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A FCS-MPC Control Method for Multilevel Inverter without Weight Factor

A technology of multi-level inverter and control method, which is applied to electrical components, CAD numerical modeling, CAD circuit design, etc. Effect

Active Publication Date: 2021-07-23
XUZHOU NORMAL UNIVERSITY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The performance index of the multilevel inverter is divided into three layers by using the hierarchical optimization method to solve the problem of difficult setting of the weight factor in the multilevel inverter and reduce the amount of prediction calculation

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  • A FCS-MPC Control Method for Multilevel Inverter without Weight Factor
  • A FCS-MPC Control Method for Multilevel Inverter without Weight Factor
  • A FCS-MPC Control Method for Multilevel Inverter without Weight Factor

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Embodiment Construction

[0026] Below in conjunction with the accompanying drawings, the present invention will be further described with the non-weight factor FCS-MPC control when the five-level inverter has a resistive load. The specific implementation steps of the present invention are as follows:

[0027] 1) to t k The current is sampled at any time to obtain the actual value of the current [i α (t k ), i β (t k )], i α (t k ) is the actual value of the α coordinate axis, i β (t k ) is the actual β coordinate axis, and the optimal switch vector S(t k )=(S a (t k ),S b (t k ),S c (t k )) acts on the inverter;

[0028] 2) Control delay compensation. Since the optimal vector predicted in this cycle can only be used in the next control cycle, and the optimal vector in the last week is applied in this cycle, it is necessary to predict and compensate the actual value of the current for one control cycle. That is, predict S(t according to the prediction model k )=(S a (t k ),S b (t k...

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Abstract

A FCS‑MPC control method for multilevel inverter without weight factor. Multilevel inverter FCS‑MPC is a typical multi-objective optimization problem. The multi-level inverter with voltage suppression and current following control has no weight factor FCS-MPC control. The present invention adopts a layered optimization method to optimize the performance index of the multi-level inverter through a three-layer optimization design: the first layer, Based on the voltage jump limit, select the adjacent switching vector of the optimal switching vector determined in the previous cycle; the second layer, based on the satisfactory optimization of common-mode voltage suppression, eliminates the current following performance optimization under the condition that the optimization of the first layer is not affected. Select redundant vectors with large common-mode voltage in the vectors; the third layer, the optimal control of current following, outputs switching vectors with optimal current following, and acts on the inverter in the next control cycle. This method solves the problem of weight The problem of factor setting can be reduced to 4‑7 calculations.

Description

technical field [0001] The invention relates to the technical field of multilevel inverter control, in particular to an FCS-MPC control method for a multilevel inverter without a weight factor. Background technique [0002] Natural resources are becoming increasingly scarce, and inverters play an important role in energy conservation and emission reduction. Traditional two-level inverters can no longer meet the needs of production practice, while multi-level inverters have low device stress, low harmonic content, etc. The advantages of low effective switching frequency have been widely concerned and studied. The finite control set model predictive control (FCS-MPC) technology has the advantages of intuitive modeling, simple control, multi-objective optimal control, and no PWM modulator and PI parameter adjustment. The main research direction of inverter control. [0003] Multi-level inverter FCS-MPC is a typical multi-objective optimization problem. The traditional weight ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483G06F30/30G06F111/10
CPCH02M7/483
Inventor 王宇王贵峰刘战李飞李春杰夏正龙
Owner XUZHOU NORMAL UNIVERSITY