CN-121994346-A - Non-contact type converter valve key component vibration signal measuring device and measuring method

CN121994346ACN 121994346 ACN121994346 ACN 121994346ACN-121994346-A

Abstract

The invention discloses a device and a method for measuring vibration signals of key components of a non-contact converter valve, wherein the device comprises a laser vibration meter, a signal conditioning and transmitting module and a data processing and characteristic extracting module; the laser vibration meter is used for acquiring vibration signals on the surface of the key component of the converter valve in a non-contact manner, the signal conditioning and transmitting module is used for conditioning and analog-to-digital converting the vibration signals and outputting preprocessed vibration data, and the data processing and characteristic extracting module is in communication connection with the signal conditioning and transmitting module and is configured for receiving the preprocessed vibration data and extracting key vibration characteristic quantities used for representing the working state of the key component of the converter valve in real time. The vibration signal measuring device for the key component of the non-contact converter valve can realize accurate acquisition of vibration signals, real-time extraction of key characteristic quantities and preliminary judgment of working states on the basis of meeting portable and quick erection requirements.

Inventors

LIU LONGCHEN
ZHANG YUQI
ZHU JUN
TANG SHIXIONG
HUANG YU
JI SHENGCHANG
ZHANG FAN
HE YUJUN
QIN JIANXU

Assignees

四川蜀能电科能源技术有限公司

Dates

Publication Date: 20260508
Application Date: 20260210

Claims (10)

1. A non-contact converter valve key assembly vibration signal measuring device, comprising: the laser vibration meter is used for acquiring vibration signals of the surface of the key component of the converter valve in a non-contact manner; the signal conditioning and sending module is used for conditioning and analog-to-digital converting the vibration signal and outputting preprocessed vibration data; The data processing and feature extraction module is in communication connection with the signal conditioning and sending module and is configured to receive the preprocessed vibration data and extract key vibration feature quantities used for representing the working state of key components of the converter valve in real time.
2. The non-contact converter valve key assembly vibration signal measuring device of claim 1, wherein the laser vibrometer is a single-point laser vibrometer.
3. The non-contact converter valve key assembly vibration signal measurement apparatus of claim 2, wherein the single-point laser vibrometer operating band covers a typical vibration frequency range of the converter valve key assembly; the working distance of the device meets the field non-contact measurement requirement of a converter valve hall.
4. The non-contact converter valve key assembly vibration signal measurement apparatus of claim 1, wherein said signal conditioning and transmitting module comprises: the input end of the signal conditioning circuit is connected with the analog signal output end of the laser vibration meter and is used for carrying out noise reduction treatment and amplitude conditioning on the original vibration signal; The analog-to-digital conversion unit is integrated in the singlechip system, and the input end of the analog-to-digital conversion unit is connected with the output end of the signal conditioning circuit and is used for converting the conditioned analog signal into a digital signal; The communication interface unit is integrated in the singlechip system, and the input end of the communication interface unit is connected with the output end of the analog-to-digital conversion unit and is used for transmitting digital vibration data to the data processing and feature extraction module; The power supply circuit comprises a plurality of voltage conversion modules and is used for providing working power for the signal conditioning circuit and the singlechip system.
5. The non-contact converter valve key component vibration signal measuring device according to claim 4, wherein the signal conditioning circuit comprises a filter network, an adjustable gain amplifying circuit and a direct current bias circuit which are sequentially connected in series; the input end of the filter network receives an original vibration signal of the laser vibration meter, performs noise reduction treatment on the original vibration signal, inputs the noise-reduced signal into the adjustable gain amplification loop for amplitude adjustment, and performs voltage translation on the gain-adjusted signal through the direct current bias circuit so as to adapt to the input voltage range of the analog-to-digital conversion unit and finally outputs a conditioned analog signal.
6. The non-contact converter valve key assembly vibration signal measurement apparatus of claim 1, wherein the data processing and feature extraction module is further configured to store and visually display vibration data; And supporting the set data acquisition time length and the measurement point grouping management.
7. The non-contact converter valve key assembly vibration signal measurement apparatus of claim 1, wherein said key vibration characteristic quantities include vibration acceleration effective value, vibration peak acceleration and characteristic frequency amplitude; The feature extraction is realized based on a frequency domain analysis method.
8. The non-contact converter valve key assembly vibration signal measurement apparatus of claim 1, wherein said data processing and feature extraction module supports multi-point measurement analysis; And the state diagnosis of the converter valve assembly is realized by comparing the vibration characteristic quantities of different measuring points.
9. A method for measuring vibration signals of key components of a non-contact converter valve, which is characterized in that the method adopts the vibration signal measuring device of the key components of the non-contact converter valve according to any one of claims 1 to 8, and comprises the following steps: collecting vibration signals of the surface of a key component of the converter valve; Conditioning and analog-to-digital converting the vibration signal and outputting preprocessed vibration data; And receiving the preprocessed vibration data, and extracting key vibration characteristic quantities for representing the working states of key components of the converter valve in real time.
10. The method for measuring vibration signals of a critical component of a non-contact converter valve according to claim 9, further comprising: comparing and analyzing the vibration characteristic quantities of the plurality of measuring points to obtain the associated information of the vibration characteristics of different measuring points; calculating transfer function characteristics of characteristic frequency components among different measuring points based on the association information; And carrying out fault early warning and state diagnosis on the key components of the converter valve according to the change of the transfer function characteristics.

