A novel protection scheme for inverter-dominated microgrid

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Abstract

Protecting an inverter-dominated microgrid is challenging for the traditional overcurrent protection scheme owing to the suppressed fault current from the inverter interfaced DGs (IIDGs). In this paper, a protection scheme based on the Discrete Wavelet Transform is developed in MATLAB/SIMULINK to detect the faults in the microgrid. The input voltage of the proposed scheme is first transformed into dq0 frame using the Park Transform. A filtering system based on the wavelet denoising approach is then implemented to reduce the sampling frequency and reject the switching noise generated by the inverters in the microgrid. The performance of the proposed scheme is evaluated in transient simulation by systematically applying different types of faults, including varied fault positions and impedances. Additionally, a high impedance arcing fault model is implemented to test the proposed protection scheme under nonlinear fault impedance conditions.
Original languageEnglish
Number of pages6
Publication statusPublished - 12 Mar 2020
EventThe 15th International Conference on Developments in Power System Protection - Liverpool, United Kingdom
Duration: 9 Mar 202012 Mar 2020
Conference number: 15th

Conference

ConferenceThe 15th International Conference on Developments in Power System Protection
Abbreviated titleDPSP 2020
CountryUnited Kingdom
CityLiverpool
Period9/03/2012/03/20

Keywords

  • protection scheme design
  • microgrid
  • Inverter

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