H∞ robust controller design for regenerative braking control of electric vehicles

Aiming at energy dissipation problem caused by frequent starting and braking in electric vehicle, Based on the topology and detailed analysis of its driving and regenerative braking power circuit, the speed-current double closed loops control system was proposed, H_∞ controller is designed to guarantee the robustness of the closed-loop system under the presence of uncertainties, such as large variation of back electromotive force of propulsion motor, voltage of battery, state of road, and initial speed of vehicle. Experiment and Simulation results show that H_∞ controller is superior to traditional PID controller on disturbance attenuation, robustness, moreover, extending of mileage is about 1.8% to 2.6% when uses H_∞ controller.