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Power flow determination method of alternating current and direct current system containing multi-terminal high voltage direct current transmission

A multi-terminal DC transmission, AC-DC system technology, applied in the direction of power transmission AC network, etc., can solve problems such as lack of convergence

Active Publication Date: 2014-11-26
STATE GRID CORP OF CHINA +2
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the face of increasingly complex multi-segment DC systems and the application of multiple large-area interconnection scenarios, the lack of convergence of the algorithm has gradually become prominent.

Method used

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  • Power flow determination method of alternating current and direct current system containing multi-terminal high voltage direct current transmission
  • Power flow determination method of alternating current and direct current system containing multi-terminal high voltage direct current transmission
  • Power flow determination method of alternating current and direct current system containing multi-terminal high voltage direct current transmission

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Embodiment 1

[0055] Such as Figure 1-4 As shown, the invention of this example includes a method for determining the power flow of an AC-DC system with multi-terminal DC transmission, including the following steps:

[0056] (1) Decomposition of hybrid power system with multi-terminal DC transmission

[0057] Taking an m-terminal VSC-MTDC as an example, figure 1 Shown is the steady-state model of VSC-MTDC. In the figure, i represents the number of each parameter corresponding to the i-th converter station connected to the hybrid system. The AC bus of the primary winding of the converter transformer is called a special node t. u ti ,δ ti is the fundamental wave component and phase angle of the bus line voltage at a special node; U ci ,δ ci is the fundamental wave component and phase angle of the bus line voltage on the AC side of the converter; P ti , Q ti are the active and reactive power injected into the i-th converter station from the AC system, respectively; P ci , Q ci are ...

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Abstract

The invention relates to a power flow determination method of an alternating current and direct current system containing multi-terminal high voltage direct current transmission. The method includes the following steps that the hybrid power system containing multi-terminal high voltage direct current transmission is decomposed; power flow computing is conducted on sub-systems in the decomposed power system, and feature data are determined; boundary parameters of a coordination layer in the decomposed power system are amended so as to achieve global convergence. The method makes full use of the advantages of distributed parallel computing in large power network analysis computing, power flows are computed by all alternating current sub-systems separately, the feature date of sub-regions are introduced into boundary points, and the boundary parameters are amended in the direct current coordination layer to achieve global convergence. By means of the method, the convergence of power flow computing of the alternating current and direct current hybrid system is improved, the computing speed of the alternating current and direct current hybrid system is increased, and the practical level of power flow computing software in the current actual power grid and future power grid is improved.

Description

Technical field: [0001] The invention relates to a method for determining the power flow of an AC-DC system, and more particularly to a method for determining the power flow of an AC-DC system including multi-terminal direct current transmission. Background technique: [0002] With the vigorous development of high-voltage AC transmission technology and the formation of wide-area AC power grids, AC power transmission has also encountered technical bottlenecks such as its inherent system synchronization, transmission stability, and lower transmission efficiency than DC systems; at the same time, AC power grids The problem of safe operation is also becoming more and more prominent. At the same time, with the shortage of traditional energy and the aggravation of environmental degradation, countries around the world have realized that the use and development of energy must transition from traditional energy to green renewable energy and other clean energy. However, limited by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 赵昆杨逍贾育培李理陈利杰邢颖
Owner STATE GRID CORP OF CHINA
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