This report presents a detailed analysis for evaluating the use of microgrids to improve reliability and develop islanding for critical infrastructure and services; in particular, from a utility-owned and operated feeder-level microgrid perspective. The report draws on an in-depth literature review of existing microgrid installations and practices supporting microgrid design and deployment. Microgrid design considerations are discussed, resulting in a clear understanding of the relationships between various components of microgrid systems including dynamic distribution grid infrastructure, AC and DC considerations, storage and distributed generation, and responsive load resources. An economic analysis is presented detailing the costs and benefits of microgrids, as well as an accompanying Excel-based microgrid cash flow modeling tool that stakeholders can utilize to test the financial viability of various microgrid designs under specific conditions. The report discusses the current state of the microgrid industry as a whole and recommends research, development and demonstration needs to advance the state of the art within the sector. Finally, the report concludes with specific findings and recommendations for utilities to develop effective microgrid strategies.
Microgrid, Thermal energy, Distributed energy resources, Distributed generation, Resiliency, Reliability, Utility distribution feeder microgrid, Renewable energy, Renewable integration, Remote electrification