Automatic system of synchronous connection of backup power supply source in power systems with motor load

We developed an automatic system of synchronous connection of a backup power supply source in power systems with synchronous and asynchronous motors in case of power loss from the main source. Here, we propose performing continuous monitoring of the instantaneous voltage values of the main and backup power sources and determining the angle between them. The time to send the command to turn the backup power switch on is determined on the basis of the results of approximating the dependence of the angle between the voltages of the main and backup power sources on time. The proposed algorithm can be used in microprocessor fast-acting automatic transfer switch devices to ensure acceptable levels of currents of stators and electromagnetic moments of electric motors in self-starting modes and to maintain a complex continuous technological process at industrial enterprises. The effectiveness of the developed automatic system of synchronous connection of a backup power supply source has been confirmed using mathematical modeling methods and laboratory tests at an experimental stand.