Real Time Simulation based on Software in the Loop of a Battery Energy Storage System Interconnected into the Electrical Networks

In this paper, a real time simulation based on software in the loop (SIL) of a battery energy storage system (BESS) integrated into the distribution electrical networks is presented. The BESS is used for the active and reactive power control, and as an interface between the battery bank, DC-link and voltage source converter (VSC), generating an independent control of the DC voltage and reactive power in the electrical networks. This system allows a bidirectional power flow, so that it can store energy when the generation exceeds the demand, but if the opposite occurs the energy is supplied. The effectiveness is assessed by complete mathematical modeling, the simulation results are evaluated using MATLAB-Simulink® (MATLAB r2018, MathWorks, Natick, MA, USA) and are validated with the real-time simulator Opal-RT Technologies® (Montreal, QC, Canada).