VRLA battery discharge reserve time estimation

The discharge reserve time of a valve regulated lead acid (VRLA) battery is dependent on both discharge operating conditions as well as battery condition. Operating conditions include discharge type and rate, ambient temperature and initial state of charge while battery conditions include battery st...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2004-11, Vol.19 (6), p.1515-1522
Main Authors: Pascoe, P.E., Anbuky, A.H.
Format: Article
Language:English
Subjects:
Ambient temperature
Applied sciences
Back up systems
Backup power system
Batteries
Battery
Charge
Costs
Data processing
Discharge
discharge characteristic
Electric batteries
Electrical engineering. Electrical power engineering
Electronics
Exact sciences and technology
Power electronics, power supplies
Power supply
Power system reliability
reserve charge/time
Reserves
Robustness
State estimation
Temperature
Testing
Uninterruptible power systems
valve regulated lead acid (VRLA) battery
Valves
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Description
Summary:The discharge reserve time of a valve regulated lead acid (VRLA) battery is dependent on both discharge operating conditions as well as battery condition. Operating conditions include discharge type and rate, ambient temperature and initial state of charge while battery conditions include battery state of health and battery type. For this reason determining the discharge reserve time can be a very complex problem. This paper presents a simple approach for estimating VRLA battery state of charge (SOC) and thus discharge reserve time during discharge over a wide range of operating and battery conditions. A discharge characteristic, referred to as the unified characteristic, is employed that is shown to be robust to variations in operating conditions as well as battery condition. Furthermore, the resulting accurate estimations of SOC (within 10%) and reserve time (within 10% from the early stages of the discharge) do not come at the cost of complexity.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2004.836680