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Planning method and system applicable to ultrahigh-voltage DC external transmission power grid containing high-permeability new energy

A technology for UHV DC and power grid planning, which is used in AC network circuits, circuit devices, single-grid parallel feeding arrangements, etc.

Active Publication Date: 2018-08-17
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention proposes a planning method and system suitable for UHV DC external transmission grids with high-permeability new energy, to solve the problem of how to determine the planning scheme for high-permeability new energy transmission grids after UHV DC access

Method used

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  • Planning method and system applicable to ultrahigh-voltage DC external transmission power grid containing high-permeability new energy
  • Planning method and system applicable to ultrahigh-voltage DC external transmission power grid containing high-permeability new energy
  • Planning method and system applicable to ultrahigh-voltage DC external transmission power grid containing high-permeability new energy

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Embodiment approach

[0119] In 2020, a provincial-level QH power grid plans to build a UHV DC transmission channel with a voltage level of ±800kV and a transmission power of 10,000MW. figure 2 It is an example diagram of the initial planning of a 750kV grid structure in a certain province according to the embodiment of the present invention. like figure 2 As shown, the 750kV main network frame of the power grid before the UHV DC connection is initially planned for 2020. The network frame diagram is divided into HX partition, DB partition and HN partition. Large-scale new energy units are connected through HX, TD, TL, HN 750kV substations The 330kV substation is connected to the grid. In 2020, the maximum load of the power grid is 11,800MW, and the total installed capacity of power is 54,604MW, including 16,372MW of hydropower, accounting for 29.98% of the total installed capacity; 5,098MW of thermal power, accounting for 9.34% of the total installed capacity; 7,105MW of wind power, accounting f...

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Abstract

The invention discloses a planning method and system applicable to an ultrahigh-voltage DC external transmission power grid containing high-permeability new energy. The planning method comprises the steps of performing simulation data building by a power system calculation analysis system according to information of a sending-end power grid and information of a plurality of new energy plant stations; performing power current balancing calculation on each division region of the sending-end power grid, and determining an alternative region of a sending-end DC drop point; determining at least onesending-end power grid ultrahigh-voltage DC drop point and a corresponding connection planning scheme; building a typical running mode of the sending-end power grid according to new energy output characteristic; estimating safe stability of a sending-end AC-DC hybrid power grid under a running mode of the sending-end power grid with regard to each connection planning scheme, judging whether (N-1)fault criterion is conformed or not; analyzing and improving the connection planning scheme which does not conform to the (N-1) fault criterion; and performing multi-angle comprehensive estimation oneach connection planning scheme, and determining optimal power grid planning scheme according to an evaluation result.

Description

technical field [0001] The present invention relates to the technical field of power system scheme planning, and more specifically, relates to a planning method and system suitable for UHV DC external transmission grids containing high-permeability new energy sources. Background technique [0002] The distribution of new energy such as wind energy and solar energy in my country is concentrated, and the distance from the load center is relatively long. At present, the large-scale consumption of new energy such as wind power and solar energy in the "Three North" region mainly relies on the long-distance transmission of UHV DC channels. [0003] With the increasing scale of new energy grid-connected, the proportion of conventional power sources has been greatly reduced. New energy sources such as photovoltaics and wind power have replaced conventional power sources such as hydropower and thermal power. Important changes have taken place in the structure of power grids at the sen...

Claims

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Application Information

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IPC IPC(8): H02J3/46
CPCH02J3/46H02J2203/20
Inventor 李媛媛张志刚苗淼吴旭张凌康宋云亭张祥成王正风张鑫刘宇伟戴长春吉平姜雪朱友良牛小荣李晓珺丁剑
Owner CHINA ELECTRIC POWER RES INST
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