一种并联逆变器瞬时电流控制策略
马翔宇, 肖黎明
(华中科技大学 电气与电子工程学院，湖北 武汉 430074)
摘 要： 高效的负载电流分配和环流抑制策略是逆变器并联运行的关键，提出了一种基于环流前馈的瞬时电流控制策略。通过建立PID 闭环控制逆变器数学模型，对输出等效阻抗进行分析，引入瞬时环流前馈控制策略，利用配置虚拟环流阻抗以达到负载均分和抑制环流的目的。Matlab/Simulink仿真证明了该策略的正确性，该方案易于实现，便于进行数字化控制。
关键词： 并联逆变器；环流前馈；虚拟环流阻抗
中图分类号：TM464 文献标识码：A 文章编号：1007-3175(2014)07-0020-04
An Instantaneous Current-Sharing Control Strategy for Parallel-Connected Inverters
MA Xiang-yu, XIAO Li-ming
（School of Electrical and Electronic Engineering, Huazhong University of Science & Technology, Wuhan 430074, China）
Abstract: High efficiency load-current sharing control and circulating current retraining strategy is the key of inverters parallel operation. This paper proposed an instantaneous current-sharing control strategy based on the circulating current feed-forward. Via the establishment of the inverter mathematical model controlled by loop-closed PID, analysis was made to the equivalent output impedances. The instantaneous circulating current feed-forward control strategy was introduced and the configuration of virtual circulating current impedances was used to achieve the goal of load-current sharing and circulating current retraining. Simulink simulation in Matlab verifies that this strategy is correct, convenient for the implement of digital control.
Key words: parallel-connected inverters; circulating current feed-forward; virtual circulating current impedance
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