Converter valve cooling system main circulating pump and vibration data acquisition method and device thereof
By collecting the current signal of the main circulating pump of the converter valve cooling system to determine the working status, and collecting and storing vibration signals according to the set frequency of the status, the problem of not being able to distinguish the collection and storage of vibration data during the start-up and shutdown process in the existing technology is solved, and the accurate assessment of the status of the main circulating pump is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- STATE GRID JIANGSU ELECTRIC POWER CO LTD MAINTENANCE BRANCH
- Filing Date
- 2023-07-03
- Publication Date
- 2026-06-26
AI Technical Summary
Existing methods for acquiring vibration data of the main circulating pump in a converter valve cooling system cannot fully capture vibration data during the start-up and shutdown process, and cannot distinguish and store the acquired data from the start-up and shutdown process and the stable operation process, resulting in an inability to accurately assess the working status of the main circulating pump.
By collecting the current signal of the main circulating pump of the converter valve cooling system, the working state is determined based on the current signal. Vibration signals are collected at the set frequency according to different working states and stored in the corresponding database, so as to realize the distinguishing collection and storage of vibration data during start-up and shutdown and during stable operation.
It enables accurate acquisition and storage of vibration signals from the main circulating pump of the converter valve cooling system under different operating conditions, facilitating accurate evaluation of the pump's operation in the future.
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Figure CN116906314B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the technical field of converter valve cooling system, specifically relating to a main circulation pump of converter valve cooling system and its vibration data acquisition method and device. Background Technology
[0002] In recent years, ultra-high voltage direct current (UHVDC) transmission technology has developed rapidly, and converter valves, as core equipment in DC projects, have played a crucial role. The converter valve cooling system (hereinafter referred to as the "valve cooling system"), as a core auxiliary device of the converter valve, requires stable and reliable operation as a necessary condition for the normal operation of the converter valve. The power system in the converter station cooling system generally consists of two main circulating pumps, which serve as backups for each other. That is, the two main circulating pumps provide safety assurance through a bypass model of non-working standby. When one of the two main circulating pumps fails, the control device will immediately switch to start the other non-working standby main circulating pump. In addition, the two main circulating pumps still periodically switch between working and non-working standby roles. As the power source of the valve cooling system, the failure of the main circulating pump is the primary cause of valve cooling system failures.
[0003] Online monitoring devices are crucial for timely detection of equipment defects and prevention of main circulation pump failures in valve-cooled systems. For main circulation pump systems, various signals can be monitored and diagnosed, including vibration, temperature, pressure, and current. Among these, vibration signals can quickly and directly reflect the operating status of the equipment, and vibration signal analysis is the most widely used method for main circulation pump condition monitoring. During normal operation, especially during switching, the motor and pump of the valve-cooled main pump generate significant vibrations and noise, which can significantly impact the alignment and other performance characteristics of the motor and pump in the main circulation pump system. Therefore, analyzing the state during the start-up and shutdown of the main circulation pump is an important part of its condition evaluation. Extracting vibration acceleration data during the start-up and shutdown process is key to this evaluation. Existing acquisition methods cannot fully capture the vibration data during the start-up and shutdown process, and the data is stored uniformly without distinguishing between data collected during start-up, shutdown, and stable operation. Therefore, an effective method is urgently needed to address this issue. Summary of the Invention
[0004] To address the shortcomings of existing technologies, this invention provides a main circulating pump for a converter valve cooling system and a method and apparatus for acquiring its vibration data, which can accurately acquire vibration signals of the main circulating pump under different operating conditions.
[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:
[0006] In a first aspect, a method for acquiring vibration data of the main circulating pump of a converter valve cooling system is provided, comprising: acquiring the current signal of the main circulating pump of the converter valve cooling system; determining the working state of the main circulating pump of the converter valve cooling system based on the current signal; acquiring the vibration signal of the main circulating pump of the converter valve cooling system at a set frequency corresponding to the working state of the main circulating pump of the converter valve cooling system; and storing the vibration signal of the main circulating pump of the converter valve cooling system into a corresponding database according to the working state of the main circulating pump of the converter valve cooling system.
