ANALYSIS OF TRANSIENT AND STEADY-STATE MODES IN THE POWER SUPPLY SYSTEM OF ELECTRIC VEHICLES, WHICH CONTAINS A BATTERY AND SUPERCAPACITORS CONNECTED IN PARALLEL

The paper analyzes transient and steady-state processes under the condition of pulse-width regulation of modes in the power supply system of an electric transport device (ETD) containing a battery and parallel-connected supercapacitors. Numerical experiments were carried out on a mathematical model of the electrical equivalent circuit of such a power supply system using the Matlab Simulink application software package. The dependences of the current values in the electrical circuits of the battery, supercapacitors and load on the frequency of pulse currents, their relative pulse duration, as well as the parameters of the battery and supercapacitors were determined. It has been established that the use of supercapacitors, which have a much lower internal resistance compared to the internal resistance of the battery, makes it possible to significantly reduce pulse currents in the electrical circuit of the battery of an ETD due to the operation of the integrated power system, in which the currents in the electrical discharge circuit of the supercapacitors will be much greater than the currents in the battery circuit. References 12, figures 6, tables 3.