In this paper, a high power, high step-up non-In fact, using a non-ideal model of a classical boost converter, isolated DC-DC converter for fuel cell application is designed. a maximal output voltage can be defined according to the load The studied converter is connected to a fuel cell stack which and the dissipative elements of the converter. Moreover, in generates electrical power of 30 kW under 55 V. The load is a order to have a sufficient dynamic response the duty ratio battery pack with maximal voltage amplitude of around 620 V. The proposed converter allows to stand-up the fuel cell voltage to cainin be a one []Te rped converter.i t the battery pack voltage with fuel cell undulation current lower obtaInig by a two level cascaded converter.than 1% of the nominal current. Simulation results are presented In order to limit the current input ripple, several methods in order to validate the proposed converter structure and the can be used. For classical structure, the current ripple can be evolution of the converter efficiency will be investigated. reduced by increasing the components commutation switching frequency or by increasing the inductance value. According to Index Terms -Fuel cell model, DC -DC converters, high the power level of our converter, these classical methods voltage step-up converters, interleaved structure, cascaded cannot be used. As a consequence we will present an structure.interleaving structure of two classical boosts. For any duty cycle of the converter, the optimal shift between the two
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