To improve the control accuracy of permanent magnet synchronous machine in the flywheel energy storage system (FESS)
an improved model predictive control strategy is proposed. Firstly
by alternately evaluating the cost functions of torque and flux
the weighting factor is eliminated and there is no need to determine the priority of control objectives in this proposed method. The proposed method effectively balances the control performance of torque and flux. Subsequently
to reduce the torque and flux fluctuations of the FESS
a double-vector synthesis method is designed and the duty cycle calculation process is simplified. In addition
to improve the parameter robustness of the system
the least squares method is used to identify the machine parameters and update the controller parameters in real time. Finally
the feasibility and effectiveness of the proposed control strategy in FESS charging and discharging conditions are experimentally verified.
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references
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