GIS partial discharge positioning method based on truncated singular value decomposition

A technology for truncating singular values ​​and partial discharges. It is applied in the direction of measuring electricity, measuring electrical variables, and testing dielectric strength. It can solve the problems of complex calculation difficulty, measurement uncertainty, and inconsistency of results in the solution process, and reduce complexity. and analysis difficulty, eliminating the influence of noise and clutter on useful signals, and positioning reliable and effective results

Pending Publication Date: 2021-06-25
HEFEI UNIV OF TECH +1
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Problems solved by technology

However, when solving nonlinear equations, the solution process is complex and difficult to calculate.
In a complex environment, the discharge signal is easily mixed with noise a...

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  • GIS partial discharge positioning method based on truncated singular value decomposition
  • GIS partial discharge positioning method based on truncated singular value decomposition
  • GIS partial discharge positioning method based on truncated singular value decomposition

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Embodiment Construction

[0070] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0071] refer to figure 1 A GIS partial discharge localization method based on truncated singular value decomposition provided in this embodiment includes the following steps:

[0072] S1: Establish a mathematical model for partial discharge (PD) localization based on time difference of arrival (TDOA):

[0073] Let the spatial position of the PD source be PD(x,y,z), and the coordinates of the i-th ultrasonic sensor be C i (x i ,y i ,z i ) (i=1,2,...,n). Based on the positioning principle of TDOA, the positioning equation group (1) based on the ultrasonic array signal can be established:

[0074]

[0075] Among them, the ultrasonic wave is from the PD source to the first ultrasonic sensor C 1 The time is T, and the time difference between the ultrasonic wave arriving at the first ultrasonic sensor from the PD source and the i-...

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Abstract

The invention discloses a GIS partial discharge positioning method based on truncated singular value decomposition. The method comprises the following steps of S1, establishing a mathematical model based on time difference of arrival partial discharge positioning; S2, a linear positioning equation set PX=Q being obtained through a spherical surface conversion method; S3, performing centralized pretreatment on the linear positioning equation set PX=Q to obtain a centralized positioning equation set PX = Q'; S4, performing decomposition calculation on the matrix P by applying a principal component triangular decomposition method to obtain an equivalent matrix P'of the matrix P'; S5, the matrix P' being substituted into a positioning equation set PX=Q', and an equivalent linear equation set P'X=Q' being obtained; S6, performing singular value decomposition on the matrix P' to obtain two orthogonal matrixes U=(u1,..., un) and V=(v1,..., vn) of the matrix P', and designing a filtering factor fi; and S7, solving P'X =Q' by applying a truncated singular value decomposition method. The method is reliable and effective in PD signal positioning in the GIS, and is high in positioning precision.

Description

technical field [0001] The invention relates to a GIS partial discharge positioning technology in the high voltage field, in particular to a GIS partial discharge positioning method based on truncated singular value decomposition. Background technique [0002] Partial Discharge (PD) in GIS equipment is the main cause of insulation defect cracking, and PD is a harbinger and an important phenomenon of equipment failure. It is very urgent and important to effectively detect and process PD signals to obtain effective information and effectively evaluate the equipment status. Obtain useful PD information through sensing technology to effectively locate PD sources, and timely alarm and evaluate fault points, thereby ensuring the normal and stable operation of GIS equipment. Therefore, the identification and location of uniform discharge in power equipment is of great significance to the safe and stable operation of power conversion and system. [0003] In the PD signal detection...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1209G01R31/1227
Inventor 何怡刚宁暑光何鎏璐曹志煌谢辉佐磊
Owner HEFEI UNIV OF TECH
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