分布式发电系统并网电流控制  

Grid-Connected Current Control for Distributed Generation System

作　　者：陈哲照[1] 沈宏[2] 阮涛 张增强[4] 

机构地区：[1]广西电力工业勘察设计研究院,南宁530023 [2]河南科技学院,河南新乡453003 [3]邢台供电局,河北邢台540001 [4]西安理工大学,西安710048

出　　处：《电网与清洁能源》2008年第11期16-19,共4页Power System and Clean Energy

摘　　要：在分布式发电并网发电系统中,需要对并网电流进行控制并达到输出功率因数为1的目的。分析了4种常用的输出电流控制方法,比较了其优缺点。针对并网逆变器功率开关频率较高、并网电流谐波总畸变率过大的问题,提出了一种改进的正弦电流滞环宽度控制方法。该法具有倍频控制效果,可以减少功率开关管的损耗,提高系统的稳定性;在降低输出系统电流谐波方面,有利于提高系统的稳定性和运行效率。In the distributed generation system, the grid-connected current need to control for ensuring the power factor 1. This paper compares and analyzes four existing current control methods,points out their advantages and weaknesses. In order to solve the problems of higher switching frequency and bigger total harmonic distortion of system current, this paper proposes a new current control method with three-level hysteresis-band sine current control. The control method makes frequency doubling, reduces switching frequency and ameliorate total harmonic distortion of system current, which is helpful to improve the stabilization and efficiency of grid-connected operating.

关 键 词：分布式发电 电流控制 开关频率 谐波总畸变率 

分 类 号：TM762[电气工程—电力系统及自动化]