摘要
微电网中越来越多以电力电子装置为接口的分布式电源采用模拟同步发电机的下垂控制策略来实现并网和孤岛工况的运行及相互之间的切换。基于分布式电源下垂控制策略和传统电网自动准同期并列装置工作原理,分析了微电网系统准同期并网原理,将频率调节和相角调节进行了统一,提出了一种微电网系统准同期并网的改进简化方法。针对电网末端三相电压不平衡等实际工况,采用正负序角度之和实现通信的传输,降低了对通信实时性的要求,增加负序分量的同步环节。
In microgrid the droop control strategy is utilized by more and more distributed generations（DG）,which use power electronic devices for the grid connection,to implement the grid-connected operating mode and the islanded operating mode as well as the switching between the two operating modes.Based on the droop control strategy for DG and the working principle of traditional automatic quasi-synchronized grid-connection devices,the principle of quasi-synchronized grid-connection for microgrid is analyzed and the frequency regulation and phase angle regulation are unified,and then an improved and simplified method of quasi-synchronized grid-connection for microgrid is proposed.In allusion to actual operating conditions such as three-phase voltage imbalance in the end of power network and so on,the communication is implemented by the sum of positive and negative sequence phase angles to reduce the demand on real-time communication.By means of adding the synchronization link for negative sequence component,a quasi-synchronized grid-connection method for microgrid under weak operating mode of power grid is put forward,and the feasibility of this method is validated by simulation and experimental research.
出处
《电网技术》
EI
CSCD
北大核心
2014年第11期3071-3078,共8页
Power System Technology
基金
国家863高技术基金项目(2011AA05A306)~~
关键词
微电网
准同期
电网电压不平衡
正负序分量
micro-grid
quasi-synchronization
unbalanced grid voltage
positive and negative sequence components
