Modelling of Short-Circuit Protection for A Residential Grid-Connected BESS

This research paper presents the power protection study on a grid-connected Battery Energy Storage System (BESS) in a typical Malaysia low-voltage (LV) residential network.The BESS model and control algorithm is developed in MATLAB/Simulink environment.The BESS model can charge and discharge its energy with an algorithm-controlled bidirectional AC/DC converter.The paper also presents two cases for BESS short circuit evaluation to investigate stability of internal and external systems of BESS.The protection level on BESS is also optimized by introducing a time-delay characteristics model to coordinate circuit breakers in compliance with standards outlined in IEEE Std 1375-1998, IEC/EN 60898-2, IEC/EN 60947-2, UL 1077, and CSA 22.2.No.235.The paper presents BESS system stability with and without overcurrent protection.As a conclusion, BESS was interrupted within stipulated time.In case of internal short circuit protection failure, a backup protection will act on isolating BESS from the grid provided