Fast Terminal Sliding Mode Control of DC–DC Boost Converters With Enhanced Disturbance Rejection

The power converter plays a crucial role in energy conversion systems, while advanced control algorithms can help stabilize the bus voltage and match the power demand. In this work, a novel fast terminal sliding mode control is proposed for boost converters to strengthen the disturbance rejection ability. First, a full-order sliding mode manifold is proposed to guarantee the finite-time convergence of system states, and an integral-type switching control law is proposed to deal with large disturbances. Second, the disturbance estimation method is used to identify the system uncertainties and theoretical analysis indicates that it can further enhance the robustness and reduce the chattering. Third, a parameter update mechanism is developed to calculate the model parameters at the current operating point, which contributes to improving the control performance and flexibility to different working conditions. Finally, simulation and experimental tests are conducted to verify the proposed method.