A Hierarchical Control Strategy for Microgrid Cluster Connection under Different Time Levels

Power deviation within the allowable range is a prerequisite for grid connection, operation cost is the target of power grid operation enterprises. To solve the contradiction between above is a hot research issue. In this paper, the appeal problem is solved by proposing a hierarchical control strategy for multi microgrid connections at different time levels, the microgrid coordination control system are divided into three parts: the local control controller, the microgrid central controller, and microgrid cluster central controller. The local control controller is used to control the real-time regulation of DG, energy storage and load; The microgrid central controller is used to control the frequency, voltage and power; The microgrid cluster central controller is to optimize the control of the whole microgrid system. This method can reduce the power deviation and reduce the operation cost, and effectively improve the rate of grid connection.