研创新计划项目(CX09B_113Z)

摘　　要：提出了一种应用于单相并网系统中的基于变动频率滤波原理的优化型数字锁相环,并加入了频率控制以及初始相位角定位等模块。在保留了现有优化型锁相环结构简单,灵敏度高,动态响应快等优点的前提下、解决了其存在的抗谐波干扰能力差,频率超调大等问题。利用Matlab软件对电网电压幅值、频率和相位角的突变、谐波注入等参数变化的影响做了仿真研究。在此基础上,搭建了以TMS320F2812 DSP为控制核心的实验装置,仿真验证和试验结果证明了该方法的可行性。A new design method of enhanced digital phase-locked loop（EPLL） that used in single-phase grid-connected system was presented.The improved EPLL is based on the principle of variable frequency average（VFA） that eliminates harmonics.The modules of frequency control and initial phase angle position were added in.The model inherits some salient advantages of the existing EPLL,such as fast tracking speed,structural simplicity and high sensitivity.Compared with the existing EPLL,the improved EPLL provides more robustness to harmonics and frequency fluctuation that exist in the signal used as the basis of synchronization.Taking several line disturbances such as phase-angle jump,voltage sag,frequency step,and harmonics content into consideration,the proposed method was simulated in Matlab software.Real time experiments based on a TMS320F2812DSP platform were conducted for the proposed PLL.The simulation and experimental results both verify the feasibility of the method.

关 键 词：变动频率平均值 优化型锁相环 单相并网系统 滤波器 初始相角定位 

分 类 号：TM46[电气工程—电器] TM921