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Distribution network failure moment determining method based on multi-order wavelet function transformation

A distribution network fault and wavelet function technology, applied in the direction of the fault location, etc., can solve the problem of determining the deviation at the time of the fault, and achieve the effect of saving time and improving processing efficiency

Active Publication Date: 2018-04-17
SHANGHAI WISCOM SUNEST ELECTRIC POWER TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, if figure 1 As shown, the time t is the precise time when the fault occurs. Due to the variety of fault waveforms, if the wavelet analysis is not done properly, the determination of the fault time may be biased.

Method used

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  • Distribution network failure moment determining method based on multi-order wavelet function transformation
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  • Distribution network failure moment determining method based on multi-order wavelet function transformation

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] When a single-phase ground fault occurs, the transient current is several times or even dozens of times larger than the steady-state current. When the ground fault occurs when the phase voltage is in magnitude, the inductor current is close to zero. Therefore, the capacitor current is much larger than the compensated inductor current, and if a fault occurs when the phase voltage is the amplitude, the transient process of the neutral point ungrounded system and the arc suppression coil grounded system is similar.

[0038] When the small current grounding system is grounded in one direction, the fault current and fault voltage transient process contains rich fault information, which is several times larger than the steady state fault signal, so...

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Abstract

The invention discloses a distribution network failure moment determining method based on multi-order wavelet function transformation. The method is capable of adapting to multiple failure types and multiple failure locations and accurately positioning the failure moment. The method disclosed by the invention comprises the following steps: adopting FFT (Fast Fourier Transform) of a moving time window according to a general format (COMTRADE) waveform file exchanged by transient data of a power system collected by a failure indicator, judging aiming at the calculated distortion factor, and generally locating the failure moment, so as to save time for subsequent wavelet processing; and accurately locating failure points by adopting a method for performing wavelet transform by adopting a multi-order wavelet function. According to the method, characteristics of wavelet functions of different orders are utilized, the stability and accuracy of failure moment determination are taken into account, the effectiveness of the method is validated by analyzing various different actual failure waveforms, and reliable method supports are provided for detection of the failure indicator device.

Description

technical field [0001] The invention belongs to the technical field of distribution network fault detection, in particular to a method for determining fault time of distribution network based on multi-order wavelet function transformation. Background technique [0002] The diagnosis of distribution network faults is inseparable from the collection of complete data information. It is difficult to realize distribution network automation in suburbs and rural areas with low population density and low urbanization, and even in some urban areas. More economical and practical, and can achieve the purpose of troubleshooting, is to use the fault indicator. The location of the fault indicator is to place the fault indicator on the distribution network line. When a fault occurs, by detecting the characteristics of the fault current, the fault is located in the two devices where the fault current flows and the non-fault current flows. middle. The neutral point of my country's medium-v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 王丰凌万水
Owner SHANGHAI WISCOM SUNEST ELECTRIC POWER TECH
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