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Method of probabilistic load flow calculation for power system based on scene reduction

A probabilistic power flow calculation and power system technology, applied in the field of power flow calculation, can solve problems such as large data fluctuations, and achieve the effects of ensuring calculation accuracy, improving solution efficiency, and reducing calculation errors.

Active Publication Date: 2017-10-20
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology

[0008] The purpose of the present invention is to provide a power system probabilistic power flow calculation method based on scene reduction, so as to reduce the problem that the probability power flow calculation accuracy decreases when the proportion of random factors in the power grid is high and the data fluctuation is large.

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  • Method of probabilistic load flow calculation for power system based on scene reduction
  • Method of probabilistic load flow calculation for power system based on scene reduction
  • Method of probabilistic load flow calculation for power system based on scene reduction

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0044] 1. Generation and reduction of scenes and formation of scene sets

[0045] 1) Scene generation

[0046] First you need to generate the database. The optimization expectation model with random variables can be expressed by the expected value model of convex stochastic optimization in the following form:

[0047]

[0048]When the decision-maker pursues the optimal expectation of the objective function according to the actual situation, the random vector parameter ω in formula (2) will be transformed into a discrete random number that may be realized (or observed) in the future. The number obeys the probability distribution of the random vector parameter ω, and the discrete random number here is the "scene".

[0049] In practical engineering problems, the original probability measure P is composed of continuous or many discrete scene...

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Abstract

The invention provides a method of probabilistic load flow calculation for a power system based on scene reduction. The method includes the steps of performing Monte Carlo sampling on random factors such as fans, photovoltaic energy, energy storage devices and controllable loads in a power system to obtain the operating state of the power system and to construct an initial scene library; reducing the initial scene library using a fast forward selection method to filter out typical scenes, completing the classification of the scenes and generating scene sets; on this basis, carrying out probabilistic load flow calculation for each scene set using a semi-invariant method to obtain probability distribution characteristics of the state quantity of a power grid; and overlapping the load flow characteristics of each scene set to obtain the overall load flow distribution characteristics of the power grid. The method provided in the invention can be applied to the load flow calculation of a large-scale complex power grid with a high proportion of renewable energy and can effectively solve the problem of a precision decrease in the load flow calculation result by the semi-invariant method due to the large fluctuation of the random factors in the power system, thereby ensuring the high accuracy of the probabilistic load flow calculation of the power grid.

Description

technical field [0001] The invention belongs to the field of grid planning of electric power system, and mainly relates to the power flow calculation of the power system with high proportion of renewable energy. Background technique [0002] Power grid planning is an important part of power system planning. Its work is to determine the optimal grid structure according to the load growth and power supply planning during the planning period to meet the needs of economical and reliable power transmission. Power flow calculation is an important part of power grid planning. Its main task is to determine the operating status of the entire system according to the given operating conditions and network structure, and provide basic reference and verification basis for power system planning. [0003] In recent years, with the large-scale grid connection of new energy sources such as large-scale wind energy and solar energy, as well as random factors such as energy storage and controll...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06H02J3/38
CPCH02J3/06H02J3/383H02J3/386Y02E10/56Y02E10/76
Inventor 周保荣别朝红王彤侯云婷王滔连浩然秦鹏胡源
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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