兼顾连线阻抗差异的逆变器无线并联  

A Wireless Parallel Control Method of Inverters With Connection Impedance Differences Being Taken Into Account

作　　者：李婷[1] 马皓[1] 刘秦维[1] 尹艺迪[1] 

机构地区：[1]浙江大学,电气工程学院,浙江杭州310027

出　　处：《电力电子技术》2013年第4期30-32,38,共4页Power Electronics

摘　　要：针对逆变器无线并联系统中连线阻抗(即输出阻抗与引线阻抗之和)差异带来的均流误差,对逆变器无线并联系统模型分析得出,逆变器连线阻抗差异会导致阻抗上的电压降不相等,进而导致有功、无功功率不能均分。为此提出一种新型改进下垂法,该方法根据连线阻抗值对幅值下垂控制方程中的下垂系数进行调整,从而改善了连线阻抗差异带来的均流误差。并给出系统小信号建模分析和控制参数的设计过程,最后通过对比新型改进下垂法与经典PQ下垂法获得的并机波形,验证了新型改进下垂法能够改善由连线阻抗差异带来的系统均流误差。Aiming at the situation that inverter parallel system has poor current sharing under different connection impedance （which equals output impedance plus line impedance）, the inverter parallel model is analyzed with the re- sult that the unequal voltage drop is the origin of the poor power sharing.A novel wireless parallel control method is proposed, from the aspect of the connection impedance voltage compensation.The impact of the connection impedance is eliminated, through a value of the connection impedance-related being subtracted from the droop parameters in front of the active and reactive power from the amplitude droop control equation.Small signal model is built and analyzed to select the appropriate droop parameters.Finally,the result obtained by the novel control method and the result ob- tained by the classical control method are analyzed comparatively.The comparison shows that the novel droop control method can effectively improve parallel systems＇ current sharing performance.

关 键 词：下垂控制 连线阻抗差异 均流误差 

分 类 号：TM76[电气工程—电力系统及自动化]