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Method for analyzing stochastic stability of electric power system containing wind electricity

A power system and stability technology, applied in the field of power systems, can solve problems such as the inability to accurately analyze the impact of random disturbances on power systems containing wind power

Inactive Publication Date: 2014-07-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for analyzing the random stability of a wind power system, which includes the following step:

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  • Method for analyzing stochastic stability of electric power system containing wind electricity
  • Method for analyzing stochastic stability of electric power system containing wind electricity
  • Method for analyzing stochastic stability of electric power system containing wind electricity

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Embodiment Construction

[0063] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings.

[0064] A kind of method that the present invention is used to analyze the stochastic stability of the power system containing wind power, especially for the power system containing wind power considering the uncertainty of the state matrix, the analysis of its stochastic stability mainly includes the following steps:

[0065] Step 1, system modeling; based on stochastic differential equations, the random disturbances existing in the system are modeled, and a time-varying parameter dynamic model of the power system is established;

[0066] Step 2, the definition of stochastic stability, from a practical and theoretical point of view to give an applicable definition of stochastic stability;

[0067] Step 3. Stochastic stability criterion of power system, using stochastic differential equation theory, Ito formula, and stochastic Lyapunov energy function method to fi...

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Abstract

The invention belongs to the field of power systems, and particularly relates to a method for analyzing the stochastic stability of an electric power system containing wind electricity. The method includes the steps that a stochastic differential equation is used for conducting modeling on stochastic disturbance existing in the system, an applicable stochastic stability definition is provided, the stochastic differential equation theory, an Ito formula and a stochastic Lyapunov energy function method are used for finding out a practical stochastic asymptotically mean square stability criterion, and a stochastic stability criterion of a system with uncertain state matrix parameters is derived. According to the method, the essence of the stochastic stability can be revealed more accurately, the defect that a deterministic analysis method is not accurate enough can be overcome, a model can be made to be more accurate, and a new theory and a new method can be provided for improving system control; the stochastic stability definition suitable for a electric power time-varying parameter system is provided from the point of a stochastic system is provided; a practical stability criterion of a stochastic time-varying parameter system of the electric power system is provided; compared with other methods, the method has conciseness and practicability.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for analyzing the random stability of a power system including wind power. Background technique [0002] There are a large number of random disturbances in modern power systems, which affect system stability and power quality to varying degrees. Traditional power system stability analysis is mostly carried out under the given system operating state, component parameters, and disturbance mode. Ordinary differential equations are used to describe the system dynamic behavior, and the stability is analyzed by solving the characteristic roots of the state equation. For a large number of random disturbance phenomena in the system, such as random fluctuations of load, random vibration of prime mover torque, random oscillation of power angle in interconnected large power grids, random changes of wind speed in wind power generation, etc., methods of probability and statis...

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Application Information

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IPC IPC(8): H02J3/00
Inventor 周明元博李庚银
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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