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LCC/VSC DC interconnection transformer

A DC interconnection and transformer technology, which is applied in the direction of converting AC power input to DC power output, power transmission AC network, output power conversion device, etc., can solve the problems of inapplicability and inability to achieve voltage polarity reversal, etc. The effect of reduced value, low loss, and high efficiency

Active Publication Date: 2017-03-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, because this topology only uses half-bridge sub-modules, it cannot realize voltage polarity inversion, so it is not suitable for interconnection with LCC / VSC

Method used

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  • LCC/VSC DC interconnection transformer
  • LCC/VSC DC interconnection transformer
  • LCC/VSC DC interconnection transformer

Examples

Experimental program
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Effect test

Embodiment 1

[0038] When the LCC-HVDC is in the normal power flow condition, its working voltage is +U dc2 . In this operating mode, the sub-module FBSM of chain module string 1 1 ~FBSM n Middle S 3 and S 4 All latched, and S 3 bypassed by the bypass switch, at this time the FBSM 1 ~FBSM n actually translates to HBSM. Simultaneously chain submodule FBSM of module string 1 (n+1) ~FBSM (2n) All are bypassed by the bypass switch, so the chained module string 1 is converted from 2n FBSMs to n HBSMs to reduce the conduction loss and improve the efficiency of the LCC / VSC DC interconnection transformer. At this time, the running waveform is as follows image 3 As shown, let the chained module strings 1 and 2 work in the two-level PWM mode, the switching period is T, and the duty cycle is (1-d) and d respectively. Chain module string 1 output voltage u Cl1 Relative to the chained module string 2 output voltage u Cl2 There is a phase shift, and the duty cycle of the phase shift is d s...

Embodiment 2

[0040] When the LCC-HVDC is in the reverse flow condition, its working voltage is -U dc2 , at this time all FBSMs in chained module string 1 are put into operation. The operating waveform at this time is as follows Figure 4 shown.

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Abstract

The invention provides an LCC / VSC DC interconnection transformer which comprises an upper leg, a lower leg and a central connecting inductor Lf. One end of the upper leg is connected with one end of the lower leg and one end of the central connecting inductor Lf. The other end of the central connecting inductor Lf and the other end of the lower leg form the connecting of a VSC-HVDC. The other end of the upper leg and the other end of the lower leg form the connecting end of an LCC-HVDC. The upper leg comprises a leg inductor La and 2n FBSM modules which are successively connected in series. The lower leg comprises n HBSM modules which are successively connected in series, wherein n is a natural number which is larger than or equal to one. The LCC / VSC DC interconnection transformer provided by the invention has advantages of lower switching frequency, lower AC circulation and lower loss. Furthermore, when the LCC-HVDC works in a reverse flow working current, polarity reversal along with change of LCC-side voltage can be realized.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to an LCC / VSC direct current interconnection transformer. Background technique [0002] The distribution of energy resources and load centers in my country is extremely uneven. In order to meet the needs of large-scale long-distance power transmission, my country has built a large number of high-voltage direct current transmission systems (Line Commutated Converter-High Voltage Direct Current, LCC- HVDC). On the other hand, with the massive access of renewable energy such as wind energy and solar energy and the increasing demand for grid flexibility, the flexible direct current transmission system (Voltage Source Converter-High Voltage Direct Current, VSC-HVDC) based on voltage source converters get rapid development. Combined with my country's national conditions, the future development direction of my country's power grid is to use VSC-HVDC transmission techno...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M7/5395H02J3/36
CPCY02E60/60H02M7/53873H02J3/36H02M7/5395
Inventor 蔡旭游洪程
Owner SHANGHAI JIAO TONG UNIV
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