Ground Fault Overvoltage and Distributed Generation: Factors for Occurence

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In recent work performed by Pterra, the issue of ground fault overvoltage (GFOV) was raised in relation to integration of distributed generation (DG).  In particular, can inverter-based photovoltaic systems, connected in distribution feeders, induce GFOV on the high -side of the substation transformer?  And if so, under what conditions could this occur?  Pterra was engaged to conduct a research study by NYSERDA (the New York State Energy Research and Development Authority) to answer these very questions.  The resulting study and findings are documented and presented in the attached PowerPoint presentation.

Pterra ITWG – Phase I GFOV Study – 011717

For those who want to skip right to the answers: Yes, they can.  Subject to DG/load ratios, performance of surge arresters and interaction of inverter controls from different manufacturers.