SHORT TERM VOLTAGE STABILTY ANALYSIS OF AN AGGREGATED INDUSTRIAL LOAD

Abstract

Environmental constraints have limited expansion of transmission line networks. And with power systems being operated close to their security limits, the likelihood of voltage collapses occurring has increased. In most industries, the induction motor forms about 50% of the total electric load and this call for a thorough analysis of their effects on the whole power system. After a disturbance, stalling can occur if the electrical torque does not overcome the mechanical load, causing further voltage drop and eventually voltage collapse. An aggregate motor model is simulated in MATLAB-SIMULINK. If a three phase fault is not cleared in time, the motor will decelerate continuously and eventually stall.