[0007] Furthermore, the current signal is the A-phase, B-phase, or C-phase current signal of the three-phase motor of the main circulating pump of the converter valve cooling system.
[0008] Furthermore, the operating states of the main circulation pump of the converter valve cooling system include: start-up state, running state, and stop state; wherein, the start-up state refers to the process of the current signal of the main circulation pump of the converter valve cooling system increasing from zero to the rated current, and the stop state refers to the process of the current signal of the main circulation pump of the converter valve cooling system decreasing from the rated current to zero.
[0009] Furthermore, the vibration signal of the main circulating pump of the converter valve cooling system is collected according to a set frequency corresponding to the working state of the main circulating pump of the converter valve cooling system, including: when the working state of the main circulating pump of the converter valve cooling system is the start state or the stop state, continuous sampling is performed according to the set continuous sampling frequency; when the working state of the main circulating pump of the converter valve cooling system is the running state, sampling is performed according to the set single sampling frequency.
[0010] Furthermore, the continuous sampling frequency refers to a sampling frequency of 10K / s to 14K / s; the single sampling frequency refers to a sampling frequency of once every 6s to 10s.
[0011] Secondly, a vibration data acquisition device for the main circulating pump of a converter valve cooling system is provided, comprising: a data acquisition unit for acquiring the current signal of the main circulating pump of the converter valve cooling system through a current sensor; a data acquisition and processing module for determining the operating state of the main circulating pump of the converter valve cooling system based on the current signal of the main circulating pump of the converter valve cooling system; the data acquisition unit is further used to acquire the vibration signal of the main circulating pump of the converter valve cooling system through a vibration sensor at a set frequency corresponding to the operating state of the main circulating pump of the converter valve cooling system; the data acquisition and processing module is further used to store the vibration signal of the main circulating pump of the converter valve cooling system into a corresponding database according to the operating state of the main circulating pump of the converter valve cooling system.
[0012] Thirdly, a main circulating pump for a converter valve cooling system is provided, equipped with the vibration data acquisition device for the main circulating pump of the converter valve cooling system described in the second aspect; the main circulating pump of the converter valve cooling system includes: a first circulating pump driven by a first motor, the inlet of the first circulating pump being connected to the return water pipe of the converter valve cooling system, and the outlet of the first circulating pump being connected to the supply water pipe of the converter valve cooling system; a second circulating pump driven by a second motor, the inlet of the second circulating pump being connected to the return water pipe of the converter valve cooling system, and the outlet of the second circulating pump being connected to the supply water pipe of the converter valve cooling system; a first vibration sensor for acquiring vibration signals of the first circulating pump; a second vibration sensor for acquiring vibration signals of the second circulating pump; a first current sensor for acquiring current signals of the first motor; and a second current sensor for acquiring current signals of the second motor; the first vibration sensor, the second vibration sensor, the first current sensor, and the second current sensor are respectively electrically connected to a data acquisition unit; the data acquisition unit is electrically connected to a data acquisition and processing module; and the data acquisition and processing module is electrically connected to a database.
[0013] Furthermore, the output end of the first motor is drivenly connected to the first coupling, and the first coupling is drivenly connected to the input shaft of the first circulating pump; the output end of the second motor is drivenly connected to the second coupling, and the second coupling is drivenly connected to the input shaft of the second circulating pump.
[0014] Furthermore, the first vibration sensor is installed at the pump end bearing housing of the first circulating pump or on the motor output end bearing housing of the first motor; the second vibration sensor is installed at the pump end bearing housing of the second circulating pump or on the motor output end bearing housing of the second motor.
[0015] Furthermore, the first motor is a three-phase motor, and the first current sensor is installed on phase A, phase B, or phase C of the first motor; the second motor is a three-phase motor, and the second current sensor is installed on phase A, phase B, or phase C of the second motor.
