HVDC Transmission Line Protection Scheme Based on DC Filter Peak Current

Abstract

High voltage direct current (HVDC) transmission is frequently employed as a means of linking asynchronous systems, as well as incorporating renewable energy sources into the power grid. Protection of HVDC transmission lines is critical to the safety and reliability of the power grid as it uses multiple HVDC transmission lines. However, the high short-circuit currents and low tolerance of power electronics to short-circuit currents pose new challenges to the protection of HVDC transmission lines. This paper proposes a novel protection scheme for High Voltage Direct Current (HVDC) transmission lines as a means of mitigating the associated challenges. The proposed protection scheme is grounded on the peak Current features of Direct Current (DC) filters. This paper conducts a theoretical analysis of the flow characteristics of DC filters subjected to both internal and external disturbances across consecutive disturbance periods. This throughput configuration is used as a fallback protection scheme to identify ground faults, the worst of all. The efficacy of the suggested safeguarding protocol was evaluated utilizing a 500 kV HVDC framework that was incorporated in PSCAD/EMTDC. The findings of The simulations conducted in this study suggest that The proposed protection scheme, delineated in this document, evinces a high degree of efficacy in detecting both internal and external faults; furthermore, it preserves insensitivity to variations in fault resistance levels and distance.