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Reclosing current limiting for DC Line Faults in VSC-HVDC Systems

Journal of Modern Power Systems and Clean Energy 2022年第4期10卷 1040-1049页

作者： Shunliang Wang Junjie Zhou Ji Shu Tianqi Liu Junpeng Ma College of Electrical Engineering Sichuan UniversityChengdu 610065China

The problem of reclosing current limiting in voltage source converter based high-voltage direct current(VSCHVDC)systems is becoming more and more serious.A soft reclosing scheme for DC permanent faults is presented in this paper.Because the converter voltages of stations at both terminals of the disconnected faulty line may be different,the choice of which terminal to reclose first will affect the reclosing overcurrent.A method for selecting the terminal to reclose first is investigated to achieve a minimum peak overcurrent during the reclosing process.In order to ensure that the hybrid DC circuit breaker(HDCCB)adapts to the needs of the reclosing process better,the traditional HDCCB is improved by adding a soft reclosing module(SRM).The energy dissipated in the arresters is significantly reduced when using the improved HDCCB.The improved HDCCB will be able to reclose multiple times safely and thus increase the possibility of successful reclosing.Moreover,the recovery time after the HDCCB is successfully reclosed is very short with the improved HDCCB and its control principles.Simulation results show that this proposed scheme is capable of limiting the reclosing overcurrent when the fault still exists.

关键词： Soft reclosing current limiting voltage source converter based high-voltage direct current(VSC-HVDC) DC fault

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Design aspects of transmission voltage superconducting fault current limiters with YBCO tapes in China

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Superconductivity 2022年第4期4卷 51-61页

作者： Tao Ma Shaotao Dai Meng Song Jiamin Zhu Jing Zhang School of Electrical Engineering Beijing Jiaotong UniversityBeijing 100044China Guangdong Power Grid and the Joint Laboratory of Superconducting Power TechnologyChina Southern Power GridGuangzhou 510080China Shanghai Superconducting Technology Co. Ltd.Shanghai 201203China

The design progress of superconducting fault current limiter(SFCL)for transmission voltage is presented,with a focus on the results of recent key experiments that have led to a state‐of‐the‐art high‐voltage high‐capacity super‐conducting current limiting techniques:the resistive alternating current(AC)SFCL,saturated iron cores AC SFCL,and resistive direct current(DC)SFCL.The main driving factors for designing SFCL in these projects are the preparation of high‐performance superconducting materials,the development of large‐scale superconducting current limiting winding,system testing,and operation technology.Based on the authors’experience with both AC and DC SFCLs,this paper focuses on the main design aspects of resistive SFCL at transmission voltage.The relationship between the hot spot caused by the inhomogeneity of long superconducting tape and the overall parameter selection is presented.In addition,the thermal calculation based on the current limiting resistance and a real‐time current curve is also proposed for the parameter design of the current limiting winding.

关键词： Superconducting fault current limiter Resistive type YBCO tape current limiting Insulation Heat transfer

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