Decentralized control strategy to improve dynamic performance of micro-grid and reduce regional interactions using BESS in the presence of renewable energy resources

Battery energy storage systems (BESSs) have been recently used in power network specially micro-grids (MGs). These devices increase the self-sufficiency and improve the frequency oscillations caused by the intermittent nature of distributed generations (DGs) or load uncertainty. In this paper, to improve the dynamic performance of MG, a multi-term feedback signal has been proposed. The first term is relating to a constant power which can be injected or absorbed by the battery to supply the load and overcome the lack of power due to the intermittency of renewable energy resources. The second term is based on frequency deviation which regulates the MG frequency dynamically and compensates the low inertia of inverter based resources. In addition, the power variation of tie-line has been also considered to reduce the interaction between two parts of the MG. 3-bus and 13-bus test power systems have been studied to show the effectiveness of the proposed methods in reducing the overshoot as well as damping time of frequency under several events. To evaluate the stability of the system, the eigenvalue analysis based on small signal model has been investigated and finally, the simulation results verified the effectiveness of the proposed controller to enhance the dynamic performance of the MG.