A voltage stability probability assessment method based on scene partitioning and semi-invariant

A semi-invariant, voltage-stable technology, applied in the field of voltage stability probability evaluation based on scene partition and semi-invariant, can solve problems such as poor linearity, reduced solution accuracy of semi-invariant method, and increased linearization error.

Inactive Publication Date: 2019-05-10
STATE GRID ANHUI ELECTRIC POWER CO LTD
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Problems solved by technology

When the fluctuation range of the random variable is small, there is a good linear relationship between the variables, and when the fluctuation range is large, the linearity is poor
As the fluctuation range of high-proportion renewable energy output increases, the linearization error of the power flow equation increases, resulting in a decrease in the solution accuracy of the conventional semi-invariant method

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  • A voltage stability probability assessment method based on scene partitioning and semi-invariant
  • A voltage stability probability assessment method based on scene partitioning and semi-invariant
  • A voltage stability probability assessment method based on scene partitioning and semi-invariant

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Embodiment Construction

[0096] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0097] The invention discloses a voltage stability probability evaluation method based on scene partition and semi-invariant, and belongs to the technical field of static voltage stability analysis and control of electric power system. The present invention considers the impact of large fluctuations in renewable energy output on the calculation accuracy of the conventional semi-invariant method, and proposes a voltage stability evaluation method that takes into account the randomness of renewable energy output. The idea is as follows: first, the probability of each random variable The density funct...

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Abstract

The invention relates to a voltage stability probability assessment method based on scene partitioning and semi-invariants. The invention provides a voltage stability assessment method considering renewable energy output randomness by considering the influence of large renewable energy output fluctuation on the calculation precision of a conventional semi-invariant method, and the method comprisesthe following steps: firstly, discretizing the probability density function of each random variable to generate a plurality of initial scenes; secondly, dividing the initial scene set into a plurality of subsets by adopting a scene partitioning technology, and limiting the output fluctuation range of the renewable energy sources in each subset; thirdly, for each scene subset, calculating the probability distribution of the load margin by adopting a semi-invariant method according to the sensitivity of the load margin to the node injection power; and finally, obtaining the overall probabilitydistribution condition of the load margin according to a full probability formula. According to the method, the linearization error between the output random variable and the input random variable canbe effectively reduced, and the calculation precision of a conventional semi-invariant probability assessment method is improved.

Description

technical field [0001] The invention relates to the technical field of power system static voltage stability analysis, in particular to a voltage stability probability evaluation method based on scene partitioning and semi-invariants. Background technique [0002] With the increasing penetration of renewable energy power generation in the power system, it will inevitably have a certain impact on the voltage stability of the system. The output of renewable energy is characterized by strong random fluctuations, which makes it difficult for traditional deterministic voltage stability assessment methods to reveal the operating conditions of the system comprehensively and profoundly. Therefore, it is of great significance to study the probability assessment method of voltage stability considering the uncertainty of renewable energy output. [0003] At present, many literatures have carried out research on the probability assessment of voltage stability. Most literatures choose ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G06Q50/06
Inventor 胡晓飞汤伟吴迪杨铖
Owner STATE GRID ANHUI ELECTRIC POWER CO LTD
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