Research On Fuzzy Neural Network And It's Applications In Dirct Torque Control

The flux and torque of stator of asynchronous machine are directly tracked, calculated and controlled in the stator-oriented coordinates, using the method of space vector. The signal of PWM is built by dint of the discrete band-band adjustment in order to control optimally the state of the switches of inverter and get the optimal system's dynamic and static response. The theory and technology of DTC have a lot of advantages; however, there are some unperfected aspects as a new theory that makes DTC one of the research hot points.By researching the asynchronous motor driven machine, changing the ways of adjusting stator flux can better the disadvantages of conventional and meet the request of expected system, besides, which makes the stator flux a approximate circle. Fuzzy neural network controller's application in DTC conventional control system can improve the torque response greatly.The key of improving DTC is the switch state selective controller. And the switch depends on the toque error, flux error, and flux angle. It has...