Full
Outline
The service performance and remaining life of a supercapacitor which serves as a novel energy storage device are part of the factors affecting the operation reliability of a system. A 2.7 V/10 F supercapacitor was taken as the research object, an aging experiment and test platform for energy storage devices was built, and the rules for the performance degradation of the supercapacitor and influencing factors were analyzed by collecting the variations in its characteristics. To solve the contradictory relationship between small samples and prediction accuracy of the supercapacitor lifetime prediction training set, a lifetime prediction method combining the non-dominated sorting genetic algorithm II (NSGA-II) with an elite retention strategy and support vector regression (SVR) was proposed, and the average values of charge-discharge cycles and charge-discharge duration were determined as the characterization of supercapacitor performance degradation. Moreover, a dual-objective model with the minimum sample size and highest prediction accuracy in the training set was established. Compared with the BP (back propagation), SVR and LSTM (long short-term memory) methods, the proposed NSGA-II-SVR method improved the evaluation indicators of root mean square error and mean absolute percentage error by 5 to 10 times in supercapacitor lifetime prediction under the premise of a small sample size of the training set. Finally, a generalization experiment was carried out using the open-source data set of lithium-ion batteries provided by NASA, proving that the NSGA-II-SVR method has strong generalization capability.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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