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High-voltage frequency converter of power unit series

A high-voltage frequency converter and power unit technology, which is applied to the conversion equipment for intermediate conversion to DC conversion, and the conversion equipment that can be converted to DC without intermediate conversion. problems such as poor performance, to achieve the effect of improving characteristics and reducing costs

Active Publication Date: 2008-01-02
BEIJING LEADER & HARVEST ELECTRIC TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This insulation distance increases the core height of the transformer, wastes materials, and deteriorates the characteristics of the transformer

Method used

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  • High-voltage frequency converter of power unit series
  • High-voltage frequency converter of power unit series
  • High-voltage frequency converter of power unit series

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Embodiment Construction

[0018] The high-voltage frequency converter with power units in series disclosed in the present invention is mainly composed of a multi-secondary winding transformer on the grid side, 3×N power units and a control system. The maximum output voltage of each power unit is V, and the secondary windings of the transformer are respectively Connect the power units; every N power units are connected in series to form a phase, that is, the power units A1-AN are connected in series, the power units B1-BN are connected in series, and the power units C1-CN are connected in series. One output terminal of the three power units A1, B1, and C1 of the star-connected neutral point is connected to form a neutral point O to supply power to an AC motor or other loads.

[0019] The difference between the present invention and the existing power unit series high-voltage inverter is that the present invention improves the connection mode between the secondary winding of the transformer and the power ...

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Abstract

The invention discloses a high-voltage frequency converter with serially connected power units, which is composed of a rectifying transformer at electric network, 3*N power units, and a control system. The rectifying transformer is provided with 3*N secondary windings, which each secondary winding is connected with the input of one power unit. The maximum output voltage of each power unit is V. The invention is characterized in that the secondary windings of the rectifying transformer are divided into three groups, while each group has N windings, as Wa1 to WaN, Wb1 to WbN, and Wc1 to WcN, which are arranged sequentially. The connection sequence between one group of secondary windings and the power units is reverse to the connection sequence between other two groups with the power units. The three secondary windings connected with the power units A1, B1, and C1 have two ones nearby. Two insulation voltages between two nearby secondary winding groups have one not smaller than V and one not smaller than N*V.

Description

technical field [0001] The invention relates to a high-voltage frequency converter with power units connected in series, in particular to a high-voltage frequency converter with power units connected in series in which the connection mode between the transformer secondary winding and the power unit is improved. Background technique [0002] With the development of power electronics technology, as a product of the development of power electronics technology, frequency converters have been widely used in various fields of the national economy such as metallurgy, petrochemicals, tap water, electric power and other industries, and are playing an increasingly important role. Yes, the application of high-voltage and high-power inverters is becoming more and more extensive. The high-voltage and high-power frequency converter (as shown in Figure 2) composed of power units 1 connected in series as shown in Figure 1, as a high-voltage frequency converter suitable for China's national ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/12H02M5/44
Inventor 倚鹏
Owner BEIJING LEADER & HARVEST ELECTRIC TECH
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