Evaluation of Multiple Inverter Volt-VAR Control Interactions with Realistic Grid Impedances

Sudipta Chakraborty, Anderson Hoke, Blake Lundstrom

Research output: Contribution to conferencePaperpeer-review

37 Scopus Citations


Integration of large numbers of distributed photovoltaic (PV) systems in electric distribution circuits often requires advanced functions (e.g. volt-VAR, frequency-Watt etc.). However, significant concerns have been raised about potential for PV inverters with such controls to interact with one another in a way that could cause grid instability. The lack of standardized inverter models makes it hard to simulate such transient interactions in software. Similarly it is very hard to test these dynamic inverter interactions in the laboratory. In this paper, unique Power Hardware-in-the-Loop (PHIL) techniques are presented to experimentally test for interactions of multiple PV inverters connected to multiple points-of-common-coupling (PCCs) with grid impedances between them. Sample test results are provided from simulation-only scenarios and PHIL testing. Though simulation results indicated possible harmful interactions between inverters' volt-VAR controllers; no such interactions were found in the limited hardware testing.

Original languageAmerican English
Number of pages5
StatePublished - 30 Sep 2015
Event2015 IEEE Power and Energy Society General Meeting - Denver, Colorado
Duration: 26 Jul 201530 Jul 2015


Conference2015 IEEE Power and Energy Society General Meeting
CityDenver, Colorado

Bibliographical note

Publisher Copyright:
© 2015 IEEE.

NREL Publication Number

  • NREL/CP-5D00-63795


  • interactions
  • inverters
  • Photovoltaic
  • power hardware-in-the-loop
  • volt-VAR control


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