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Flexible direct current active power control method for alternating current and direct current hybrid power transmission system

An AC/DC hybrid, active power technology, applied in power transmission AC networks, single AC networks with different frequencies, etc., can solve problems such as inability to achieve real-time adjustment, difficulty in operation, etc., achieve easy implementation, good control stability, Simple effect of control link

Active Publication Date: 2014-10-29
STATE GRID CORP OF CHINA +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This manual adjustment method cannot achieve real-time adjustment, which causes difficulties in operation.

Method used

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  • Flexible direct current active power control method for alternating current and direct current hybrid power transmission system
  • Flexible direct current active power control method for alternating current and direct current hybrid power transmission system
  • Flexible direct current active power control method for alternating current and direct current hybrid power transmission system

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below through specific embodiments and related drawings.

[0026] The AC-DC hybrid power transmission system uses AC lines and flexible DC lines in parallel to supply power to the grid at the receiving end. When the reverse power transmission occurs on the AC line at the receiving end due to load reduction and other reasons, this method is adopted in the active power control link of the flexible DC device. Introduce the AC line power feedback and control link to automatically adjust the transmission power of the flexible straight line, and then eliminate the power reverse of the parallel AC line, thus solving the unreasonable distribution of the power flow and network in the AC-DC hybrid transmission system. The problem of increased loss.

[0027] This embodiment provides a flexible DC active power control method for ...

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Abstract

The invention relates to a flexible direct current active power control method for an alternating current and direct current hybrid power transmission system. The flexible direct current active power control method is characterized in that the power transmission system comprises one or more flexible direct current transmission lines which are in parallel operation to one or more alternating current lines; during normal operation, the flexible direct current transmission lines are operated as per set rated active power and reactive power, and active power of the alternating current lines is not reversely transmitted by automatically adjusting active power of the flexible direct current transmission lines. According to the flexible direct current active power control method for the alternating current and direct current hybrid power transmission system, active power control requirements of a flexible direct current device can be met, linear control links are simple, and the method is simple to implement in engineering and good in control stability.

Description

technical field [0001] The invention relates to the technical field of Voltage Source Converter based High Voltage Direct Current (VSC-HVDC) in the field of power system transmission, in particular to a flexible DC active power control method for an AC-DC hybrid transmission system. Background technique [0002] Flexible DC transmission is a high-voltage DC transmission technology developed in the 1990s. It has the advantages of fast and independent control of active power and reactive power, and can supply power to passive networks. At present, more than a dozen flexible DC projects have been put into operation in the world, and my country's first flexible DC project, Shanghai Nanhui Flexible DC Transmission Project, was also put into operation in 2011. [0003] In the project put into production, such as figure 1 with figure 2 The AC-Flexible DC hybrid transmission system shown, but there are currently figure 1 with figure 2 The AC-Flexible DC hybrid transmission sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/02H02J3/36
CPCY02E60/60
Inventor 胡臻达杨晓东林章岁吴桂联
Owner STATE GRID CORP OF CHINA
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