一种新型混联模块化储能系统及其高效柔性电能路由策略OA北大核心CSTPCD

Access to renewable energy in distribution networks causes many problems such as inflexible operation modes,unbalanced loads,large disturbances in closed-loop operation,and limited capacity for renewable energy consumption.Currently,flexible and controllable topologies that can rapidly consume renewable energy are urgently required.This paper proposes a new modular AC/DC hybrid energy-storage system that has both distributed and centralized flexible power ports and is suitable for flexible interconnection applications in new power system distribution networks.The system adopts a modular design,with multiple types of terminals such as distributed power-generation units,energy-storage units,and critical loads connected to the medium-voltage DC link of the cascaded H-bridge unit.Each module is connected to the load bus through a high-frequency magnetic isolation channel,which configures the power generation and storage ports into a fully distributed structure.The AC side of each module is connected in series to achieve the power interaction with the three-phase medium-and high-voltage AC power grid,resulting in the formation of low-voltage DC,medium-voltage DC,medium-voltage DC,medium-voltage DC,and medium-voltage AC hybrid ports.In addition,a segmented energy management strategy is proposed to maintain stable system operation and achieve fully autonomous energy routing involving the AC grid,distributed generation,energy storage,and loads.The feasibility of the proposed modular AC-DC hybrid energy-storage architecture and its control strategy were verified using software simulation.