A voltage sag event normalization method based on waveform characteristics

A voltage sag and waveform feature technology, applied in the direction of measuring current/voltage, measuring electrical variables, computer components, etc., can solve the problem of poor identification accuracy of sag normalization

Active Publication Date: 2021-07-20
SICHUAN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor identification accuracy of traditional method sag normalization, and propose a voltage sag event normalization method based on waveform characteristics

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  • A voltage sag event normalization method based on waveform characteristics
  • A voltage sag event normalization method based on waveform characteristics
  • A voltage sag event normalization method based on waveform characteristics

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Embodiment Construction

[0071] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0072] Before describing the specific embodiments of the present invention, in order to make the scheme of the present invention more clear and complete, at first the abbreviations and key term definitions that appear in the present invention are explained:

[0073] Normalization of voltage sag events: refers to the process of judging which recorded sag events are caused by the same fault according to the monitoring data because the power grid may record sag events at multiple monitoring points, which is called the normalization process;

[0074] Sag classification: According to the relationship between voltage sag three-phase voltage amplitude and phase, voltage sag events are conventionally divided into different sag types.

[0075] Such as figure 1 As shown, the present invention provides a voltage sag event normalization method based on waveform cha...

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Abstract

The invention discloses a voltage sag event normalization method based on waveform characteristics, comprising the following steps: S1: using a voltage monitoring device to collect three-phase voltage amplitudes of A, B, and C; S2: filtering the three phases of A, B, and C Zero-sequence voltage of the phase voltage amplitude to obtain the three-phase phase voltage of A, B and C and the three-phase line voltage of A, B and C; S3: according to the three-phase phase voltage of A, B and C and the three-phase of A, B and C Judging the type of sag by line voltage; S4: Calculate the segmental similarity of events of the same sag type according to the three-phase voltage amplitudes of A, B, and C; S5: Obtain the initial similarity set based on the segmental similarity of events of the same sag type ; Mining and correcting the influence of transformers based on association rules, outputting normalized identification results, and completing the normalized processing of voltage sag events. The invention overcomes the influence of the monitoring device on the time error, does not completely depend on the criterion of the voltage sag occurrence time, considers the characteristics of the sag waveform, and uses it as the criterion to carry out normalized identification with high accuracy.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/62G06K9/00G01R19/165
CPCG01R19/16576G01R19/16538G06F2218/08G06F2218/12G06F18/22
Inventor 胡文曦肖先勇汪颖郑子萱李长松
Owner SICHUAN UNIV
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