Distribution-Connected PV's Response to Voltage Sags at Transmission-Scale

Research output: Contribution to conferencePaper

13 Scopus Citations


The ever increasing amount of residential- and commercial-scale distribution-connected PV generation being installed and operated on the U.S.'s electric power system necessitates the use of increased fidelity representative distribution system models for transmission stability studies in order to ensure the continued safe and reliable operation of the grid. This paper describes a distribution model-based analysis that determines the amount of distribution-connected PV that trips off-line for a given voltage sag seen at the distribution circuit's substation. Such sags are what could potentially be experienced over a wide area of an interconnection during a transmission-level line fault. The results of this analysis show that the voltage diversity of the distribution system does cause different amounts of PV generation to be lost for differing severity of voltage sags. The variation of the response is most directly a function of the loading of the distribution system. At low load levels the inversion of the circuit's voltage profile results in considerable differences in the aggregated response of distribution-connected PV Less variation is seen in the response to specific PV deployment scenarios, unless pushed to extremes, and in the total amount of PV penetration attained. A simplified version of the combined CMPLDW and PVD1 models is compared to the results from the model-based analysis. Furthermore, the parameters of the simplified model are tuned to better match the determined response. The resulting tuning parameters do not match the expected physical model of the distribution system and PV systems and thus may indicate that another modeling approach would be warranted.
Original languageAmerican English
Number of pages6
StatePublished - 2016
Event2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC) - Portland, Oregon
Duration: 5 Jun 201610 Jun 2016


Conference2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)
CityPortland, Oregon

NREL Publication Number

  • NREL/CP-5D00-66507


  • composite load model
  • distribution-connected
  • grid impacts
  • grid integration
  • photovoltaic systems
  • PVD1
  • transmission stability


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