DC control protection method for line ice melting of extra-high voltage DC transmission system

A DC control and protection, UHV DC technology, which is applied in the installation of DC network circuit devices, circuit devices, cables, etc., can solve problems such as being in the beginning, and achieve the effect of continuous controllable ice-melting current

Inactive Publication Date: 2009-03-11
南方电网技术研究中心 +1
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] At present, the research on deicing of UHVDC transmission lines mainly focuses on primary system design such as the series-p

Method used

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  • DC control protection method for line ice melting of extra-high voltage DC transmission system
  • DC control protection method for line ice melting of extra-high voltage DC transmission system
  • DC control protection method for line ice melting of extra-high voltage DC transmission system

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Embodiment Construction

[0023] One-time wiring schemes for UHVDC transmission line melting ice include unipolar two-converter parallel wiring and bipolar two-converter parallel wiring, etc. The following uses the unipolar two-converter parallel wiring scheme as an example to illustrate the present invention. The embodiment of the ice melting control and protection method for the UHV DC line.

[0024] The structure of the UHV DC pole control and protection system is as follows: Figure 5 As shown, it is divided into three levels: bipolar control layer, pole control layer and inverter control layer. The bipolar control layer includes BCP screen and BP screen; the pole control layer includes PCP screen and PP screen; the inverter control layer includes CCP screen and CP screen. The control and protection functions of UHV DC are realized by a series of software function modules distributed in the control and protection screens of each layer. In the present invention, by adding the program of the ice-me...

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Abstract

The invention relates to a direct-current controlling and protecting method for the ice-melting of an ultra high voltage direct current transmission line. For an once connection mode for the ice-melting of two parallel current converters, the control strategies and methods that two current converters at the rectification side are used for setting the electric current, and one of two current converters at the inversion side is used for setting the electric current, and the other one thereof is used for setting the voltage are adopted so as to ensure that an ultra high voltage direct current system can continuously and stably operates in an ice-melting operating mode. The currentration of each current converter at the rectification side is one half of the input ice-melting current instruction value and is one half of the currentration tracing line current measured value of the current converter used for setting the electric current at the inversion side, thereby the even distribution of the direct current between two current converters at the inversion side can be ensured, and the current converter used for setting the voltage at the inversion side is used for controlling the direct-current voltage of the parallel current converters.

Description

technical field [0001] The invention relates to a DC control and protection method for melting ice of UHV DC transmission system lines. More specifically, the present invention combines the characteristics of parallel connection of UHV DC converters to melt ice, and relates to a UHV DC control and protection system to meet the requirements of line melting ice Control and protection strategies and methods adopted. Background technique [0002] Icing of transmission lines in winter seriously threatens the safe operation of the power system. The increase of ice load on the conductors will cause certain mechanical and electrical damage to the conductors, iron towers and fittings. When the ice is severe, it will cause tripping, disconnection, and tower collapse, leading to power outages and causing great losses to the national economy. [0003] Heating and melting ice technology is to inject DC current into the transmission line to achieve the effect of melting ice by heating th...

Claims

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Application Information

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IPC IPC(8): H02G7/16H02J1/00
Inventor 张庆武田杰王永平傅闯李岩黎小林赵曼勇
Owner 南方电网技术研究中心
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