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A method and system for connecting a hybrid direct current transmission receiving end grid

A hybrid DC transmission and receiving-end grid technology, applied in the direction of power transmission AC network, AC network with the same frequency from different sources, etc., can solve the problems of cumbersome calculations and unstable power grids in areas with multiple DC locations, and achieve calculation cumbersome effect

Active Publication Date: 2022-06-07
CEEC JIANGSU ELECTRIC POWER DESIGN INST CO LTD +2
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Problems solved by technology

[0005] In order to solve the deficiencies in the prior art, the present invention provides a hybrid direct current transmission receiving end grid access method and system, which solves the problems of instability of the grid in areas where multiple direct currents are placed and cumbersome calculations in the prior art. Quickly and effectively select the planning of hybrid DC in the power grid in the area near the drop point

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  • A method and system for connecting a hybrid direct current transmission receiving end grid
  • A method and system for connecting a hybrid direct current transmission receiving end grid
  • A method and system for connecting a hybrid direct current transmission receiving end grid

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Embodiment Construction

[0074] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, and cannot be used to limit the protection scope of the present invention.

[0075] like figure 1 As shown in the figure, a method for accessing a power grid at a receiving end of a hybrid DC transmission includes the following steps:

[0076] Step 1: Select alternative substations with HVDC access conditions; select busbars with critical power flow sections in the receiving end power grid and limited short-circuit capacity of substations;

[0077] In the first step, the key section of the power flow in the receiving end power grid is selected, specifically:

[0078] If the power flow at the receiving end grid interruption surface exceeds η times of its limited value, the section is the critical power flow section with heavy load in the receiving end power ...

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Abstract

The invention discloses a hybrid direct current transmission receiving end grid access method and system, which calculates the power flow change rate matrix of key sections and the direct current multi-infeed short-circuit ratio change rate matrix when conventional direct current is connected to different alternative substations; flexible direct current access The key section power flow change rate, the short-circuit current change rate of the restricted busbar and the busbar voltage change rate matrix of the alternative substation when different substation candidates are selected, and the above change rate matrix is ​​normalized; the optimization model of the hybrid DC access to the receiving end grid scheme is constructed, Solve the optimization model of the mixed DC connection receiving end grid scheme, and obtain the best alternative substation scheme. The invention converts the optimization problem of hybrid direct current network connection into a single function network connection optimization problem, the calculation is simpler and faster, and it can provide reference for the planning and construction of direct current transmission and its location selection in the actual power grid.

Description

technical field [0001] The present invention relates to the technical field of direct current transmission, in particular to a method and system for connecting a hybrid direct current transmission receiving end power grid. Background technique [0002] my country's energy shortage, especially in areas with heavy load, is seriously lacking in electricity, which often requires a large number of calls from outside the area. At present, the country is actively promoting the long-distance delivery of large-capacity power sources such as hydropower and thermal power to areas with heavy loads. High voltage direct current transmission (HVDC) has a good application prospect in the occasion of long-distance power transmission and grid connection. [0003] Conventional high-voltage direct current transmission (LCC-HVDC is the phase-controlled converter-based high-voltage direct current transmission) has been widely used in high-power long-distance transmission. However, the access of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/06
CPCH02J3/36H02J3/06Y02E60/60
Inventor 李金科牛涛郭学英韩志锟管永高冯士睿孙瑜万振东刘景晖乐晓蓉王莹冯大伟何悦
Owner CEEC JIANGSU ELECTRIC POWER DESIGN INST CO LTD
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