A Research On Parameters Determination Method About Flux Observer

Induction motor direct torque control technique has played an important role in variable frequency motor speed control field, as the promoting of automation degrade, man bring forward higher request toward the motor control system, the development and applying of new technique in industrial automation field inject new vigor for direct torque control technique, inosculating new technique, upgrading the capability of control system will become the develop direction.Induction motor direct torque control method has the characters such as simple calculation, little dependence to motor parameters, excellent dynamic and static performance. But on the same time, it exists the problem of lower control precision, large influence suffer from motor parameters on the low speed stage, large concussion when motor exchanges between high speed and low speed. This paper discusses the construction method of direct torque control system, analysis flux observation tache, introduces conventional flux observation model and flux observation based on nerve network technique, compare the advantage and disadvantage each model.The paper introduces the direct torque control system model and theory, then, introduces the flux observation model on the high speed stage and low speed stage, and adaptive flux observation model. Presents the parameter tuning method and Modeling and Simulations. Gives the serving method aiming at the problem appearing on the simulation process, according to Lyapunov Stability theory, establish Lyapunov adaptive flux observation model, Particular introduces the tuning method of key parameter of these model. Applying the nerve network knowledge, simulation data of adaptive model, constructs the BP flux observation model and speed observation model.This paper starts from flux observation, introduces the tuning method of model parameter, realizes the exchange between high-speed and low-speed under direct torque control arithmetic, constructs the direct torque control system, and inosculating NN technique on the construction process of flux observation model and speed observation model, improves the capability of control system.