直流配电下多微网系统集群控制研究

Cluster Control Research of Multi-microgrids System Under DC Distribution System

构建高效、低耗、可靠的直流配电系统是实现直流型分布式电源与直流型负载灵活组网及供需互动的有效途径,是交流配电之外未来配网的重要发展方向。该文对直流配电下多个直流微网进行集群控制的典型特征和拓扑结构进行了阐述。在直流型分布式电源以直流多微网形式集群控制中,采用一种分散自律的控制架构,将每个直流微网以多分段P/U曲线进行描述,多个直流微网基于各自P/U曲线进行功率分散管理,同时基于变流器实现混合自律控制。基于PSCAD/EMTDC建立直流微网群对等互联仿真模型,通过设置不同运行场景,验证了多个直流微电网以集群的形式运行可提高低压区域的自治能力和能源利用效率,最大程度地适应高比例直流型分布式电源并网的动态特性。

The construction of an efficient, low consumption, reliable DC distribution system is an important way to achieve flexible access and efficient matching of DC power and DC load. This paper described the typical characteristics and topology of cluster control of multiple DC microgrids under DC power distribution. In order to realize system power decentralized management and self-discipline control, each DC microgrid was described by multi-segment P/U curve, and multi-microgrids system were used for power decentralized management based on their respective P/U curves. All the power management strategies were achieved by converter control. The simulation results verify the effectiveness of the proposed power management and control strategy.