CN-121984220-A - Transformer substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion

CN121984220ACN 121984220 ACN121984220 ACN 121984220ACN-121984220-A

Abstract

The invention belongs to the field of partial discharge positioning of transformer substations, and particularly relates to a transformer substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion, which comprises a sensing layer for synchronously acquiring ultra-wideband signals and infrared thermal imaging signals of the transformer substation partial discharge; the system comprises an ultra-wideband signal acquisition module, an infrared thermal imaging signal acquisition module, a discharge source positioning module, a fusion processing layer, an application layer and a transmission layer, wherein the fusion processing layer is used for carrying out data fusion on the ultra-wideband signal and the infrared thermal imaging signal and obtaining a discharge source positioning result, the application layer is used for visual display of the discharge source positioning result and operation and maintenance decision, and the transmission layer is used for data transmission. The invention adopts the ultra-wideband and infrared thermal imaging multi-mode fusion positioning technology, combines the accurate fusion positioning solving formula through time synchronization, spatial registration and layering fusion algorithm, and effectively makes up the defect of the single positioning technology. The invention has the characteristics of high positioning precision, high response speed and strong environmental adaptability, can realize accurate coordinate positioning and visual thermal state visualization of partial discharge of the transformer substation, and provides reliable decision support for operation and maintenance of the power grid.

Inventors

MA ZHIMING
LI JIXIANG
MA GUOFU
MA YINGJIE
Na Yanji
SHEN DEZHAO
ZHANG YUNFENG
CHANG JIE
LIU SHENGCHUN
SHANG GUOBIN
YUAN KUN
MA FEI
DING XIANGHAO
ZHANG BIAO

Assignees

青海德泓电力科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251219

Claims (10)

1. Substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion, which is characterized by comprising: the sensing layer is used for synchronously collecting ultra-wideband signals and infrared thermal imaging signals of partial discharge of the transformer substation; The fusion processing layer is used for carrying out data fusion on the ultra-wideband signal and the infrared thermal imaging signal and obtaining a discharge source positioning result; The application layer is used for visual display and operation and maintenance decision of the discharge source positioning result; and the transmission layer is used for data transmission between the sensing layer and the fusion processing layer and between the fusion processing layer and the application layer.
2. The substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion of claim 1, wherein the sensing layer comprises: the ultra-wideband antenna array module is used for collecting ultra-wideband signals of partial discharge of the transformer substation and is provided with a plurality of UWB array units; The infrared thermal imaging module is used for collecting infrared thermal imaging signals of partial discharge of the transformer substation; And the time service module unifies time references of the ultra-wideband antenna array module and the infrared thermal imaging module.
3. The substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion according to claim 2, wherein the fusion processing layer comprises: the time synchronization compensation module is used for eliminating acquisition time deviation of the ultra-wideband signal and the infrared thermal imaging signal; The space coordinate registration module establishes a mapping relation between an ultra-wideband coordinate system and an infrared world coordinate system; The feature layer fusion module calculates credibility weight of ultra-wideband positioning Confidence weighting with infrared positioning ; And the decision layer fusion module dynamically fuses the ultra-wideband positioning result and the infrared positioning result based on the credibility weight.
4. A substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion as claimed in claim 3, wherein the time synchronization compensation module compensates for time synchronization of ultra-wideband signal acquisition Time synchronization compensation for infrared thermal imaging signal acquisition Wherein For the acquisition time of the ultra-wideband signal, For the acquisition time of infrared thermal imaging, 、 Respectively ultra-wideband signal acquisition and infrared thermal imaging acquisition relative to reference time by using time service module And (2) time deviation of 。
5. A substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion as claimed in claim 3, wherein the spatial coordinate registration module constructs a registration transformation matrix Wherein For a 3x3 rotation matrix, For 3x1 translation vector, infrared positioning coordinates after registration The following formula is satisfied: , Optimizing transformation matrices by minimizing registration errors The registration error function is: , Wherein, the , 、 Respectively the first Ultra-wideband positioning coordinates and infrared coordinates of the reference points are minimized by solving to obtain an optimal registration matrix 。
6. The substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion according to claim 3, wherein the decision layer fusion module uses the weighted result as an observed value, and adopts Kalman filtering to realize dynamic fusion, and the Kalman filtering state equation and the observed equation are respectively: Equation of state Observation equation , Wherein, the Is the first Fusing the positioning results at the moment; Is a state matrix under the assumption of uniform motion ; For process noise, gaussian distribution, variance ; In order to observe the value of the value, To observe noise, gaussian distribution, variance ; The Kalman filtering fusion solving process is as follows: Predicting state Prediction covariance matrix Kalman gain First, the Time optimal fusion positioning result Post-update covariance matrix And obtaining an optimal fusion positioning result through the steps of prediction and updating.
7. A substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion as defined in claim 3, wherein the reliability weight of ultra-wideband positioning From signal to noise ratio Assessment of reliability weight for infrared positioning From hot spot contrast The confidence weight calculation formula is evaluated as follows: , , Wherein, the For the normalized coefficient to be a function of the normalized coefficient, The value range is 1-1.5.
8. The substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion according to claim 2, wherein the ultra-wideband antenna array module obtaining substation partial discharge positioning information comprises the following steps: Coordinate of UWB array unit contained in ultra-wideband antenna array module The coordinates of the discharge source of the transformer substation are as follows Propagation speed of UWB array unit in air ; Taking the first UWB array unit as a reference unit, the first The signal arrival time difference between each UWB array unit and the reference unit is Solving the partial discharge positioning information of the power station by the following equation: 。
9. The ultra-wideband and thermal imaging fusion-based substation partial discharge positioning system of claim 8, further comprising a method for solving a station partial discharge positioning equation using a weighted least squares method, comprising the steps of: defining residual vectors Wherein For the coordinate vector to be solved for, Is a vector of a non-linear function, Is an observation vector; The iterative solution is performed by the following iterative formula: , Wherein, the Is a jacobian matrix; Is a weighting matrix; For the number of iterations, up to an iteration error Converging to obtain positioning result 。
10. The substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion of claim 8, wherein the positioning solution of the infrared thermal imaging module comprises the following steps: let infrared thermal imaging pixel coordinates be The hot spot area pixel set is Wherein The hot spot center pixel coordinates are the hot spot pixel number The calculation formula is as follows: , , Wherein, the Is a pixel Gray values of (2); let the infrared camera internal reference matrix be The external reference matrix is obtained by a calibration method, and the coordinate conversion formula is as follows: , Wherein, the In order to rotate the matrix is rotated, In order to translate the vector of the vector, Is a scale factor; Calibrating the positioning result of the UWB array unit to obtain an infrared positioning result 。

