Assessment method of voltage sag integration severity based on energy index

A technology of voltage sag and severity, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of cumbersome evaluation process and inaccurate evaluation of sag evaluation methods, so as to improve the quality of power supply and avoid the cumbersome evaluation process. , to achieve the effect of accurate evaluation

Inactive Publication Date: 2018-06-19
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, and propose an evaluation method for the comprehensive severity of voltage sags based on energy indicators, which is used to solve the problems of inaccurate evaluation and cumbersome evaluation process of current sag evaluation methods

Method used

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  • Assessment method of voltage sag integration severity based on energy index
  • Assessment method of voltage sag integration severity based on energy index
  • Assessment method of voltage sag integration severity based on energy index

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Embodiment Construction

[0043] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] A method for evaluating the comprehensive severity of voltage sags based on energy indicators, such as figure 1 shown, including the following steps:

[0045] Step 1. Calculate the severity of the system-side voltage sag event based on the energy index. The specific method is as follows:

[0046] Step 11. If the waveform of the voltage sag event is a rectangular wave, directly use the voltage sag duration and sag amplitude to calculate the energy index of the voltage sag:

[0047]

[0048] where U(t) is the root mean square value of the time-varying voltage during the sag, U nom Is the nominal voltage; T is the duration of the sag.

[0049] Step 12. Considering that the waveform of the actual voltage sag event is non-rectangular, the energy index of the voltage sag is calculated by using the integral of the square of the sag amplit...

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Abstract

The invention relates to an assessment method of a voltage sag integration severity based on an energy index. The method is characterized by calculating a system side voltage sag event severity basedon an energy index; establishing an equipment side fault membership function based on the energy index; and establishing a voltage sag integration severity based on the energy index. In the invention,the voltage sag influences of a system side and an equipment side are integrally considered, and through the compatible relation of the two, the voltage sag integration severity is calculated. When the equipment fault membership function is calculated, a fault probability model based on the energy index is used to realize accurate assessment of the voltage sag integration severity, and problems that assessment is not accurate and an assessment process is tedious in an existing index are effectively avoided. The method is of great significance to improving power grid power supply quality, reducing economic losses and increasing a user satisfaction degree and the method is suitable for large scale assessment scenes.

Description

technical field [0001] The invention belongs to the technical field of power quality analysis, in particular to a method for evaluating the comprehensive severity of voltage sags based on energy indexes. Background technique [0002] With the increasing degree of power electronics in the power system, the problem of voltage sag is becoming more and more significant, causing huge economic losses, and has become a prominent problem in industrial electricity consumption. Reasonable and accurate assessment of the severity of voltage sags can not only be used to measure the quality of system power, but also serve as an important basis for price evaluation of power in the power market environment, and is also an important indicator for reference in the production of sensitive equipment. [0003] The existing voltage sag evaluation system can be divided into two categories: system disturbance level and equipment immunity level: one is to directly evaluate the severity of the voltag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 吕金炳卢文清李国栋刘创华刘莹胡晓辉徐永海于光耀王旭东
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO
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