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Sensitive device immunity estimation method based on multiple sag threshold values and duration time

A sensitive equipment, duration technology, applied in the direction of measuring devices, instruments, measuring electricity, etc., can solve the problems of inaccuracy and over-evaluation

Active Publication Date: 2014-05-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for evaluating immunity of sensitive equipment based on multiple sag thresholds and duration, and propose a new description method for voltage sags based on multiple sag thresholds and durations in combination with equipment voltage tolerance curves, aiming at Applied to the evaluation of equipment immunity to solve the problems of over-evaluation and inaccuracy of traditional methods

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  • Sensitive device immunity estimation method based on multiple sag threshold values and duration time
  • Sensitive device immunity estimation method based on multiple sag threshold values and duration time
  • Sensitive device immunity estimation method based on multiple sag threshold values and duration time

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Embodiment Construction

[0050] In order to make the purpose, technical scheme and advantages of the present invention more clear, the following will combine the voltage sag recording data of a certain power quality monitoring system in my country, and take the site evaluation method for the voltage sag immunity of sensitive equipment proposed by the present invention as an example , to evaluate four typical sensitive devices, namely Logic Programmer (PLC), Adjustable Speed ​​Device (ASD), AC Relay (AC Relay), and Personal Computer (PC). It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0051] Step 1: Calculate the root mean square value of the sag recorded wave data to obtain the RMS waveform of the sag.

[0052] Any voltage U during the sag c can be described as t=s -1 (U), two solutions t can be obtained according to the RMS waveform data c1 , t c2 ,. Then T(U c )=|t c1 -t c2 |Where 0.1≤U c ≤0...

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Abstract

The invention discloses a sensitive device immunity estimation method based on multiple sag threshold values and the duration time, and pertains to the technical field of electric energy quality analysis. Effective value calculation is performed on sag recording data to obtain a sag RMS waveform, and the time T (Uc) in the sag in which the voltage is less than or equal to the voltage amplitude Uc that can be withstood by equipment are solved to form a sequence of multiple sag threshold values and the duration time; the sag description matrix, sag description table and sag description graph of some station are formed; single sag accident estimation and sensitive device voltage sag immunity station estimation are performed; and voltage sag severity estimation is performed based on the provided severity overall indicator MMDSI. The method has the following advantages that voltage sag is described based on the multiple sag threshold values and the duration time, and through the provided novel sensitive device voltage sag immunity estimation method, problems of excessive estimation and inaccuracy with traditional methods can be solved, the severity of voltage sag can be estimated reasonably.

Description

technical field [0001] The invention belongs to the technical field of power quality analysis, in particular to a method for evaluating immunity of sensitive equipment based on multiple sag thresholds and durations. Background technique [0002] Voltage sag refers to a power quality event in which the root mean square value of the voltage drops suddenly in a short period of time due to short-circuit faults in the power system, large-scale motor startup, and transformer excitation inrush current. [0003] The evaluation of voltage sag is mainly to process the sag recording data of the power quality monitoring system, and obtain the relevant index value to describe the severity of single event, site and system voltage sag and its impact on electrical equipment. The impact of voltage sag on sensitive equipment refers to the immunity of sensitive equipment to voltage sag from the perspective of sensitive equipment. The evaluation work is mainly based on the voltage withstand cur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 徐永海孔祥雨兰巧倩
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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