摘要:在逆變器并聯(lián)系統(tǒng)中,由于傳統(tǒng)下垂控制對(duì)逆變器輸出阻抗性質(zhì)極為敏感,難以實(shí)現(xiàn)真正的均流。本文在分析下垂控制原理基礎(chǔ)之上,利用系統(tǒng)等效傳遞函數(shù)bode圖,研究了逆變器參數(shù)及線路連接阻抗對(duì)輸出阻抗影響;通過(guò)在控制環(huán)節(jié)加入虛擬阻抗以改善輸出阻抗性質(zhì),實(shí)現(xiàn)了功率均分,減小了模塊間環(huán)流;構(gòu)建了兩臺(tái)逆變器仿真模型,驗(yàn)證了該方案的有效性。
敘詞:逆變器 并聯(lián) 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