DEVICE AND PROCESS FOR OPTIMUM OPERATION OF A POWER CONVERTER CONNECTED TO A POWER SUPPLY

摘要

The invention concerns the avoidance of resonance effects in a power supply of unknown impedance when a power converter connected to the power supply is in operation. In order that, in the case of a locomotive powered by a power converter for instance, standing waves which change uncontrollably as the locomotive travels do not form in the power supply, a characteristic transfer function (e.g. the power-supply input impedance) is first continuously identified by electrical measurement and the use of Fourier transforms and this function simulated at least in the region of the maxima of the function by means of a virtual power supply made up of discrete resonant circuits. The variables of the power-supply model, e.g. the currents flowing in each of the resonant circuits, can be calculated from the identified power-supply parameters as a function of the power-converter switching times. By virtual variation of the switching times, the optimum pulse pattern for power-converter operation can be calculated, this pattern causing no resonance in the true power supply.