基于虛擬阻抗逆變器無互連線并聯均流控制

摘要：在逆變器并聯系統中，由于傳統下垂控制對逆變器輸出阻抗性質極為敏感，難以實現真正的均流。本文在分析下垂控制原理基礎之上，利用系統等效傳遞函數bode圖，研究了逆變器參數及線路連接阻抗對輸出阻抗影響；通過在控制環節加入虛擬阻抗以改善輸出阻抗性質，實現了功率均分，減小了模塊間環流；構建了兩臺逆變器仿真模型，驗證了該方案的有效性。 敘詞：逆變器 并聯 虛擬阻抗 均流 Abstract：In the system of parallel inverter, it is difficult to achieve current sharing that the conventional droop control is more sensitive to the output impedance of inverter. In this paper, through the bode diagram of equivalent transfer function of the inverter system discussthat the impedance of line and the parameters of control affect to the output impedance after understanding the droop control method. Power sharing and the circulating current reducing can be achieved by adding virtual impedance in control loopsto improve the nature of output impedance. Constructed two simulate models ofinverter to verify the effectiveness of the program. Keyword：Inverter, Parallel, Virtual impedance, Current sharing