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MMC-HVDC电网输电线路双极短路故障电流的实用计算
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1.北京交通大学电气工程学院 北京市;2.南京南瑞继保电气有限公司

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国家重点研发计划


Practical Calculation for Pole-to-Pole Short-circuit Fault Current of Transmission Line in MMC-HVDC Grid
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School of Electrical Engineering,Beijing JiaoTong University

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    摘要:

    柔性直流电网作为支撑高比例可再生能源接纳的有效手段,已经成为电网发展的重要方向。双极短路故障是直流线路发生的最严重故障,目前一般通过在s域内列写直流系统状态方程,然后再基于拉式反变换求解故障电流,亟待提出短路电流的工程实用计算方法。为此,以张北柔性直流电网为研究对象,首先分析了直流线路双极短路的故障特性及耦合机理。在此基础上, 将故障线路靠近阀侧的两端分别看做二端口,分析了故障电流与二端口两侧电压的关系。其次基于正、负极线路二端口电压变化不大的思想,将环形直流电网简化为两端网络或开式网络,得到故障线路电流的实用计算方法,不再需要求解高阶的拉氏反变换而直接得到故障电流。最后,通过与电磁暂态仿真结果的对比,验证了实用计算方法的可行性与高效性。

    Abstract:

    As an effective means to support the adoption of high proportion of renewable energy, MMC-HVDC has become an important direction of power grid development. The pole-to-pole fault is the most serious fault in transmission lines. At present, state equations of DC system are usually written in the s domain, and then fault currents are solved based on the Inverse Laplace Transformation,while a practical engineering calculation method for fault current is needed urgently. In this paper, Zhangbei MMC-HVDC grid is taken as the research object, the fault characteristics and coupling mechanism of DC polo-to-pole fault are analyzed firstly. On this basis, the two ends of the fault lines near the valve side are regarded as two-ports respectively, the relationship between the fault currents and the voltages of the two-ports are analyzed. Secondly, based on the idea that the voltage of the two ports of the positive and negative lines does not change much, the annular MMC-HVDC grid is simplified to a two-terminal system or an open system. The practical calculation method of fault line current is obtained to calculate fault current directly, while it is no longer necessary to solve the high order Inverse Laplace Transformation. Finally, the feasibility and efficiency of the practical calculation method are verified by comparing with the electromagnetic transient simulation results.

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郝亮亮,李伟杰,王卓雅,等.MMC-HVDC电网输电线路双极短路故障电流的实用计算[J].电力系统自动化. DOI:10.7500/AEPS20190729015.

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  • 收稿日期:2019-07-29
  • 最后修改日期:2020-01-14
  • 录用日期:2019-10-29
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