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Title: Characteristic investigation and control of a modular multilevel converter-based HVDC system under single-line-to-ground fault conditions

This paper presents the analysis and control of a multilevel modular converter (MMC)-based HVDC transmission system under three possible single-line-to-ground fault conditions, with special focus on the investigation of their different fault characteristics. Considering positive-, negative-, and zero-sequence components in both arm voltages and currents, the generalized instantaneous power of a phase unit is derived theoretically according to the equivalent circuit model of the MMC under unbalanced conditions. Based on this model, a novel double-line frequency dc-voltage ripple suppression control is proposed. This controller, together with the negative-and zero-sequence current control, could enhance the overall fault-tolerant capability of the HVDC system without additional cost. To further improve the fault-tolerant capability, the operation performance of the HVDC system with and without single-phase switching is discussed and compared in detail. Lastly, simulation results from a three-phase MMC-HVDC system generated with MATLAB/Simulink are provided to support the theoretical analysis and proposed control schemes.
 [1] ;  [1] ;  [1] ;  [2] ;  [3] ;  [3]
  1. The Univ. of Tennessee, Knoxville, TN (United States)
  2. Harbin Institute of Technology, Harbin (China)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
OSTI Identifier:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
IEEE Transactions on Power Electronics
Additional Journal Information:
Journal Volume: 30; Journal Issue: 1; Journal ID: ISSN 0885-8993
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
Country of Publication:
United States
24 POWER TRANSMISSION AND DISTRIBUTION high-voltage direct-current (HVDC); modular multilevel converter (MMC); single-line-to-ground (SLG) fault; voltage control; HVDC transmission; current control; circuit faults; frequency control; reactive power; converters