Topological structure and system for realizing independent voltage control of bipolar direct current bus

A DC bus voltage, independent control technology, applied in the direction of DC circuit above three wires, load balancing in DC network, conversion of AC power input to DC power output, etc. Problems such as voltage level and complex load types, difficulty in accurately controlling bipolar DC bus voltage, etc., achieve the effect of reducing design capacity, expanding application occasions, and simple structure

Active Publication Date: 2017-09-08
SHANDONG UNIV
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Problems solved by technology

However, the three-level converter with bipolar DC bus structure has poor adaptability, and it is difficult to meet various voltage levels and complex load types. It is urgent to solve the independent control of bipolar bus voltage based on T-type three-level converters.
[0003] Due to the mutual coupling of DC bus voltage asymmetry and load imbalance, it is difficult to accurately control the bipolar DC bus when the load is unbalanced, especially when one bus is unloaded and the other bus is loaded, resulting in extreme imbalance. DC bus voltage

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  • Topological structure and system for realizing independent voltage control of bipolar direct current bus
  • Topological structure and system for realizing independent voltage control of bipolar direct current bus
  • Topological structure and system for realizing independent voltage control of bipolar direct current bus

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. 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 application belongs.

[0034] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. 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 combinatio...

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Abstract

The invention discloses a topological structure and system for realizing independent voltage control of a bipolar direct current bus. A three-level converter topology comprises a T type three-level converter and a single-phase imbalance bridge arm; a control system comprises positive and negative direct current bus voltage control for the T type three-level converter and negative direct current bus voltage control for the single-phase imbalance bridge arm, so as to complete the independent voltage control of the bipolar direct current bus; and meanwhile, the independent control has relatively high interference resistance on a direct current load imbalance condition. The topological structure and system are simple and convenient, efficient, and easy in numeralization realization, so that the bipolar direct current bus system adopting the three-level converter can realize efficient and stable operation, and the application occasions of the three-level converter and the bipolar direct current bus structure are greatly expanded.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a topological structure and a system for realizing independent control of bipolar DC bus voltage. Background technique [0002] The T-type three-level converter with bipolar DC bus structure has the advantages of small harmonics, low switching loss, small electromagnetic interference, and uniform power loss. It is suitable for and has been widely used in high-voltage DC transmission, distributed power generation, micro-grid, AC-DC conversion place in the field of electric vehicle charging. Using the inherent split capacitance of the three-level converter to directly generate a bipolar DC bus has a simple structure, small size, and low cost, and is a research hotspot in domestic and foreign academic and industrial circles. However, the adaptability of the three-level converter with bipolar DC bus structure is poor, and it is difficult to meet various voltage levels an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/08H02J1/14H02M7/219
CPCH02J1/08H02J1/14H02M7/219
Inventor 张承慧丁文龙段彬刘家君邱涵
Owner SHANDONG UNIV
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