A linear model for overload rerouting and testing switching measures for overload elimination by means of Relief Functions

Abstract

Eventually, limit violations may occur during power systems operation, such as: overloads in transmission lines and power transformers, voltages at buses outside admissible range, etc. Thus, it is important to create ways to maintain the supply of electrical energy even in contingency operation situations, with fast and lowcost measures, keeping load restriction as the last control action. Corrective Switching is a technique capable of controlling the power flow in meshed networks by changing the network topology. The main advantage of this control tool is that it does not involve additional costs, since its implementation depends on maneuvers of elements already present in the network. In previous works, several techniques and methodologies were developed to reduce the computational effort needed to implement the technique, aiming its application in real-time operation. This work presents a new linear methodology to simulate overloads rerouting without changing the admittance matrix, avoiding extra computational effort for new factorization. Furthermore, the parameters calculated by linearization are able to build a relief function to identify switching variants capable to reconfigure the network in real-time through the technique of Corrective Switching.