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Rectifier station, high voltage direct current transmission system and method for eliminating faults

A technology for high-voltage direct current and power transmission systems, applied in the field of rectifier stations, can solve problems such as active and reactive power imbalance, AC system off-grid, power system collapse, etc., to achieve the effects of minimizing interference, wide application range and low cost

Active Publication Date: 2020-07-24
HITACHI ENERGY SWITZERLAND AG
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Problems solved by technology

However, this will cause a serious active and reactive power imbalance in the weak AC system or island system connected to the rectifier of the high-voltage DC system, and then there will be serious problems of the above-mentioned AC system off-grid, or even the collapse of the entire power system

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  • Rectifier station, high voltage direct current transmission system and method for eliminating faults
  • Rectifier station, high voltage direct current transmission system and method for eliminating faults
  • Rectifier station, high voltage direct current transmission system and method for eliminating faults

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Embodiment Construction

[0040] The present invention will be specifically described below in conjunction with the accompanying drawings and embodiments.

[0041] As described in the background technology section, how to eliminate the temporary failure of the HVDC power transmission system, avoid serious problems in the AC system, and ensure the stable operation of the system has become an important topic in this field. This issue has especially become a technical problem that needs to be solved urgently for the weak AC system or island AC system to carry out HVDC power transmission.

[0042] In general, the present invention innovatively designs the technical solution of the brake chopper installed in the rectifier station of the HVDC power transmission system. By controlling the switch, the active power is consumed by the chopper resistance. In one embodiment, the present invention can clear the DC fault through the following steps: disconnect the DC line to achieve successful ionization, temporaril...

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Abstract

The invention discloses a rectifier station for a high-voltage direct-current power transmission system, and further discloses the high-voltage direct-current power transmission system and a method for eliminating a fault of the high-voltage direct-current power transmission system. The rectifier station comprises a high-voltage direct-current rectifier, a rectifier transformer, a filter, an isolating switch, a chopper switch and a chopper resistor, wherein the high-voltage direct-current rectifier is used for converting an alternating current output by a power generation system into a direct current; the isolating switch, the chopper switch and the chopper resistor all are arranged at a direct current side of the high-voltage direct-current rectifier; the isolating switch is a normally closed switch an is connected with the high-voltage direct-current rectifier in series; the chopper switch is a normally open switch, and is connected with the high-voltage direct-current rectifier in parallel after being connected with the chopper resistor in series; and the chopper resistor is used for consuming an active power during a fault period. According to the technical scheme disclosed by the invention, the problem of direct current transmission of an overhead line of a weak alternating current system or an island is innovatively solved; the rectifier station is also applicable to other high-voltage direct-current power transmission systems; and stable operation of a power system is facilitated.

Description

technical field [0001] The invention relates to a rectifier station of a high-voltage direct current transmission system, and at the same time relates to a high-voltage direct current transmission system and a method for eliminating faults in the high-voltage direct current transmission system. Background technique [0002] With the continuous development of the world economy, the damage to the environment and climate is becoming more and more serious. Therefore, countries around the world have set goals to reduce carbon dioxide emissions. In order to achieve this goal, clean new energy sources such as wind energy and solar energy have received more and more attention from all countries in the world, and will become an important part of energy sources in all countries in the world. At present, the development and use of new energy has been vigorously developed. [0003] On the other hand, the transmission of new energy has become the biggest bottleneck in the development o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/36H02J2003/365Y02E60/60
Inventor 马茨·安德森蔡蓉谢海莲张利东
Owner HITACHI ENERGY SWITZERLAND AG
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