A lcc-hvdc topology with auxiliary commutation circuit

An LCC-HVDC, commutation circuit technology, applied in electrical components, power transmission AC networks, output power conversion devices, etc., can solve the problems of high equipment cost, limited application, and many additional components, and achieves fewer additional components. Improve the ability to resist commutation failure, good economic effect

Active Publication Date: 2018-08-17
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the CCC converter itself also has some problems, the existing technology also improves the CCC, but the existing technology adds too many extra devices and the equipment cost is too high, which limits its practical application

Method used

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  • A lcc-hvdc topology with auxiliary commutation circuit
  • A lcc-hvdc topology with auxiliary commutation circuit
  • A lcc-hvdc topology with auxiliary commutation circuit

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Embodiment Construction

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0023] The invention provides an LCC-HVDC topology with an auxiliary commutation circuit, which includes six valve arms of a six-pulse converter, two sets of auxiliary commutation circuits and six capacitors. Each group of auxiliary commutation circuits is composed of thyristors connected in series with a star-connected structure composed of thyristors; each group of auxiliary commutation circuits is connected in parallel with three valve arms through a capacitor, and the capacitor divides each group of auxiliary commutation circuits. It is a three-segment structure, and each valve arm is divided into two-segment structures; each group of auxiliary commutation circuits is respectively connected to the AC systems A, B, and C through a star thyristor structure. The auxiliary c...

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Abstract

The invention provides an improved LCC-HVDC topology with an auxiliary commutation circuit. The topology comprises 6 valve arms of 6 pulse converters, 2 groups of auxiliary commutation circuits and 6 capacitors. Each group of auxiliary commutation circuit is formed through connecting a thyristor and one star connection structure formed by the thyristor in series. The each group of auxiliary commutation circuit is connected in parallel with the 3 valve arms through the capacitors. The capacitors divide the each group of auxiliary commutation circuit into three segments of structures and divide each valve arm into two segments of structures. The each group of auxiliary commutation circuit is connected to an A phase, a B phase and a C phase of an alternating current system through a star-type thyristor structure respectively. The auxiliary commutation circuits can provide an auxiliary commutation voltage for a commutation process through controlling charging and discharging of the capacitors when the alternating current system has a fault. Added extra devices are less and economy is good.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to an LCC-HVDC topology with an auxiliary commutation circuit. Background technique [0002] Since LCC-HVDC uses ordinary thyristors without self-shutoff capability as commutation components, it can only control the opening of the components, and the switching off of the components is realized by the zero crossing of the AC current every cycle. Therefore, the LCC-HVDC system requires a certain strength of the AC system to achieve commutation, which makes the LCC-HVDC objectively have the possibility of commutation failure when the AC system fails and the AC bus voltage drops. [0003] A commutation failure can have a number of very serious consequences. Commutation failure will cause problems such as DC bias of the converter transformer, overheating of the converter valve, and overvoltage. In the MIDC system, there is a strong coupling between each LCC-H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00H02J3/36
CPCY02E60/60
Inventor 赵成勇李春华蒋碧松郭春义
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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