KR-20260065247-A - System and Method for detecting quench of high temperature superconducting cable near to joint box using waveform reflectometry

KR20260065247AKR 20260065247 AKR20260065247 AKR 20260065247AKR-20260065247-A

Abstract

The present invention discloses a system and method for detecting a value of a superconducting cable. According to a specific embodiment of the present invention, the value detection system comprises: a waveform generator that generates a preset reference signal; a superconducting cable comprising a first superconducting cable and a second superconducting cable through a source terminal connected to one end of the reference signal; a joint box connecting the first superconducting cable and the second superconducting cable; a receiver that receives a reflected signal generated from the cable when sequentially passing through a load terminal connected to the other end of the superconducting cable; and a value detection device that estimates the location of a value generated around the joint box using a reflected wave measurement method based on the reference signal and the reflected signal.

Inventors

장승진
성현모
심연섭

Assignees

한국전력공사
국립한밭대학교 산학협력단

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (14)

A waveform generator (1) that generates a preset reference signal; A superconducting cable (3) comprising a first superconducting cable (3-1) and a second superconducting cable (3-3) through a source terminal (2) connected to one end of the above reference signal, a joint box (4) connecting the first superconducting cable (3-1) and the second superconducting cable (3-3), and a receiver (6) receiving a reflected signal generated from the cable (3) when sequentially passing through a load terminal (5) connected to the other end of the superconducting cable (3); and A value detection device (11) that estimates the position of a value generated around a joint box (4) using a reflected wave measurement method based on the reference signal and the reflected signal; A system for detecting the value of a superconducting cable around a joint box using a reflected wave measurement method characterized by including
In Article 1, A system for detecting the value of a superconducting cable around a joint box using a reflected wave measurement method, characterized by including a T-connector (7) that connects the waveform generator (1) and the receiver (6) to the source terminal (2).
In Article 1, A system for detecting the value of a superconducting cable around a joint box using a reflection measurement method characterized in that the above reflection measurement method is a Time-Frequency Domain Reflectometry (TFDR).
In Article 1, The above ?? value detection device (11) is, An anomaly detection unit (100) that detects a TFCC signal derived as the solution of a TFCC (Time-Frequency Cross Correlation) function that defines the correlation between the energy distribution of the reflected signal and the reference signal, where the anomaly score derived by the AE (AutoEncoder) exceeds a preset maximum reconstruction error; and A system for detecting the value of a superconducting cable around a joint box using a measurement method, characterized by including: a source separation unit (200) that separates the derived TFCC signal into a first TFCC signal (TFCC1) around the joint box (4) and a second TFCC signal (TFCC2) of the joint box (4) itself based on an EM (Expectation-Maximization) algorithm, and then detects the location of the value of the value generated around the joint box (4) and the location of the joint box (4) using the peak value of the separated first TFCC signal (TFCC1) and the peak value of the second TFCC signal (TFCC2).
In Article 4, A system for detecting the value of a superconducting cable around a joint box using a measurement method characterized in that the maximum reconstruction error is set to 1.
In Article 4, The above reference signal is a mathematical formula A system for detecting the value of a superconducting cable around a joint box using a measurement method characterized by being defined as follows: (where α and β are time duration (TD) and frequency bandwidth (BW), respectively, t₀ is the center time, t is the time vector, and ω₀ is the center angular velocity frequency determined by the center frequency (CF).
In Article 6, The above energy distribution (W) is a mathematical formula A system for detecting the value of a superconducting cable around a joint box using a measurement method characterized by being defined as (where S * is the complex conjugate of the signal, ω is the frequency, τ is the time, and j is the imaginary number).
In Article 7, The above TFCC function ( ) is a mathematical expression A system for detecting the value of a superconducting cable around a joint box using a measurement method characterized by being defined as (where Ws and Wr are the energy distributions of the reference signal and the reflected signal, respectively, and t' is time).
In Article 8, The probability that the above TFCC signal occurs in a specific-th Gaussian time distribution ( ) is a mathematical expression (Here, P is the conditional probability, z is the i-th data, and j is the classification class) A system for detecting the value of a superconducting cable around a joint box using a measurement method characterized by being defined as follows: is the given data, φ is the ratio of data by classification class, μ is the mean, and σ is the standard deviation.
In Article 4, The above score ( ) is a mathematical expression ((Here, , is a reflected signal, and is a reconstruction signal, and , A system for detecting the value of a superconducting cable around a joint box using a measurement method characterized by being defined as (where is the maximum and minimum reconstruction error in a steady state).
In Article 10, The above score The above maximum reconstruction error ( A system for detecting the value of a superconducting cable around a joint box using a measurement method, characterized in that if the impedance is greater than ) the superconducting cable (3) is determined to be in an abnormal state at the point where the impedance is mismatched.
In Article 4, A system for detecting the value of a superconducting cable around a joint box using a measurement method characterized by the above EM algorithm separating the TFCC signal into the first TFCC signal (TFCC1) and the second TFCC signal (TFCC2) using multiple Gaussian envelopes.
(a) A step in which a waveform generator (1) generates a preset reference signal; (b) a step in which a receiver (6) receives a reflected signal generated from the cable (3) when the reference signal sequentially passes through a source terminal (2) connected to one end, a superconducting cable (3) comprising a first superconducting cable (3-1) and a second superconducting cable (3-3), a joint box (4) connecting the first superconducting cable (3-1) and the second superconducting cable (3-3), and a load terminal (5) connected to the other end of the superconducting cable (3); and (c) A step in which a ?? value detection device (11) estimates the location of a ?? value generated around the joint box (4) using a reflected wave measurement method based on the reference signal and the reflected signal; A method for detecting the value of a superconducting cable around a joint box using a reflected wave measurement method characterized by including
In a computer-readable storage medium storing a program for executing on a computer a method for detecting the value of a superconducting cable around a joint box using a reflected wave measurement method, The above method is, (a) A step in which a waveform generator (1) generates a preset reference signal; (b) a step in which a receiver (6) receives a reflected signal generated from the cable (3) when the reference signal sequentially passes through a source terminal (2) connected to one end, a superconducting cable (3) comprising a first superconducting cable (3-1) and a second superconducting cable (3-3), a joint box (4) connecting the first superconducting cable (3-1) and the second superconducting cable (3-3), and a load terminal (5) connected to the other end of the superconducting cable (3); and (c) A step in which a ?? value detection device (11) estimates the location of a ?? value generated around a joint box (4) using a reflected wave measurement method based on the reference signal and the reflected signal; characterized in that the storage medium comprises

