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The “double high” characteristics of new power system make its frequency stability face a huge challenge. Energy storage assisted thermal power unit frequency regulation technology has become a key core technology to ensure the stable operation of the new power system. The mainstream form of energy storage used in this technology, lithium battery storage, suffers from short lifespan and poor safety in use. The features of supercapacitor energy storage like high power, long cycle life, and high security, are highly compatible with the energy-storage requirements of frequency regulation of the energy storage assisted thermal power unit, but the supercapacitor’s response to the continuous unidirectional command is poor. Therefore, it is necessary to explore the technical route of hybrid energy storage to achieve complementary advantages of the two types of energy storage. The hybrid energy storage capacity configuration of supercapacitor and lithium battery was studied, the energy storage capacity configuration method based on the actual AGC frequency regulation command was designed, considering the characteristics of power-type energy storage devices and energy-type energy storage devices. Moreover, the frequency regulation performance and economy of three typical capacity configuration schemes were compared, and the optimal scheme was determined. Finally, engineering verification was carried out. The actual operation data show that, the supercapacitor hybrid energy storage system can improve the frequency regulation performance of the thermal power unit by 59.77%, extend the service life of the lithium battery to 3.6 times, and improve the system economy.
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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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