The architecture for three tier community power systems, comprised of building based nanogrids, neighborhood based microgrids and full macrogrid connectivity and support will be presented. In regulated markets, it is anticipated that the incumbent utility will own the complete power system and manage it like any other system resource, recognizing all components, including rooftop solar are “in front of the meter”. In deregulated markets, the distribution system components would be owned by the incumbent distribution utility while ownership of the generation and storage would be flexible. A developer or an IPP could own these assets.
A typical community system is configured to provide 50 – 85% renewable energy, thus taking advantage of declining costs for solar and batteries, while integrating smoothly into the traditional distribution system in a manner that creates benefits for both consumers and utilities. The hybrid AC and DC system utilizes dc technology to move non-synchronous energy around the microgrid. This builds on the rapidly increasing adoption of DC devices: solar generation, batteries, LED lights, flat screen TVs and variable speed heating /cooling units. All energy can be converted to either AC or used natively as DC to service every load/home including EV charging.