王峰, 刘天琪, 由新红, 苏国强, 刘洋, 刘合金. 基于暂态直流电流预测的换相失败临界电压瞬时值判据[J]. 高电压技术, 2021, 47(1): 129-137. DOI: 10.13336/j.1003-6520.hve.20191976
引用本文: 王峰, 刘天琪, 由新红, 苏国强, 刘洋, 刘合金. 基于暂态直流电流预测的换相失败临界电压瞬时值判据[J]. 高电压技术, 2021, 47(1): 129-137. DOI: 10.13336/j.1003-6520.hve.20191976
WANG Feng, LIU Tianqi, YOU Xinhong, SU Guoqiang, LIU Yang, LIU Hejin. Critical Instantaneous Voltage of Commutation Failure Based on Transient DC Current Prediction[J]. High Voltage Engineering, 2021, 47(1): 129-137. DOI: 10.13336/j.1003-6520.hve.20191976
Citation: WANG Feng, LIU Tianqi, YOU Xinhong, SU Guoqiang, LIU Yang, LIU Hejin. Critical Instantaneous Voltage of Commutation Failure Based on Transient DC Current Prediction[J]. High Voltage Engineering, 2021, 47(1): 129-137. DOI: 10.13336/j.1003-6520.hve.20191976

基于暂态直流电流预测的换相失败临界电压瞬时值判据

Critical Instantaneous Voltage of Commutation Failure Based on Transient DC Current Prediction

  • 摘要: 目前高压直流输电换相失败临界电压普遍采用稳态或准稳态判据,缺乏计及故障后直流电流响应特性的暂态判据。研究了直流线路平波电抗和对地电容等储能元件充放电效应对于直流电流的影响,建立了拉式空间下直流线路的等值模型,提出了交流系统对称故障下的直流电流暂态预测算法,并采用Stehfest算法进行拉式逆变换,得到故障过程中直流电流的时域表达式,从而推导出了换相失败临界电压瞬时值判据。不同运行参数下的仿真验证了所提直流预测算法及临界电压判据的准确性。

     

    Abstract: This paper aims to propose a method for judging the critical commutation failure voltage in accordance with the transient response characteristics of DC current. Firstly, the effects of DC line reactance and charging capacitance on DC current are studied. Secondly, A direct current transient prediction algorithm after fault of AC system is proposed based on an equivalent model of DC transmission lines under Laplace Space established in this paper. The inverse Laplace transformation method of Stehfest algorithm is used to get the time domain expression of the DC current in the fault process, and the criterion of the instantaneous voltage value of the commutation failure is derived. Simulation results under different operating parameters verify the correctness of the proposed DC prediction algorithm and the accuracy of the proposed criterion.

     

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