基于虚拟感抗与变下垂系数的逆变器并联策略  

Parallel Strategy of Inverters Based on Virtual Inductive Reactance and Variable Droop Coefficient

作　　者：曹以龙 张举峰 江友华 赵乐 CAO Yi-long;ZHANG Ju-feng;JIANG You-hua;ZHAO Le(Shanghai University of Electric Power,Shanghai 200090,China;不详)

机构地区：[1]上海电力大学,电子与信息工程学院,上海200090 [2]国网上海市电力公司电力科学研究院,上海200437

出　　处：《电力电子技术》2023年第2期11-14,共4页Power Electronics

基　　金：上海市自然科学基金(21ZR1424800)。

摘　　要：低压孤岛微网中分布式电源(DG)并联运行时,往往存在功率耦合和线路阻抗不平衡等问题,导致传统下垂控制逆变器功率分配及环流抑制效果一般。对此,提出一种基于虚拟感抗与可变下垂系数的逆变器并联控制策略。通过引入虚拟感抗实现有功功率和无功功率的解耦控制,使逆变器适用下垂控制方程;利用低带宽通信进行在线监测无功分配控制,实现自适应调整下垂系数,以消除线路阻抗不平衡对无功分配的影响。实验表明该策略具有较强功率分配特性和环流抑制能力,无需线路阻抗参数信息,具有快速、实时和可靠等优势。When the distributed generation(DG) in the low-voltage island microgrid operates in parallel,there are often problems such as power coupling and line impedance imbalance,which lead to the poor effect of traditional droop control inverter power distribution and circulating current suppression.In this regard,a parallel control strategy of inverters based on virtual inductive reactance and variable droop coefficient is proposed.The decoupling control of active power and reactive power is realized by introducing virtual inductive reactance,so that the inverter can be applied to the droop control equation;the low-bandwidth communication is used for online monitoring and reactive power distribution control,and the droop coefficient can be adjusted adaptively,in order to eliminate the influence of line impedance imbalance on reactive power distribution.Experiments show that the strategy has strong power distribution characteristics and circulating current suppression capability,without the need for line impedance parameter information,and has the advantages of fast,real-time and reliable.

关 键 词：逆变器 虚拟感抗 变下垂系数 

分 类 号：TM464[电气工程—电器]