A method and system for analyzing power grid uncertain power flow

An uncertain and deterministic technology, applied in the field of uncertainty power flow analysis of power systems, can solve problems such as poor probability distribution fitting effect, and achieve the effect of overcoming the complicated calculation process, improving calculation efficiency, and avoiding non-convergence.

Active Publication Date: 2022-03-11
SHANDONG UNIV
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Problems solved by technology

[0006] In order to overcome the shortcomings of the point estimation combined with the series expansion method in the current uncertain power flow analysis, the present invention provides an improved point estimation and maximum entropy method for analyzing the uncertain power flow, and improves the calculation of the traditional method through improvement measures Efficiency, to overcome the problem of poor fitting effect of probability distribution

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  • A method and system for analyzing power grid uncertain power flow
  • A method and system for analyzing power grid uncertain power flow
  • A method and system for analyzing power grid uncertain power flow

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Embodiment 1

[0036] This embodiment discloses a method for analyzing the power grid uncertainty power flow, which can use the empirical distribution and standard normal distribution characteristics of input random variables such as wind speed, light intensity, and load to obtain sampling values ​​and corresponding weights, and then solve the Statistical characteristics of the output variables, so as to obtain the probability density function according to the principle of maximum entropy, so as to accurately describe the output random variables such as node voltage and line power flow, and realize the analysis of power system uncertain power flow.

[0037] In this implementation example, the probability density function of a random variable is an intuitive expression of its probability distribution, so the probability distribution of the output random variable to be obtained can be obtained by obtaining the probability density function, which is exactly the principle of uncertain power flow a...

Embodiment 2

[0071] This embodiment discloses a system for analyzing power grid uncertain power flow, including:

[0072] The storage device is used to store the line parameters and load parameters of the power system, the standard normal distribution and the corresponding sampling points and weights of input random variables such as node voltage and line flow, the node voltage and line flow results after each deterministic evaluation, The origin moments of each order after the weighted calculation, the corresponding parameters of the calculated probability density function and their numerical solutions;

[0073] The storage device specifically stores probability density function parameters such as wind speed, light intensity, and load.

[0074] The processor is configured as:

[0075] Receive the probability description of input random variables such as wind speed, light intensity, load, etc. in the power system, establish a model of random factors in the power system, and determine the ...

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Abstract

The invention discloses a method and system for analyzing the uncertain power flow of the power grid, including: obtaining the probability description of input random variables such as wind speed, light intensity, load, etc. of the power system, establishing a model of the random factors of the power system, and determining the required Target output variables such as node voltage and line power flow; obtain the sampling values ​​of input random variables such as wind speed, light intensity, and load, and obtain the origin moments of each order of output variables such as node voltage and line power flow according to the deterministic evaluation method; based on the origin moment Calculate the results, and use the maximum entropy probability distribution algorithm to solve the probability distribution of target output variables such as node voltage and line power flow. The present invention can effectively overcome the characteristics of complicated calculation process in the traditional point estimation method, make up for the inaccurate fitting problem inherent in the traditional point estimation and series expansion method, and has certain application value for analyzing the uncertain state of the power system .

Description

technical field [0001] The invention belongs to the technical field of power system analysis, and in particular relates to an uncertain power flow analysis method of a power system. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] With the development of the power system, a large number of new power supply and consumption devices such as renewable energy power generation, electric vehicles, etc. continue to emerge, which aggravates the uncertainty of the power system power flow, making it difficult for operators to accurately grasp the actual operating status of the power grid. In this context, research on methods for analyzing uncertain power flows in power systems has gradually attracted people's attention. [0004] Uncertain power flow refers to a power system analysis method that uses uncertain factors that affect the operating state ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/06
CPCH02J3/00H02J3/06
Inventor 孙媛媛王庆岩谢香敏李亚辉程凯强王石川许庆燊
Owner SHANDONG UNIV
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