Method and device for analyzing power quality of distributed power supply access grid

A technology of power quality analysis and distributed power supply, applied in the field of distribution network analysis, can solve the problems of inability to evaluate power quality indicators, and the distribution type of power quality indicators in the power grid is not given, and achieves the effect of good statistical properties.

Active Publication Date: 2017-12-22
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

However, this method only gives the average value, maximum value, minimum value and 95% probability of a single power quality, and does not give the distribution type and statistical description of the power quality index of the power grid, and cannot evaluate the power quality index beyond The probability of the limit value specified by the national standard

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  • Method and device for analyzing power quality of distributed power supply access grid
  • Method and device for analyzing power quality of distributed power supply access grid
  • Method and device for analyzing power quality of distributed power supply access grid

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Embodiment Construction

[0063] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0064] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0065] In the actual power grid, affected by power output power changes and load fluctuations, the electrical parameters that reflect power quality indicators such as voltage deviation, voltage...

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Abstract

The invention relates to a method and a device for analyzing the power quality of a distributed power supply access grid. The method includes the following steps: acquiring a sample set of power quality indexes; optimizing the width of window in a probability density function model of power quality indexes based on a kernel density function, wherein the probability density function model of power quality indexes based on a kernel density function is determined according to the sample set; and using the probability density function model of power quality indexes to determine the statistical characteristic values of power quality indexes. According to the technical scheme provided by the invention, power quality indexes are analyzed using a kernel density estimation method, a probability density distribution function of the power quality indexes is calculated based on the kernel density estimation method, and a statistical analysis is made of the power quality indexes according to the probability density function.

Description

technical field [0001] The invention relates to the field of distribution network analysis, in particular to a method and device for analyzing power quality of distributed power sources connected to a power grid. Background technique [0002] The rapid development of the national economy has put forward higher and higher requirements for the power quality of the power grid. In order to ensure the power quality, the state has promulgated relevant standards, including: power supply voltage allowable deviation, voltage fluctuation and flicker, public power grid harmonics, three-phase Voltage allowable unbalance, power system frequency allowable deviation, etc., and require the power sector to strictly implement these quality indicators. [0003] With the access of distributed power sources such as large-scale photovoltaic power generation and wind power generation, random changes in the output power of distributed power sources have a serious impact on the power quality of the ...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/001G01R31/003
Inventor 吴鸣刘海涛季宇于辉丁保迪栾文鹏李洋
Owner CHINA ELECTRIC POWER RES INST
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