Method and system for analyzing uncertain power flow of power grid

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

Active Publication Date: 2020-06-02
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 maximu

Method used

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  • Method and system for analyzing uncertain power flow of power grid
  • Method and system for analyzing uncertain power flow of power grid
  • Method and system for analyzing uncertain power flow of power grid

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Example Embodiment

[0035] Example one

[0036] This embodiment discloses a method for analyzing the uncertain power flow of the power grid. The empirical distribution and standard normal distribution characteristics of input random variables such as wind speed, light intensity, load, etc. can be used to obtain sample values ​​and corresponding weights, and then solve the pending The statistical characteristics of the output variables are used to obtain the probability density function based on 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 the power system uncertainty power flow.

[0037] In this example, the probability density function of a random variable is an intuitive expression of its probability distribution. Therefore, by obtaining the probability density function, the probability distribution of the random variable to be output can be obtained. This is exactly what the uncertaint...

Example Embodiment

[0070] Example two

[0071] This embodiment discloses a system for analyzing the uncertain power flow of a power grid, 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 node voltage, line power flow and other input random variables sampling points and weights, node voltages and line power flow results after each deterministic evaluation, The weighted calculation of each order of origin moments, 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 probabilistic descriptions of input random variables such as wind speed, light intensity, and load in the power system, establish a model of random factors in the power system, and...

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Abstract

The invention discloses a method and system for analyzing uncertain power flow of a power grid. The method comprises the steps of obtaining the probability description of input random variables such as the wind speed, light intensity and load of a power system, building a model of random factors of the power system, and determining to-be-solved target output variables such as node voltage and linepower flow; obtaining sampling values of the input random variables such as the wind speed, light intensity and load, and obtaining origin moments of all orders of the output variables such as the node voltage and line power flow according to a deterministic evaluation method; and based on a calculation result of the origin moments, solving probability distribution of the target output variablessuch as the node voltage and line power flow by utilizing a maximum entropy probability distribution algorithm. The method can effectively overcome the characteristic of complex calculation process ina traditional point estimation method, makes up the problem of inaccurate fitting of the traditional point estimation and series expansion method, and has certain application value for analyzing theuncertainty 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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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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