Description

Transformer substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion Technical Field The invention belongs to the field of partial discharge positioning of transformer substations, and particularly relates to a transformer substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion. Background The transformer substation is used as a core hub of the power system, plays a key role in electric energy transmission and distribution, and the insulation state of equipment directly relates to the overall safe and stable operation of a power grid, so that the transformer substation is an important foundation for guaranteeing the reliable supply of power. Partial discharge is a typical early feature of insulation degradation of power equipment, and can intuitively reflect insulation defects in the equipment or on the surface, so that the position of a partial discharge source is accurately positioned, and the partial discharge device has important significance for timely carrying out fault early warning, formulating scientific operation and maintenance strategies and avoiding serious power accidents caused by further degradation of insulation faults, and has become a research focus and core requirement in the field of power operation and maintenance. Currently, the technical means for positioning partial discharge of a transformer substation are various, wherein an ultra-wideband antenna array technology and an infrared thermal imaging technology are two main stream technologies with wider application. The ultra-wideband antenna array technology has excellent time resolution by virtue of the characteristics of the narrow pulse signals, can realize accurate space positioning on a discharge source in equipment, and shows remarkable advantages in the aspect of detecting the insulation defects in the equipment. However, the technology has obvious limitations, cannot intuitively present the actual physical state of the discharge area, has insufficient capability in visual recognition of surface discharge, and is difficult to help operation and maintenance personnel to intuitively perceive the discharge scene. The infrared thermal imaging technology can intuitively present the thermal distribution state of a discharge area by capturing the temperature change generated by dielectric loss in the partial discharge process, and has unique advantages in the aspect of visual monitoring of surface discharge. However, the technology is easily influenced by external environmental factors and measurement conditions, positioning accuracy is difficult to guarantee, locking capability of a micro discharge source is weak, and actual requirements of accurate operation and maintenance cannot be met. In sum, the existing single partial discharge positioning technology has respective short plates and limitations, is difficult to simultaneously consider the accurate positioning and visual monitoring requirements of the discharge source, cannot fully adapt to complex equipment environments and diversified discharge scenes of the transformer substation, and restricts the improvement of the insulation state monitoring level of the transformer substation. Therefore, it is necessary to explore a positioning scheme capable of fusing different technical advantages to break through the bottleneck of the prior art and provide more reliable technical support for the safe operation and maintenance of the transformer substation. Disclosure of Invention The substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion can effectively solve the problems in the background technology. The invention provides a transformer substation partial discharge positioning system based on ultra-wideband and thermal imaging fusion, which comprises the following components: the sensing layer is used for synchronously collecting ultra-wideband signals and infrared thermal imaging signals of partial discharge of the transformer substation; The fusion processing layer is used for carrying out data fusion on the ultra-wideband signal and the infrared thermal imaging signal and obtaining a discharge source positioning result; The application layer is used for visual display and operation and maintenance decision of the discharge source positioning result; and the transmission layer is used for data transmission between the sensing layer and the fusion processing layer and between the fusion processing layer and the application layer. As a further optimization of the present invention, the perception layer comprises: the ultra-wideband antenna array module is used for collecting ultra-wideband signals of partial discharge of the transformer substation and is provided with a plurality of UWB array units; The infrared thermal imaging module is used for collecting infrared thermal imaging signals of partial discharge of the transformer substation; And the time ser