Reduced-order LPV controller for coordination of power sources within multi-source energy systems

In this paper an order-reduction approach for multi-variable LPV/Hinf controller ispresented and applied to design a power source coordination strategy within a multi-sourceenergy system. The energy system has three different kinds of power sources – fuel cell, batteryand supercapacitor – which compose the power supply system of an electric vehicle. All sourcesare paralleled together with their associated DC-DC converters on a common DC-link coupledto vehicle’s electrical motor and its converter. DC-link voltage must be regulated in spite ofload power variations corresponding the driving cycle. The reduced controller is found to havea special form that is consistent with the physical properties of the studied system. The ISTIAmethod (Poussot-Vassal and Vuillemin [2012]) is used here to reduce the order of the LPVcontroller. The MIMO LPV reduced controller is proved to ensure quadratic stability of theclosed-loop system. Besides, this controller could be implemented with smaller computationalburden. The nonlinear multi-source system is simulated in MATLAB/Simulink usingthe Normalized European Driving Cycle (NEDC) as load profile. Simulation shows goodperformance of the reduced-order LPV/Hinf controller to be used in power sharing strategy.