Preventive actions for power system stability preservation

As deregulation occurs, power quality will be more important to electric utilities´ customers. Power quality problems are mainly devoted to maintaining the supply voltage within certain limits. We have developed a new approach to maintain a given voltage value in the load nodes and increase the region of existence of solution to power flow equations by optimal selection of contingency arming schemes actions. The actions include estimation of the minimum value of generator tripping and load shedding, determination of the necessary level of static VAr compensation, and choice of minimum values of admittance increase in controlled lines using FACTS