Description

Non-contact type converter valve key component vibration signal measuring device and measuring method Technical Field The invention relates to the technical field of power transmission equipment state monitoring, in particular to a device and a method for measuring vibration signals of key components of a non-contact converter valve. Background The converter valve is used as one of the most critical devices in a converter station in an extra-high voltage direct current transmission system, and the reliability of the converter valve directly influences the safe and stable operation of the whole direct current engineering. Therefore, it is important to monitor the working state of the device on line in real time, and to pre-warn, detect and identify the faults of the device. The anode saturation reactor is a core component of a protection thyristor in the converter valve, and in the operation process, the saturation reactor can generate severe vibration by superposition of operation current and voltage abrupt change under the actions of magnetostriction effect, electromagnetic force and Lorentz force. The electric reactor core is prevented from being damaged by gasket abrasion and loosening, electric parameters of the electric reactor are changed, vibration characteristics are changed, operation safety of the converter valve is affected, faults such as loosening of a connecting bolt are easily caused, and vibration propagation characteristics of each converter valve assembly are changed. Therefore, the on-line detection of the operation state of the converter valve can be performed by collecting vibration data of key components of the converter valve, such as a saturation reactor. The existing measuring method for the vibration characteristics of the saturation reactors and other key components in the converter valve mainly comprises three design types. The method comprises the steps of adopting a contact type vibration measurement scheme, obtaining the whole vibration state through multipoint arrangement of vibration sensors, realizing vibration monitoring through wireless transmission of vibration signals, and solving the problems that installation is difficult, maintenance is needed, measuring points are more, and use cost is high. However, the existing design using laser or only considering the water leakage condition of the converter valve tower is difficult to actually deploy because of the fact that vibration signals are not extracted or more reflecting devices are required to be arranged. In addition, although the existing laser vibration meter can finish accurate measurement of physical quantity, an embedded algorithm for extracting key vibration characteristic quantity in real time at the site side and rapidly judging the state of equipment is lacking. The measurement data often needs back-end manual analysis, and the real-time online monitoring and early warning requirements cannot be met. The signal-to-noise ratio of the existing non-contact vibration monitoring technology (such as an acoustic probe) is too low under the strong background noise of a converter valve hall, so that the measurement accuracy and reliability are insufficient, and the vibration characteristics of a specific component are difficult to accurately identify. For the laser vibration measuring and monitoring technology, although more accurate surface vibration signal data can be obtained, the two aspects of the technology still have the defects that firstly, the technology is used for concentrating on laboratory environments, the special engineering design aiming at the complex noise background of a converter valve hall is lacked, secondly, the traditional laser vibration measuring system mainly focuses on the accurate acquisition of original vibration physical quantity, and the capability of extracting and outputting key vibration characteristic quantity capable of directly representing the state of equipment on the site side in real time is lacked, so that a large amount of acquired original data can not meet the requirements of real-time online monitoring on light weight and instantaneity of the data because the acquired large amount of original data must be transmitted back to the rear end for analysis, and the system is also more heavy and complex to install. In order to solve the problems that the existing monitoring device is insufficient in anti-interference design and lacks of instant vibration characteristic quantity extraction under the operation background of the converter valve, so that on-line measurement data and fault diagnosis time are disjointed and the installation difficulty is often large, the convenient non-contact measurement and extraction of the vibration characteristic quantity of the converter valve and key components thereof are realized, and the quick diagnosis of the operation state of the converter valve is assisted. Disclosure of Invention The invention provides a vibration signal measuring devi