Probabilistic load flow calculation method, giving consideration to photovoltaic non-linear correlation, for power system

A probabilistic power flow calculation and power system technology, applied in the electric power field, can solve the problems of limited scope of application, failure to consider the nonlinear correlation of photovoltaic output, etc., and achieve the effect of accurate probability calculation results

Inactive Publication Date: 2018-02-09
STATE GRID GASU ELECTRIC POWER RES INST +2
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Problems solved by technology

However, this method, like the previous method, fails to consider the nonlinear correlati

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  • Probabilistic load flow calculation method, giving consideration to photovoltaic non-linear correlation, for power system
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  • Probabilistic load flow calculation method, giving consideration to photovoltaic non-linear correlation, for power system

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Embodiment Construction

[0025] The following are specific embodiments of the invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

[0026] A power system probabilistic power flow calculation method considering photovoltaic nonlinear correlation, comprising the following steps:

[0027] step one

[0028] Establish the probability model of the photovoltaic power station. According to the weighted Gaussian mixture model, the probability density function of the output of the photovoltaic power station is:

[0029]

[0030] Take the measured data of the active power output of the photovoltaic power station as the observation data X={x 1 ,x 2 ,...,x N} into formula (2) to iterate the EM algorithm,

[0031]

[0032] Calculate the unknown parameter α in the probability density function of the output of the photovoltaic power station m , μ m ,

[0033] W...

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Abstract

The invention discloses a probabilistic load flow calculation method, giving consideration to photovoltaic non-linear correlation, for a power system, and the method comprises the following steps: building a photovoltaic power station probability model; building a power sample space of a photovoltaic power station, carrying out the sampling of an output probability density function of a photovoltaic electric field through employing an LHS algorithm, and then obtaining a power sample space of the photovoltaic power station; calculating the probabilistic load flow of a photovoltaic grid-connected system, enabling all groups of sample values in the generated photovoltaic output sample space to be sequentially substituted into a load flow equation for common load flow calculation, obtaining load flow samples of all nodes and branch circuits comprising a photovoltaic grid-connected node, and obtaining a sample space of an output random variable; carrying out the probability assessment of aload flow calculation index, and obtaining the probability statistics characteristics of an output variable needed by photovoltaic grid connection and an index through a probability statistics method.The method provided by the invention enables a probability calculating result to be more accurate, and achieves the accurate description of the uncertainty of the grid-connected system under the condition that the sampling scale is smaller.

Description

technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a method for calculating the probability flow of a power system considering the nonlinear correlation of photovoltaics. Background technique [0002] In order to reduce the negative impact of environmental pollution in the process of sustainable development, it is an inevitable trend for the future development of the national power system to integrate a high proportion of renewable energy into the grid. However, the large-scale grid integration of renewable energy represented by photovoltaics has brought many uncertainties to the grid operation. Through the calculation of Probabilistic Load Flow (PLF), the statistical information of system operation characteristics (such as node voltage amplitude and phase angle, line active power and reactive power, etc.) can be obtained, and the weak link of system operation can be determined. [0003] The deterministic pow...

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/383H02J2203/20Y02B10/10Y02E10/56
Inventor 梁有珍马喜平沈渭程董开松刘秀良闵占奎杨俊刘丽娟同焕珍李志敏张光儒李臻赵耀郑翔宇王斌姜梅赵炜甄文喜魏博朱宏毅张赛陈柏旭陈明忠
Owner STATE GRID GASU ELECTRIC POWER RES INST
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