A single-ended fault location method for DC lines in bipolar MMC-HVDC system

被引：4
作者：
Yang, Yachao [1 ]
Huang, Chun [1 ]
机构：
[1] Hunan Univ, Coll Elect & Informat Engn, Changsha 410082, Hunan, Peoples R China
来源：
ELECTRICAL ENGINEERING | 2020年 / 102卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Fault location; Fault analysis; Modular multi-level converter; DC transmission line; Capacitor discharging;
D O I：
10.1007/s00202-020-00922-x
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Fault location of DC grid is one of the crucial techniques for safe and reliable operation of power systems. This paper presents a single-ended fault location method for DC lines in bipolar high-voltage direct current transmission based on modular multi-level converter (MMC-HVDC) system, which focuses on short-distance DC lines. Firstly, the fault path after tripping is considered to be equivalent to a two-order RLC series circuit, and the initial voltage of the fault path is provided by the residual voltage of MMC submodule capacitors. Then, the differential equation of the fault path is established in time domain. Finally, by sampling the voltage and current signal of single-end MMC submodule capacitor and the voltage signal of the MMC bridge arm inductor, the fault distance, as well as the fault resistance, is obtained. A bipolar MMC-HVDC model is built by PSCAD/EMTDC, and the proposed method is verified by MATLAB. The simulation results show that the proposed method can accurately locate the fault position and is almost immune to the fault resistance.
引用
收藏
页码：899 / 908
页数：10
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