SHORT TERM VOLTAGE STABILTY ANALYSIS OF AN AGGREGATED INDUSTRIAL LOAD

Abstract

Environmental constraints have limited expansion of transmission line networks. And with power systemsbeing operated close to their security limits, the likelihood of voltage collapses occurring has increased. Inmost industries, the induction motor forms about 50% of the total electric load and this call for a thoroughanalysis of their effects on the whole power system. After a disturbance, stalling can occur if the electricaltorque 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, themotor will decelerate continuously and eventually stall.