Advanced Feeder Design for Distributed Generation

Advanced distribution automation functions enable feeder design with high penetration levels of distributed generation, up to 75% of the feeder´s peak load. An example design is presented, based on an IEEE radial test feeder. The distributed generation in this example requires use of directional elements in the feeder relay, along with adaptive settings for line voltage regulators and capacitor switching controls. During implementation and testing planned for 2007 through 2010, devices compliant with IEC substation automation standards will be used for the feeder relays and DG interconnection relays. For the line voltage regulators and capacitor bank controllers, mappings were developed between a legacy DNP3 protocol and the IEC object model. For capacitor bank controllers, an extension of the IEC object model is proposed.