A finite set model predictive current control method for five-phase permanent magnet synchronous motor

Abstract

The invention discloses a finite set model prediction current control method of a five-phase permanent magnet synchronous motor, which includes mapping the voltage, current and flux linkage of the five-phase permanent magnet synchronous motor in a natural coordinate system to d1 respectively according to the extended Parker rotation transformation formula ‑q1 and d3‑q3 two orthogonal rotating coordinate systems; reconstruct the input voltage vector control set used in the FCS‑MPCC algorithm; obtain the amplitude of Ui' in the d1‑q1 coordinate system and the components of the virtual vector The action time distribution ratio of the two basic voltage vectors required; constructing the objective function in the FCS-MPCC algorithm of the five-phase permanent magnet synchronous motor; selecting the virtual voltage vector that minimizes the objective function as the control output; the selected virtual voltage vector Pulse sequence generation design and other steps. The invention eliminates the low-order harmonic component of the five-phase motor current caused by the harmonic d3-q3 space, ensures that the algorithm does not require too much calculation, is easy to implement with a digital processor, reduces the difficulty of program design, and reduces the number of digital chips operating power consumption.

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 is huge, and the burden on the digital chip is heavy

In addition, when these three FCS-MPCC algorithms are digitally implemented, only a single voltage vector acts in each control cycle, so a higher sampling frequency is required to ensure better steady-state performance of the motor. The frequency requires that the time used for calculation should not be too long, which limits the implementation of MPCC-21 and MPCC-31 algorithms

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