一种含光伏电源的微电网系统能量管理策略

An Energy Control Strategy for the Microgrid With PV Power Supply

旨在研究一种含光伏电源的微电网系统能量管理策略以实现系统各部分的良好工况和各状态的平滑切换。所述的微电网系统包含四部分:光伏阵列、蓄电池储能系统、本地交流负载和市电网。各部分均通过电力电子变换器与直流母线连接。针对此结构,提出了一种适用于当前国内电网环境和光伏应用的控制目标,进而提出了一种基于直流母线电压的能量管理控制算法。此算法根据直流母线电压设定各变换器的输出指令或限值,从而实现系统工作状态的切换。该方法省去了各部分之间的通信系统,使整个系统具有高可靠、易扩展的优点。仿真结果验证了所提出方法的有效性。

This paper focuses on the energy management strategy of a microgrid system.The microgrid consists of pho- tovoltaic array,storage battery system,local AC load and utility grid.Each part is connected to a DC bus by a power electronic converter.Based on the topology, an energy control target is brought up for the national grid environment and photovoltaic applications.An energy control strategy based on the DC bus voltage is also put forward to realize the tar- get.The main idea is to change the working condition of the microgrid by changing the command value or the thresh- old value of each converter according to the DC bus voltage.Communication system is avoided by this strategy, making the whole system highly reliable and can be extended easily.Simulation results verify the validity of the strategy.