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2022 (English)In: Proceedings of the 16th International Renewable Energy Storage Conference (IRES2022), 2022Conference paper, Published paper (Other academic)
Abstract [en]
Battery systems are used in a wide range of safety-relevant applications, such as electric vehicles, unmanned aerial vehiclesand home storage systems. Safety, reliability and availability of the battery system therefore play a key role. In addition, theuseful service lifetime of the batteries determines the environmental impact and economic efficiency of the overall system. Onepossible solution is to give batteries a second life in applications with lower requirements in terms of dynamic behavior or capacity.Heterogeneous battery systems consist of batteries with differences in cell technology, age, capacity, and optimal operating range.To meet the safety, reliability, and availability requirements a scalable, Decentralized Battery Management System (DBMS) basedon a distributed control system is proposed. Batteries, generators, and loads have Local Control Units (LCUs) consisting of amicrocontroller, a measurement unit, and a DC/DC converter with adjustable voltage and current limits. These LCUs are the basis forthe communication-based, cooperative system control and enhance the reliability and scalability of the battery system compared toconventional centralized structures. They record and manage the operating parameters and provide the basis for predictive energymanagement and battery residual value estimation. As a fallback strategy, a droop-based control of the DC/DC converters is used inaddition to the communication-based one. Transition conditions between the control modes are defined and the control methods arecompared and differentiated. The performance and the resulting benefits of batteries are determined by the control strategies. In thispaper, the requirements for the control strategies for different operating modes, including startup, severe fluctuations of the DC powerline voltage, and safe shutdown, are analyzed.
Keywords
Renewable energy sources, battery management system, second life battery, decentralized control, distributed control, control strategies, droop control, battery optimal operation
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-192984 (URN)
Conference
Proceedings of the 16th International Renewable Energy Storage Conference (IRES2022), 20 - 22 September 2022, Düsseldorf, Germany 2022
2023-04-062023-04-062023-04-12