Experimental Determination of PV Inverter Response to Grid Phase Shift Events

Barry Mather, Oluwafemi Aworo

Research output: Contribution to conferencePaperpeer-review


With the continued growth of renewable energy resources which interface to the electric grid via inverters, the understanding of such devices becomes ever more important to the safe and reliable operation of the bulk power system. This work investigates the specific response of a utility-scale PV inverter to grid voltage phase shift-type disturbances which sometimes occur during grid fault events. The role of the PV inverter's phase-locked-loop (PLL) is identified as important to modeling the response. Switching-level simulations of a utility-scale PV inverter with a modeled PLL show a characteristic response when phase shift disturbances require the PLL to track what appear as fast frequency changes. Additionally, in this work a full-scale laboratory testing was carried out using the Opal real time (RT) OP5142 real time simulator and a large grid simulator to create phase shift disturbances with a high degree of repeatability. A photovoltaic (PV) inverter was connected to a grid simulator, and phase shifts were instantaneously implemented on the simulated grid, the results of the currents were then obtained. The experimental results obtained were validated with simulation results obtained from MATLAB/Simulink.

Original languageAmerican English
Number of pages5
StatePublished - 21 Dec 2018
Event2018 IEEE Power and Energy Society General Meeting, PESGM 2018 - Portland, United States
Duration: 5 Aug 201810 Aug 2018


Conference2018 IEEE Power and Energy Society General Meeting, PESGM 2018
Country/TerritoryUnited States

Bibliographical note

See NREL/CP-5D00-70496 for preprint

NREL Publication Number

  • NREL/CP-5D00-74635


  • DER
  • Frequency response
  • Harmonics
  • Inverter
  • Phase-locked loops
  • Photovoltaics


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