Full
Outline
Mine inverters typically operate in enclosed spaces where the thermal-electric coupling effect is significant, leading to thermal degradation and thermal failure. Additionally, mine inverters and motors are often connected by long cables, necessitating a consideration of the high-frequency negative effects of these cables. A 630 kW/1 140 V four-quadrant mine inverter is taken as a research object, its integrated thermal-electric coupling model is established, and its relevant characteristics are analyzed. First, a high-frequency circuit model of the mine inverter is constructed. Second, the mechanism by which the losses of various power devices are affected by temperature is studied, the nonlinear relationship between temperature and some losses is analyzed, and analytical models for losses changing with temperature are derived. Finally, the coupling relationship between the high-frequency circuit model, loss model and temperature field model is analyzed, and the integrated thermal-electric coupling model of the mine inverter is built. The simulation results of coupling demonstrate that it is necessary to perform thermal-electric coupling modeling, and the maximum error between experimental and simulation temperature results is only 0.9 ℃, validating the accuracy of the established model.
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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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