Multi-rate Optimal Control for Bidirectional DC-DC Converter of EV Charger
In this paper, we propose the optimal control method for bidirectional DC-DC power converter for electric vehicles based on a multi-rate state estimation. The proposed multi-rate optimal controller has two parts, the fast-rate discrete Kalman filter and the optimal controller. The Kalman filter observes all states with respect to the fast sampling time based on the discrete model from a slowly measured output from current sensor. The optimal control law is determined by linear quadratic optimization for the discrete time system, using lifting operator. The proposed control method shows the improved performance by the fast-rate actuation despite of the slow-rate sensing. The numerical simulation shows the effectiveness of the proposed control method.
Index Terms - Multi-rate Control, DC-DC Converter, EV Charger, Kalman Filter