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LIU Yulin,QI Jingjing,LI Jianing,MA Wenzhong.Diagnosis and Location Method for Open-circuit Fault in MMC Sub-module Based on Bridge Arm Current Distortion and Adaptive Observation[J].JOURNAL OF POWER SUPPLY,2020,18(3):106-115
Diagnosis and Location Method for Open-circuit Fault in MMC Sub-module Based on Bridge Arm Current Distortion and Adaptive Observation
Received:December 22, 2018  Revised:March 07, 2019
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DOI:10.13234/j.issn.2095-2805.2020.3.106
Keywords:modular multilevel converter  fault diagnosis and location  adaptive observer  sub-module  open-circuit fault
Fund Project:Project supported by Natural Science Foundation of Shandong Province (ZR2010EM011);Project Supported by National Natural Science Foundation of China(51277183)
           
AuthorInstitutionEmail
LIU Yulin Shengli Oilfield Administrator Center, SINOPEC, Dongying , China
QI Jingjing Shengli Oilfield Technology Inspection Center, SINOPEC, Dongying , China
LI Jianing Shengli Oilfield Technology Inspection Center, SINOPEC, Dongying , China
MA Wenzhong College of Information and Control Engineering, China University of Petroleum, Dongying , China
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Abstract:
      A modular multilevel converter(MMC) consists of a large number of sub-modules, which increases the pro-bability of system fault. Therefore, the rapid diagnosis and accurate location of sub-module fault is the key to ensuring the continuous operation of the converter. Aimed at the open-circuit fault of MMC sub-modules, a fault diagnosis and location method based on bridge arm current distortion and adaptive observation is proposed. By extracting the characteristics of the bridge arm current after fault, the damaged bridge arm and the type of open-circuit fault are determined. Afterwards, the residual between the estimated and actual values of sub-module capacitor voltage is obtained by utilizing the adaptive observer, so that the faulty sub-module can be located rapidly and accurately. A simulation platform of MMC is built using software Matlab/Simulink, and the correctness and effectiveness of the proposed fault diagnosis and location method are verified by simulations of fault of different phases, different bridge arms, and different types.
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