PROJECT TITLE :

A Directional Protection Scheme for HVDC Transmission Lines Based on Reactive Energy

ABSTRACT:

High-voltage direct-current (HVDC) transmission-line protection is turning into increasingly fascinating with the expanding worldwide popularity of HVDC technologies lately. This paper proposes a transmission-line backup protection scheme based on the integral of reactive power for HVDC systems. The directional characteristics of reactive power flow are theoretically analyzed for internal and external faults, and these characteristics are used to construct a directional protection theme. The Hilbert rework is adopted to calculate the reactive power, which ensures an eternal output of calculation results and improves the reliability of the protection. A bipolar 12-pulse HVDC check system based on the CIGRE benchmark is modeled using PSCAD/EMTDC, and extensive simulations of numerous fault things are conducted to test the effectiveness of the proposed theme. The simulation results show that the proposed protection theme properly identifies internal and external faults and performs well with different fault distances and fault resistances. Furthermore, the proposed protection is insensitive to the sampling frequency, creating it practical for future applications.