Sharmila Ravula

28-Sep-2017, 3:00-3:30PM

Session: Implementing Resilient Infrastructure Solutions

Track A | Energy Security & Government Energy Management | FedEnergy Works

DC Building Grids: Optimization of Distributed Energy Resources

Sharmila Ravula
Bosch Building Grid Technologies

The electricity grid as we know it today is rapidly transforming. Soon the days of traditional grid planning will change and new energy markets and industries will form to create a new paradigm in the energy industry where resources will come from a mix of large centralized and local customer generation. This new foundation will rely heavily on customer’s integrating onsite generation and energy efficiency. This means customers will need to synchronize their distributed energy resources (DER) for the ability to not only reduce their energy consumption resulting in saving energy costs, but to also use it as a valuable resource for the electricity grid. As new technologies and controls are being developed and implemented to support this effort, there has also been a movement to redefine how this energy is generated and consumed. The use of direct current (DC) energy is becoming more prevalent as the industry is realizing that DC energy is more efficient and reliable as it removes the need for power conversion devices within a facility to transform energy to alternating current (AC) to power building loads. Buildings that implement a DC energy system are also capable of providing grid support as the majority of the energy being generated onsite is directly consumed by the facility, therefore, not causing load impacts to the grid and with the use of energy storage, additional support can be provided to the grid through demand response initiatives. The use of distributed energy resources in a DC system within a building can lower the cost of solar PV and energy storage ownership, improve building load efficiencies, and provides reliability and resiliency. This approach promotes the penetration of renewable energy and energy efficiency technologies to better serve emission reduction and zero net energy goals. Bosch has developed a novel DC microgrid system that synchronizes onsite distributed generation (solar PV and energy storage) directly to energy-efficient building loads (DC lighting, ventilation, and motors) via a 380 V nominal DC network. This system eliminates the use of AC/DC rectifiers at the loads and reduces the need for DC/AC inverters that are currently required to interconnect solar PV to the electric utility. The reduction in power conversion equipment eliminates frequent points of failure in the system making the overall system more efficient and reliable and reduces maintenance costs. Resiliency is provided by connecting critical DC loads during grid outages directly with the generation sources on the DC network, without requiring expensive transfer switch equipment. Bosch will provide two case studies of industrial facilities that have implemented a DC microgrid system. Key takeaways from this presentation will include an understanding of: (1) DC microgrid market potential; (2) multi-perspective value propositions offered by a DC microgrid for industrial facilities; and (3) lessons learned from Bosch’s deployment of DC microgrids.


Track: A Energy Security & Government Energy Management | FedEnergy Works | Session: Implementing Resilient Infrastructure Solutions


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