Active Disturbances Rejection Control Of Field-Oriented Linear Synchronous Motor Drive System Of High Speed Maglev Train

The linear synchronous drive system of maglev train is a multi-variable, strong nonlinearity and model uncertainty control object. Because of such complication,it's difficult to design the controllor. Using vector control method,the control system of linear synchronous motor can be decoupled into torque and magnetic flux subsystems, realized decouping control to a certain degree.To design controller of linear synchronous motor which is field-oriented, PI adjustor is widely used. PI adjustor uses classic regulation theory,and doesn't relay on mathematic model. It's a control strategy based on error feedback. Because of simplicity and practicality, PI adjustor is widely used in practical system.But PI adjustor has it's own limitation, control performance doesn't show very well. One group control parameters can't adapt all environment.ADRC is a control method based on disturbance rather than relying on the object model, which can ensure control precision on the condition of strong nonlinearity and uncertain strong disturbance. At present ADRC mainly consists of TD, ESO and NLSEF. Basing on ADRC and setting the The linear synchronous motor of maglev train as the object, controllors of speed and current loop have been designed to deal with the influences of the unknown external disturbances and the coupling items in speed and current models. With some non-linear components in the typical ADRC model replaced by their corresponding linear models, the structure of the model is simplified and its computation load is reduced. In order to validate the control perfomance of ADRC, various disturbances have been imposed in the simulation. Simulation results show that this control method can excellently observe various disturbances and makes feedforward compensation, and has advantages of quick response,robustness and no overshoot.In order to compare with PI adjustor, PI control method is also simulated in this paper. Simulation results show that in various disturbances environment, ADRC has better control perfomance, has advantager of quick response,robustness and no overshoot.There are a little more parameters need to be setted in ADRC controllor, and temporarily parameter tuning is still a problem. This paper uses simulation analysis method to find influences caused by changing parameters, and gives some general rules that govern the selection of its parameters.