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Vector sector positioning method, local optimization model predictive control method and device

A technology of model predictive control and positioning method, applied in circuit devices, output power conversion devices, design optimization/simulation, etc., can solve problems such as consuming computing resources and increasing system delays

Active Publication Date: 2021-02-09
CHINA UNIV OF MINING & TECH
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  • Application Information

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Problems solved by technology

However, when the traditional model predictive control is applied to the control of the five-level active neutral point clamped inverter, each sampling cycle needs to be calculated 8^3=512 times, which consumes a lot of computing resources and increases the system cost. Delay

Method used

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  • Vector sector positioning method, local optimization model predictive control method and device
  • Vector sector positioning method, local optimization model predictive control method and device
  • Vector sector positioning method, local optimization model predictive control method and device

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Embodiment Construction

[0081] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention , but not to limit the scope of the present invention.

[0082] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, ...

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Abstract

The invention discloses a vector sector positioning method, a local optimization model prediction control method and a device. By establishing a detailed prediction model, the control of the midpoint potential of the DC side and the floating capacitor voltage of each phase can be realized while realizing the control of the output current. At the same time, there is a large amount of calculation when performing global optimization in traditional model predictive control, and it is difficult to realize the problem of hardware. The present invention uses the proposed vector sector positioning method to judge in advance the triangular area where the reference voltage is located in the output voltage vector diagram. The cost function is judged in the triangular area, and a global optimization problem is transformed into a local optimization problem in the reference area. On the premise of realizing the control of multiple output variables, the present invention greatly reduces the calculation load of the system, saves calculation resources, and reduces the delay of algorithm control. The five-level inverter controlled by the method has a good output effect.

Description

technical field [0001] The invention belongs to the technical field of multi-level inverter control, and in particular relates to a vector sector positioning method for a five-level grid-connected inverter, a local optimization model predictive control method and a device. Background technique [0002] As an interface for energy conversion, the inverter is a key component in the fields of power grid connection and motor frequency conversion speed regulation. However, with the development of power systems, traditional two-level inverters are gradually unable to meet the needs of large-capacity and high-quality grid connection. The five-level inverter not only has a smaller output voltage and current distortion rate, but also limits dv / dt. At the same time, the five-level inverter requires smaller filter inductors, which greatly reduces the weight and volume of the system. In new energy Grid-connected, rail transit, high-voltage power transmission and distribution and other f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M7/487H02J3/38G06F30/20G06F113/04
CPCG06F17/11H02J3/38H02M7/487H02M7/53871H02J2203/20
Inventor 张晓李枝亮史军伟曾朝玮韩笑笑张辉
Owner CHINA UNIV OF MINING & TECH
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