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Method for analyzing ultra-high voltage direct current system lockout caused by lightning stroke of electric transmission line

A technology of UHV DC and transmission lines, which is applied in the field of power systems, can solve problems such as the influence of lightning traveling wave protection action characteristics that cannot be considered, and achieve the effect of reducing system operation risks and improving operation reliability

Active Publication Date: 2014-01-22
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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Problems solved by technology

[0004] The purpose of the present invention is to propose an analysis method for blocking of the UHV DC system caused by lightning strikes on the transmission line. The present invention overcomes the defect that the impact of lightning traveling waves on the protection action characteristics cannot be considered in the current DC line protection check calculation.

Method used

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  • Method for analyzing ultra-high voltage direct current system lockout caused by lightning stroke of electric transmission line
  • Method for analyzing ultra-high voltage direct current system lockout caused by lightning stroke of electric transmission line
  • Method for analyzing ultra-high voltage direct current system lockout caused by lightning stroke of electric transmission line

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Embodiment Construction

[0036] The method is described in detail with reference to the accompanying drawings:

[0037]1) By sorting out and analyzing the actual recorded waveforms of UHVDC lightning strike blocking, the waveform characteristics of pole line voltage and pole line current of converter stations at both ends and the action characteristics of DC line protection during lightning strike blocking are summarized.

[0038] 2) Establish a lightning strike line simulation calculation model for the UHV DC transmission system including converter stations at both ends and transmission lines with a length of thousands of kilometers. The thousands of kilometers of direct current transmission line is divided into many small sections according to a certain length X. Each small section uses a transmission line model whose parameters vary with frequency to establish a four-conductor transmission system for simulation. Both ends of each small section are connected. A module based on diode switched capacit...

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Abstract

The invention discloses a method for analyzing ultra-high voltage direct current system lockout caused by a lightning stroke of an electric transmission line. The method comprises the first step of summarizing electric quantity characteristics and direct current circuit protection action characteristics in the lightning stroke lockout process, the second step of establishing an ultra-high voltage direct current system lightning stroke simulation model, the third step of establishing a converter station measuring system simulation model, the fourth step of establishing a control system and circuit protection simulation model, the fifth step of combining the three simulation models to form a closed loop real-time simulation system, and the sixth step of studying the ultra-high voltage direct current lockout situation caused by the lightning stroke by utilizing the simulation system. A lightning stroke simulation modeling method of an ultra-high voltage direct current power transmission system in a circuit with the length reaching to thousands of kilometers is put forward, the coupling real-time simulation of the lightning stroke simulation model and the circuit protection simulation model is achieved, and an effective means is provided for studying the ultra-high voltage direct current system lightning stroke lockout mechanism and optimizing the direct current transmission line protection definite value.

Description

technical field [0001] The invention relates to an analysis method for studying the blocking mechanism of an ultra-high voltage direct current system caused by a lightning strike on a power transmission line, belonging to the technical field of electric power systems. Background technique [0002] In the modern power system, high-voltage direct current transmission is mostly used for long-distance transmission of electric energy, which is the main implementation method of my country's west-to-east power transmission strategy, and UHV direct current transmission is being used by more and more people due to its large transmission capacity and low loss. used in DC projects. The length of the UHV DC line is relatively long, and the terrain and meteorological conditions in the areas along the line are complex, and it is easy to be blocked by lightning strikes, which brings severe challenges to the safe and stable operation of the system. Yunguang UHVDC is the world's first UHVDC ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02E60/76Y04S40/22Y02E60/00
Inventor 贾磊蔡汉生陈喜鹏胡上茂刘刚
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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