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Multi-terminal feed-in system for ultrahigh-voltage DC transmission

A technology of UHV DC and DC transmission lines, which is applied in the direction of AC network circuits, electrical components, circuit devices, etc., and can solve problems such as impact on the AC system at the receiving end, excessive transmission power, and power receiving at multiple points, and achieve extreme The effects of space isolation, improved reception capacity, and enhanced power stability

Inactive Publication Date: 2017-02-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a multi-terminal feed-in system for UHV DC transmission, and analyzes the problem that the excessive transmission power of UHV DC transmission in China has a relatively large impact on the AC system at the receiving end , from the perspective of the power grid structure, a polarized access method is proposed to solve the problem of multi-drop power receiving in UHV DC transmission

Method used

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  • Multi-terminal feed-in system for ultrahigh-voltage DC transmission
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  • Multi-terminal feed-in system for ultrahigh-voltage DC transmission

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] The present invention provides a multi-terminal feed-in system for UHV DC transmission, such as figure 1 As shown, the system includes:

[0039] The rectifier station is used to convert the AC power from the AC power grid at the sending end into DC power;

[0040] A direct current transmission line, used to transmit the direct current to the inverter station;

[0041] The inverter station is used to convert the direct current into alternating current and transmit it to the receiving end alternating current power grid;

[0042] The control system is used to control the rectification station and the inverter station.

[0043] Both the rectifier station and the inverter station adopt a main connection mode in which two 12-pulse converters are connected in series for each pole.

[0044] The inverter station includes a first inverter station and a secon...

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Abstract

The invention provides a multi-terminal feed-in system for ultrahigh-voltage DC transmission. The system comprises a rectifier station, a DC transmission line, an inverter station and a control system, wherein the rectifier station is used for converting AC from a sending-end AC power grid into DC; the DC transmission line is used for transmitting the DC to the inverter station; the inverter station is used for converting the DC into AC and transmitting the AC to receiving-end AC power grids; and the control system is used for controlling the rectifier station and the inverter station. According to the multi-terminal feed-in system, high-capacity DC power is transmitted to different load areas by adopting graded access topology forms of the ultrahigh-voltage DC transmission; the acceptance ability of a receiving-end AC system on the DC power is significantly improved; and the power stability during high-power transmission is strengthened. If a single pole is broken down, the influence on the other pole is very small when two receiving-end AC power grids are asynchronous AC power grids in different areas; the multi-terminal feed-in system has a good response characteristic; DC power transmission of the pole is not affected; and inter-pole isolation for a fault is achieved.

Description

technical field [0001] The invention relates to the field of power transmission, in particular to a multi-terminal feed-in system for ultra-high voltage direct current transmission. Background technique [0002] my country's energy distribution and economic development level are extremely unbalanced. In order to transmit electric energy from the Northwest and Southwest regions with relatively backward economic development level to East China and South China regions with high demand for electricity, UHV DC transmission is based on its long-distance and large-capacity The obvious advantages in the transmission of electric energy have achieved rapid development and application. At present, most of the UHV DC transmission projects are traditional line-commutated converter (LCC) type two-terminal systems, such as the Xiangjiaba-Shanghai, Jinping-Sunan, Hami-Zhengzhou ±800kV UHV DC projects that have been put into operation Power transmission project. [0003] The traditional UHV...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38
CPCH02J3/36H02J3/381Y02E60/60
Inventor 韩民晓王旌姚蜀军田春筝司瑞华唐晓骏
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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