Starting Induction Motor at Different Voltage Levels in the Electrical Power System

Induction motors have an important role in the industry for the production of objects. Induction motors found in industry generally have a large capacity. However, the existence of this induction motor can cause stability problems in the electric power system. The cause of this disturbance is the starting current of the induction motor which rapidly rises to 6 times its normal current. The purpose of this paper is to analyze the effect of starting large induction motors on the stability of the electric power system. When the large induction motor starts, it will cause a decrease in the bus voltage around the induction motor. In the stating condition, the motor absorbs a large amount of current in the electric power system. This starting current occurs not forever or only temporarily. The parameters on an induction motor that need to be analyzed when starting are the rotation speed, torque, power consumption and motor voltage at the terminal. In the method, the induction motor is operated at different voltage levels, namely low voltage 0.8 kV, medium voltage 30 kV and high voltage 75 kV. In addition, we also tried to operate an induction motor with a power capacity of 1 MVA. The results of each experiment were then analyzed.