风力发电大功率并网发电逆变器研究.pdf

第 27 卷第 16 期中国电机工程学报 Jun. 2007
2007 年 6 月 Proceedings of the CSEE ©2007 .
文章编号:0258-8013 (2007) 16-0054-06 中图分类号:TM46 文献标识码:A 学科分类号:470×40
风力发电用大功率并网逆变器研究
张强,张崇巍,张兴,谢震
(合肥工业大学电气与自动化工程学院,安徽省合肥市 230009)

Study on Grid-connected Inverter Used in High-power Wind Generation System
ZHANG Qiang, ZHANG Chong-wei,ZHANG Xing,XIE Zhen
(School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, Anhui Province, China)
ABSTRACT: In high-power wind power generation system, 为电机连接电网的核心装置获得广泛应用[1-3]。由于
voltage source grid-connected inverter is important for energy 采用 PWM 控制技术,并网逆变器交流侧具有可控
conversion and transmission. But the output current with 功率因数,正弦化输出电流波形,以及可以实现电
harmonic distortion is increased due to the invertar’s low 能的双向传输等优点[4-7]。但是由于风力发电用并网
switching frequencies. This filter, typically a series inductance,
逆变器功率容量较大, 直流母线两端的电压较高,
acts to reduce the switching harmonics entering the distribution
因此为降低功率器件应力使得 PWM 信号开关频率
network. An alternative filter is a T-filter, which can achieve
reduced levels of harmonic distortion at lower switching 受到限制,频率范围通常在 1~3kHz 之间。开关频
frequencies. But it make instability is bring to system by using a 率的降低导致逆变器网侧输出电流中的谐波分量增
T-filter. This paper proposes a robust strategy for regulating the 加。文献[8]指出当交流输出电压受控时,逆变器的
grid current entering