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A method and system for planning UHV DC external transmission grids suitable for new energy sources with high penetration rates

An ultra-high voltage DC and power grid planning technology, which is applied in AC network circuits, circuit devices, and single-network parallel feeding arrangements, etc., to achieve the effect of good practical guiding significance and application value, good computability and wide adaptability

Active Publication Date: 2021-09-28
CHINA ELECTRIC POWER RES INST +3
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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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  • A method and system for planning UHV DC external transmission grids suitable for new energy sources with high penetration rates
  • A method and system for planning UHV DC external transmission grids suitable for new energy sources with high penetration rates
  • A method and system for planning UHV DC external transmission grids suitable for new energy sources with high penetration rates

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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. Such as 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, accountin...

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Abstract

The invention discloses a method for planning a UHV DC external power grid suitable for new energy sources with high permeability, which includes: building simulation data by using power system calculation and analysis software according to the information of the power grid at the sending end and the information of multiple new energy plants and stations; Carry out power flow balance calculations for each partition of the sending-end grid separately, determine the candidate area for the sending-end DC drop point; determine at least one UHV DC drop-off point of the sending-end grid and the corresponding access planning scheme; establish The typical operation mode of the sending-end power grid; for each access planning scheme, evaluate the security and stability of the sending-end AC-DC hybrid power grid under the operation mode of the sending-end power grid, and judge whether it meets the N‑1 fault criterion; Analyze and improve the access planning schemes that do not meet the N-1 fault criterion; conduct a multi-angle comprehensive evaluation of each access planning scheme, and determine the optimal grid planning scheme based on the evaluation results.

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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Patent Type & Authority Patents(China)
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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