Description

System and Method for detecting quench of high temperature superconducting cable near joint box using waveform reflectometry The present invention relates to a system and method for detecting the value of a superconducting cable, and more specifically, to a technology that enables accurate detection of the value position of a superconducting cable around a joint box using a time-frequency domain reflection measurement method and an EM (Expectation-Maximization) algorithm. In a superconducting cable system where electrical resistance becomes zero below a certain temperature, a quenching phenomenon occurs in which the superconducting state is broken due to an excess of critical temperature, current, and magnetic field. The quenching phenomenon refers to the phenomenon in which a superconductor loses its superconducting state and returns to a normal conductive state. In such general superconducting cable systems, the ?? value phenomenon is detected by reflection measurement, but superconducting cable systems using this reflection measurement method have reached a limit where it is difficult to distinguish between the ?? values around the joint box (i.e., connection box) and the ?? values of the joint box itself because the reflected signals overlap when reflected signals are received. Accordingly, the applicant intends to propose a method to accurately detect the location of a defect by distinguishing between defects around the joint box and defects occurring within the joint box itself in a superconducting cable system. Accordingly, this specification was developed through research funding support for the project "Derivation of Degradation Factors and Development of Condition Diagnosis Techniques for HVDC MI Submarine Cables," initiated by Korea Electric Power Corporation in 2022 (Project No.: R22XO05-03). The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a diagram of a superconducting cable system to which an embodiment is applied. Figure 2 is a detailed configuration diagram of the ?? detection system of Figure 1. Figure 3 is a detailed configuration diagram of the anomaly detection unit of Figure 2. Figure 4 is a detailed configuration diagram of the AE (AutoEncoder) module of Figure 3. Figure 5 is a detailed configuration diagram of the source separation section of Figure 2. Figure 6 is an example diagram illustrating the concept of the EM (Expectation-Maximization) algorithm of Figure 5. Figure 7 is an example diagram showing a modeling that derives the position of the ?? and the position of the joint box of Figure 6. Figure 8 is an overall flowchart showing the operation process of the ?? value detection system of Figure 1. Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In addition, parts unrelated to the description have been omitted in the drawings to clearly explain the invention. Below, with reference to the attached drawings, embodiments of the invention are described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the invention in the drawings, parts unrelated to the description have been omitted, and similar parts throughout the specification have been given similar reference numerals. An embodiment described below specifically explains a system and method for detecting the value of a superconducting cable around a joint box using a reflected wave measurement method. FIG. 1 is a configuration diagram of a superconducting cable system to which an embodiment is applied, and the superconducting cable system includes a reference signal (1-1) generated by a waveform generator (1) that sequentially passes through a superconducting cable (3), a joint box (4), and a load terminal (5) through a source terminal (2), and receives a reflected signal (1-2) generated from the superconducting cable (3) through a receiver (6), and estimates the location of the ?? value generated around the joint box (4) and the location of the joint box (4) based on the generated reference signal (1-1) and the received reflected signal (1-2). The superconducting cable (3) consists of a first superconducting cable (3-1) and a second superconducting cable (3-3), and the first superconducting cable (3-1) and the second superconducting cable