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To solve the instability problem caused by time-varying communication delay and uncertain faults in an isolated island AC microgrid, a novel robust hierarchical control method is proposed, which includes cascade current loop, voltage loop, virtual impedance and droop control loop. First, a robust controller based on adaptive backward integral non-singular fast terminal sliding mode control is designed in the current loop to adjust and track the current reference value under unknown bounded uncertainties and external disturbances. Second, the hybrid H2/H∞ control is used in the voltage loop, and the state feedback control law is used to generate the inner loop reference value to increase the robustness of the controller to disturbances, and sufficient conditions are given based on the linear matrix inequalities. Considering the unstable effects of time-varying delay (TVD), a distributed protocol based on consistency is adopted in the second control layer to improve the robustness of the controller against TVD. Third, droop control and virtual impedance loop are used to improve the system's power distribution accuracy. Finally, the performance of the proposed control method was evaluated by hardware-in-the-loop simulation, and its effectiveness was verified. Simulation results show that compared with the existing methods, the proposedmethod has advantages in transient response, steady-state performance and fault crossing capability under large and small signal disturbances.
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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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