交直流混合多端口能量路由器拓扑与控制研究

Research on Topology and Control of AC/DC Hybrid Multiport Energy Router

为了提高可再生能源与电网的互联,提出了应用于高压配电网的交直流混合多端口能量路由器模型。分析了级联H桥高压侧整流器、中间级DC/DC隔离器、低压交和直流端口的原理并提出了一种分布式控制策略,以直流母线电压的变化调整内部功率实时平衡。提出的能量路由器可以灵活提供不同电压等级的交/直流端口以供负载接入,在实现电压隔离变换的同时能够有效治理电网电压畸变。最后通过仿真验证了所提策略的正确有效性。

For the purpose of improving interconnection between renewable energy and the power grid,a model was presented for the AC-DC hybrid multiport energy router applied to high-voltage distribution networks.The principles of the cascaded H-bridge high-voltage side rectifier,DC/DC isolator at the intermediate stage,and low-voltage AC and DC ports were analyzed,and a distributed control strategy was proposed to adjust real-time balance of internal power with the change of the DC bus voltage.The proposed energy router could flexibly provide AC/DC ports of different voltage levels for load access,so that grid voltage distortion could be controlled effectively while voltage isolation conversion was realized.Finally,the correctness and validity of the proposed strategy was verified through simulation.