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Model predictive control method for ipop three-level buck converter system

A technology of predictive control and control method, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. Promotion and other issues to achieve the effect of facilitating modular design, improving scalability, and improving dynamic response

Active Publication Date: 2021-04-27
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the outer voltage loop of this invention still adopts PI control, and parameters still need to be adjusted during application, and it has not been extended to the occasion of multi-phase (3-phase and above) converter IPOP
[0007] 3. An article entitled "Model Predictive Control Applicable to Boost Three-Level Converters", "Power Automation Equipment", pp. 90-96, Issue 3, 2019. This article proposes a method for three-level Boost converters model predictive control method, but this article only studies the model predictive control of a single converter
[0008] None of the above methods can be well applied to the control of IPOP three-level step-down converters. Therefore, it is necessary to design an IPOP three-level three-level converter that does not require complicated parameter setting, has fast dynamic response, good power sharing effect, and is easy to expand. System control method for flat buck converter

Method used

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  • Model predictive control method for ipop three-level buck converter system
  • Model predictive control method for ipop three-level buck converter system
  • Model predictive control method for ipop three-level buck converter system

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Embodiment Construction

[0056] The present invention will be further described below in conjunction with the accompanying drawings.

[0057] figure 1 It is the topological diagram of the IPOP type three-level step-down converter involved in the present invention. Depend on figure 1 It can be seen that the topology of the IPOP three-level buck converter system using this control method includes the input DC voltage source V in , Input filter capacitor C in , n sets of three-level step-down converters, output filter capacitor C o , load R L .

[0058] The input filter capacitor C in with the input DC voltage source V in In parallel, the input DC voltage source V in The DC positive bus is denoted as O in + , DC negative bus is denoted as O - , the output positive bus is denoted as O o + ; the load R L The positive pole and the output positive bus O o + phase connected, the load R L The negative pole of the input DC voltage source V in The DC negative bus O - phase connection; the outp...

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Abstract

The invention discloses a model predictive control method for an IPOP type three-level step-down converter system, which belongs to the technical field of power electronics. This method first samples the input voltage and output voltage of the system at the current moment and the voltage of the flying capacitor and the current of the filter inductor of each three-level buck converter at the current moment; then identifies the load resistance of the system, and then solves the current command of the system ; Then predict the voltage of the flying capacitor and the current of the filter inductor of each three-level step-down converter at the next moment; finally, according to the current cost function and voltage cost function of each three-level step-down converter, solve each three-level step-down converter The duty cycle of the power switch tube of the flat buck converter. The control method has the characteristics of no complex parameter setting, fast dynamic response, easy expansion, etc., and can well realize the balance of the flying capacitor voltage and the equal sharing of the power of each three-level step-down converter.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an IPOP type three-level step-down converter system model predictive control method. Background technique [0002] With the development of energy technology, the demand for medium and high-power electric energy conversion systems is also increasing, and power electronic converters are more and more widely used in medium and high-power applications. At present, in small and medium power applications, the existing power electronic devices have basically met the requirements, but in some high-power applications, the power electronic devices still cannot meet the requirements. [0003] In order to adapt to the occasion of high-power electric energy conversion, many researchers at home and abroad have proposed multi-level circuit topology and parallel connection technology of converters. Among them, the voltage borne by the power switching tube and power diode o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 张兴钱尼信赵涛赵文广王明达高帅李飞
Owner HEFEI UNIV OF TECH
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