Voltage collapse in electric power system

Some of the factors affecting the voltage stability of a electric power system are the loadings and transformer tap settings. In addition, different system parameters may also alter the proximity to the voltage collapse point. The authors present certain important observations on the voltage collapse phenomenon established through system studies on a sample EHV AC transmission network and a HVDC network. The authors bring out the effects of changing the transmission line and transformer tap and parameters in EHV AC network, different short circuit ratio of receiving end and sending end AC systems in HVDC network