Design Method Considering the Frequency Band of the Disturbance in the DC Link Voltage Control System of Hybrid Electric Vehicle Driving Systems

Abstract

DC link voltage variable systems with DC/DC converter are used in hybrid electric vehicles for improving the power of the system by boosting the DC link voltage. Voltage feedback control using only proportional compensator has been proposed as a control method for the DC/DC converter. The control system can be easily designed, but there is a possibility that a steady-state error occurs in the DC link voltage. In this paper, a proportional integral compensator is proposed to eliminate the steady-state error of the DC link voltage in DC link voltage feedback controllers. In addition, when designing the gain of the compensator, the frequency band of the disturbance is considered. The proposed method is verified through experiments on the downsizing model.