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Fault Analysis Method for Power Distribution Grid with PCS-based Distributed Energy Resources

  • Kim, Dong-Eok (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Cho, Namhun (KEPCO Research Institute, Korea Electric Power Corporation)
  • Received : 2016.07.18
  • Accepted : 2016.11.22
  • Published : 2017.03.01

Abstract

In this study, we propose a fault analysis method for a power distribution grid with PCS-based DERs. We first explain the characteristics of a PCS-based DER. According to the characteristics, the DER is considered as a current-controlled voltage source, which produces varying voltages within a certain limit so that currents equal to given references flowing from the DER to the grid (currents controlled). So, we introduce the symmetrical equivalent models in the form of varying voltage source for fault analysis and then, construct a convex optimization problem to solve the fault problem associated with the equivalent models and grid conditions. Thus, the proposed method enables to perform a proper fault analysis considering the characteristics of the DER, which are currents controlled, voltage limited, and unity power factor achievement. To verify the validity of the proposed method, we perform computer simulations with the proposed method and with MATLAB Simulink, and the results are compared.

Keywords

Fault analysis;Power conversion system;Distributed energy resources

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