AU2022263510A1

AU2022263510A1 - Distributed synchronous condenser lubricating oil system and control method therefor

Info

Publication number: AU2022263510A1
Application number: AU2022263510A
Authority: AU
Inventors: Long Chen; Yanni Guo; Weixiong Huang; Zhong Jiang; Qiubao Wang; Hongxing YIN; Hongri ZHANG; Jie Zhong
Original assignee: Jiangsu Jianghai Lubrication & Hydraulic Equipment Co Ltd
Current assignee: Jiangsu Jianghai Lubrication & Hydraulic Equipment Co Ltd
Priority date: 2021-11-06
Filing date: 2022-11-02
Publication date: 2023-05-25
Also published as: CN113983340A; CN113983340B

Abstract

OF THE DISCLOSURE The present disclosure relates to a distributed synchronous condenser lubricating oil system and a control method therefor. The distributed synchronous condenser lubricating oil system comprises an oil supply pipeline, an oil tank for storing lubricating oil, a pumping assembly and a control center. A switching valve is arranged in the oil supply pipeline, a heating assembly is arranged at a first outlet of the switching valve, and an oil outlet pipe of the heating assembly communicates with the oil tank. A cooling device is arranged at a second outlet of the switching valve, and an oil outlet pipe of the cooling device communicates with the oil supply pipeline to cool lubricating oil and then convey the lubricating oil into the oil supply pipeline. The control center is electrically connected to the switching valve to control the switching valve to switch different outlets. ABSTRACT DRAWING Control 13 center 441 4412 4411 4 2 42 41 4221 1 1421 4 22 45 43 141 12 FIG. 1

Description

DISTRIBUTED SYNCHRONOUS CONDENSER LUBRICATING OIL SYSTEM AND CONTROL METHOD THEREFOR TECHNICAL FIELD

[0001] The present disclosure relates to the field of phase modifying equipment, and in particular relates to a distributed synchronous condenser lubricating oil system and a control method therefor.

BACKGROUND

[0002] Synchronous condenser is a synchronous motor in a special operating state. When used in the power system, the synchronous condenser, according to the needs of power system, automatically increases the reactive power output when the grid voltage drops and absorbs reactive power when the grid voltage rises to maintain the voltage, thereby improving the stability of power system and modifying the quality of system power supply.

[0003] The synchronous condenser serves as large rotary equipment. In order to guarantee the normal operation of the synchronous condenser, a lubricating system is needed for cooling and lubricating a bearing of its rotating shaft to guarantee the normal operation of the synchronous condenser. The lubricating system comprises a control center, an oil storage tank, an oil outlet pipe, an oil return pipe, an oil cooling device and a pumping device. One end of the oil outlet pipe is connected to the oil storage tank, and the other end is connected to one end of a bearing of a rotating shaft of the synchronous condenser. The other end of the bearing of the rotating shaft of the synchronous condenser communicates with the oil return pipe, the other end of the oil return pipe is connected to the oil cooling device, and the other end of the oil cooling device is connected to the oil storage tank. The pumping device is configured to supply oil to the synchronous condenser, the oil supply is that the pumping device pressurize the lubricating oil in the oil storage tank, such that the lubricating oil flows to the bearing of the rotating shaft of the synchronous condenser for lubrication through the oil outlet pipe and then is returned to the oil storage tank through the oil return pipe.

[0004] In the process of implementing the present disclosure, the inventor found that at least the following problems exist in such technology: when the synchronous condenser is used in an environment with large diurnal temperature difference, the temperature difference of oil liquid output by the oil outlet pipe is large, and the bearing of the synchronous condenser is easily damaged in the operation process of the synchronous condenser, leading to the damage of the synchronous condenser.

SUMMARY

[0005] To facilitate the reduction of vibration at a bearing and maintain the stable operation at the bearing, the present disclosure provides a distributed synchronous condenser lubricating oil system and a control method therefor.

[0006] In a first aspect, the present disclosure provides a distributed synchronous condenser lubricating oil system, which employs the following technical solution:

[0007] A distributed synchronous condenser lubricating oil system comprises an oil supply pipeline for supplying oil to a bearing of a synchronous condenser, an oil tank for storing lubricating oil, a pumping assembly for pumping the lubricating oil from the oil tank to the bearing of the synchronous condenser via the oil supply pipeline, and a control center for sending a control instruction. A switching valve is arranged in the oil supply pipeline, a heating assembly for heating the lubricating oil is arranged at a first outlet of the switching valve, and an oil outlet pipe of the heating assembly communicates with the oil tank. A cooling device is arranged at a second outlet of the switching valve, and an oil outlet pipe of the cooling device communicates with the oil supply pipeline so as to cool the lubricating oil and then convey the lubricating oil into the oil supply pipeline. The control center is electrically connected to the switching valve so as to control the switching valve to switch different outlets. An oil outlet temperature detection device for detecting oil outlet temperature and an oil return temperature detection device for detecting oil return temperature are arranged on the oil supply pipeline. The oil outlet temperature detection device and the oil return temperature detection device are electrically connected to the control center so as to transmit the oil outlet temperature and the oil return temperature to the control center. The control center is electrically connected to the heating assembly and the cooling device so as to regulate the temperature of the lubricating oil.

