一種并聯(lián)逆變器瞬時電流控制策略
馬翔宇, 肖黎明
(華中科技大學(xué) 電氣與電子工程學(xué)院，湖北 武漢 430074)
摘 要： 高效的負(fù)載電流分配和環(huán)流抑制策略是逆變器并聯(lián)運(yùn)行的關(guān)鍵，提出了一種基于環(huán)流前饋的瞬時電流控制策略。通過建立PID 閉環(huán)控制逆變器數(shù)學(xué)模型，對輸出等效阻抗進(jìn)行分析，引入瞬時環(huán)流前饋控制策略，利用配置虛擬環(huán)流阻抗以達(dá)到負(fù)載均分和抑制環(huán)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(xiàn)，便于進(jìn)行數(shù)字化控制。
關(guān)鍵詞： 并聯(lián)逆變器；環(huán)流前饋；虛擬環(huán)流阻抗
中圖分類號：TM464 文獻(xiàn)標(biāo)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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