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Modular multi-level matrix converter（M3C）is a kind of new topology which can convert one specified electric frequency to another directly，it is applicable to high voltage and large capacity scene. In the fractional transmission system，the complete flow was introduced to achieve power frequency grid fault ride-through. The arm power state equation of M3C in double α-β frame was introduced when power frequency voltage and fractional frequency voltage is unsymmetrical. The control strategy of switching on braking resistor in the fractional frequency side based on the average voltage of all sub-module capacitor was introduced，in order to consume redundant power in the fractional frequency side. Positive and negative sequence reactive current based on the power frequency positive voltage dips and negative voltage component were output. In addition，when power frequency positive sequence voltage is too low，diagonal balancing control was converted to the fractional frequency side from the power frequency side，which can realize the balance of all arm sub-module capacitor voltage in the process of power frequency grid fault ride-though. At last，a 3.3 kV/3.3 kV/3 MV·A M3C model was built in Matlab/Simulink，the effectiveness of power frequency grid fault ride-through strategy was validated.
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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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