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Title: Comparative Study of DC and AC Microgrids in Commercial Buildings Across Different Climates and Operating Profiles

Bosch has developed and demonstrated a novel direct current (DC) microgrid system that maximizes the efficiency of locally generated photovoltaic energy while offering high reliability, safety, redundancy, and reduced cost compared to equivalent alternating current (AC) systems. Several demonstration projects validating the system feasibility and expected efficiency gains have been completed and additional ones are in progress. This paper gives an overview of the Bosch DC microgrid system and presents key results from a large simulation study done to estimate the energy savings of the Bosch DC microgrid over conventional AC systems. The study examined the system performance in locations across the United States for several commercial building types and operating profiles. It found that the Bosch DC microgrid uses generated PV energy 6%-8% more efficiently than traditional AC systems.
Authors:
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Publication Date:
OSTI Identifier:
1225024
Report Number(s):
NREL/CP-5500-65136
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: 2015 IEEE First International Conference on DC Microgrids (ICDCM);Atlanta, Georgia;06/07/2015 - 06/01/2015; Related Information: Proceedings of the 2015 IEEE First International Conference on DC Microgrids (ICDCM), 7-10 June 2015, Atlanta, Georgia
Publisher:
Piscataway, NJ: Institute of Electrical and Electronics Engineers (IEEE)
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; DC; microgrids; energy efficiency; PV; LED