LPV control for power source coordination - application to electric vehicles energy management systems

This paper presents an LPV/H-infinity control strategy applied to power source coordination on board of averagepower electric vehicles. The proposed approach concerns frequency separation of responses between three power sources in order to satisfy power demand of vehicle's electrical motor, taking into account that sources are expected to work within distinct frequency ranges. The three sources - fuel cell, battery and ultracapacitor - are connected in parallel to a common DC-bus which supplies the electrical motor. The idea is to use the weighting functions associated to the LPV/H-infinity controller to determine auxiliary power source behaviors - battery and ultracapacitor - and to minimize the variation of fuel cell current and the DC-bus voltage. As a result, DC-bus voltage is regulated at 150 V, while the fuel cell provides mean power to the electrical motor. MATLABR (R)/SimulinkR (R) numerical simulation is used to validate the proposed approach by using two driving scenarios, namely Normalized European Driving Cycle (NEDC) and the driving cycle proposed by IFSTTAR (Institut Francais des Sciences et Technologies des Transports, de l'Amenagement et des Reseaux).