DC-link stability control for dual-source electric vehicles using an extended kalman filter

In this paper, an innovative control method for a hybrid source electric vehicle (EV) is presented. Since the usual and practical way to measure currents consists in using sensors based on Hall effect, we present a technique to significantly reduce the noise generated by these sensors. Firstly, the model to build such controller and the variables involved is discussed. Then, to have a stable system and a controller easy to setup, a method to solve the control problem using a linear-quadratic regulator (LQR) is proposed. An Extended Kalman Filter (EKF) that uses the sensors and the converter model is exploited to obtain almost noise-free currents. The LQR and the EKF are validated separately, using an overall model implemented in Matlab/Simulink. The results obtained reveal a good behaviour by the controllers and an almost noise-free environment after the addition of the EKF. Further, the global performance is also validated using a standard driving cycle.