Title | ||
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Real-time identification of state-of-charge in battery systems: Dynamic data-driven estimation with limited window length. |
Abstract | ||
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This paper presents a symbolic dynamic method for real-time estimation of battery state-of-charge (SOC). In the proposed method, symbol strings are generated by partitioning (finite-length) time windows of synchronized input-output (e.g., current-voltage) pairs in the respective two-dimensional space. Then, a special class of probabilistic finite state automata (PFSA), called D-Markov machine, is constructed from the symbol strings to extract pertinent features. The SOC estimation is formulated as a sequential estimation scheme with adaptive acceptance of new features to circumvent the problem of having potential outliers. A major challenge is that SOC value is continuously varying during the operation. While modeling and analysis of such time-varying problems is computationally intensive, the data-driven approach requires adequate length of time series data for statistically significant analysis. From these perspectives, a critical aspect is to determine an optimal (or suboptimal) length of the analysis window to make a tradeoff between estimation accuracy and dynamic sensitivity. The proposed method has been validated on experimental data of a commercial-scale lead-acid battery. |
Year | Venue | Field |
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2016 | ACC | Time series,Control theory,Computer science,Outlier,Algorithm,Electronic engineering,Feature extraction,Dynamic data,Time–frequency analysis,Sequential estimation,Dynamic method,State of charge |
DocType | Citations | PageRank |
Conference | 0 | 0.34 |
References | Authors | |
0 | 3 |
Name | Order | Citations | PageRank |
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Pritthi Chattopadhyay | 1 | 7 | 2.48 |
Yue Li | 2 | 15 | 3.13 |
Ray, A. | 3 | 832 | 184.32 |