An Overload Power Transmission Method for High Voltage Direct Current Transmission System

A power transmission system, high-voltage direct current technology, applied in the direction of reducing/preventing power oscillation, can solve the problems of large system impact and system instability, achieve the effect of small impact and ensure the reliability of electricity consumption

Active Publication Date: 2017-03-29
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And when the DC power is increased, it will have a greater impact on the system itself, especially when the DC power is increased rapidly, the impact on the system will be greater, which may cause system instability

Method used

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  • An Overload Power Transmission Method for High Voltage Direct Current Transmission System
  • An Overload Power Transmission Method for High Voltage Direct Current Transmission System
  • An Overload Power Transmission Method for High Voltage Direct Current Transmission System

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Embodiment 1

[0026] The transmission power of Gaozhao DC (Anshun, Guizhou-Gaoyao, Guangdong) in China Southern Power Grid is 3000MW under rated load, and the DC voltage level is ±500kV. The transmission power of Chusui DC (Chuxiong, Yunnan-Suidong, Guangzhou) is 5000MW, the DC voltage level is ±800kV. When the receiving system Guangdong needs to increase the load of 800MW on the basis of the basic load, it can choose high-speed DC or Chusui DC to increase the load. However, due to the different power grids at the sending end, it may be necessary to select different DC for power at different times. It is necessary to analyze the DC sensitivity factor of each DC, and try to choose a DC with a smaller DC sensitivity factor for power boost, but in view of some special working conditions, it is necessary to select another DC for power boost, which requires DC power Increase the speed limit to ensure the minimum impact on the grid when the DC power is increased.

[0027] figure 2 In Example 1...

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Abstract

The invention provides a overload transmission method for a high-voltage DC transmission system, and requires the placement of at least two high-voltage DC transmission systems to the same receiving-end system. The overload transmission method comprises a step A of selecting a typical generator set in the receiving-end system; a step B of raising the same DC power sequentially for the at least two high-voltage DC transmission systems on the basis of the original DC power, and respectively obtaining generator end frequency curves of the typical generator set when the DC power is raised for the high-voltage DC transmission systems; a step C of calculating a DC sensitive factor when the power is raised for each high-voltage DC transmission system; and a step D of sorting the at least two high-voltage DC transmission systems based on the magnitude of the DC sensitive factors, and selecting the DC with the smaller DC sensitive factor for power raising. According to the invention, through the analysis of the DC sensitive factors, a proper DC power raising rate is obtained, and smaller impact of the DC power raising to the system can be ensured to the greatest possibility while the reliability of the electricity utilization of a receiving-end power grid is ensured.

Description

technical field [0001] The invention relates to an overload power transmission method of a high-voltage direct current transmission system. Background technique [0002] When designing the HVDC transmission system, not only the rated power, rated voltage and rated current during normal operation must be specified, but also a certain overload capacity is required. The requirements for the overload capacity of the HVDC transmission system mainly depend on the needs of the AC system at the sending and receiving end: when the AC connection line between the AC sending and receiving end systems fails and is disconnected, in order to ensure the reliability of power consumption of the receiving end system, it is necessary to make the DC The transmission system operates under overload for a long time until the AC line resumes transmitting power. When the DC power is increased, it will have a greater impact on the system itself, especially when the DC power is increased rapidly, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24
Inventor 赵勇赵利刚李宽陈实李兴源
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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