Modified grid forming converter controller with fault ride through capability without PLL or current loop

Ahmed Abdelrahim, Paul McKeever, Michael Smailes, Agusti Egea-Àlvarez, Khaled Ahmed

Research output: Contribution to conferencePaperpeer-review

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The electrical power system is facing several challenges as the penetration of converter based renewable power increases, including a reduction of the synchronous based inertia, loss of converter synchronism and weakened grids. Grid forming converter controllers, especially the socalled Virtual Synchronous Machines (VSMs), are seen as a potential solution for some of these issues. VSM controllers mimic the behaviour of a synchronous machine to different degrees of detail. Of these implementations, those that do not use Phase Locked Loops (PLLs) or current loops have been shown to be advantageous. This paper presents several proposals for a Fault Ride Through controller for a VSM controlled converter without a PLL or vector current control loop, which are imposing limitations on the stability of the inverter in low Short Circuit Ratio grids. Also, a method to limit the power and voltage/reactive power references, considering the converter maximum current, is presented. This paper validates and shows the advantages and limitations for the proposed control structures through extensive simulations using MATLAB Simulink for different grid conditions applied to a wind turbine.
Original languageEnglish
Number of pages8
Publication statusPublished - 18 Oct 2019
Event18th Wind Integration Workshop - Dublin, Dublin, Ireland
Duration: 16 Oct 201918 Oct 2019


Conference18th Wind Integration Workshop
Internet address


  • virtual synchronous machine
  • fault ride through
  • current limitation
  • fault detection
  • voltage sags
  • symmetrical faults


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