A Three-Dimensional Fault Line Selection Method Based on Stochastic Resonance and Transient Current Signals
A technology of transient current and stochastic resonance, applied in fault location, measurement of electricity, measurement of electrical variables, etc., can solve problems such as less research on power systems
Active Publication Date: 2017-12-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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The so-called stochastic resonance is a new technology with practical application value that uses the principle of stochastic resonance to enhance detection of weak signals. Its research and application have involved many disciplines such as physics, signal processing, mechanical fault diagnosis, biology, and chemistry. Relatively little research has been done in power systems
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[0106] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0107] Such as figure 1 A three-dimensional fault line selection method based on stochastic resonance and transient current signals is shown, including the following steps:
[0108] (1) When the distribution network zero-sequence voltage u 0 (t) greater than 0.15 times the bus rated voltage U N When the voltage transformer TV and the arc suppression coil are disconnected and series resonance is detected respectively, if the voltage transformer TV is disconnected, the voltage transformer TV disconnection warning is issued; otherwise, it is judged whether the arc suppression coil has series resonance, If the arc-suppression coil has series resonance, adjust the arc-suppression coil to eliminate the series resonance, otherwise it is determined that the distribution network is faulty, and at the same time start the sampling device to record th...
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The invention relates to a three-dimensional fault line selection method based on stochastic resonance and transient current signals, comprising the following steps: (1) after a fault occurs in the distribution network, record the zero-sequence current and fault phase current of each branch line fault and calculate Transient zero-sequence current and transient fault phase current (2) Perform variable-scale bistable processing on transient zero-sequence current and transient fault phase current respectively; (3) Calculate the difference between transient characteristic zero-sequence currents of each branch line The cross-correlation coefficient matrix M and the comprehensive correlation coefficient Mn are obtained, and the line ln with the smallest Mn is selected; (4) 7-layer db10 wavelet packet decomposition is performed on the transient characteristic phase current of each branch line, and the simplified energy and simplified center of gravity frequency are calculated (5 ) takes the simplified center of gravity frequency as the abscissa, the simplified energy as the ordinate, and the polar parameter value as the ordinate to form a three-dimensional coordinate system. Compared with the prior art, the present invention has the advantages of high reliability, less susceptible to external interference, and the like.
Description
technical field [0001] The invention relates to a fault line selection method of a distribution network, in particular to a three-dimensional fault line selection method based on stochastic resonance and transient current signals. Background technique [0002] With the development of my country's power system, the huge power grid will inevitably cause power interruption. A power outage will cause huge losses to the national economy. Reliable and continuous power supply is the goal of my country's power system development. [0003] As an important part of the power system, the distribution network has the closest connection with users and the most direct impact on users. The 3-60kV distribution network in my country widely adopts the non-effective neutral point grounding method, also known as the small current grounding system, and most of the faults in the small current grounding system are single-phase grounding faults. When a single-phase ground fault occurs, the ground...
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IPC IPC(8): G01R31/08G01R31/02
Inventor 程启明高杰张宇谭冯忍余德清
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER