Hybrid high voltage direct current power transmission system suitable for wind power delivery

A high-voltage direct current (HVDC) and power transmission system technology, applied in wind power generation, power transmission AC network, single-grid parallel feeding arrangement, etc. The fault removal is not timely, the suppression effect is good, and the effect of preventing off-grid accidents

Active Publication Date: 2018-01-09
HEFEI UNIV OF TECH
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Problems solved by technology

[0005] In order to avoid the problems in the above-mentioned prior art, the present invention provides a hybrid high-voltage direct current transmission system suitable for wind power transmission to solve the problem that the existing LCC-HVDC cannot stabilize the AC bus voltage at the sending end when the direct current is blocked. At the same time, solve the problem that the MMC side cannot self-clear the DC side fault

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  • Hybrid high voltage direct current power transmission system suitable for wind power delivery
  • Hybrid high voltage direct current power transmission system suitable for wind power delivery
  • Hybrid high voltage direct current power transmission system suitable for wind power delivery

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Embodiment Construction

[0058] figure 1 The topology of the hybrid HVDC transmission model suitable for wind power transmission is shown, including the AC system at the sending end, the converter transformer at the sending end, the MMC converter station at the rectification side, the bipolar DC line, the hybrid HVDC circuit breaker, positive and negative pole grounding capacitor, inverter side LCC converter station, receiving end converter transformer, receiving end AC busbar reactive power compensation device and receiving end AC system.

[0059] In this embodiment, the hybrid HVDC transmission system suitable for wind power transmission is set as follows:

[0060] Such as figure 1 As shown in the figure, at the sending end of the transmission system, a three-phase infinite voltage source is connected to the rectification side converter station, and the rectification side converter station includes the sending end converter transformer and the modular multilevel converter MMC of the half-bridge MMC...

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Abstract

The invention discloses a hybrid high voltage direct current power transmission system suitable for wind power delivery. At the transmitting end of the power transmission system, a three-phase unlimited voltage source is connected with a conversion station of a rectification side, the conversion station of the rectification side comprises a conversion transformer and a modular multilevel converter(MMC) of a half-bridge MMC sub-module. The MMC of the conversion station of the rectification side is connected with a bipolar direct current line. The bipolar direct current line is connected with ahybrid high voltage direct current circuit breaker in series. The bipolar direct current line is connected with a conversion station of an inverter side. The conversion station of the inverter side comprises a conversion transformer and a line commutated converter (LCC). The conversion station of the inverter side is connected with a receiving end alternating current system. The receiving end alternating current system adopts a three-phase unlimited grid. The system can prevent the impact of alternating current bus overvoltage caused by direct current block on wind power accessing, and can solve the fault of the direct current side automatically.

Description

technical field [0001] The invention relates to a hybrid high-voltage direct current transmission system suitable for wind power transmission, and belongs to the technical field of high-voltage direct current transmission. Background technique [0002] Since it is difficult to effectively absorb wind power resources locally, the transmission of wind power through HVDC has become a research hotspot. The traditional grid commutated converter based HVDC (LCC-HVDC) system is widely used due to its advantages of fixed power flow direction, large system transmission capacity and fast controllable active power. However, the LCC converter station needs to consume a large amount of reactive power during normal operation, and equipment such as filters for reactive power compensation takes up a large area. Especially when the DC block of the transmission system is difficult to remove the filter in a short time, the redundant reactive power will flood into the AC system, causing overvo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38
CPCY02E10/76Y02E60/60
Inventor 韩平平陈凌琦丁明张炎张海天
Owner HEFEI UNIV OF TECH
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