Comprehensive assessment normalization processing method for quality of electric energy

A power quality and comprehensive evaluation technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as the inability to evaluate the overall status of power quality intuitively, and achieve stable maintenance, power supply security and economical effects

Inactive Publication Date: 2012-02-01
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +1
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  • Abstract
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Problems solved by technology

The power quality is changing dynamically in both space and time, and it is currently impossible to directly give an intuitive evaluation of the overall situation of the power quality in the region

Method used

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  • Comprehensive assessment normalization processing method for quality of electric energy
  • Comprehensive assessment normalization processing method for quality of electric energy
  • Comprehensive assessment normalization processing method for quality of electric energy

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Embodiment Construction

[0044] In this embodiment, the present invention is mainly aimed at an evaluation method provided according to national standard grades for power quality. Change, voltage deviation, and frequency deviation are five indicators, and these five indicators are used as indicators for comprehensive evaluation of power quality, and normalized, and weights are assigned to the above five indicators, and the comprehensive evaluation is graded, and finally Determine the overall status of regional power quality. Among them, the national standard grade limits of individual indicators are as follows: figure 1 shown.

[0045] Among them, the voltage deviation and frequency deviation are adjusted to the unqualified rate according to the relevant standards of the State Grid Corporation of China. For voltage deviation, the annual power supply voltage qualification rate required by State Grid [2004] No. 203 should be over 98.0%, that is, the maximum allowable failure rate is 2%. For frequency...

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Abstract

The invention discloses a comprehensive assessment normalization processing method for the quality of electric energy. According to the method, more visual assessment for total condition of the quality of electric energy in the region can be directly given, so that power supply is more economic and safer. The method comprises the following steps of: carrying out normalization processing of single index according to 95 percent of probability value of each index of electric energy obtained by actually measuring and calculating and a standard limit of national standard level; obtaining an assessment coefficient of each index according to the normalized result; carrying out multiply operation on the assessment coefficient and a weight endowed by each index to obtain the score of the single index; carrying out additive operation on the score of the single index to obtain a comprehensive assessment score of electric energy quality; and finally, judging the total condition of the electric energy quality by combining a comparison table of the grading condition of the electric energy quality according to the comprehensive assessment score of the electric energy quality. The comprehensive assessment normalization processing method can be widely applied to the field of quality monitoring of an electric system.

Description

technical field [0001] The invention relates to a normalized processing method for comprehensive evaluation of power quality. Background technique [0002] With the rapid development of my country's economy and technology and technological progress, large-capacity power loads are increasing day by day, microelectronic devices and automated production lines composed of semiconductors and computer technologies have developed rapidly, and have widely penetrated into the production process of high-tech fields. Unqualified indicators such as voltage deviation, frequency deviation, harmonics, voltage fluctuation and flicker, and three-phase unbalance have a great impact on the production and development of various industries. [0003] The economic losses caused by the influence of power quality are becoming more and more prominent. More enterprises and power users have higher and higher requirements for power supply quality. Therefore, it is very important to improve the quality o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 李琼林杜习周刘书铭余晓鹏张晓东吴兰旭刘长树
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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