Reliability evaluation of high voltage direct current transmission protection system based on interval analytic hierarchy process and interval entropy method mixed weighting

Abstract

As the core of the secondary part of the high voltage direct current transmission (hereinafter referred to as HVDC) transmission system, HVDC protection is the first line of defense for the safe and reliable operation of the HVDC transmission system. Its reliability directly determines the safety of the HVDC transmission equipment and the stable operation of the power grid. Therefore, it is necessary to evaluate the reliability of the HVDC protection system. Based on the operating data of the converter station, this paper puts forward relevant evaluation indicators, and uses the mixed weighting method of interval analytic hierarchy process and interval entropy weight method to evaluate the converter station’s HVDC protection system and protection equipment. The evaluation results qualitatively and quantitatively judge the operating status of the equipment and verify the effectiveness and feasibility of the method. Using this method can scientifically and reasonably evaluate and analyze the operation of the HVDC protection system and various equipment, and judge the operation status of various equipment. This method can provide important guidance for the selection of new station equipment, the operation, maintenance, and overhaul of the HVDC transmission protection system of the converter station.