摘要
为提高微网系统的性能,本文在已有的微网系统控制策略基础上,针对以下两点对其进行优化:一是微网用分布式电源输出功率限幅功能,用以抑制多台微网用分布式电源并联运行时,由于下垂特性不同而导致的微网用分布式电源过载或功率反向注入问题;二是微网系统离网状态向并网状态切换时,在微网系统二次调频控制的基础上添加频率扰动策略,用以缩短微网系统的频率调节时间,实现微网系统与电网的快速同步.本文对所提出的这一控制策略进行了分析,并利用4台容量为25 kVA的微网用分布式电源变流器和1台90 kVA可调模拟负荷组成微网系统实验电路,通过微网系统并网/离网无缝切换实验验证了这一控制策略的可行性.
In order to improve the performance of microgrid,two additional functions are provided in this paper,one is a power amplitude limitation function added to the AC microsource droop control method,which is used to protect the microsources from overload or power injunction when the droop control characteristics of the microsources are different,the other is a frequency disturbance function added to the AC microgrid system secondary regulation control method,which can minimize the adjustment time during microgrid resynchronization and realize a fast microgrid resynchronization to the utility.Detail experimental results on a microgrid platform with four 25 kVA three phase inverters and a 90 kVA adjustable three phase load are shown in this paper to verify the performance of this control method.
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2012年第5期7-13,共7页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
国家"863"高技术研究发展计划项目资助(2011AA05A306)
关键词
微网系统
微网用分布式电源
下垂特性
功率限幅
频率扰动
microgrid
microsource
droop characteristics
power amplitude limitation
frequency disturbance
