首页|Influence of Qinghai-Tibet HVDC Transmission System on AC Transmission Line Protections in Qinghai Power System
Influence of Qinghai-Tibet HVDC Transmission System on AC Transmission Line Protections in Qinghai Power System
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原文链接
NETL
NSTL
万方数据
维普
To analyze the influence of ±400 kV Qinghai-Tibet HVDC transmission system on transmissionline protections in Qinghai AC power system,a closed-loop simulation system was constructed by combing HyperSim system with HVDC control protection devices.Various faults on double-circuit 750 kV and multicircuit 330 kV AC transmission lines in Qinghai power system were simulated.The impedance characteristics and harmonic components at Qinghai side of Qing-Tibet DC transmission line were analyzed.The harmonic proportion in voltages and currents were studied for faults that took place at different locations near the DC system.The inflence of Qing-Tibet DC system on the directional components of protections,differential protections and distance protections of AC transmission lines was discussed and drew the conclusions that the DC sytem had little influence on differential protections,while had great inflence on directional components and distance protection.The conclusions can provide reference for studying the interaction between AC and DC systems.
NETL
NSTL
万方数据
维普
