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Novel Disturbance Blocking Criterion for Reliable Current Differential Protection of LCC-HVDC Lines
IEEE Transactions on Power Delivery ( IF 4.4 ) Pub Date : 2020-09-11 , DOI: 10.1109/tpwrd.2020.3023585
Hao Xiao , Shiduo Ren , Yinhong Li

The existing current differential protection has been designated as the backup protection for LCC-HVDC lines. However, its reliability is very limited under the dc line high-impedance faults. In this letter, the challenges of the existing current differential protection are firstly revealed to offer a basic background. These challenges are shown to be caused by the existing disturbance blocking criterion, which imposes the unnecessary long time-delay under the dc line high-impedance faults. Moreover, a novel disturbance blocking criterion is proposed to identify the concerned disturbances, which is realized by a combination detection of the ac faults and commutation failures in LCC inverters. Compared with the existing disturbance blocking criterion, the proposed criterion has no long time-delay even under the dc line high-impedance faults. This salient feature makes the concomitantly proposed current differential protection operate much more quickly under the dc line high-impedance faults, and thus much more reliable than the existing one. Finally, the simulation results based on an actual bipolar LCC-HVDC link using the PSCAD/EMTDC program validate the proposed criterion and protection.

中文翻译:

LCC-HVDC线路的可靠电流差动保护的新型干扰阻止准则

现有的电流差动保护已被指定为LCC-HVDC线路的备用保护。但是,在直流线路高阻抗故障下,其可靠性非常有限。在这封信中,首先揭示了现有电流差动保护所面临的挑战,为其提供了基本背景。这些挑战表明是由现有的干扰阻止准则引起的,该准则在直流线路高阻抗故障下施加了不必要的长时间延迟。此外,提出了一种新颖的干扰阻止准则来识别相关的干扰,这是通过对LCC逆变器中的交流故障和换向故障进行组合检测来实现的。与现有的干扰阻止准则相比,所提出的准则即使在直流线路高阻抗故障下也没有长时间延迟。这一显着特征使得伴随提出的电流差动保护在直流线路高阻抗故障下的运行速度更快,因此比现有的差动保护更加可靠。最后,使用PSCAD / EMTDC程序基于实际双极性LCC-HVDC链路的仿真结果验证了所提出的标准和保护。
更新日期:2020-09-11
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