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The permanent magnet synchronous generator （PMSG） is prone to current overstep in unbalanced grid，which affects the reliability of grid-connected system. To solve this problem，low-voltage ride-throgh control strategy based on direct power control was proposed. In this strategy，the direct power inner loop was used to control the grid-side inverter，and the active power and reactive power instructions were divided into DC components and double frequency AC components. The reference values of the DC components of active power and reactive power were calculated on the premise of the low voltage traverse reactive power support and the current amplitude of the inverter. The reference values of the AC components of active power and reactive power were calculated according to three different control objectives according to the voltage and current of the junction point. Then the control loop was designed by the quasi-proportional resonant controller. Finally，a simulation model was built based on Matlab/Simulink，and the simulation results show that the proposed control strategy can improve the dynamic performance of the inverter and improve the operation ability of the grid-connected system under the unbalanced grid.
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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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