A Backstepping Control with Nonlinear Disturbance Observer for BDISO Converter

A novel application of Backstepping Control with Nonlinear Disturbance Observer to the bidirectional DC-DC converter (BDISO) is presented in this paper. By exploiting the inherent characteristics of the BDISO topology, distinct advantages are offered by the proposed control strategy over conventional approaches. The converter has a port for DC source input, a port for battery input, and an output port. The backstepping control is designed to quickly adjust the output voltage while minimizing overshoot and undershoot in different modes, such as boost, buck, and bidirectional modes. The simulation results confirm the effectiveness of the proposed control strategy with a nonlinear disturbance observer (NDO). Its performance is compared with that of the backstepping control with a disturbance observer (DO), and a traditionally well-tuned proportional-integral (PI) controller in the MATLAB/SIMULINK environment.