Single pole‐to‐ground fault location method for MMC‐HVDC system using active pulse. Issue 2 (16th October 2017)

• Record Type: Journal Article
• Authors: Bi, Tianshu; Wang, Shuai; Jia, Ke
• Is Part Of: IET generation, transmission & distribution. Volume 12:Issue 2(2018)
• Page Start: 272
• Page End: 278
• Publication Date: 2017-10-16
• Subjects: fault location -- HVDC power convertors -- voltage‐source convertors -- power overhead lines -- fault currents -- singular value decomposition; single pole‐to‐ground fault location method -- MMC‐HVDC system -- active pulse -- modular multilevel converter system -- China -- America -- Europe -- large‐capacity power transmission -- overhead lines -- pole‐to‐ground permanent fault -- fault current -- travelling wave pulses -- dichotomising recursion singular value decomposition -- transition resistance; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2017.0116
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : Modular multilevel converter HVDC (MMC‐HVDC) systems have been commissioned in China, America and Europe. With the demand of long‐distance and large‐capacity power transmission, the MMC‐HVDC systems using overhead lines get more attention. When a single pole‐to‐ground permanent fault occurs, the fault current is very small, therefore if the fault location is determined, the fault can be cleared and the HVDC system can revert to normal operation without interruption. MMC‐HVDC can quickly control the work state of sub‐modules (SMs), therefore, it is possible to generate travelling wave pulses propagating to the line by controlling SM, without the need of additional equipment. So in this study, a fault location method for MMC‐HVDC using active pulse is proposed. Meanwhile dichotomising recursion singular value decomposition is used to detect the arrival time of active pulse. The proposed method does not require additional equipment and the method is not influenced by transition resistance. And fault location can be repeated since the pulse can be sent repeatedly. Computer simulations are performed and the results show that the proposed method can locate the grounding point of MMC‐HVDC reliably and with increased accuracy relative to existing methods.