Flux Weakening Strategy of PMSM Based on Model Predictive Control
In order to solve the problem of current oscillation and current regulator saturation under the volt-age feedback flux weakening control strategy of permanent magnet synchronous motor,which caused by poor voltage external loop control parameters,a flux weakening strategy based on model predictive control was proposed.Firstly,the linear model of the current loop was obtained by taking the nonlinear coupling term and the speed of the voltage equation as one of the state variables.Then,based on the model,the model predictive control took the current tracking error and the d-q axis control voltage increment as the optimiza-tion objectives,and solved the optimization problem in the finite time domain in each sampling period to ob-tain the d-q axis control voltage.Finally,the simulation and experimental results show that the current re-sponse performance of the proposed strategy is more robust to the control parameters of the voltage outer loop than that of the traditional voltage feedback strategy.
permanent magnet synchronous motorflux-weakening controlmodel predictive control
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