Abstract
Large-capacity energy storage system (ESS) secure storage capacity by connecting batteries in parallel. When an ESS is fully charged, energy loss occurs due to passive cell balancing of the battery management system (BMS). A compensation current flows in from the batteries connected in parallel, and battery overcharge occurs. In particular, the number of cells being balanced in a battery stack connected in parallel is not constant. In a prior study, a charging problem that occurred after the complete charging of compensation current caused by the potential difference in the battery stack was resolved with the release of a parallel connection by opening the power relay assembly (PRA). We proposed a method that can be applied directly to the existing ESS only by charging S/W. There is no additional device cost. This study proposes a method to optimize the stabilization time when batteries are connected in parallel. To minimize the time to safely connect batteries in parallel, we propose a method of using the current limiting resistor of the PRA and cell balancing to avoid the effects of compensation current. It was verified through simulation using PSpice v16.6.
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Abbreviations
- ESS:
-
Energy Storage System
- BMS:
-
Battery Management System
- PRA:
-
Power Relay Assembly
- CCTV:
-
Closed-Circuit television
- PCS:
-
Power Conditioning System
- t1:
-
Initial time
- t2:
-
Cell balancing time
- Ibal :
-
Cell balancing current
- Rbal :
-
Cell balancing resistance
- N:
-
Number of cells with cell balancing operation
- nmax :
-
Maximum number of cell balancing
- ntotal :
-
Total number of cells
- Ipre :
-
Precharge current
- Rpre :
-
Precharge resistance
- ADC:
-
Analog-to-Digital Converter
- SOC:
-
State Of Charge
- Pbal :
-
Power consumed by cell balancing
- Pcp :
-
Compensating power
- SECbal :
-
Cell balancing progress time
- SECpre:
-
Pre-charge time
- T∞ low :
-
Time the compensation current flows
- OVP:
-
Over voltage protection
- SP:
-
Short Protection
- FET:
-
Field Effect Transistor
- MCC-CV:
-
Multi-constant current-constant voltage
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Acknowledgements
This work was supported by Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (N0002428, The Competency Development Program for Industry Specialist).
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Kee, SC., Yun, S.S. Energy Storage System Safety Operation Plan by Preventing Overcharge During Relaxation Time. J. Electr. Eng. Technol. 16, 1941–1953 (2021). https://doi.org/10.1007/s42835-021-00749-x
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DOI: https://doi.org/10.1007/s42835-021-00749-x