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LCC-MMC (line commutated converter-modular multilevel converter) staggered and mixed bipolar direct current power transmission system

A technology of DC transmission system and DC transmission line, applied in the direction of power transmission and AC network, can solve problems such as high cost and inability to connect weak AC systems, achieve low cost and achieve the effect of decoupling control

Inactive Publication Date: 2017-09-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flexible DC transmission system based on modular multilevel converters is composed of a large number of insulated gate bipolar transistors (IGBTs) and DC capacitors, and the cost is very high.
[0005] At present, hybrid DC power transmission systems based on thyristor bridges and modular multilevel converters have also been studied. The power transmission system still needs a large number of filtering and reactive power compensation devices on the side of the thyristor bridge, which cannot be connected to the weak AC system

Method used

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  • LCC-MMC (line commutated converter-modular multilevel converter) staggered and mixed bipolar direct current power transmission system
  • LCC-MMC (line commutated converter-modular multilevel converter) staggered and mixed bipolar direct current power transmission system
  • LCC-MMC (line commutated converter-modular multilevel converter) staggered and mixed bipolar direct current power transmission system

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Embodiment Construction

[0022] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, an LCC-MMC interleaved hybrid bipolar DC transmission system includes a sending-end converter station and a receiving-end converter station; the positive pole of the sending-end converter station is controlled by an LCC (line commutated converter, line commutated converter, LCC)1, the negative pole of the converter station at the sending end is composed of MMC4; the positive pole of the converter station at the receiving end is composed of MMC3, and the negative pole of the converter station at the receiving end is composed of LCC5; the positive pole of the converter station at the sending end passes through the DC transmission line 2.1 It is connected to the positive pole of the receiving-end converter station, and the negative pole of the sending-end converter station is connected to the negative pole of the...

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Abstract

The invention discloses an LCC-MMC (line commutated converter-modular multilevel converter) staggered and mixed bipolar direct current power transmission system. The system comprises a sending end convertor station and a receiving end convertor station, wherein an anode of the sending end convertor station comprises an LCC 1, a cathode of the sending end convertor station comprises an MMC 4; an anode of the receiving end convertor station comprises an MMC 3, and a cathode of the receiving end convertor station comprises an LCC 5; the anode of the sending end convertor station is connected with the anode of the receiving end convertor station through a direct current transmission line, and the cathode of the sending end convertor station is connected with the cathode of the receiving end convertor station through a direct current power transmission line. The floor space of the LCC-MMC staggered and mixed bipolar direct current power transmission system is smaller than that of a conventional direct current power transmission system based on a thyristor and that of a flexible direct current power transmission system completely based on the MMC, and the LCC-MMC staggered and mixed bipolar direct current power transmission system can be connected with a weak alternating current system and realizes decoupling control of active power and reactive power; an unilateral diode of a direct current line can prevent three-phase short circuit current from passing by the MMC when bipolar direct current short circuit fault occurs.

Description

technical field [0001] The invention belongs to the field of direct current power transmission, in particular to an LCC-MMC interleaved hybrid bipolar direct current power transmission system. Background technique [0002] With the rapid development of large-capacity power electronic devices, a large number of grid-connected new energy power generation, and the increasing demand for asynchronous interconnection between large regional grids, HVDC technology has ushered in a new development opportunity. At present, the development of DC transmission technology in China is divided into two directions: UHV DC transmission technology based on thyristors and flexible DC transmission technology based on turn-off devices. [0003] Thyristor-based UHVDC transmission system has mature technology and rich engineering experience. The Xiangjiaba-Shanghai UHVDC transmission project, Jinping-Sunan UHVDC transmission project, and Haminan-Zhengzhou UHVDC transmission project have been put in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 胡鹏飞杨平熊静琪韩杨
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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