Starting Analysis of Squirrel Cage Induction Motors 1000 kW by Variable Frequency Drive in Power System, Case study: Tabriz Pump station

Abstract

In petroleum industrial systems, analysis of power systems should be considered to exploit system reliability and prevent change in process performance during starting in equipment such as induction motors and industrial pumps. Medium-voltage induction motors are essential electrical machines in the oil, petrochemical, and process industries; therefore, the study of induction motors is an integral part of the analysis of power system. These motors are directly fed from the power grid and are exploited afterward. The starting current of induction motors is 5 to 7 times greater than the nominal current at the moment of starting until it reaches the nominal torque. This starting current will result in the motors and transformer and voltage drop in users' appliances connected to the electric grid to the extent that it might even cause a shutdown in the grid or not start the motor. It will also directly impact the power quality of the power system. For this reason, the starting voltage drop should not exceed 15% of the terminal voltage. In this paper, the starting of squirrel cage induction motors 1000kW by variable frequency drive in Tabriz pump station has been analysed by the ETAP 19.0.1 software.