Finite-control-set model predictive current control method of five-phase permanent-magnet synchronous motor

Abstract

The invention discloses a finite-control-set model predictive current control method of a five-phase permanent-magnet synchronous motor. The finite-control-set model predictive current control method comprises the steps of respectively mapping a voltage, a current and magnetic flux of the five-phase permanent-magnet synchronous motor under a natural coordinate system to two orthogonal rotating coordinate systems of d1-q1 and d3-q3 according to extended Park rotation transform; constructing an input voltage vector control set which is used in an FCS-MPCC (Finite-Control-Set Model Predictive Current Control) algorithm again; solving amplitude of U<'> of the (d1-q1) coordinate system and an acting time allocation proportion of two basic voltage vectors required for forming a virtual vector; constructing a target function in the FCS-MPCC algorithm of the five-phase permanent-magnet synchronous motor; selecting the virtual voltage vector which enables the target function to be minimum as control output quantity; and performing steps of pulse sequence generation and design on the virtual voltage vector. By the finite-control-set model predictive current control method, a low-order harmonic component of a five-phase motor current caused by a harmonic (d3-q3) space is eliminated, the algorithm is enabled not to require excessive calculation quantity, a digital processor is liable to implement, the difficulty of program design is reduced, and the running power consumption of a digital chip is reduced.

Description

technical field [0001] The invention relates to the field of design and manufacture of a multi-phase motor AC control system (including a five-phase inverter and a five-phase permanent magnet synchronous motor) in the field of power electronics and electric transmission, especially a finite set model prediction of a five-phase permanent magnet synchronous motor current control method. Background technique [0002] The rapid development of microelectronics technology and power electronics technology has laid the foundation for the motor control system to get rid of the traditional three-phase topology limitation. The advantages of replacing the traditional three-phase with a multi-phase AC speed control system mainly lie in: 1) the frequency of the electromagnetic torque ripple is increased, the amplitude of the ripple is reduced, and the vibration and noise of the motor are reduced; 2) the current stress of the single switching device Small size, large inverter capacity, go...

AI Technical Summary

Problems solved by technology

The MPCC-11 algorithm only needs to repeatedly calculate 11 voltage vectors, but the magnitude of the voltage vector is single and the largest, which will cause large steady-state torque fluctuations of the motor, while the MPCC-21 and MPCC-31 algorithms can improve the steady-state of the motor performance, but it is necessary to perform repeated calculations on 21 and 31 voltage vectors respectively, the amount of calculation

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