HONG Feng,WU Tonghua,ZHENG Yuping,et al.Adaptive Distance Protection Method for AC Lines Connected with Flexible DC Transmission System[J].Automation of Electric Power Systems,2023,47(22):25-32.
HONG Feng,WU Tonghua,ZHENG Yuping,et al.Adaptive Distance Protection Method for AC Lines Connected with Flexible DC Transmission System[J].Automation of Electric Power Systems,2023,47(22):25-32. DOI: 10.7500/AEPS20230228005.
Adaptive Distance Protection Method for AC Lines Connected with Flexible DC Transmission System
The integration of flexible DC systems significantly changes fault characteristics of the power grid
and there is a risk of incorrect operation when the traditional distance protection is applied to AC lines connected with flexible DC transmission system. Aiming at this problem
the rules are pointed out that the operation characteristics of the distance protection based on positive-sequence voltage polarization are affected by the control strategy of the flexible DC system
and the mechanism of refusal or malfunction when a phase-to-phase fault occurs at the near end of the flexible DC system or behind the power grid side is clarified. On this basis
an adaptive distance protection method combining transient information is proposed
which utilizes the time-domain information of the natural response stage at the initial fault instant to construct a fast direction discrimination element. Then
combined with the direction discrimination results
the range of distance protection operation is adaptively adjusted to ensure the correct operation of the distance protection. The results of real-time digital simulation (RTDS) experiments verify the effectiveness of the proposed method.
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