A STUDY OF POWER SYSTEM SECURITY AND CONTINGENCY ANALYSIS

An important factor in the operation of a power system is the desire to maintain system security. System security involves practices suitably designed to keep the system operating when the components fail. An operationally “secure” power system is the one with low probability of system blackout or equipment damage. A secured system is one which has the ability to undergo a set of disturbances without getting into an emergency condition. In other word a normal operating condition of a power system is considered to be secured if there is neither any occurrence of over loading of any neither equipment nor transient instability due to a set of credible contingency. The secured condition satisfies not only the loading and operating constraints but a third set of constraints known as the security constraints. In the modern days the power system is becoming wide and complex. Contingency Analysis (CA) is critical in power system analysis. This work reviews the techniques for contingency analysis based on line flow analysis. Contingency analysis is performed considering the line and generator outage contingencies, in order to identify the effect of an increase in loading to critical line and generator outages.