New Transmission Line Capability Assessment Method in Emergency Control Tasks

Abstract

The control of the network static stability by the transmitted active power flow value is the main criterion for the admissibility of the current power system mode [1]. In connection with the increase in the number of high voltage and super high voltage lines in the last decade, the number of controlled cross-sections of the bulk network, those controlled by the centralized emergency control system (CECS), is increasing. Power flow calculation by the N-1 criterion in order to detect exceeding the maximum allowable power flow in the lines [2]–[4] becomes an increasingly costly computational procedure. In addition, an increase in the number of high and super high voltage lines increases the probability of stability loss outside the controlled sections. In connection with the foregoing, there is a need for a simple method that allows finding power system links that are close to the power transmission limit. Such a method would improve the efficiency of the CECS algorithms in power flow calculation by the N-1 criterion and would give the potential for control actions formulation in case of a threat of stability violation outside controlled sections.