Ground Fault Overvoltage and Distributed Generation: Factors for Occurence
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 more »Read More
Interharmonics Case Study: Nuisance Tripping in a 200 MW Wind Farm
A 200 MW DFIG wind farm is experiencing nuisance tripping. These occur during switching of power factor correction cap banks comprising of 4x12 MVAR connected to the farm's 34.5 KV collector buses. Trip signals recorded by WTGs indicate power quality issues. Harmonic distortion study of the Project did not indicate potential violations. A more detailed analysis indicated presence of interharmo...
Approaches to Complying with NERC Standard PRC-019-2 on the “Coordination of Generating Unit or Plant Capabilities, Voltage Regulating Controls, and Protection”
The undesired outages of generating units during the July 1996 Outages in the Western Interconnection and the August 2003 blackout in the Eastern Interconnection have resulted in updates to reliability standards which secure, improve, and optimize generator response during power system disturbances. The North American Electric Reliability Corporation (NERC) has recently issued Standard PRC-019-2 w...