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Outline
Aiming at the problems of high-frequency jitter and phase delay caused by the use of constant sliding mode coefficients, sign functions, and low-pass filters in traditional super twisting sliding mode observer (STSMO), an improved STSMO based on fuzzy control is proposed. Firstly, fuzzy control is used to optimize the constant sliding mode coefficient. Secondly, a new type of continuous function T(s) is used instead of the sign function to reduce jitter, and an Kalman filter is introduced for secondary filtering to further improve the jitter reduction effect. Finally, an enhanced quadrature phase-locked loop (eQPLL) is used to replace the arctangent function to further improve the system and enhance observation accuracy. For time-varying nonlinear permanent magnet synchronous motor (PMSM) control systems, fractional order proportional integral derivative (FOPID) controller can more finely adjust the dynamic response of the system than traditional proportional integral derivative (PID) controller. Therefore, FOPID controller is used to replace the traditional motor speed loop proportional integral (PI) controller. Simulation and experimental results verify that the proposed improved control strategy effectively reduces overshoot, significantly improves the dynamic tracking performance of rotor position and speed, and the improved control system has stronger robustness.
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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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