Operating conflicts for distributed generation on distribution systems

Distribution systems have been designed to optimize the delivery of power in one direction. The installation of distributed generation (DG) in significant capacity will result in some conflicts with the operation of the system. A selected set of conflicts is described. One conflict might result in changes to overcurrent device timing and reach that degrade reliability and power quality for other customers on the feeder. Interconnection requirements can increase the risk of equipment damage due to ferroresonant overvoltages. Transformer connections for DG involve a tradeoff between harmonic current injections, the risk of overvoltages, protective device coordination, and transformer life. The paper also addresses voltage regulation issues that often arise from the application of DG on distribution systems.