Low-complexity predictive control method for permanent magnet synchronous motor

Abstract

The invention discloses a low-complexity predictive control method for a permanent magnet synchronous motor, wherein the control circuit includes a three-phase full-bridge inverter circuit, a detection circuit, a drive circuit and a control circuit, and the rotational speed of the motor at the current moment is obtained by calculating the position feedback, It is transmitted to the control circuit together with the position feedback value and current signal; the current prediction value at the next moment is calculated through the discrete mathematical model of the general permanent magnet synchronous motor inside the control circuit, and the switch state judgment is designed according to the positional relationship between the current sampling current and the reference current. According to the objective function of the switching state that satisfies the judgment, the switching state output that minimizes the objective function is obtained, and the switches of each bridge arm on the inverter circuit are controlled. This method designs a simple criterion by referring to the relationship between the current and the current vector to pre-judge the voltage vector, which effectively reduces the number of switch states required to be calculated each time, and greatly reduces the calculation amount of the algorithm and control complexity.

Description

technical field [0001] The invention relates to the technical field of variable frequency speed regulation control of a permanent magnet synchronous AC motor drive system, in particular to a low-complexity predictive control optimization method for a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor is a kind of permanent magnet motor. By adding permanent magnets to the rotor, the control system has no excitation link; in occasions where the size and weight of the motor are required, such as high-performance servo drives in electric vehicles, aerospace and other fields There are wide applications in the system. Because the distribution of its internal magnetic field in the internal space is not vertical and has a coupling relationship, it is often described as a nonlinear, multivariable, and strongly coupled system. For such a system, the more common control schemes are vector control based on linear control theory and dire...

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Problems solved by technology

For a permanent magnet synchronous motor driven by a multi-level inverter, the amount of calculation is very large, and it is difficult to implement in a microprocessor

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