Design of a wavelet multiresolution controller for a fuel cell powered motor drive system

A multiresolution wavelet-based controller for regulating the DC-link voltage of a fuel cell powered electric drive system is presented in this work. The system consists of a PEM fuel cell stack, an interleaved boost converter and an inverter driving a brushless DC motor. Control of the DC bus voltage is critical owing to the strong dependence of the voltage produced by the PEM fuel cell from load variations. Using a wavelet based controller gives the advantage of good control dynamics, while, due to the nature of the controller, the use of a filter in the measured output is avoided. Simulation results show that the proposed controller has fast transient response and satisfactory operation under steady state conditions.