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Flexible direct current converter valve and flexible direct current converter device

A technology of flexible direct current and converter devices, applied in the field of converter valves, can solve the problems of high on-state pressure drop of IGBT tubes, reduced volume and weight, and poor switching characteristics, and achieves reduced conduction voltage, reduced volume and weight , good switching characteristics

Inactive Publication Date: 2021-07-16
BEIJING PESIT POWER INTEGRATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the above-mentioned technical problems in the related art, the present invention proposes a flexible DC converter valve, which adopts the combination of turn-off thyristor and IGBT tube, which can improve the low switching frequency and poor switching characteristics of traditional turn-off thyristor devices. Larger buffer circuits are required, and the shortcomings of complex topology can also solve the problem of high on-state voltage drop of IGBT tubes; sub-modules use active capacitors, which can reduce capacitor ripple on the one hand, and increase capacitor voltage on the other hand. Reduce the capacitance value, thereby reducing its volume and weight

Method used

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  • Flexible direct current converter valve and flexible direct current converter device
  • Flexible direct current converter valve and flexible direct current converter device
  • Flexible direct current converter valve and flexible direct current converter device

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment one: if figure 1 , 2 As shown in and 6, a flexible DC converter valve according to an embodiment of the present invention includes several sub-modules 5, and the sub-modules 5 include a plurality of IGBT half-bridge units 1, and each of the IGBT half-bridge units 1 A DC capacitor 3 and an active capacitor 2 are respectively connected in parallel. The IGBT half-bridge unit 1 includes a first half-bridge circuit composed of a plurality of IGBT tube connections. The first half-bridge circuit is connected in parallel with capacitors. The intermediate points of all the first half-bridge circuits in the module 5 are connected to each other to form the output terminals of the sub-modules 5 , and the output terminals of all the sub-modules 5 are connected in series.

[0035] Wherein, the number of the IGBT tubes is two.

[0036] Wherein, each of the IGBT tubes is connected in parallel with a diode.

[0037] Wherein, all the IGBT half-bridge units 1 are arranged in...

Embodiment 2

[0053] Embodiment two: if figure 1 , 3 As shown in and 6, a flexible DC converter valve according to an embodiment of the present invention includes several sub-modules 5, and the sub-modules 5 include a plurality of IGBT half-bridge units 1, and each of the IGBT half-bridge units 1 A DC capacitor 3 and an active capacitor 2 are respectively connected in parallel. The IGBT half-bridge unit 1 includes a first half-bridge circuit composed of a plurality of IGBT tube connections. The first half-bridge circuit is connected in parallel with capacitors. The intermediate points of all the first half-bridge circuits in the module 5 are connected to each other to form the output terminals of the sub-modules 5 , and the output terminals of all the sub-modules 5 are connected in series.

[0054] Wherein, the number of the IGBT tubes is two.

[0055] Wherein, each of the IGBT tubes is connected in parallel with a diode.

[0056] Wherein, each of the IGBT tubes is also connected in para...

Embodiment 3

[0063] Embodiment three: as Figure 4-6 As shown, a flexible DC converter valve according to an embodiment of the present invention includes several sub-modules 5, and the sub-modules 5 include a plurality of IGBT half-bridge units 1, and each of the IGBT half-bridge units 1 is connected in parallel There are DC capacitors 3 and active capacitors 2. The IGBT half-bridge unit 1 includes a first half-bridge circuit composed of a plurality of IGBT tube connections. The first half-bridge circuit is connected in parallel with capacitors. Each of the sub-modules 5 The intermediate points of all the first half-bridge circuits are connected to each other to form the output terminals of the sub-modules 5, and the output terminals of all the sub-modules 5 are connected in series.

[0064] Wherein, the number of the IGBT tubes is four.

[0065] Wherein, the sub-module 5 also includes a thyristor half-bridge unit 4, and the thyristor half-bridge unit 4 includes a second half-bridge circu...

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Abstract

The invention discloses a flexible direct-current converter valve and a flexible direct-current converter device. The flexible direct-current converter valve comprises a plurality of sub-modules; each sub-module comprises a plurality of IGBT half-bridge units; each IGBT half-bridge unit is connected in parallel with a direct-current capacitor and an active capacitor; each IGBT half-bridge unit comprises a first half-bridge circuit formed by connecting a plurality of IGBTs, the first half-bridge circuit is connected with a capacitor in parallel; and the middle points of all the first half-bridge circuits in each sub-module are connected with one another to form the output end of the sub-module, and the output ends of all the sub-modules are connected with one another in series. The device is high in efficiency;the IGBTs and turn-off thyristors are controlled through a driving circuit by utilizing the characteristics that the turn-off thyristors are low in conduction voltage drop and the IGBTs have good switching performance, and the defects that a traditional turn-off thyristor device is low in switching frequency and poor in switching characteristic, needs a large buffer loop and is complex in topology are overcome.

Description

technical field [0001] The present invention relates to the technical field of converter valves, in particular to a flexible DC converter valve and a flexible DC converter device. Background technique [0002] With the advancement and development of power electronics technology, flexible DC transmission will show its unique advantages in solving long-distance, large-capacity power transmission, access to new energy distributed power sources, and many problems faced by super-large AC-DC hybrid grids. . As a new generation of DC transmission technology, flexible DC transmission provides an effective solution for the transformation of power grid transmission methods and the construction of future grids. [0003] Existing flexible DC converter valves are usually composed of sub-modules composed of IGBT half-bridge circuits and capacitors, which have the following problems: (1) High loss. Due to the high on-state voltage drop of the IGBT tube, the converter valve has high loss. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02M7/00H02M1/088H02M1/34H02M1/15H05K7/20
CPCH02M7/797H02M7/003H02M1/088H02M1/34H02M1/15H05K7/20927H02M1/0054Y02E60/60
Inventor 赵海军谢广峰
Owner BEIJING PESIT POWER INTEGRATION TECH CO LTD