Reliable operation of large scale electric power networks requires that system voltages and currents stay within design limits. Operation beyond those limits can lead to equipment failures and blackouts. Security margins measure the amount by which system loads or power transfers can change before a security violation, such as an overloaded transmission line, is encountered. This thesis shows h...

Load shedding is generally regarded as the final option to evade voltage collapse and blackout following major overloads. The traditional method of load curtails random loads regardless their importance until system’s improved. Shedding without considering priority will lead power interruption in vital infrastructures. Hence, improve existing system protection scheme, development a more effecti...