Применение многофазного широтно-импульсного преобразователя с двумя накопителями электроэнергии в тяговом электроприводе электромобиля

Abstract

The scheme of simultaneous power supply of a DC machine from two energy storage devices (accumulator and supercapacitor batteries) with a multi-phase pulse-width converter is considered. It is shown that with such a solution, less capacity of the supercapacitor battery is required in comparison with circuits with an isolation diode between drives or with switching between them. The operation of the electric drive is modeled on a model that takes into account time and level sampling in the control system and pulse-width modulation of power switches. Timing diagrams of simulation results for various distribution of the armature current between drives are obtained. The possibility of using the energy of a supercapacitor battery over the entire acceleration interval to reduce losses in a battery with several times greater internal resistance compared to a supercapacitor battery is shown, as well as the ability to direct part of the energy to the battery during regenerative braking so that it can provide during braking on long descents energy recovery exceeds the value allowed for storage in a supercapacitor battery. The obtained time diagrams confirmed the adequacy of the computer model and the stability of the traction electric drive while simultaneously powered by two electric drives. The advantage of this circuit is indicated to ensure a decrease in the ripple current of the armature and storages caused by pulse-width modulation, which reduces the loss in them and the minimum required value of the capacitance of the capacitors in the pulse-width converter.