微网混合式孤岛检测及运行模式切换研究

Study on hybrid islanding detection and operation mode transition of microgrid

孤岛运行是微网稳定控制的核心内容,而非计划孤岛检测是微网在故障解列时转入稳定孤岛运行的前提条件。提出一种基于电压-相角下垂控制的混合式孤岛检测方法。结合被动式的过/欠频、过/欠压检测法和基于正反馈的主动式孤岛检测法,实时感知非计划孤岛。通过负荷调度,快速实现网内功率平衡,保证网内负荷的供电连续性。在Matlab/Simulink中搭建微网系统模型,通过多复杂工况对所提方法进行仿真验证。

In microgrid stability control,islanding operation is the core content,and unplanned islanding detection is a precondition for stable islanding operation of the microgrid during fault disassembly.A hybrid islanding detection method based on voltage-phase droop control is proposed in this paper.It combines passive over/under frequency,over/under voltage detection method and active islanding detection method which is based on positive feedback together.The unplanned islanding is perceived in real time.Through load scheduling,the power balance in the microgrid can be realized quickly.In addition,the power supply continuity of the load in the microgrid can be guaranteed.The model of microgrid system is built in Matlab/Simulink,and the proposed method is simulated and verified under multiple complex working conditions.