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A method for analyzing the effect of response characteristics of a dynamic component of a power system on transient voltage stability

A technology of dynamic components and transient voltages, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as long time consumption

Active Publication Date: 2018-12-11
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

In traditional research ideas, the time-domain simulation method is often used to analyze the influence of dynamic components on the transient stability of the system by changing system parameters, but it takes a long time

Method used

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  • A method for analyzing the effect of response characteristics of a dynamic component of a power system on transient voltage stability
  • A method for analyzing the effect of response characteristics of a dynamic component of a power system on transient voltage stability
  • A method for analyzing the effect of response characteristics of a dynamic component of a power system on transient voltage stability

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Embodiment

[0053] Such as figure 1 The flow chart of the method for analyzing the influence of the response characteristics of the dynamic components of the power system on the transient voltage stability is shown. The method for analyzing the influence of the response characteristics of the dynamic components of the power system on the transient voltage stability disclosed in this embodiment includes the following steps:

[0054] Step S1, establishing a mathematical model of the power system, and constructing an energy function expression that can reflect the system model based on Lyapunov theory. The obtained energy function expression is as follows:

[0055] U=U AC + U L1 + U L2i + U g + U R + U I + U d + U DC

[0056] in:

[0057]

[0058]

[0059]

[0060]

[0061] and have:

[0062]

[0063]

[0064] Among them, ρ i is to make B i -1 T i Positive definite parameter, and for any non-zero matrix vector, has x T B i -1 T i x>0, i=1, 2, 3;

[0065]...

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Abstract

A method for analyzing the effect of response characteristics of a dynamic component of a power system on transient voltage stability is disclosed. In order to study the main effects of generator, high voltage direct current (HVDC) and induction motor on transient voltage stability, a new analysis method is proposed from the point of view of generalized branching potential energy to study the effects of the main dynamic components on transient voltage stability. According to the distribution of transient potential energy and the information of stability margin in the post-fault network, the evaluation index is established based on the reactive power recovery characteristics of dynamic components after the fault, and the mechanism of transient voltage instability is analyzed. Finally, on the platform of MATLAB and PSAT, the three-machine nine-bus AC / DC system is simulated and tested, and the results show that the method is feasible and effective.

Description

technical field [0001] The invention relates to the technical field of impact analysis of power grid transient voltage stability, in particular to the analysis of the influence of dynamic components including high-voltage direct current transmission, generators, induction motors, etc. The stability mechanism is analyzed. Background technique [0002] As the number of DC feed-in loops of the receiving-end power grid represented by the Yangtze River Delta and the Pearl River Delta continues to increase, and the proportion of DC power feed-in continues to increase, my country's power grid will no longer be a pure AC grid, but will become a nationwide AC-DC system. Large interconnected power grids with progressively increasing complexity. Large-scale power outages due to voltage instability or voltage collapse have occurred one after another. Electric power scholars at home and abroad have to pay more and more attention to voltage stability. Compared with the traditional AC sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 杜兆斌张文倩黄昌树夏成军
Owner SOUTH CHINA UNIV OF TECH
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