微网用分布式电源变流器下垂特性控制策略  

A Voltage and Frequency Droop Control Method for Microsources

作　　者：黄杏[1] 金新民[1] 

机构地区：[1]北京交通大学电气工程学院,北京100044

出　　处：《电工技术学报》2012年第8期93-100,共8页Transactions of China Electrotechnical Society

摘　　要：分析了微网用分布式电源变流器的工作原理和基于基波电压的等效模型,提出了一种新的微网用分布式电源变流器控制策略。其中基于电压源输出特性的内环电压矢量控制策略,实现了变流器从并网状态到离网状态的无缝切换;基于下垂特性的外环功率控制策略,保证了微网内多台分布式电源变流器的无互联信号线并联应用;基于平移下垂特性曲线的电网二次同步控制策略,实现了变流器离网状态到并网状态的无缝切换。本文对所提出的这一控制策略进行了详细的理论分析,并利用多台容量为25kVA的微网用分布式电源变流器组成的微网系统实验电路,通过实验结果验证了这一控制策略的可行性。The working principle of the microsource inverter is analyzed and the corresponding circuit model base on the fundamental component is provided in this paper.A new microsource control method is shown in this paper,its inner loop uses output voltage vector control which makes the inverter work as a voltage source,and be able to switch from grid-connected mode to islanding mode without restart process,its outer loop uses output power control with droop characteristics,which can realize the multi microsources to be paralleled without high speed communication;and by moving the droop characteristics of the microsources,the microsource inverter can realize the resynchronization with the grid,which means the seamless transition from islanding mode to grid-connected mode.Detailed analysis is shown in this paper,and experimentations on two 25kVA three phase inverters were finished to prove the performances of this control method.

关 键 词：微网用分布式电源 下垂特性 无缝切换 微网控制系统 

分 类 号：TM464[电气工程—电器]