[0016] Furthermore, the data acquisition and processing module is used to determine the operating state of the first circulating pump in the main circulating pump of the converter valve cooling system based on the current signal of the first motor in the main circulating pump of the converter valve cooling system; it is also used to determine the operating state of the second circulating pump in the main circulating pump of the converter valve cooling system based on the current signal of the second motor in the main circulating pump of the converter valve cooling system; it is also used to store the vibration signal of the first circulating pump in the main circulating pump of the converter valve cooling system into the corresponding database according to the operating state of the first circulating pump in the main circulating pump of the converter valve cooling system; and it is also used to store the vibration signal of the second circulating pump in the main circulating pump of the converter valve cooling system into the corresponding database according to the operating state of the second circulating pump in the main circulating pump of the converter valve cooling system.
[0017] Furthermore, the data acquisition device is used to acquire the vibration signal of the first circulating pump in the main circulating pump of the converter valve cooling system at a set frequency corresponding to the working state of the first circulating pump in the main circulating pump of the converter valve cooling system; it is also used to acquire the vibration signal of the second circulating pump in the main circulating pump of the converter valve cooling system at a set frequency corresponding to the working state of the second circulating pump in the main circulating pump of the converter valve cooling system; wherein, if the working state is the start state or the stop state, continuous sampling is performed at a set continuous sampling frequency, wherein the continuous sampling frequency refers to a sampling frequency of 10K / s to 14K / s; if the working state is the running state, sampling is performed at a set single sampling frequency, wherein the single sampling frequency refers to a sampling frequency of once every 6s to 10s.
[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention acquires the current signal of the main circulating pump of the converter valve cooling system; determines the working state of the main circulating pump of the converter valve cooling system based on the current signal; acquires the vibration signal of the main circulating pump of the converter valve cooling system according to a set frequency corresponding to the working state of the main circulating pump of the converter valve cooling system; and stores the vibration signal of the main circulating pump of the converter valve cooling system into the corresponding database according to the working state of the main circulating pump of the converter valve cooling system. The present invention can accurately acquire the vibration signal of the main circulating pump of the converter valve cooling system under different working states, realizes the distinguishable acquisition and storage of vibration signals, and facilitates the accurate evaluation of the working condition of the main circulating pump of the converter valve cooling system. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the system structure of the vibration data acquisition device for the main circulating pump of the converter valve cooling system in an embodiment of the present invention;
[0020] Figure 2 This is a schematic diagram of the overall structure of the main circulation pump of the converter valve cooling system in an embodiment of the present invention;
[0021] Figure 3 This is a schematic diagram of the main process of the vibration data acquisition method for the main circulating pump of the converter valve cooling system in this embodiment of the invention;
[0022] Figure 2 In the middle: 11. First motor; 12. First coupling; 13. First circulating pump; 14. First current sensor; 15. First vibration sensor; 21. Second motor; 22. Second coupling; 23. Second circulating pump; 24. Second current sensor; 55. Second vibration sensor; 3. Return water pipe; 4. Water supply pipe. Detailed Implementation
[0023] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.
[0024] Example 1:
[0025] Currently, the market does not differentiate between the high-energy vibration signals generated during the normal operation and switching of the main circulation pump. Instead, it uses conventional vibration data acquisition methods: a data acquisition device collects vibration data from the main circulation pump at set sampling intervals, and then analyzes and processes the collected data to diagnose the operating status of the main circulation pump. The main drawback of this sampling method is that the acquisition system generally operates 24 / 7, and the acquisition device collects data at fixed sampling intervals, typically every 5-10 seconds (if the sampling time is too short, it will result in a large amount of data storage, which is not conducive to system operation). However, the start-up and shutdown time of the main circulation pump is about 2 seconds. Therefore, the existing acquisition method cannot fully capture the vibration data during the start-up and shutdown process of the main circulation pump. Furthermore, the existing technology stores the collected data uniformly without distinguishing between the collected data during the start-up and shutdown process and the data collected during the stable operation process.
[0026] like Figure 1 , Figure 3 As shown, this embodiment provides a method for acquiring vibration data of the main circulating pump of a converter valve cooling system, including: acquiring the current signal of the main circulating pump of the converter valve cooling system; determining the working state of the main circulating pump of the converter valve cooling system based on the current signal; acquiring the vibration signal of the main circulating pump of the converter valve cooling system according to a set frequency corresponding to the working state of the main circulating pump of the converter valve cooling system; and storing the vibration signal of the main circulating pump of the converter valve cooling system into a corresponding database according to the working state of the main circulating pump of the converter valve cooling system.
