Voltage Regulation in Electric Networks Using Battery Energy Storage System

With the increasing penetration of Distributed Generation (DG), concerns related to voltage regulation in electrical grids arise. This work presents a control strategy to command the injection of reactive power in distribution grids, performing voltage regulation through battery energy storage systems (BESS). Droop control strategy was chosen, seeking to meet the need to provide reactive power to control the voltage at the connection point. Computer simulations are carried out using the PLECS software, for the development of the control strategy and to verify the behavior of the system under analysis. A 2 MW BESS is considered for the study, connected to an IEEE three-phase test network, which has 13 buses interconnected through distribution lines and unbalanced loads. Experimental tests were carried out using a prototype of a 12 kW BESS connected to a grid emulator, which emulates the grid impedance, thus, emulating the grid voltage variation according to the power flow.