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Control method and device of multi-stage power electronic converter system

A technology for power electronics and control devices, applied in circuit devices, output power conversion devices, electrical components, etc., can solve problems such as increased cost and low on-state impedance, and achieve the effect of ensuring safe operation and fast dynamic planning

Inactive Publication Date: 2022-02-18
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the efficiency of the system is mostly improved through device innovation, such as the use of power switching devices with low switching loss and low on-state impedance, and the use of magnetic devices with low core loss, which will lead to an increase in the cost of the entire system

Method used

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  • Control method and device of multi-stage power electronic converter system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 As shown, a control method for a multi-level power electronic converter system includes the following steps:

[0020] S1. Construct the relationship of working condition parameters between the power electronic converters at all levels, between the bus bars of the power electronic converters at all levels, and between the power electronic converters and the bus bars of the power electronic converters at all levels;

[0021] S2. Construct a multi-level power electronic converter system control model based on the correlation, with the goal of maximizing the product of the efficiencies of the power electronic converters at all levels, the working condition parameters of the power electronic converters at all levels, the power electronic converters at all levels The operating condition parameters of the busbar are constrained conditions, and the dynamic programming of the working state control instructions of power electronic converters at all levels is real...

Embodiment 2

[0024] A control device for a multi-level power electronic converter system, including: a multi-level power electronic converter system control model for realizing dynamic programming of the working state regulation instructions of each level of power electronic converter; The operating condition parameters of the converter and the working condition acquisition module of the operating condition parameters of the power electronic converter busbars at all levels; the efficiency calculation model for real-time feedback of the product of the efficiency of the power electronic converters at all levels; in this embodiment, the The control model of the multi-level power electronic converter system is constructed based on the relationship between the power electronic converters at all levels, between the bus bars of the power electronic converters at all levels, and between the power electronic converters and the bus bars of the power electronic converters at all levels. , with the goa...

Embodiment 3

[0028] It also includes: an on-off switch for controlling the connection and / or disconnection of power electronic converters at all levels, so that the flexible connection and disconnection of power electronic converters at all levels can be realized; the rest of the design is the same as that of embodiment 2, it is worth noting Yes, the multi-level power electronic converter system control model is constructed based on the currently connected power electronic converters and bus bars. When the connected power electronic converters and bus bars change, the multi-level power electronic converter system control needs to be carried out accordingly. Model revisions.

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Abstract

The invention discloses a control method and device for a multi-stage power electronic converter system. The control method comprises the following steps: S1, constructing incidence relations of working condition parameters between power electronic converters at all stages, between buses of the power electronic converters at all stages, and between the power electronic converters and the buses of the power electronic converters at all stages; and S2, constructing a multi-stage power electronic converter system control model based on the incidence relation, and taking the maximum product of the efficiency of each stage of power electronic converter as a target and the working condition parameters of each stage of power electronic converter and the working condition parameters of the bus of each stage of power electronic converter as constraint conditions to realize dynamic planning of the working state regulation and control instruction of each stage of power electronic converter. The quick dynamic planning of the working state regulation and control instruction of each stage of power electronic converter is realized, and the safe operation of the multi-stage power electronic converter system is ensured while the maximum electric energy conversion efficiency of the multi-stage power electronic converter can be realized.

Description

technical field [0001] The invention relates to the field of power electronic converter control, in particular to a control method and device for a multi-stage power electronic converter system. Background technique [0002] With the increasingly severe energy problems, the requirements for the power conversion efficiency of multi-level power electronic converters are getting higher and higher. At present, the efficiency of the system is mostly improved through device innovation, such as the use of power switching devices with low switching loss and low on-state impedance, and the use of magnetic devices with low core loss, which will lead to an increase in the cost of the entire system. Contents of the invention [0003] In order to solve the above problems, the present invention provides a control method and device for a multi-level power electronic converter system, which can maximize the power conversion efficiency of the multi-level power electronic converter while en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02J3/00
CPCH02M1/00H02J3/00H02J2203/20
Inventor 魏腾飞曾贤强魏祥林陈伟张宏亮金海鲜龙李康乐马玉润李晓楠王帅郭童吉
Owner LANZHOU UNIVERSITY OF TECHNOLOGY