考虑SOC平衡的并网微电网能量供需平衡方案

ENERGY SUPPLY AND DEMAND BALANCE SCHEME FOR GRIDCONNECTED MICROGRID COSIDERINGN SOC BALANCE

为实现并网微电网内分布式储能单元(distributed energy storage unit,DESU)的荷电状态(state-of-charge,SOC)平衡和能量的供需平衡,提出一种基于多代理系统(multi-agent system,MAS)的能量管理方案。该方案将每个微源和主电网各看作一个代理,风力机和光伏系统等不可控代理采用最大功率追踪(maximum power point tracking,MPPT)控制方案,DESU作为可控代理采用引入SOC平衡因子的PQ控制方案。通过调节DESU输出的有功功率可实现DESU的SOC平衡。该方案无需中央控制器或者全局通信,按照所提的功率输出方案便可实现微电网内能量的供需平衡,可降低系统的建设成本,具有良好的即插即用特性。最后,不同工况下的仿真结果验证了所提方案的有效性。

In order to achieve the supply and demand balance and SOC balance of DESU in the grid-connected microgrid,a multi-agent based energy management scheme is proposed in this paper.Each micro-source and the main grid is regarded as a agent in this scheme,the uncontrollable agents such as wind power and photovoltaic are works in point the maximum power tracking mode,and distributed energy storage unit as a controllable agent adopts PQ control scheme,which introducing SOC balance factor.The SOC balance is realized by regulating the output active power of the DESU.The scheme does not require central controller and global communication,energy supply and demand balance can be achieved according to the proposed power output scheme,and the construction cost of the system is reduced,the plug and play characteristics is good.Finally,the simulation results under different working conditions verify the effectiveness of the proposed scheme.