微网中下垂控制策略及参数选择研究  

Research on Droop Control Strategy and Parameters Selection of Microgrids

作　　者：张明锐[1] 杜志超[1] 王少波 

机构地区：[1]同济大学电子与信息工程学院,上海201804 [2]上海环保工程成套有限公司,上海200070

出　　处：《电工技术学报》2014年第2期136-144,共9页Transactions of China Electrotechnical Society

基　　金：上海市自然科学基金(13ZR1444400);上海市科委重大专项(13DZ1200403);中央高校基本科研业务费专项资金(0800219169)资助项目

摘　　要：为提高逆变器的P-f和Q-V下垂控制在中、低压网络中的适用性,提出了虚拟电感与外接输出电感的联合控制方式。设计了一种新型逆变器多环控制策略,推导其状态空间方程,建立完整的小信号模型,并依据此提出了虚拟电感与外接输出电感参数选取的"配比原则"。应用该原则可有效降低二者取值,克服了单独使用虚拟阻抗控制对系统稳定性的影响和过大外接输出电感带来的功率损耗问题。在线性和非线性负载两种工况下仿真分析,表明所提出的控制策略和依据"配比原则"所选取的参数不仅提高了逆变器的输出感抗,降低线路参数对下垂控制的干扰,而且精确微网电源间功率分配,有效抑制环流。本文为传统下垂控制在中、低压网络中应用提供了依据。To improve the applicability of conventional P-f and Q-V droop control methods of inverters in middle-voltage and low-voltage microgrids, this paper puts forward a novel control method of using virtual inductance and artificial output inductance in combination. A multiple feedback loop control strategy is proposed, the state-space equations are derived, and a complete small-signal model is established. Based on this, the matching principle of choosing virtual inductance and artificial output inductance is proposed. The inductance value is reduced significantly according to this principle, so problems of system stability and power loss are overcome. Simulation and analysis under linear and nonlinear load show that the proposed control strategy and parameter selecting method can not only enhance the output inductance of inverters, thus reduce the interference by line parameters, and also provide accurate load sharing, and inhibit circulating current effectively. This paper provides a new strategy for using conventional droop control in middle-voltage and low-voltage network.

关 键 词：微网 下垂控制 虚拟阻抗 配比原则 小信号模型 

分 类 号：TM727[电气工程—电力系统及自动化]