Abstract
Hybrid energy storage systems (HESS) involves two or more energy sources with complementary electrical charge/discharge characteristics to provide both energy and power requirements of the load. This paper presents an improved frequency sharing control algorithm used along with average current mode control for battery/ultracapacitor (UC) hybrid system in the presence of delay. The control algorithms implemented in different digital platforms have a delay due to computation and sampling time. The presence of delay limits the bandwidth (BW) of inner current loops. At such reduced BW, the improved algorithm proposes to compensate the battery current loop error during transients by UC current loop since the latter is faster. This leads to faster settling of the output. The control algorithm has been implemented in a microcontroller, and the effect of delay time has been considered for controller design to ensure system stability. For efficient HESS operation for load demand at all times, an EMA has also been proposed to charge/discharge the UC for ensuring its nominal voltage. An experimental prototype of the overall system is designed, and the effectiveness of the proposed control algorithm over conventional algorithm has been demonstrated.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.