[0027] like Figure 1 , Figure 2 As shown, the main circulation pump of the converter valve cooling system includes: a first circulation pump 13 driven by a first motor 11, a second circulation pump 23 driven by a second motor 21, a first vibration sensor (PO1 vibration sensor) 15 for collecting vibration signals of the first circulation pump 13, a second vibration sensor (PO2 vibration sensor) 25 for collecting vibration signals of the second circulation pump 23, a first current sensor 14 for collecting current signals of the first motor 11, and a second current sensor 24 for collecting current signals of the second motor 21.
[0028] The first vibration sensor 15, the second vibration sensor 25, the first current sensor 14, and the second current sensor 24 are electrically connected to the data acquisition unit.
[0029] The inlet of the first circulating pump 13 is connected to the return water pipe 3 of the converter valve cooling system, and the outlet of the first circulating pump 13 is connected to the supply water pipe 4 of the converter valve cooling system; the inlet of the second circulating pump 23 is connected to the return water pipe 3 of the converter valve cooling system, and the outlet of the second circulating pump 23 is connected to the supply water pipe 4 of the converter valve cooling system.
[0030] The data acquisition and processing module is electrically connected to the data acquisition unit; the database is electrically connected to the data acquisition and processing module.
[0031] The output end of the first motor 11 is connected to the first coupling 12, and the first coupling 12 is connected to the input shaft of the first circulating pump 13; the output end of the second motor 21 is connected to the second coupling 22, and the second coupling 22 is connected to the input shaft of the second circulating pump 23.
[0032] The first vibration sensor 15 is installed at the pump end bearing housing of the first circulating pump 13 or on the motor output end bearing seat of the first motor 11.
[0033] The second vibration sensor 25 is installed at the pump end bearing housing of the second circulating pump 23 or on the motor output end bearing seat of the second motor 21.
[0034] The first motor 11 is a three-phase motor, and the first current sensor 14 is installed on phase A, phase B or phase C of the first motor 11.
[0035] The second motor 21 is a three-phase motor, and the second current sensor 24 is installed on phase A, phase B or phase C of the second motor 21.
[0036] The first vibration sensor 15 is used to collect vibration signals (vibration acceleration data) at key locations of the first circulating pump 13, and the second vibration sensor 25 is used to collect vibration signals (vibration acceleration data) at key locations of the second circulating pump 23. The first current sensor is used to collect current data of the first motor, and the second current sensor is used to collect current data of the second motor.
[0037] The data acquisition unit is used to control the data sampling frequency of each sensor and the organization and uploading of the sampled data. The data acquisition unit selected is the NI 9230 data acquisition unit, with a sampling frequency of 12.8K. The data acquisition and processing module is used to receive the current signal data (the current signal data is the A-phase, B-phase, or C-phase current signal of the three-phase motor of the main circulating pump of the converter valve cooling system) and vibration signal data uploaded by the data acquisition unit. Based on the current data collected by the P01 and P02 motor current sensors, the operating status of the corresponding circulating pump is determined. Then, based on the operating status of each circulating pump, the data acquisition unit is controlled to perform single sampling or continuous sampling on the corresponding channel. The single sampling is performed once every 6s to 10s. Continuous sampling is performed at a sampling frequency of 10K / s to 14K / s without interruption. Vibration acceleration data (vibration signals) are stored in the corresponding database according to the operating status of each circulating pump. Specifically, the data acquisition and processing module determines the operating status of the first circulating pump 13 in the main circulating pump of the converter valve cooling system based on the current signal of the first motor 11; it determines the operating status of the second circulating pump 23 in the main circulating pump of the converter valve cooling system based on the current signal of the second motor 21; and the data acquisition unit performs sampling according to the operating status of the first circulating pump 13 in the main circulating pump of the converter valve cooling system. The vibration signal of the first circulating pump 13 in the main circulating pump of the converter valve cooling system is collected at a set frequency corresponding to the working state. The vibration signal of the second circulating pump 23 in the main circulating pump of the converter valve cooling system is collected at a set frequency corresponding to the working state. If the working state is the start state or the stop state, continuous sampling is performed at a set continuous sampling frequency. In this embodiment, the continuous sampling frequency is set to 12.8K / s. If the working state is the running state, sampling is performed at a set single sampling frequency. In this embodiment, the single sampling frequency is set to a sampling frequency of once every 8s, that is, once every 0.078ms.
