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Stochastic stability analysis method and system for time-delay power system based on Ito differential

A technology of power system and time-delay system, which is applied in the direction of instruments, data processing applications, calculations, etc., and can solve the problem that the time-delay power system does not consider the random factors of accessing the power system

Active Publication Date: 2015-06-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0005] In order to solve the problem that the traditional time-delay power system analysis does not consider the random factors connected to the power system, the present invention proposes a time-delay power system stochastic stability analysis method based on Ito differential, including:

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  • Stochastic stability analysis method and system for time-delay power system based on Ito differential
  • Stochastic stability analysis method and system for time-delay power system based on Ito differential
  • Stochastic stability analysis method and system for time-delay power system based on Ito differential

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Embodiment

[0114] Built based on MATLAB simulation software figure 2 The shown IEEE16-machine 68-node system examines the validity and versatility of the time-delay stochastic stability analysis considering the stochastic characteristics of the power system. The system can be divided into 5 major areas. Areas 1, 2, and 3 are equivalent systems respectively, Area 4 is the New York system, Area 5 is the New England system, and there are three tie lines between Areas 4 and 5, namely Line 1-2, Line 8-9, and Line 1 -27, where lines 1-2 and lines 8-9 are double circuit lines. The generator adopts a classic model, the excitation adopts IEEE-DC2 type excitation, and the load model is 50% constant active load and 50% constant reactive load.

[0115] 1 overload operation state

[0116] The other parameters are fixed, the overall size of the 16-unit system load is 1.2 times the rated load, and the random excitation strength is taken as 0.03 and 0.06 respectively. Substituting the state matrix ...

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Abstract

The invention relates to the field of stability analysis of power systems, in particular to a stochastic stability analysis method and system for a time-delay power system based on an Ito differential. The stochastic stability analysis method comprises the following steps: firstly establishing a Lyapunov-Krasovakii objective function considering stochastic factors and solving a weak infinitesimal generation operator of the objective function by means of an Ito differential formula; then adding a free right option constructed by a Newton-Leibniz formula in the operator to reduce the conservative property; establishing a group of linear matrix inequations on the basis and solving the maximum time delay capable of being borne by the power system considering different stochastic excitation intensities under the severe working conditions of overload, under-damping and high excitation multiple. Simulation results of an IEEE 16-machine 68-bus system verify the effectiveness and the feasibility of the stochastic stability analysis method and system, and meanwhile, conservative property analysis results show the lower conservative properties of the stochastic stability analysis method and system.

Description

technical field [0001] The invention relates to the field of power system stability analysis, in particular to a random stability analysis method and system for a time-delay power system based on Ito differential. Background technique [0002] Wide-area feedback controllers bring new opportunities for power system stability analysis, but at the same time introduce time-delay problems, and the existence of time-delays will inevitably weaken the performance of wide-area controllers, resulting in negative damping. Therefore, it is urgent An in-depth study of the time-delay stability of the system is needed. [0003] In the aspect of time-delay stability analysis, there have been many theoretical achievements, and the stability conclusions can be roughly divided into two categories: 1) Time-delay independent stability criterion. If a stability criterion does not contain a delay h t , then the stability criterion is called the delay-independent stability criterion. The time-de...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q50/06
Inventor 马静朱祥胜李益楠闫新黄天意
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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