Design & Simulation of high gain ratio Bidirectional converter for energy storage applications

Uneven supply from the renewable energy systems leads to integrating of energy storage systems (ESSs) to a DC bus. Battery Banks is one of the types of ESSs. For integrating low-voltage battery banks to a high-voltage DC bus, a high boost ratio Bidirectional DC-DC (BDC) converter is required. Coupled Inductor Bidirectional DC-DC (CIBDC) Converter is a feasible and efficient solution for high gain conversion. Closed loop control is required to regulate the DC bus voltage during step-up mode and battery current during step-down mode. For achieving closed loop control, Proportional Integral (PI) controller is used in each mode. Simulation is carried out using MATLAB/Simulink for a load of 2kW and various waveforms of both modes are represented. The efficiency of the CIBDC Converter with varying load during boost mode and buck mode is graphically represented. With the use of Snubber circuit, the voltage spikes over the switches are clamped.