摘要
级联H桥光伏并网系统中,H桥直流侧光伏板的环境、参数差异及故障等多种因素均会导致模块间光伏板最大功率点电压产生差异,此时,传统载波移相调制策略的倍频效应失效,输出电压的低频谐波分量无法消除。本文通过简化的谐波分析法对载波移相输出电压的谐波表达式进行详尽的分析,并基于此提出一种移相角实时控制算法来消除系统输出电压低频谐波在载波频率及其倍数处的畸变,最后以三模块级联系统为例进行实验,验证所提算法的有效性和可行性。
In the cascaded H-bridge PV grid-connected system,many factors could result in non-equal maximum power point voltages of photovoltaic panel among cascaded modules,such as hostile environment,the parameter differences and the faults of the DC sources.At this point,the frequency doubling effect of traditional phase-shifted pulse width modulation becomes invalid.Thus,the low frequency harmonics component of output voltage can’t be eliminated.In this paper,the harmonic expression of the total output voltage is obtained through the simplified harmonic analysis method.Based on this,a real-time correction algorithm of displacement angles is proposed eliminate harmonic distortion of low order harmonics on the carrier frequency and its multiples is proposed.The feasibility and effectiveness of this proposed algorithm are verified by the experimental results which is performed with a three-cell cascaded H-bridge inverter.
作者
王付胜
戴之强
王佳宁
毛旺
杜成孝
Wang Fusheng;Dai Zhiqiang;Wang Jianing;Mao Wang;Hieu Thanh Do(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;School of Electrical and Electronic Engineering,Hung Yen University of Technology and Education,Hung Yen 39000,Vietnam)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2020年第8期144-150,共7页
Acta Energiae Solaris Sinica
基金
国家高技术研究发展(863)计划(2015AA050607)。
关键词
级联H桥
最大功率点
谐波分析
实时控制
光伏并网逆变器
cascaded H-bridge
maximum power point
harmonic analysis
real-time control
PV grid-connected iverter
