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Model predictive control method, controller and system for three-level variable frequency speed regulation system

A technology of three-level frequency converter and variable frequency speed regulation, which is applied in the direction of AC motor control, control system, electrical components, etc., can solve difficult problems such as small vector and uncertain influence of midpoint potential of small vector, and achieve reduction in calculation Quantity, improve control efficiency, fast response effect

Active Publication Date: 2021-07-30
SHANDONG UNIV
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Problems solved by technology

The inventor found that in the three-level frequency converter topology of the three-level frequency conversion speed regulation system, when the motor is no-loaded, light-loaded, low-speed and DC-braked, if the redundant small vector is used to realize the midpoint of the DC side Voltage balance control, the influence of the small vector on the midpoint potential is uncertain, it is difficult to choose a suitable small vector to control the midpoint voltage balance

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  • Model predictive control method, controller and system for three-level variable frequency speed regulation system
  • Model predictive control method, controller and system for three-level variable frequency speed regulation system
  • Model predictive control method, controller and system for three-level variable frequency speed regulation system

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[0038] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0040] It should be noted that the terminology used herein is only for describing specific embodiments, and is not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

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Abstract

The disclosure provides a model predictive control method, controller and system for a three-level frequency conversion speed regulation system. Among them, the model predictive control method of the three-phase three-level frequency conversion speed regulation system includes: dividing the space voltage vector corresponding to the topology of the three-phase three-level inverter into 12 sectors; determining the current output of the three-phase three-level inverter The sector to which the voltage vector belongs; according to the sign of the difference between the upper capacitor voltage and the lower capacitor voltage of the three-phase three-level inverter topology and the direction of the current of each phase, determine the current sector that can achieve balanced control of the midpoint voltage on the DC side The space voltage vector required by the sector; from the space voltage vectors required by the current sector, select the space voltage vector that minimizes the cost function; where the cost function is the components of the space voltage vector and the current output voltage vector on the αβ axis respectively The modulus value of the difference; use the selected space voltage vector to control the switch state of the three-phase three-level inverter, and realize the frequency conversion speed control of the motor.

Description

technical field [0001] The disclosure belongs to the field of power electronic control, and in particular relates to a model predictive control method, controller and system for a three-level frequency conversion speed regulation system. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] AC motors have been widely used in AC speed regulation fields such as fans and pumps due to their advantages such as simple structure, durability, reliability, low cost, and easy manufacture. Early AC speed control systems used rotor circuit series resistors and stator circuit step-down to achieve speed control functions, but these methods consume a lot of power and have poor control effects. With the development of power electronics technology, frequency converters with AC frequency conversion and speed regulation functions have played an important role in...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/12
CPCH02P27/12
Inventor 张承慧李晓艳邢相洋秦昌伟
Owner SHANDONG UNIV
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