基于虚拟同步发电机控制的光/储/燃料电池微电网能量管理

Energy management of photovoltaic-storage-fuel cell microgrid based on virtual synchronous generator control

为提高微电网自主参与电网运行和管理的能力,提出一种基于虚拟同步发电机(VSG)控制的光/储/燃料电池微电网。针对逆变器VSG控制与前级分布式电源及附加储能单元的协调配合问题,以储能荷电状态(SOC)为依据,分别设计了光伏和燃料电池VSG的能量管理策略,使微电网响应电网需求参与一次调频且提供惯性的同时,实现了光伏发电的最大功率输出、燃料电池发电的燃料平衡调节以及储能单元SOC的安全可控。最后,利用MATLAB/Simulink软件搭建仿真模型,验证了所提能量管理方案能够实现VSG控制与分布式电源及储能的协调配合,在并/离网下都能保证微电网安全可靠运行。

To improve the ability of microgrid to participate in grid operation and management, a PV(PhotoVoltaic)-storage-fuel cell microgrid based on VSG(Virtual Synchronous Generator) control is proposed. In order to coordinate the VSG control of inverters with the distributed power supply and the additional energy storage unit, based on the SOC(State Of Charge) of energy storage, the energy management schemes of PV and fuel cell VSG are designed respectively, which enables microgrid to efficiently participate in primary frequency modulation and provide inertia in response to the demand of power grid. At the same time, the maximum power output of the photovoltaic power gene-ration, the fuel balance regulation of the fuel cell power generation, as well as the safety and controllability of SOC in energy storage unit are realized. Finally, simulative results on MATLAB/Simulink verify that the proposed energy management scheme effectively coordinates the VSG control with distributed generation and energy storage, and ensures safe and reliable operation of microgrid under both grid-connected and islanded conditions.