电工技术学报2018，Vol.33Issue(7)：1450-1460,11.DOI:10.19595/j.cnki.1000-6753.tces.161240
基于下垂控制的逆变器无线并联与环流抑制技术
Wireless Parallel and Circulation Current Reduction of Droop-Controlled Inverters
摘要
Abstract
The power transmission and circulating current characteristics of a parallel-inverter system are firstly analyzed in this paper. It reveals that the difference of the line impedance and the deviation of the output voltages between two parallel units both have significant effects on the power sharing accuracy of reactive power under the condition of the inductive line impedance. An adaptive virtual impedance method is proposed to reduce the difference of the equivalent connection impedance of the parallel system to some extent, and the power sharing accuracy will be obviously improved by keeping the equivalent connection line impedance inductive. Additionally, an improved droop control strategy, which forms the equivalent droop control curve like a parabolic shape, is further put forward by using the feedback of AC bus voltage, realizing the trade-off between power sharing accuracy and output voltage sag effectively. With the proposed control strategy, the current circulation can be drastically suppressed and the system overall performance is greatly improved. Finally, the validity of the theoretical analysis and the proposed strategy is proved by simulation and experimental results.关键词
下垂控制/虚拟阻抗/功率均分/环流Key words
Droop control/virtual impedance/prower sharing/circulating current分类
信息技术与安全科学引用本文复制引用
陈杰,刘名凹,陈新,钮博文,龚春英..基于下垂控制的逆变器无线并联与环流抑制技术[J].电工技术学报,2018,33(7):1450-1460,11.基金项目
江苏省产学研合作前瞻性联合研究项目(BY2015003-05)和台达环境与教育基金会《电力电子科教发展计划》(DREG2016006)资助. （BY2015003-05）
