Load Margin Assessment of Power Systems Using Chaotic Crow Search Algorithm

The load margin is an important index to evaluate the operating complexity of power systems. This index commonly uses static models of power systems and determines the load margin related to the voltage stability threshold. However, load growth also causes the emergence of oscillation modes with low damping ratios that can cause small-signal instability of power systems. This work proposes a method to determine the load margin considering the operating restrictions of voltage stability and small-signal stability studies. This proposed method is based on an optimization model and it is solved by a metaheuristic called Crow Search Algorithm with the theory of Chaotic functions. Case studies are presented and evaluated in the IEEE 39-bus system.