Method for monitoring sudden rising or falling of voltage and monitoring device applying method

A technology of voltage swell and voltage sag, which is applied to measuring devices, measuring current/voltage, measuring electrical variables, etc., can solve problems such as complex implementation, and achieve the effects of avoiding calculations, good portability, and improving operating speed

Inactive Publication Date: 2014-09-03
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the execution of the monitoring method depends largely on the mathematical analysis model, and the execution of the method and / or the control parameters of the algorithm convergence speed need to be judged based on the engineering experience of the operator, the implementation is very complicated

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  • Method for monitoring sudden rising or falling of voltage and monitoring device applying method
  • Method for monitoring sudden rising or falling of voltage and monitoring device applying method
  • Method for monitoring sudden rising or falling of voltage and monitoring device applying method

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Embodiment Construction

[0045] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals represent the same parts.

[0046] figure 1 is a schematic flowchart of an exemplary embodiment of a method for monitoring a voltage sag or a voltage swell, which shows processing steps of the method for monitoring a voltage sag or a voltage sag.

[0047] Step S10: collecting the original signal voltage Sig0. In an exemplary embodiment of the present invention, the collected original signal voltage Sig0 of 50 Hz is converted by a digital-to-analog converter (such as AD73360), and a frequency pair of 51.2 KHz (optionally also 25.6 KHz or 12.8 KHz) is used. Original signal voltage sampling, set the time window unit of the original signal voltage to 0.32s, thus obtaining 16384 sampling points corresponding ...

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Abstract

The invention discloses a method for monitoring sudden rising or falling of voltage. The method comprises the following steps of: acquiring primary signal voltage; processing the primary signal voltage, namely determining a voltage suddenly-rising event or a voltage suddenly-falling event by calculating the root mean square value of the primary signal voltage and outputting the starting time point estimate and the finishing time point estimate of the determined event; performing wavelet decomposition on the primary signal voltage to obtain a wavelet coefficient; performing shrinking transformation on the wavelet coefficient; reconstructing the wavelet coefficient subjected to shrinking transformation; and thus obtaining accurate values of the event starting time point and event finishing time point of the primary signal voltage. The invention also provides a monitoring device applying the method for monitoring sudden rising or falling of voltage. The method and the device provided by the invention have high accuracy and are easy to operate.

Description

technical field [0001] The invention relates to a voltage swell or sag monitoring method and a monitoring device using the method, in particular to a voltage swell or sag monitoring method suitable for three-phase AC circuits and a power monitoring device using the method. Background technique [0002] In the electricity market environment, the power quality problem has been paid more and more attention by people. As the main problem of modern power quality, voltage swell / sag has been considered as one of the most important power quality problems affecting the normal and safe operation of many electrical equipment. The huge economic loss caused by voltage swell / sag has been widely concerned in the world, especially in developed countries. In order to minimize the harm of voltage swell / sag, the primary problem is to have a fast, accurate and effective method to monitor the characteristic quantity of the voltage swell / sag signal. [0003] Existing monitoring methods of chara...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/02G01R19/175
Inventor 马豫超胡飞凰俞毅刚胡喜吴剑强林顺富
Owner SIEMENS AG
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