分布式发电系统三相变流器软件锁相环设计  

Design of the Software Phase-locked Loop for the Three-phase Converter in Distributed Power Generation System

作　　者：张东[1] 卓放[1] 师洪涛[1] 耿志清[1] 

机构地区：[1]西安交通大学,陕西西安710049

出　　处：《电力电子技术》2013年第10期43-45,共3页Power Electronics

基　　金：国家自然科技基金(51177130);台达电力电子科教发展计划重点项目(DREK2011002)~~

摘　　要：分布式发电并网要求与大电网同频同相,基于瞬时无功理论的软件锁相环可实现电网电压的实时跟踪,但是当电压存在畸变时会出现错误的相位信息。设计了一种加入二阶低通滤波器的软件锁相环,并在光伏发电的实验平台上进行了验证。实验结果表明在电网电压畸变及三相电网电压不对称时,加入二阶低通滤波器的软件锁相环比传统软件锁相环具有更好的锁相效果。Synchronous phase and frequency must be ensured when the distributed power generation system connects to the main power grid.Based on instantaneous reactive power theory,a software phase-locked loop can keep track of the voltage phase of the main grid.When the three-phase voltage of the grid is asymmetric or with harmonic compo- nents,however,the tracked plaase could be erroneous.Based on the analysis, a second-order low-pass filter is added to the software phase-locked loop.The improved software phase-locked loop is both implemented and tested in the photo- voltaic power generation platform.The experimental result shows that the software phase-locked loop with the added second-order low-pass filter performs better than original one.

关 键 词：分布式发电 软件锁相环 低通滤波器 

分 类 号：TM61[电气工程—电力系统及自动化]