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In the islanded DC microgrid, the energy storage converters play the role of grid forming. The random characteristics of distributed generation and electric loads lead to the fluctuation of DC microgrid bus voltage, affecting system safety and power supply reliability. In this paper, to suppress the fluctuations and improve the transient response of bus voltage, a perturbation suppression strategy based on state feedback is designed, when the droop control strategy is adopted to form the grid. In this paper, the influencing factors of the transient response of the bus voltage are first analyzed, and the feedforward compensation method is proposed, which can realize the decoupling of the voltage loop and the current loop. Then, the equivalent simplification of the control system is completed without affecting the transient characteristics, and the application of the disturbance observer is achieved. The power disturbance is fed forward to the voltage loop by means of a disturbance observer, and disturbance suppression based on state feedback is realized. Finally, experimental results are given to verify the effectiveness of the proposed control strategy.
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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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