Research On Model Predictive Current Control Strategy For Permanent Magnet Synchronous Motor With Parameters Mismatch

Permanent magnet synchronous motor model predictive control is a highperformance permanent magnet synchronous motor speed control system control strategy.It is produced in industrial production process control.It has a dynamic response speed,flexible target function configuration,and easy processing nonlinearity.Online optimization control algorithm with advantages such as constraint problems.In this paper,the problem of high sensitivity of model predictive control to motor parameter change is studied.Taking model predictive current control as an example,the model predictive control performance degradation caused by parameter variation is studied.In this paper,the effects of single-vector,double-vector and three-vector model prediction current control strategies caused by motor parameter changes are analyzed in detail,and the current prediction error expressions of each control link are determined.By simplifying the current prediction error expression,a mathematical model of current prediction error compensation is established.According to the mathematical model,an effective estimation of the current prediction error of each control link caused by the change of the motor parameters can be realized.According to the idea of sub-link compensation,this paper proposes that in the original model predictive control system based on the nominal value of motor parameters,the current prediction error model is calculated to obtain the current prediction error of each control link,and the link is compensated to the original control.In the algorithm,the solution to realize the reasonable compensation of the current prediction error caused by the change of the motor parameters is different for the influence of the motor parameter variation on the single-vector,double-vector and three-vector model predictive current control,and the parameter error compensation of the permanent magnet synchronous motor is proposed.Vector,dual vector,and three vector models predict current control strategies.On a 6kW permanent magnet synchronous motor control system,this paper analyzes the transient and steady-state effects of the three-vector model predictive current control by parameter variation,and predicts the parameter error compensationthree-vector model of permanent magnet synchronous motor proposed in this paper.The feasibility of the current control strategy was experimentally verified.The experimental results show that the error compensation algorithm proposed in this paper can effectively compensate the current prediction error caused by parameter variation.