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Method for evaluating quality of steady state electric energy in grid-connected photovoltaic power generation system

A photovoltaic power generation system and power quality technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem that whether a single index is qualified or not can reflect the power quality as a whole

Inactive Publication Date: 2014-11-12
TIANJIN UNIV
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Problems solved by technology

However, the existing national standards only stipulate the limit value of individual indicators of power quality. However, whether the individual indicators are qualified or not can not reflect the quality of electrical energy as a whole.

Method used

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  • Method for evaluating quality of steady state electric energy in grid-connected photovoltaic power generation system
  • Method for evaluating quality of steady state electric energy in grid-connected photovoltaic power generation system
  • Method for evaluating quality of steady state electric energy in grid-connected photovoltaic power generation system

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Embodiment Construction

[0061] The combined weighting method refers to the use of the deviation maximization method to synthesize the subjective and objective weight values ​​to obtain a comprehensive weight vector.

[0062] The principal component projection method can replace the original index with an orthogonal comprehensive index through orthogonal transformation, eliminate the information overlap between the index and retain the quality information of the data of the index, and use the ideal decision vector designed by each principal component to realize each evaluation. The transformation of the data set from multi-dimensional to one-dimensional.

[0063] The technical scheme that the present invention takes is specifically:

[0064] (1) Combined empowerment method

[0065] 1. Subjective empowerment method

[0066] The basis for determining the weight of indicators by the subjective weighting method is that the decision-maker subjectively attaches importance to each indicator. The decision-mak...

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Abstract

The invention relates to the field of the quality evaluation of steady state electric energy and provides a comprehensive evaluation method for the quality of the steady state electric energy so as to perform the relatively intuitive and comprehensive evaluation on the electric energy quality of a point of common coupling (PCC) of a grid-connected photovoltaic system. The method specifically comprises the following steps: (1) integrating subjective and objective weights by adopting a combination weighting method, namely a maximum deviation method, and obtaining an integrated weight vector; (2) by adopting a main-element projection method, transforming each evaluated data group from a multidimensional manner to a one-dimensional manner by utilizing an ideal decision vector designed by each main element; and (3) performing grade interval partition, namely dividing value limiting provisions in national standard into multiple grades according to a certain standard, and determining the electric energy quality condition of data of measuring points by determining grade intervals in which data to be evaluated are positioned. The method is mainly applied to evaluating the quality of the steady state electric energy.

Description

technical field [0001] The invention relates to the field of steady-state power quality evaluation, in particular to a method for evaluating the steady-state power quality of a grid-connected photovoltaic power generation system. technical background [0002] The decline of power quality endangers the safe operation of the power system and has an adverse effect on the normal operation of electrical equipment. The global economic loss caused by the decline of power quality reaches hundreds of billions of dollars every year. With the continuous development of economy and technology, power quality issues are getting more and more attention from both suppliers and users. Each country has formulated relevant power quality standards according to the specific conditions of their own country, to provide requirements for power suppliers to provide qualified power, to provide reference for power quality-sensitive users' power selection, and to provide a basis for power quality governa...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 王继东王利鹏庞西品
Owner TIANJIN UNIV
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