[0038] The data acquisition and processing module stores the vibration signal of the first circulating pump 13 in the main circulating pump of the converter valve cooling system into the corresponding database according to the working state of the first circulating pump 13 in the main circulating pump of the converter valve cooling system; and stores the vibration signal of the second circulating pump 23 in the main circulating pump of the converter valve cooling system into the corresponding database according to the working state of the second circulating pump 23 in the main circulating pump of the converter valve cooling system.
[0039] like Figure 2 , Figure 3As shown, each current sensor collects the motor current and uploads it to the data acquisition and processing module via a data acquisition unit. The data acquisition and processing module determines the operating status of each circulating pump in real time based on the monitored current changes (if the current value is between 0 and the rated current value, it is in the start-up or stop state; if the current value is equal to the rated current value or the difference between the current value and the rated current value is within a set range, it is in the running state). If two circulating pumps are switched at this time, circulating pump P01 (first circulating pump 13) enters the stop state and circulating pump P02 (second circulating pump 23) enters the start state. The current signal collected by the first current sensor 14 is then changed from the rated current. As the current gradually decreases to 0, the current signal collected by the second current sensor 24 gradually increases from 0 to the rated current value. The data acquisition and processing module sends continuous sampling commands to channels 1 and 2 of the data acquisition unit based on the received current value changes, continuously collecting vibration data and storing it in the corresponding database in real time. This continues until the first current sensor 14 detects that the current of the P01 circulating pump (first circulating pump 13) becomes 0 and the current of the P02 circulating pump (second circulating pump 23) reaches the rated value. At this point, the data acquisition and processing module sends single sampling commands to channels 1 and 2 of the data acquisition unit, completing the vibration data acquisition during the main circulating pump switching process. The specific process is as follows: Figure 3 As shown.
[0040] This invention collects the current of the main circulation pump motor using a current sensor, determines the operating state of the main circulation pump based on the current status, and then the data acquisition system controls the data acquisition unit to perform single and continuous sampling according to the operating state of the main circulation pump. This obtains vibration acceleration data of the main circulation pump under different operating states, and stores the vibration acceleration data in the corresponding database according to the operating state of the main circulation pump for subsequent classification, processing, and analysis. This method can reliably distinguish, collect, and store vibration data during the start-up, shutdown, and stable operation of the main circulation pump, thereby effectively assessing the health status of the main circulation pump under different operating states.
[0041] Example 2:
[0042] Based on the vibration data acquisition method for the main circulating pump of a converter valve cooling system described in Embodiment 1, this embodiment provides a vibration data acquisition device for the main circulating pump of a converter valve cooling system, comprising:
[0043] The data acquisition unit is used to acquire the current signal of the main circulating pump of the converter valve cooling system through a current sensor;
[0044] The data acquisition and processing module is used to determine the working status of the main circulating pump of the converter valve cooling system based on the current signal of the main circulating pump of the converter valve cooling system.
[0045] The data acquisition device is also used to acquire the vibration signal of the main circulation pump of the converter valve cooling system through a vibration sensor at a set frequency corresponding to the working state of the main circulation pump of the converter valve cooling system.
[0046] The data acquisition and processing module is also used to store the vibration signal of the main circulating pump of the converter valve cooling system into the corresponding database according to the working status of the main circulating pump of the converter valve cooling system.
