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
CN107147101AActive Publication Date: 2017-09-08SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG UNIV
Publication Date
2017-09-08

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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.
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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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