Voltage sag event normalization method based on waveform characteristics

A technology of voltage sag and waveform characteristics, applied in the direction of measuring current/voltage, measuring electrical variables, computer components, etc., can solve problems such as poor identification accuracy of sag normalization, achieve improved method accuracy and strong practicability , high accuracy effect
CN112116013AActive Publication Date: 2020-12-22SICHUAN UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
SICHUAN UNIV
Publication Date
2020-12-22

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Abstract

The invention discloses a voltage sag event normalization method based on waveform characteristics. The voltage sag event normalization method comprises the following steps of S1, acquiring A, B and Cthree-phase voltage amplitudes by utilizing a voltage monitoring device; S2, filtering zero-sequence voltage of A, B and C three-phase voltage amplitudes to obtain A, B and C three-phase voltage andA, B and C three-phase line voltage; S3, judging a sag type according to the A, B and C three-phase voltage and the A, B and C three-phase line voltage; S4, according to the A, B and C three-phase voltage amplitudes, calculating the segment similarity of events of the same sag type; S5, obtaining an initial similarity set according to the segment similarity of the events of the same sag type; andmining and correcting the influence of the transformer based on the association rule, outputting a normalization identification result, and completing normalization processing of the voltage sag event. According to the method, the influence of the monitoring device on the time error is overcome, the method does not completely depend on the criterion of the voltage sag occurrence moment, the sag waveform characteristics are considered, normalization identification is carried out by taking the sag waveform characteristics as the criterion, and the accuracy is high.
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Description

technical field

[0001] The invention belongs to the technical field of voltage sag events, and in particular relates to a voltage sag event normalization method based on waveform characteristics. Background technique

[0002] Analyzing voltage sag monitoring data is the basis for understanding and managing voltage sag problems. Whether it is to trace the cause or location of the sag, or to evaluate the sag event, it is first necessary to perform normalized identification of the sag event, that is, to clarify the sag event recorded by a large number of power quality monitoring devices in the power grid , which events are caused by the same fault. If the normalization result of the slump event is wrong, it may affect the subsequent analysis results, such as overestimation or underestimation of the sag evaluation result. However, the traditional method usually identifies the occurrence time of the sag event recorded by the monitoring device, and considers that the sag event o...

Claims

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