Advanced Control Techniques for Enhance the Power System Stability at OOS Condition

Amer Nasr A. Elghaffar, Ali M. Eltamaly, Yehia Sayed, Abu-Hashema M. Elsayed


The power system stability is the accurate operation of the electric grid by recovering a state of operating balance after being subjected to an abnormal condition such as faults, line switching, load rejection, and loss of excitation. Protective equipment’s in high voltage substations should be providing fast, reliable localizes faults and selectivity. But, some abnormal condition in the power system such as out-of-step (OOS) condition which the mechanical power for the generator not equalized with electrical power for the load which is not a real fault, but the protection equipment’s will consider this condition is a fault. This situation will cause the loss of synchronism between areas within the power system or between interconnected systems that's will lead to blackout for the national grid. This paper study the OOS condition, philosophy of protection relay device and how to overcome this condition by optimal method to avoid the false operation for distance function by Out of Step Blocking (OSB) to improve stability of power system by using the advanced protection relay.

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