Predictive control

In this method,through the flux linkage space vector and voltage vector relation can be get:The S is under the effect of voltage vector flux amplitude change of amount,theta V is both space Angle. Sampling period of flux linkage error is set the first k SO,SO [5] according to the formula,can get the first k+1 cycle of flux linkage error is zero vector function for time. To the principle of torque control priority according to the calculated acmotortrading.blogspot.com torque predictive control time and flux linkage vector function of predictive control calculated time can get comprehensive vector function of time. After considering magnetic chain of beat control compared to the pure torque without beat control effect is good,is to eliminate the torque ripple,and won't produce magnetic chain distortion,and will not be too large amount of calculation. In addition to the torque difference frequency control method,also adopted a similar approach in the literature,the voltage vector calculation time is basically the same,not detailed here. Like Habetler no beat method,forecasting method also need more motor parameters,if you can online real-time identification of ac alternators 220v the stator resistance and rotor time constant,will greatly improve the control precision. 

Direct torque control in discrete time Discrete-time direct torque control using the method of discrete time control of asynchronous motors in the literature have more detailed introduction,in the

literature,for the first time this kind of method used in direct torque control,the base is as

follows: the method of the basic circuit of the motor voltage equation and flux equation obtained by

model discretization is as follows:Type a,b,the definition of the counter rotating torque equations

are discretized,and once the equation in which,at the same time also once into the equation to the

flux amplitude square expression,using discrete torque equation and discrete flux amplitude flat way can solve out the next cycle of space voltage vector increment VSx and VSy,plug in the following equation of torque and flux can be obtained without beat control of voltage vector,and on the limit:Discrete-time direct torque control can be achieved by difference equation,the k+1 cycle should reach the torque and flux linkage pass out,so we can both meet the torque and flux of beat control,from the implementation approach is very suitable for gasoline generator spare parts digital control,in addition to control,this method is mainly based on the stator side required motor stator resistance and inductance parameters,better robustness to the motor parameter changes,from the point of the experimental results,the dynamic response of the system performance is better. In this approach,however,need to detect phase voltage of the motor,the increase of the complexity of the hardware of the system,in addition,a fairly large amount of calculation.