Active Fault Current Limiting Control for Half-Bridge MMC in HVDC Systems

Pengxiang Huang, Shahil Shah, Luigi Vanfretti

Research output: Contribution to conferencePaper

Abstract

DC faults of MMC can result in a significantly large fault current due to the discharge of submodule capacitors. The fault current not only risks damaging the MMC but also demands a considerable breaking capacity from the dc circuit breaker (DCCBs). This paper introduces two novel active fault current limiting methods (AFCLs), namely virtual impedance-based and energy control-based AFCL. The first method utilizes circulating current feedforward, which introduces a virtual arm impedance to suppress the rate of rise of the fault current. Meanwhile, the second method relies on the control of the internally stored energy of the MMC to automatically minimize the number of submodules that discharge during a dc-side fault. Therefore, both the dc-side current and the MMC arm current can be effectively suppressed after the occurrence of the fault. The proposed methods do not require fault detection and their response is proportional to the rate of rise in the fault current. Simulation case studies are presented to demonstrate the proposed methods.
Original languageAmerican English
Number of pages8
DOIs
StatePublished - 2023
Event2023 IEEE 24th Workshop on Control and Modeling for Power Electronics (COMPEL) - Ann Arbor, Michigan
Duration: 25 Jun 202328 Jun 2023

Conference

Conference2023 IEEE 24th Workshop on Control and Modeling for Power Electronics (COMPEL)
CityAnn Arbor, Michigan
Period25/06/2328/06/23

NREL Publication Number

  • NREL/CP-5D00-87042

Keywords

  • active current limiting control
  • dc fault
  • energy control
  • modular multilevel converter (MMC)
  • virtual impedance

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