示。
模糊规则如下所示：
模糊控制图见图4.8。
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根据大量的电机工作曲线结合第三章的分析，我们总结出如下34条模糊规则。 (1)If Voltage is lowest and power_factor is lowest then modulus is highest. (2)If Voltage is lowest and power_factor is lower then modulus is highest. (3)If Voltage is lowest and power_factor is low then modulus is highest. (4)If Voltage is lowest and power_factor is average then modulus is highest.
(5)If Voltage is lowest and power_factor is high then modulus is highest. (6)If Voltage is lowest and power_factor is higher then modulus is highest. (7)If Voltage is lowest and power_factor is highest then modulus is highest.
(8)If Voltage is lower and power_factor is lower then modulus is higher. (9)If Voltage is lower and power_factor is low then modulus is higher. (10)If Voltage is lower and power_factor is average then modulus is higher. (11)If Voltage is lower and power_factor is high then modulus is higher. (12)If Voltage is lower and power_factor is higher then modulus is higher. (13)If Voltage is lower and power_factor is highest then modulus is higher. (14)If Voltage is low and power_factor is low then modulus is high. (15)If Voltage is low and power_factor is average then modulus is high. (16)If Voltage is low and power_factor is high then modulus is high. (17)If Voltage is low and power_factor is higher then modulus is high. (18)If Voltage is low and power_factor is highest then modulus is high. (19)If Voltage is average and power_factor is average then modulus is
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average. (20)If Voltage is average and power_factor is high then modulus is average. (21)If Voltage is average and power_factor is higher then modulus is average.
(22)If Voltage is average and power_factor is highest then modulus is average.
(23)If Voltage is high and power_factor is high then modulus is low. (24)If Voltage is high and power_factor is higher then modulus is low. (25)If Voltage is high and power_factor is highest then modulus is low. (26)If Voltage is higher and power_factor is higher then modulus is lower (27)If Voltage is higher and power_factor is highest then modulus is lower. (28)If Voltage is highest and power_factor is lowest then modulus is lowest. (29)If Voltage is highest and power_factor is lower then modulus is lowest. (30)If Voltage is highest and power_factor is low then modulus is lowest. (31)If Voltage is highest and power_factor is average then modulus is lowest.
(32)If Voltage is highest and power_factor is high then modulus is lowest. (33)If Voltage is highest and power_factor is higher then modulus is lowest.
(34)If Voltage is highest and power_factor is highest then modulus is lowest.
4.2 仿真结果分析
仿真参数[54]设置如下：选择的仿真时间0～5s；变步长解法器ode23t；最大最小步长选择自动；选择精细输出。
软起动及降压节能仿真的过程如下：
（1）满载分级变频软起动的过程。0～0.3s，加在定子上的相电压为50V，频 率为10Hz；0.3～0.8s加在定子上的相电压为110V，频率为25Hz；
（2）0.8s后加在定子上相电压的频率不再改变保持工频50Hz，但是定子电 压跟随负载率的变化调节。具体的，在2s时将负载率 β 变化为0.4，3s时变为空载。
由于没有真正意义的空载，我们用常量1而不是零来模拟空载。
仿真过程中，定子相电流、定子相电压、电动机输出转矩、功率因数以及转 速的变化情况如图4.9～4.13所示。
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