Ultra-high voltage direct current transmission line lightning stroke interference recognition method based on voltage relevancy and wavelet transformation transient state energy distribution characteristics
A technology of ultra-high voltage direct current and transmission lines, which is applied in the direction of measuring electric variables, measuring electricity, measuring devices, etc., and can solve the problems of protection action components being easily disturbed by lightning strikes and low sensitivity
Inactive Publication Date: 2014-01-22
KUNMING UNIV OF SCI & TECH
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The protection schemes of the two are easily affected by the transition resistance, the sensitivity is low, and the protection action elements are easily disturbed by lightning strikes
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[0071] Simulation model such as figure 1 As shown, this paper adopts the parameters of the ±800kV UHVDC transmission system, the transmission capacity of the bipolar line is 5000MW, the reactive power compensation capacity of the rectification side and the inverter side are 3000 and 4000Mvar respectively, and each pole commutation unit is two 12-pulse Converter composition. The DC filter is a 12 / 24 / 36 three-tuned filter. The line adopts the J.Marti frequency-dependent line model, and the lightning protection line is not eliminated. The total length of the line is 1500km, and there are protective installation components at the M end of the rectification side.
[0072] The length of the line is increased every 200km, and the transition resistance is 20Ω and 120Ω for simulation, taking into account the different fault conditions of counterattack non-fault, shielding non-fault, counterattack fault, shielding fault and grounding fault.
[0073] (1) When the voltage of the DC tra...
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The invention relates to an ultra-high voltage direct current transmission line lightning stroke interference recognition method based on voltage relevancy and wavelet transformation transient state energy distribution characteristics, and belongs to the technical field of power system relay protection. When voltage of an ultra-high voltage direct current transmission line fluctuates, positive voltage and negative voltage of the initial 5ms are monitored; the relevancy between voltage of each electrode and voltage of each axis is calculated, and the lightning stroke interference is recognized according to the relevancy; the recognition of fault classifications is shifted to if the interference is caused by a fault; an additional component of line modal voltage is calculated, and seven dimension decomposition is performed on the additional component by utilizing a db3 wavelet; and the ratio of high frequency energy to low frequency energy is calculated, fault categories are distinguished, and fault protection is performed. According to the method, the signal acquisition time is short, the sample acquisition scale is small, and the voltage relevancy theory is used for recognizing lightning stroke interference and fault, so that the thought is clear, and the accuracy is high; the transient state energy distribution characteristics obtained through wavelet transformation are used for recognizing lightning stroke fault and short circuit fault, and the effect is obvious; and the method is easy to implement and is not easily influenced by system parameters and transition resistance.
Description
technical field [0001] The invention relates to a method for identifying lightning strike interference of UHV DC transmission lines based on voltage correlation degree and wavelet transform transient energy distribution characteristics, and belongs to the technical field of electric power system relay protection. Background technique [0002] At present, there are mainly two schemes for traveling wave protection of HVDC transmission lines in operation: ABB and SIEMENS. The former uses pole waves to detect faults, ground mode waves are used to detect faults, and the latter uses voltage differential for traveling wave protection. constitute a criterion. The protection schemes of the two are easily affected by the transition resistance, the sensitivity is low, and the protection action elements are easily disturbed by lightning strikes. Since 2004, scholars have done a lot of research on the difference of signal time domain waveform diagram and the characteristics of high and ...
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IPC IPC(8): G01R31/00G01R31/02
Inventor 刘可真束洪春吴尉民梁松涛骆逍田鑫萃刘艇陈芝宇
Owner KUNMING UNIV OF SCI & TECH
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