[0047] Example 3:
[0048] Based on the vibration data acquisition method for the main circulating pump of a converter valve cooling system described in Embodiment 1, and the vibration data acquisition device for the main circulating pump of a converter valve cooling system described in Embodiment 2, this embodiment provides a main circulating pump for a converter valve cooling system, including:
[0049] A first circulating pump 13, driven by a first motor 11, has its inlet connected to the return water pipe 3 of the converter valve cooling system and its outlet connected to the supply water pipe 4 of the converter valve cooling system. A second circulating pump 23, driven by a second motor 21, has its inlet connected to the return water pipe 3 of the converter valve cooling system and its outlet connected to the supply water pipe 4 of the converter valve cooling system. A first vibration sensor 15 is used to collect vibration signals from the first circulating pump 13. A second vibration sensor 25 is used to collect vibration signals from the second circulating pump 23. A first current sensor 14 is used to collect current signals from the first motor 11. A second current sensor 24 is used to collect current signals from the second motor 21. The first vibration sensor 15, the second vibration sensor 25, the first current sensor 14, and the second current sensor 24 are electrically connected to a data acquisition unit. The data acquisition unit is electrically connected to a data acquisition and processing module. The data acquisition and processing module is electrically connected to a database.
[0050] The data acquisition and processing module is used to determine the working status of the first circulating pump 13 in the main circulating pump of the converter valve cooling system based on the current signal of the first motor 11 in the main circulating pump of the converter valve cooling system; it is also used to determine the working status of the second circulating pump 23 in the main circulating pump of the converter valve cooling system based on the current signal of the second motor 21 in the main circulating pump of the converter valve cooling system; it is also used to store the vibration signal of the first circulating pump 13 in the main circulating pump of the converter valve cooling system into the corresponding database according to the working status of the first circulating pump 13 in the main circulating pump of the converter valve cooling system; and it is also used to store the vibration signal of the second circulating pump 23 in the main circulating pump of the converter valve cooling system into the corresponding database according to the working status of the second circulating pump 23 in the main circulating pump of the converter valve cooling system.
[0051] The data acquisition unit is used to acquire the vibration signal of the first circulating pump 13 in the main circulating pump of the converter valve cooling system according to a set frequency corresponding to the working state of the first circulating pump 13 in the main circulating pump of the converter valve cooling system; it is also used to acquire the vibration signal of the second circulating pump (23) in the main circulating pump of the converter valve cooling system according to a set frequency corresponding to the working state of the second circulating pump (23) in the main circulating pump of the converter valve cooling system; wherein, if the working state is the start state or the stop state, continuous sampling is performed according to the set continuous sampling frequency, the continuous sampling frequency refers to the sampling frequency of 10K / s to 14K / s; if the working state is the running state, sampling is performed according to the set single sampling frequency, the single sampling frequency refers to the sampling frequency of once every 6s to 10s.
[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.
Claims
1. A method for acquiring vibration data of the main circulating pump in a converter valve cooling system, characterized in that, include: Acquire the current signal of the main circulating pump in the converter valve cooling system; The operating status of the main circulating pump of the converter valve cooling system is determined based on the current signal of the main circulating pump. The vibration signal of the main circulation pump of the converter valve cooling system is collected according to the set frequency corresponding to the working state of the main circulation pump of the converter valve cooling system. The vibration signal of the main circulating pump of the converter valve cooling system is stored in the corresponding database according to the working status of the main circulating pump of the converter valve cooling system. The operating states of the main circulation pump of the converter valve cooling system include: start-up state, running state, and stop state; wherein, the start-up state refers to the process of the current signal of the main circulation pump of the converter valve cooling system increasing from zero to the rated current, and the stop state refers to the process of the current signal of the main circulation pump of the converter valve cooling system decreasing from the rated current to zero. Vibration signals of the main circulating pump of the converter valve cooling system are collected at a set frequency corresponding to the operating state of the main circulating pump, including: When the main circulation pump of the converter valve cooling system is in the start or stop state, it performs continuous sampling according to the set continuous sampling frequency. When the main circulation pump of the converter valve cooling system is in the running state, sampling is performed according to the set single sampling frequency; The continuous sampling frequency refers to a sampling frequency of 10K / s to 14K / s; the single sampling frequency refers to a sampling frequency of once every 6s to 10s.
2. The method for acquiring vibration data of the main circulating pump in the converter valve cooling system according to claim 1, characterized in that, The current signal is the A-phase, B-phase, or C-phase current signal of the three-phase motor of the main circulating pump of the converter valve cooling system.
Citation Information
Patent Citations
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