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Maximum torque per ampere （MTPA）control can effectively improve system efficiency through reducing copper loss，which is suitable for air conditioning permanent magnet compressor system. However，due to the inverter non-ideal characteristics，the tracking accuracy of the optimal current vector angle decreases.The negative influence of inverter non-ideal characteristics on virtual direct signal injection based MTPA control and the compensation method were studied. Aiming at the digital delay issue of the control system，the voltage information in the process of current vector angle tracking was corrected according to the system sampling time. In addition，the saturation function based dead-time compensation method was utilized to reduce the voltage error caused by the inverter nonlinearity. Experimental results show that the compensation method of inverter non-ideal characteristics improves the tracking accuracy of the optimal current vector angle.
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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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