Equivalent Modeling Method for Electromagnetic Transient Simulation of AC/DC Hybrid Power Grid

An electromagnetic transient simulation, AC and DC hybrid technology, applied in the field of value modeling, can solve the problems of inapplicable transient analysis, difficulty in building models, long calculation time, etc., to achieve improved efficiency, no need for complex calculations, and matrix dimensions small effect

Inactive Publication Date: 2016-08-17
HUAZHONG UNIV OF SCI & TECH +3
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  • Abstract
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  • Claims
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Problems solved by technology

The power grid model of a large-scale network generally only has models such as PSASP or BPA, which are not suitable for transient analysis. Moreover, it is difficult to build a large-scale power grid model in the power system electromagnetic transient simulation software, and the calculation time is long

Method used

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  • Equivalent Modeling Method for Electromagnetic Transient Simulation of AC/DC Hybrid Power Grid
  • Equivalent Modeling Method for Electromagnetic Transient Simulation of AC/DC Hybrid Power Grid
  • Equivalent Modeling Method for Electromagnetic Transient Simulation of AC/DC Hybrid Power Grid

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Embodiment

[0085] Taking the East China Power Grid in the Sanhua Power Grid as an example, in order to study the action characteristics of the relay protection devices at the UHV nodes in the East China Power Grid, the UHV lines in the East China Power Grid are taken as the research object, and BPA is used to perform equivalent values ​​for the external network. Use PSCAD to construct the equivalent model.

[0086] An equivalent modeling method for electromagnetic transient simulation of an AC / DC hybrid power grid, comprising the following steps:

[0087] (1) Take the UHV lines in the East China Power Grid as the research object, search for the third-level nodes as the internal network, and finally determine the internal network such as figure 2 shown. The internal network is detailed as follows:

[0088] (1.1) Starting from the Xuzhou UHV busbar, all UHV nodes in the East China Power Grid are reserved as internal networks, including Nanjing, Taizhou, Suzhou, West Shanghai, North Zhej...

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Abstract

The invention provides an equivalent model method for performing electromagnetic transient simulation on an alternating current / direct current hybrid power grid. The method comprises the steps of (1) confirming an initial network, an internal network and an external network; (2) confirming an external equivalent network; (3) performing matrix calculation; (4) screening elements in node impedance matrixes; (5) modeling and checking the external equivalent network; (6) modeling and checking the internal network except the portion outside the direct current portion; (7) modeling and checking the direct current portion of the internal network. A direct current transmission line is completely retained, accurate research on performance of a relay protection device in the alternating current / direct current hybrid power grid is facilitated, and the influence of a direct current network to the relay protection device, the influence of an alternating current network to the relay protection device and mutual effects of the direct current network and the alternating current network under the breakdown condition in the alternating current / direct current hybrid power grid can be comprehensively analyzed.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to an equivalent modeling method for performing electromagnetic transient simulation on an AC / DC hybrid power grid. Background technique [0002] With the rapid development of my country's national economy and the continuous increase of electricity load, in order to improve the economy and reliability of power transmission, my country's power system has begun to develop towards multi-machine, large power grid, AC-DC combined transmission and large-area networking. Power companies in various regions must consider the influence of other regions on their own region when conducting dynamic security analysis, but these developments have brought difficulties in off-line calculation and computer analysis. Due to the need to consider a large number of components such as governors, exciters, and loads, power system stability analysis, modeling, and control also add new difficulties. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G06F9/455
CPCY02E60/00
Inventor 文明浩尹项根朱晓彤谢华赵志伟马以文
Owner HUAZHONG UNIV OF SCI & TECH
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