Design and real-time test of a hybrid energy storage system in the microgrid with the benefit of improving the battery lifetime. (15th May 2018)

• Record Type: Journal Article
• Authors: Li, Jianwei; Xiong, Rui; Mu, Hao; Cornélusse, Bertrand; Vanderbemden, Philippe; Ernst, Damien; Yuan, Weijia
• Is Part Of: Applied energy. Volume 218(2018)
• Page Start: 470
• Page End: 478
• Publication Date: 2018-05-15
• Subjects: Battery -- Battery lifetime extension -- Hybrid energy storage system -- Hardware in the loop -- Real-time digital simulator; Power (Mechanics) -- Periodicals; Energy conservation -- Periodicals; Energy conversion -- Periodicals; 621.042
• DOI: 10.1016/j.apenergy.2018.01.096
• Languages: English
• ISSNs: 0306-2619

Abstract

Highlights: A new control method of the hybrid energy storage system is introduced. The battery lifetime has been proved to be extended in the real-time experiment. A new experiment method is proposed using the RTDS&HIL to give real-time verification. A battery lifetime prediction method is introduced. The RTDS&HIL scheme highlights a flexible real-time experimental approach. Abstract: This study proposes a hybrid energy storage system (HESS) composed of the superconducting energy storage system (SMES) and the battery. The system is designed to compensate power fluctuations within a microgrid. A novel control method is developed to share the instantaneous power between the SMES and the battery. The new control scheme takes into account the characteristics of the components of the HESS, and the battery charges and discharges as a function of the SMES current rather than directly to the power disturbances. In this way, the battery is protected from the abrupt power changes and works as an energy buffer to the SMES. An new hardware-in-loop experiment approach is introduced by integrating a real-time digital simulator (RTDS) with a control circuit to verify the proposed hybrid scheme and the new control method. This paper also presents a battery lifetime prediction method to quantify the benefits of the HESS in the microgrid. A much better power sharing between the SMES and the battery can be observed from the experimental results with the new control method. Moreover, compared to the battery only system the battery lifetime is quantifiably increased from 6.38 years to 9.21 years.