多母线结构交直流混合微电网协调控制与模式切换策略

对于多母线结构的交直流混合微电网,实现多台变流器之间的协调控制以及不同运行模式的平滑切换是微电网运行控制的重点。文中首先以上虞交直流混合微电网示范工程为背景,详细介绍了该微电网系统的结构设计方案和各变流器设备的运行控制策略;其次,根据母线联络开关的通断状态,设计了4种交直流微电网典型运行模式,并重点阐述了包括计划性和非计划性切换在内的12种模式切换策略及实现逻辑。最后,结合现场实际运行结果对策略进行了验证。试验结果表明,文中所提的协调控制与模式切换策略能够实现系统均流、电压频率恢复和无缝切换等功能,有利于提高运行稳定性和供电可靠性,保证分布式电源的就地消纳。

Coordination Control and Mode Switching Strategy for Hybrid AC/DC Microgrid with Multi-bus Structure

For AC/DC hybrid microgrid with multi-bus structure, the realization of coordination control among multiple converters and smooth switching of different operation modes are the key points for microgrid control. Based on the Shangyu hybrid AC/DC microgrid demonstration project, this paper describes the structure design scheme and the converter control strategy of the microgrid. According to the state of interconnection switches, four typical AC/DC microgrid operation modes are designed, and twelve corresponding mode switching strategies and their implementation logic are described in detail, including planning and unplanned switching. Finally, the strategies are verified by actual operation results. The experimental results show that the proposed strategy can realize the function of power sharing, voltage/frequency recovery and seamless switching, and can improve the operational stability and the power supply reliability, while ensure the local consumption of distributed generation.