电力系统及其自动化学报2017，Vol.29Issue(10)：6-11,6.DOI:10.3969/j.issn.1003-8930.2017.10.002
多逆变器并联系统环流分析及抑制方法
Circulating Current Analysis and Suppression Method for Multi-inverter Parallel System
摘要
Abstract
Multiple inverters in parallel operation can improve the power level and reliability of the system,thus they are widely applied to high power inverters. However,the inconsistencies due to carrier phase-shift will increase the sys?tem loss. First,the generation mechanism of circulating current is analyzed,the expression of the relationship between the carrier shifted phase and circulating current is formulated according to the double Fourier transform on the output voltage of inverters,and the characteristics of switching components in circulating current are obtained. Then,based on the above analysis,a control strategy of carrier-phase compensation is proposed to inhibit the circulating current caused by the carrier phase difference,which can effectively improve the control capability of the switching frequency circulat?ing current. The dual-loop control strategy,which uses PI controller for the outer voltage and deadbeat control for the in?ner current,can ensure the normal and stable operation of the inverter system. Finally,the simulation results verify the effectiveness and feasibility of the proposed control strategy.关键词
并联运行/开关环流/正弦脉宽调制/载波相位补偿Key words
parallel operation/switching frequency circulating current/sinusoidal pulse width modulation/carrier-phase compensation分类
信息技术与安全科学引用本文复制引用
阳敏,罗安,肖华根,马伏军,王皓,周小平..多逆变器并联系统环流分析及抑制方法[J].电力系统及其自动化学报,2017,29(10):6-11,6.基金项目
国家自然科学基金重点资助项目(51237003) （51237003）
