Electric power system static security assessment method considering wind speed correlation

A power system, static security technology, applied to electrical components, circuit devices, AC network circuits, etc., can solve problems such as correlation differences, complex spatial location correlations, and difficult models

Active Publication Date: 2015-09-09
SHANGHAI JIAO TONG UNIV
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  • Description
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Problems solved by technology

However, with the increasing number of connected wind farms, there are complex spatial location correlations among a large number of stations, and there are often differences in the correlation between two stations, which is difficult to describe accurately by existing models

Method used

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  • Electric power system static security assessment method considering wind speed correlation
  • Electric power system static security assessment method considering wind speed correlation
  • Electric power system static security assessment method considering wind speed correlation

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Embodiment Construction

[0045] The method of the present invention will be specifically described below in conjunction with the accompanying drawings, but the protection scope of the present invention should not be limited thereto.

[0046] A static security assessment method for a power system considering correlation, comprising the following steps:

[0047] Step 1. Construct multi-wind field wind speeds based on truncated pair copulas (X 1 ,...,X n ) probability density model f(x 1 ,...,x n ), figure 1 It is the structure diagram of the truncated pair copula. F(·) represents a probability distribution function. F( ) can be obtained through empirical distribution, as shown in the following formula:

[0048] F ( X 1 ≤ x 1 i , ... , X n ≤ ...

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Abstract

The invention discloses an electric power system static security assessment method considering wind speed correlation. According to wind speed historical data, cut-off pair copula is used to realize wind speed modeling with non-linear correlation; then according to fan power characteristics, electric power system quick static security assessment is realized. The electric power system static security assessment method can be used for processing wind speeds with any probability characteristics in an electric power system and is suitable for quickly assessing the influence of connected wind power plants on the static security of the electric power system in medium-term and long-term plans.

Description

technical field [0001] The invention belongs to the technical field of safe and stable operation of power grids, and in particular relates to a static safety evaluation method of a power system considering wind speed correlation. Background technique [0002] Large-scale grid-connected renewable energy (such as wind power) is intermittent, random and correlated, which causes disturbances in the power system. At this time, it is necessary to consider statistical characteristics such as the correlation of disturbances, and obtain statistical information of power system operation characteristics (such as node voltage amplitude and phase angle, line active power and reactive power, etc.) through probabilistic power flow calculations, and then find weak points in system operation link to evaluate the system security level. [0003] For the modeling of correlated wind power, the third-order polynomial normal transformation and the ninth-order polynomial normal transformation are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 汪可友吴巍李国杰江秀臣韩蓓冯琳
Owner SHANGHAI JIAO TONG UNIV
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