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To address the issues of a low recovery rate of motor braking energy and significant fluctuations in the DC bus voltage, a braking energy tracking strategy is put forward. This strategy can adjust the reference value of the supercapacitor current in real time by considering multiple parameters, including motor power, the efficiency of the bidirectional DC/DC converter, and the supercapacitor voltage. The discrete state space model of the energy storage unit is used to predict the current and voltage of the supercapacitor, and the current reference value of the supercapacitor is calculated by combining the other parameters in the system. The current loop based on Proportional-Integral (PI) is used to control the current of the supercapacitor and track the reference value of the current in real time. Simulation and experiments compared the tracking of regenerative energy under two different control strategies. The results indicate that the proposed strategy enhances the efficiency of regenerative energy recovery from 55.93% to 86.76%, and it restricts the voltage fluctuation of the DC bus within 0.9%.
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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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