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Energy Storage System Safety Operation Plan by Preventing Overcharge During Relaxation Time

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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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Correspondence to Seok-Cheol Kee.

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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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