Anomaly screening method for substation monitoring data based on waveform zero-crossing change rate
A technology for monitoring data and zero-crossing points, applied in the direction of measuring electrical variables, measuring current/voltage, measuring devices, etc., can solve problems such as the inability to detect the physical meaning of messages, and achieve the effect of improving reliability, reliability and sensitivity
Inactive Publication Date: 2017-11-17
STATE GRID CORP OF CHINA +2
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[0005] In order to solve the deficiencies in the prior art, the present invention discloses a method for discriminating abnormal monitoring data of distribution stations based on the rate of change of the waveform zero-crossing point. The disadvantages of static monitoring methods, and the horizontal blocking based on multi-interval electrical coupling also overcome the inability of existing network analyzers to detect the physical meaning of messages, and improve the reliability of abnormal monitoring
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[0023] The present invention is described in detail below in conjunction with accompanying drawing:
[0024] The single-line diagram of the power distribution system used in this embodiment is as follows figure 1 As shown, the power system is connected to three feeders through a 220 / 35kV step-down transformer, and the end of the feeder is connected to the load through a 35 / 0.69kV step-down transformer; Applied in the monitoring device of the present invention.
[0025] A method for discriminating abnormality of distribution station monitoring data based on the rate of change of waveform zero-crossing points, comprising the following steps:
[0026] Step 1: Measure the zero-sequence current value of the feeder at the fault interval of the substation (the interval number is 1), and form the sequence S of sampling values 1 [n]:
[0027] S 1 [n]=[0.5,0,-0.5,-0.75,-1.0,-1.5,-2.0,-3.25,-4.25,-5.5,-6.0,-6.75,-7.5,-8.25,-8.5,-8.75 ,-8.75,-8.75,-8.75,-8.75,-8.5,-8.5,-8.0,-7.25,-6....
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The invention discloses a method for discriminating abnormal monitoring data of distribution substations based on the change rate of waveform zero-crossing points. The invention forms a sampling series by measuring the full-cycle zero-sequence current values of feeders at different intervals in the substation; calculates its fundamental wave amplitude; and sets the detection threshold value, calculate the number of sampling points in the standardized sampling series that are smaller than the detection threshold after the waveform zero-crossing point; calculate the distortion degree coefficient of the waveform zero-crossing point change rate of feeders at different intervals; when a real fault or abnormality occurs, only the simultaneous The distortion degree coefficients of the zero-crossing point change rate of all healthy feeders are all less than or equal to 1, and the distortion degree coefficients of the faulty feeder’s waveform zero-crossing point change rate are greater than or equal to 1; otherwise, it is determined that the process layer communication of the distribution substation is abnormal. This method uses the dynamic identification of weak fault arc extinguishment / reignition near the zero-crossing point of the waveform; at the same time, it also uses the transverse electrical coupling between different intervals in the real system fault to achieve the unity of monitoring reliability and sensitivity.
Description
technical field [0001] The invention relates to the field of comprehensive automation of electric power system substations, in particular to a method for discriminating abnormality of distribution substation monitoring data based on the change rate of waveform zero-crossing point. Background technique [0002] Smart substation is a key component node of smart grid. Substations have developed from traditional substations with analog signals as the main transmission carrier to digital substations and smart substations with digital signals as the main communication medium; both primary equipment and secondary protection and control equipment in substations have undergone major changes. ; For example, new equipment such as non-traditional transformers (electronic transformers, optical transformers, etc.), merging units, and fiber-based Ethernet switches are introduced into substations. Analog signals are replaced by digital signals and optical signals. Although the anti-interfe...
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IPC IPC(8): G01R19/165
Inventor 孙学锋王涛高鹏姜杨牛林王莉马梦朝战杰
Owner STATE GRID CORP OF CHINA