Two-stage matrix converter-driven synchronous reluctance motor model prediction control method

Abstract

The invention discloses a two-stage matrix converter-driven synchronous reluctance motor model prediction control method. A mathematical model of a two-stage matrix converter-driven synchronous reluctance motor system is built based on the input voltage and current at the grid side, the voltage at the input side of a switching circuit, a two-stage matrix converter switching matrix model and the stator current and rotor angular velocity of a synchronous reluctance motor, and is discretized. The input reactive power, synchronous reluctance motor stator flux and electromagnetic torque are predicted according to the built discrete mathematical model. A performance function of error between the input reactive power, synchronous reluctance motor stator flux and electromagnetic torque at next moment and the reference values thereof is built, the switching state of the two-stage matrix converter is optimized with the performance function as a constraint, and the synchronous reluctance motor is controlled using the optimal switching state. The mutual coupling effect between the rectifier level and the inverter level can be eliminated, and the synchronous reluctance motor system driven by a two-stage matrix converter can have excellent transmission performance and high interference resistance.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a model predictive control method of a synchronous reluctance motor driven by a two-stage matrix converter. Background technique [0002] With the development of power electronics technology and computer control technology, AC speed control system has been gradually popularized, and its main power supply equipment is a power converter. Traditional power converters have been unable to overcome the inherent defects of the converter itself, such as low power factor, energy can only flow in one direction, and cause great pollution to the grid. In recent years, a new type of converter, the two-stage matrix converter, has been proposed. The topology is as follows: figure 1 As shown, there is no energy storage capacitor on the DC side, which reduces the size of the device while saving costs. In terms of performance, the input and output currents are sinusoidal, th...

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Problems solved by technology

[0004] With the development of society, the requirements for motor control performance are getting higher and higher in many occasions. In the traditional control system, the PI regulator has the disadvantages of being greatly affected by uncertain factors and complicated parameter setting, which has been difficult to meet the high-performance control requirements.

Due to the unique topology of the two-stage matrix converter, the lack of energy storage capacitors on the DC side brings advantages such as high power density of the device and also makes the two stages of rectification and inverter coupled to each other. Changes in the power grid and filter parameters on the input side will directly affect the Similarly, the performance of the power switch itself, the error of the detection device, and the influence of other factors such as the environment will directly lead to the instability of the output of the two-stage matrix converter. In this case, the two-stage matrix converter drives the synchronous reluctance motor. When the output performance will be affected, the input performance will also be degraded

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