一种四端口能量路由器的协同控制策略研究

A COLLABORATIVE CONTROL STRATEGY OF FOUR-PORT ENERGY ROUTER

针对研究的四端口能量路由器,首先分析能量路由器拓扑结构,根据能量路由器的功能需求提出各端口的控制方法。电网单元端口为T型三电平拓扑结构,采用电流闭环矢量控制实现直流母线的稳压控制;交流源单元端口为VSR拓扑结构,采用PQ控制实现交流源单元功率的灵活调节;光伏单元端口为Boost电路,采用最大功率点追踪(MPPT)和直流母线恒压控制(CVC)相结合的控制策略;储能单元端口为级联Buck-Boost电路,采用恒流控制。由此,提出一种四端口的协同控制策略,根据能量路由器接入的分布式能源与储能单元荷电状态(SOC)划分能量路由器的工作模态,再通过直流母线电压的波动、储能单元SOC等状态数据实现模态的切换。最后,通过MATLAB软件搭建仿真平台,验证能量路由器模态切换的可行性。

Aiming at the four-port energy router studied,the topology of the energy router is analyzed,then the control method of each port is proposed according to the functional requirements of system.The power grid port consists of a T-type three-level topological structure.The current closed-loop vector control is adopted to realize the voltage control of the DC bus.The port of AC source port consists of VSR topology,and the power of AC source unit can be adjusted flexibly by PQ control.The photovoltaic cell port consists of boost circuit,which adopts the control strategy of maximum power point tracking(MPPT)and constant voltage control(CVC).The energy storage port consists of cascaded Buck-Boost circuit,which adopts constant current control.Thus,a four-port collaborative control strategy is proposed,which is divided into multi-working modes according to the state of distributed energy.The working modes are switching by the DC-bus voltage fluctuation,the SOC of energy storage unit and other state data.Finally,a simulation model of energy router is built based on Matlab to verify the feasibility of modal switching.