A DC Voltage Robust Control Strategy of Boost Converter Based on Load Impedance and Input Voltage Observation

The output voltage of the boost converter is often compromised by unpredictable load and uncertain input voltage disturbance, making the stable control of the output voltage problematic. To address this issue, a dc voltage robust control strategy of the boost converter is proposed with considering system disturbance. First, based on the dynamic model of the boost converter, a Luenberger observer is proposed to estimate the load impedance and input voltage. Subsequently, the nonlinear model of the boost converter is transformed into a linear Brunovsky form by using the feedback linearization method, and a single-loop sliding mode controller is designed based on the system energy function. Since the proposed observer can update the system disturbances for the controller in time, the robustness and dynamic performance of the boost converter are significantly improved. Finally, the effectiveness of the proposed control strategy is verified by simulation and experiment.