Grid-Following Inverters and Synchronous Condensers: A Grid-Forming Pair?: Preprint

Research output: Contribution to conferencePaper


As power systems across the globe continue to achieve higher instantaneous penetrations of power electronic converterinterfaced renewable sources, the stability of these power systems is challenged because of the removal of synchronous machines, from which stability is traditionally derived. Although technological solutions to these stability challenges are on the horizon, such as the use of grid-forming inverters, they are not yet widely applied to larger power systems, which presents operational challenges for power systems achieving these high instantaneous penetrations today. An interim solution using existing technologies is to pair synchronous condensers with grid-following inverters, which might prolong the stability of an operating power system while synchronous generators are turned off during periods of high renewable energy availability. This work examines the transient stability of such a solution using PSCAD simulations of a two-bus system coupled to a variedlength transmission line, with a synchronous condenser at one bus and a grid-following inverter with grid-support functionality at the other. The system is exposed to load step, balanced fault, and unbalanced fault perturbations. It was found that this simple system returned to a steady state for transmission line lengths up to 125 km after 10% load steps, or a variety of fault types.
Original languageAmerican English
Number of pages10
StatePublished - 2020
Event2020 Clemson University Power System Conference - Clemson, South Carolina
Duration: 10 Mar 202013 Mar 2020


Conference2020 Clemson University Power System Conference
CityClemson, South Carolina

Bibliographical note

See NREL/CP-5D00-77679 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-5D00-75848


  • grid-following inverters
  • inertia
  • synchronous condensers


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