Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Electric power conversion device

A power conversion device and current technology, applied in circuit devices, output power conversion devices, electrical components, etc., can solve problems such as IGBT damage

Inactive Publication Date: 2012-10-17
HITACHI LTD
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] When the inductance of the single-phase reactor is zero, the harmonic current (hereinafter referred to as "circulating harmonic current") circulating in the three clusters due to the zero-phase harmonic voltage is excessive. large, thus becoming the cause of destruction of the IGBTs within the cluster

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electric power conversion device
  • Electric power conversion device
  • Electric power conversion device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A first embodiment of the present invention will be described.

[0050] In Embodiment 1, a delta connection CMC is realized that significantly reduces the volume and weight of a reactor (reactor) as compared with the conventional delta connection CMC.

[0051] Below, use figure 1 The overall structure of Example 1 will be described.

[0052] The power conversion device 102 interconnected with the power system 101 is composed of a transformer 103 , a common core reactor 104 , a uv-phase cluster 109 , a vw-phase cluster 110 , and a wu-phase cluster 111 .

[0053] The common core reactor 104 is composed of uv-phase windings 105, vw-phase windings 106, wu-phase windings 107, and a common iron core 108. The uv, vw, and wu-phase windings 105-107 are polarized with magnetomotive force Wound on the common core 108.

[0054] The uv phase cluster 109 and the uv phase winding 105 are connected in series. Likewise, the vw-phase cluster 110 and the vw-phase winding 106 , and the...

Embodiment 2

[0133] Next, a second embodiment of the present invention will be described.

[0134] In Embodiment 2, instead of the unit cell 112 of Embodiment 1 figure 2 ,use Figure 7 A unit cell 701 is shown with an active power supply mechanism 702 connected.

[0135] Thus, in the second embodiment, effective electric power can be received between the power system 101 and the power conversion device 102 .

[0136] Hereinafter, the overall structure of Embodiment 2 will be described.

[0137] In Example 2, in figure 1 In the power conversion device 102 shown, the M unit cells 112 included in each of the clusters 109 to 111 are configured to be figure 2 The unit cell shown is replaced by Figure 7 A unit cell 701 is shown with an active power supply mechanism 702 connected thereto.

[0138] In addition, the whole structure is the same as that of Example 1 except for this point.

[0139] Below, refer to Figure 5 Control when the power conversion device 102 receives active power ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Provided is an electric power conversion device which eliminates the need for large-capacity heavy single-phase reactors of previous delta connection cascade multilevel converters (CMCs), where the delta connection CMCs are formed by delta connection of three single-phase converters. Disclosed is an electric power conversion device provided with a formation of three delta-connected strings of series-connected windings and clusters, where the clusters are comprised of one or a plurality of cascade-connected single cells, and a common iron core reactor is formed by the three windings coiled around a common iron core such that their magnetomotive force provides additive polarity.

Description

technical field [0001] The present invention relates to a power conversion device, in particular to a three-phase converter formed by delta-connecting three single-phase converters. Background technique [0002] A delta junction cascade multilevel converter (hereinafter referred to as "CMC") is capable of outputting the above-mentioned A circuit system with a voltage higher than the withstand voltage of the switching element. According to [Non-Patent Document 1], the delta-connection CMC is configured by delta-connecting three clusters, which are series bodies of a plurality of unit cells, and series bodies of single-phase reactors. [0003] According to [Non-Patent Document 1], each unit cell is a single-phase full-bridge circuit including a switching element and a DC capacitor. The unit cell outputs a DC capacitor voltage, a voltage of the reverse polarity of the DC capacitor voltage, or zero voltage by controlling ON / OFF of the switching element. [0004] Since each cl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/49
CPCH02J3/1857H02M7/49Y02E40/26H02M2007/4835Y02E40/20H02M1/0064H02M7/4835
Inventor 井上重德加藤修治
Owner HITACHI LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products