Output voltage space vector method

In direct torque control,if we can get any phase of space voltage vector,will help to reduce the

torque ripple under low-speed,reach the steady state performance of vector control at low speeds.In the third quarter no beat control can get any phase of space voltage vector,but calculation is more complex,more difficult.Another for any phase of space voltage vector method is to use PI regulator.A.b.induction motor salesPlunkett direct torque and flux adjustment method is A kind of PI adjustment method,only then had not space voltage vector this concept,can only use the method of SPWM output voltage motor control.In the literature,the proposed method of direct torque control using PI control,and output space voltage vector for the SVM method. Obtained by torque and torque feedback given error input torque PI controller,PI adjustment get q axis acmotortrading.blogspot.com voltage vector and stator flux and stator flux feedback given by the gain of the stator flux linkage error input PI regulator,PI regulation to obtain d shaft voltage vector,then d axis and q axis voltage vector rotation transform the alpha shaft under the static coordinate system and beta,used for the output of the space voltage vector,clearly the space voltage vector in the phase space position is arbitrary.

Structurally similar direct torque control based on PI control on the stator flux vector control,but there is a difference between the two,the stator flux vector control based on synchronous rotating coordinate system,the stator flux orientation in d axis,q axis flux is zero in the d axis direction and the flux and q axis direction of current decouple,and these for direct torque control based on PI control does not need to,among them only need to make the output torque and stator flux feedback can be given by PI regulating method to follow,so from the implementation is relatively simple,robustness is also good at the same time,and compared with the traditional gasoline generator spare parts direct torque control can improve the switching frequency,reduced torque ripple under low-speed,but in this method need to select the right PI parameters,otherwise it will affect the control system dynamic and static performance.In addition to the above this kind of PI control of direct torque control,also in the literature in a.b.Plunkeet direct torque and flux control method on the basis of further research,the use of space voltage vector way output,not detailed here.