THE APPLICATION OF SUPERCAPACITOR ENERGY STORAGE DEVICES IN DC DRIVES

Abstract. The article looks on actual theme about improoving of energetic efficiency of exploitated DC traction drives. There are developed the separate schemes for DC motor starting and braking regimes by using the supercapacitor energy saving devices for motor armature shunting. The starting device allows to decrease the motor torque jerks at the beginning of transient process thus providing the elimination of consumed energy and drive system mechanical wear. There is given the saved energy calculating equivalent circuit and expression. By varying the subtitution scheme shunting and ballast resistance values, the mechanical time constant changes with increasing the speed of transient processes. The estimated DC motor control device with supercapacitor battery allows to eliminate the need for ballast resistor. The decreasing of consumed energy is achieved in such way because the electrodynamic braking has realized simultaneosly with shunting of DC motor armature with the help of capacitor energy saver which decreases the armature voltage to provide the stable boost converter operation. The braking scheme with two converters transfers the energy saved in the filter capacitor to the supercapacitor energy saver independently from the filter capacitor voltage oscillation value. The new device has higher efficiency factor. Key words: ballast resistor, DC motor, supercapacitor, transient processes