交直流混合微电网协同控制策略

Coordinative control strategy for hybrid AC-DC microgrid

为了保障交直流混合微电网供电可靠性与运行稳定性,基于改进直流母线分层思想,提出了一种综合协同控制的能量管理策略。根据直流侧直流母线电压变化,分别设计了并网和孤岛工况下微电网内微源的协同控制策略,其为无需通信线的分散控制,协调对光伏电池、储能电池、交直流接口变流器、直流负荷、交流负荷与大电网之间的控制。所提策略保障了分布式微源发电的充分利用与计划重要负荷的持续稳定供电,优化了储能电池能量利用。分析了微电网内控制器设计与微源能量分配方法。设计搭建了交直流混合微电网实验平台,实验验证了该协同控制的能量管理策略的可行性与正确性。

An energy management scheme with coordinative control strategy based on the layered DC bus voltage is proposed to guarantee the power supply reliability and operational stability of hybrid AC-DC microgrid. Coordinative control strategies of micro-source are designed for the grid-connected and islanded microgrids respectively,which is of the distributed control without communication lines to coordinate the control among its micro-sources according to the DC bus voltage variation,such as photovoltaic cell,storage battery,AC / DC converter,DC load,AC load and large grid. The proposed strategies make the full use of micro DGs,maintain the stable power-supply for critical loads and optimize the energy utilization of storage batteries. The design of microgrid controllers and the method of power distribution among micro-sources are analyzed. A test platform of hybrid AC-DC microgrid is built and the feasibility and correctness of the proposed strategies are verified by the experimental results.