MPC-based frequency control strategy with a dynamic energy interaction scheme for the grid-connected microgrid system

In a microgrid system (MGS), effective frequency control strategies are extremely significant for maintaining the system frequency stabilization. Therefore, a model predicted control (MPC) method is presented to regulate the frequency fluctuation of the grid-connected microgrid system (GCMGS). The primary frequency control for the diesel generator (DG) and the secondary frequency control with the (MPC) for the energy storage (ES) are proposed in this paper. Simultaneously, in order to mitigate the power fluctuation caused by the load demand side and the renewable energy sources, a dynamic energy interaction scheme (DEIS) is designed. The power exchange between the MGS and utility grid can be achieved. Due to the randomness of the renewable energy sources, the system frequency is hard to remain stable. Thus, a constant constraint renewable energy sources power output is utilized to reduce the uncertainty of the renewable energy sources. Finally, several comparison experiments have been executed to illustrate the availability of the proposed control strategy. (c) 2019 The Franklin Institute. Published by Elsevier Ltd. All rights reserved.