Research on energy management system of hybrid electric vehicle based on permanent magnet synchronous motor

Abstract

Fuel cell is a promising electric vehicle power supply, but has disadvantages of poor dynamic performance and short service life. To solve the disadvantage, a method of hybrid power supply of fuel cell and super capacitor is adopted in the dynamic process, the super capacitor helps fuel cell enter the steady state. In this paper, the topology of the whole system is introduced, which use two DC/DC converters, one inverter and other subordinate devices. A ZVS-PWM-Unidirectional-DC/DC converter is used to realize the boost process of fuel cell. Interleaved-half-bridge-bidirectional DC/DC converter is used to realize power supply compensation of super capacitor and to realize recycle process of motor braking energy. DC bus is necessary because the inverter requires pulse current with SVPWM modulation method. The permanent magnet synchronous motor vector control strategy is adopted. In the strategy the inverter and the motor are integrated and controlled as a whole. The performance of the motor is satisfying for applications in the field of electric vehicles. Traditional cars lose a lot of energy in the process of braking. In order to increase energy utilization, regenerative braking energy is recycled by super capacitor. In this paper, a new energy control strategy for dual closed-loop dual power supply with filters is proposed. The feasibility of the system and the control strategy are verified by MATLAB simulation preliminarily.