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Hybrid direct current transmission system

A power transmission system, hybrid DC technology, used in power transmission AC networks and other directions

Active Publication Date: 2015-10-07
XJ ELECTRIC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a brand-new technology, the hybrid direct current transmission technology is still in the initial stage of research worldwide, and domestic research on hybrid direct current transmission technology also started relatively late. At present, there is no effective hybrid direct current transmission technology in the existing technology. system to achieve the above advantages

Method used

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Examples

Experimental program
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Embodiment 1

[0028] like figure 1 As shown, the hybrid DC power transmission system includes grid commutation converter LCC, modular multilevel converter MMC, converter transformer, AC filter bank ACF, AC reactive power compensation device group, DC smoothing reactor, DC filter DCF. LCC and MMC form a bipolar structure, and an AC filter bank ACF and an AC reactive power compensation device are also connected to the AC grid.

[0029] The AC reactive power compensation device can be a shunt capacitor, or one of a shunt reactor, a static var compensation device and a condenser. It cooperates with the AC filter bank ACF and MMC to provide reactive power compensation for the LCC.

[0030] The DC filter DCF is connected between the two DC terminals of the grid-commutated converter, the DC negative terminal of the grid-commutated converter is connected to the DC positive terminal of the modular multilevel converter, and the connection point is commutated with the grid Switches are connected in ...

Embodiment 2

[0039] The difference between this embodiment and Embodiment 1 is that in the MMC in this embodiment, at least one sub-module is a hybrid twin sub-module. like Image 6 As shown, the hybrid twin module includes 4 IGBT modules: T1, T2, T3, T4 and 2 capacitors: C1, C2, the collector of T1 is connected to the collector of T4, the emitter of T2 is connected to the emitter of T3, T1 The emitter of T2 is connected to the collector of T2, the emitter of T4 is connected to the collector of T3 through capacitor C2, the connection point of T1 and T4 is connected to the connection point of T2 and T3 with capacitor C1, and the connection point of T1 and T2 is the hybrid One port of the twin sub-module, the connection point of C2 and T4 is another port of the hybrid twin sub-module. All the IGBTs (T1, T2, T3, T4) in the hybrid twin sub-module are anti-parallel connected with freewheeling diodes, and the bases of T1, T2, T3, T4 respectively receive control signals provided by external devi...

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Abstract

The invention relates to a hybrid direct current transmission system which is in a bipolar structure and comprises a positive electrode converter transformer, a positive electrode converter, a negative electrode converter transformer and a negative electrode converter. In the bipolar structure, one converter is an MMC converter composed of an MMC sub-module, and the other is an LCC converter system which is composed of at least one LCC. The hybrid direct current transmission system provided by the invention has the advantages of mature LCC-HVDC technology, low cost, VSC-HVDC commutation failure prevention, flexible control and strong expansion performance.

Description

technical field [0001] The invention relates to a hybrid direct current transmission system, which belongs to the technical field of high voltage direct current transmission. Background technique [0002] With the development of electric power science and technology, the technology of traditional direct current transmission system (also known as grid commutated converter high voltage direct current transmission system, Line Commutated Converter Based High Voltage Direct Current, LCC-HVDC) has been very mature. The LCC-HVDC system has been widely used in submarine cable power transmission, large-capacity long-distance power transmission, and back-to-back interconnection of asynchronous power grids. However, the LCC-HVDC system has defects such as the commutation failure of the inverter station, the inability to supply power to the weak AC system, and the need to consume a large amount of reactive power during operation, which restricts its development to a certain extent. ...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 刘欣和吴金龙王先为张浩张军行登江
Owner XJ ELECTRIC
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