一種并聯逆變器瞬時電流控制策略
馬翔宇, 肖黎明
(華中科技大學 電氣與電子工程學院，湖北 武漢 430074)
摘 要： 高效的負載電流分配和環流抑制策略是逆變器并聯運行的關鍵，提出了一種基于環流前饋的瞬時電流控制策略。通過建立PID 閉環控制逆變器數學模型，對輸出等效阻抗進行分析，引入瞬時環流前饋控制策略，利用配置虛擬環流阻抗以達到負載均分和抑制環流的目的。Matlab/Simulink仿真證明了該策略的正確性，該方案易于實現，便于進行數字化控制。
關鍵詞： 并聯逆變器；環流前饋；虛擬環流阻抗
中圖分類號：TM464 文獻標識碼：A 文章編號：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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