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Transient stability probability evaluation method considering wind power correlation

A transient stability and transient stability technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of complex analytical derivation of transient stability probability, difficulty in online application, etc., to achieve high-efficiency power system probability Effect of transient stability, efficient evaluation

Inactive Publication Date: 2019-05-17
TIANJIN UNIV
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Problems solved by technology

Due to the uncertainty of various variables and the randomness of wind power output, the derivation of the transient stability probability analytical formula is more complicated
In addition, time-consuming MC simulation is usually used to obtain the probability index, which also makes the method difficult to realize online application

Method used

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  • Transient stability probability evaluation method considering wind power correlation
  • Transient stability probability evaluation method considering wind power correlation
  • Transient stability probability evaluation method considering wind power correlation

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Embodiment Construction

[0033] A method for evaluating the probabilistic transient stability of a power system considering wind power correlation according to the present invention will be described in detail below in conjunction with implementation examples and accompanying drawings.

[0034] A probabilistic transient stability evaluation method considering wind power correlation of the present invention, its essence is to solve the analytical expression of the transient stability probability based on the safety domain, so the present invention proposes an improved three-point estimation method for this expression .

[0035] like figure 1 As shown, a kind of probabilistic transient stability evaluation method considering wind power correlation of the present invention comprises the following steps:

[0036] Step 1. Establish a probability model of node injection power

[0037] In the power system, the injection types of each node are different, resulting in differences in the distribution of injec...

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Abstract

The present invention proposes a simple and effective method for evaluating transient stability probability in the field of power system transient stability assessment for a power system considering wind farm uncertainty and correlation. An extended dynamic security domain method is used, and linear combination of node injection vectors is used to represent transient stability data in a given fault condition. The three-point estimation method and the Cornish-Fisher expansion method are improved to deal with uncertainty and correlation between different wind farms. A large number of simulationcalculations are performed on an improved New England system, and a result shows that calculation efficiency of the method of the present invention is significantly higher than that of a Monte Carlo method, and precision is high.

Description

technical field [0001] The invention relates to the field of power system transient stability evaluation, in particular to a probabilistic transient stability evaluation method in consideration of wind power correlation. Background technique [0002] In recent years, renewable energy represented by wind power has gradually penetrated into the power system. Different from traditional generators, the output of wind turbines is related to wind speed and is greatly affected by weather, resulting in uncertainty and correlation of the injected power of wind turbine nodes. With the integration of large-scale wind turbines into the grid, the impact of wind power on the transient stability of the power system is more significant. From the perspective of power system operation and planning, transient stability assessment methods that consider wind power uncertainties and dependencies are becoming more and more important. [0003] Most of the traditional transient stability analysis ...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 刘艳丽岳梓媛
Owner TIANJIN UNIV
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