高压直流输电线路暂态保护分析与展望

现时高压直流输电线路保护广泛采用ABB或西门子保护方案和配置。通过对ABB和西门子行波保护动作特性仿真结果分析及运行经验表明,二者保护方案无法可靠、灵敏地切除高阻接地故障,且易受噪声等外界信号干扰。同时,对国内外直流线路暂态保护的新思想进行分析总结,提出了提高高压直流输电线路暂态保护抗过渡电阻能力及区内、区外故障暂态分析所必须解决的几个关键性问题,为日后高品质直流线路保护判据的提出提供研究方向。

Analysis and prospect on transient protection for HVDC transmission lines

Nowadays, most HVDC transmission lines use the protections developed by ABB or Siemens Company. The two traveling wave protections are simulated and their merits and drawbacks are summarized, which show that these protection schemes can not reliably and sensitively cut out the high impedance ground fault and be vulnerable to external noises interference. At the same time some new ideas about the transient protection of the DC line are introduced; at last several key issues that could advance the reliability and sensitivity of the transient protection for HVDC transmission line are proposed, which will provide a theoretical basis for raising high-quality DC line protection criteria.