Research On Control Algorithm Of Asynchronous Motor Based On Improved Deadbeat Prediction

In production and life,asynchronous motors have been widely used in various fields due to their simple structure,low price and reliable operation.The control precision of the motor will directly affect the quality of the product.Therefore,improving the operating efficiency of the asynchronous motor and ensuring its operational reliability has always been a hot spot in motor control research.In this paper,the three-phase asynchronous motor is taken as the research object,and the deadbeat prediction algorithm is the control core,and its control performance is studied.Firstly,the paper establishes the state equation of the asynchronous motor in the three-phase stationary coordinate system,and carries out the coordinate transformation to obtain the state equations under the two-phase stationary coordinate system and the two-phase rotating coordinate system respectively.In addition,the characteristics of the mathematical model under each coordinate system are described.The principle and implementation method of space vector control are analyzed in detail,which provides a basis for the preparation of SVPWM program.Secondly,in order to accurately obtain the feedback flux linkage and load torque in the control,three flux observers and a load torque observer are designed including flux linkage observer based on current-speed model,full-order flux linkage observer and the sliding mode flux observer.The performance and observation accuracy of each observer is compared and analyzed.Then,the paper further introduces the theory of deadbeat predictive control,deduces the algorithm of three-phase asynchronous motor based on deadbeat prediction control,and introduces a synergetic control theory,which will improve the deadbeat prediction control algorithm and realize independent control of speed and flux linkage.Based on these,a simulation platform is built,and the control performance of the two control algorithms is compared.The robustness of the two control algorithms is further verified by changing parameters.Finally,the experimental platform of three-phase asynchronous motor is built in this paper.The experimental program based on deadbeat prediction control is designed.The no-load experiment and loading experiment are carried out respectively.The feasibility of the algorithm is verified by experimental data.