[0008] By employing the above technical solution, the heating assembly and the cooling device are controlled, by the control center, to adjust the lubricating oil according to the oil outlet temperature detected by the oil outlet temperature detection device and oil return temperature detected by the oil return temperature detection device. When the oil return temperature and the oil outlet temperature are both lower than a preset starting value, the control center controls switching valve to be switched to a first outlet to be opened and controls the heating assembly, and at the moment, the lubricating oil is heated by the heating assembly and then flows back to the oil tank, thus achieving the temperature rise of the lubricating oil, and the probability that the synchronous condenser is damaged by the vibration at the bearing due to overhigh viscosity of the lubricating oil is reduced. When the oil return temperature is higher than a cooling temperature value, the control center controls the switching valve to be switched to a second outlet to be opened and starts the cooling device, at the moment, the lubricating oil is cooled by the cooling device and then flows back to the oil tank for storage until next use, the temperature of the lubricating oil can be cooled to the normal temperature, thus playing a role in cooling the bearing while lubricating, and the probability that the synchronous condenser is damaged due to continuous temperature rise at the bearing is reduced.

[0009] Preferably, the oil supply pipeline is provided with an accident oil replenishing tank, a partition plate is arranged in the middle of the bottom of the accident oil replenishing tank, one side, located on the partition plate, of the accident oil replenishing tank is provided with an accident oil inlet pipe connected to the oil supply pipeline, and the other side of the accident oil replenishing tank is provided with an accident oil outlet connected to the oil supply pipeline so as to output the lubricating oil. The accident oil inlet pipe is provided with an oil inlet control valve, the accident oil outlet pipe is provided with an oil outlet control valve, and the oil supply pipeline is provided with an oil replenishing tank cut-in valve between the accident oil inlet pipe and the accident oil outlet pipe. An air chamber for pressurizing the lubricating oil in the accident oil replenishing tank is formed in the top of the accident oil replenishing tank, an air pipe for pressurizing the air chamber is arranged on the accident oil replenishing tank, a pressurizing control valve is arranged on the air pipe, an oil supply pressure detection device is arranged on the oil supply pipeline, and an air pressure detection device is arranged on the air chamber. The oil inlet control valve, the oil outlet control valve, the oil replenishing tank cut-in valve and the pressurization control valve are all electrically connected to the control center so as to connect the accident oil replenishing tank into the oil supply pipeline in series, and the oil supply pressure detection device and the air pressure detection device are both electrically connected to the control center so as to enable the pressure in the air chamber to be adapted to the pressure of the oil supply pipeline.

[0010] By employing the technical solution above, the accident oil replenishing tank can serve as an emergency standby for use in a case that the pumping assembly fails. The air is pressurized into the air chamber through the air pipe to make the air equal to pumped pressure, if the pumping assembly is damaged at the moment, the pressure in the air chamber can push the lubricating oil in the accident oil replenishing tank to temporarily supply oil to the bearing of the synchronous condenser, such that there is lubricating oil supply during the shutdown of the synchronous condenser. Due to the presence of the partition plate in the accident oil storage tank, a U-shaped cavity is formed inside the whole accident oil storage tank, and the lubricating oil is input into the accident oil storage tank via the accident oil inlet pipe and is output out of the accident oil outlet pipe via the accident oil outlet pipe, such that the lubricating oil can fully flow in the accident oil storage tank without causing the temperature of the lubricant oil inside the accident reservoir to be uneven, and the vibration at the bearing of the synchronous condenser caused by uneven temperature of the lubricating oil input by the accident oil replenishing tank to the oil supply pipeline when the pumping assembly fails suddenly can be avoided.

[00111 Preferably, the cooling device is an air-cooled heat exchanger. The air-cooled heat exchanger is provided with a cooling fan for cooling. The cooling fan is electrically connected to a frequency conversion device for controlling the operating frequency, and the control center is provided with an adjusting module for adjusting the operating frequency of the frequency conversion device. The adjusting module is electrically connected to a frequency calculation module for calculating the operating frequency.

[0012] By employing the technical solution above, because western areas with large diurnal temperature difference are scare in water resources, the cooling device adopts an air-cooled heat exchanger for cooling. Moreover, when the environment changes, in order to save energy, the frequency calculation module can calculate the proper operating frequency according to the oil outlet temperature and the oil return temperature and then send the proper operating frequency to the frequency adjustment module serving as the operating frequency of the cooling fan, thereby saving energy while guaranteeing the cooling effect.

[00131 Preferably, the frequency calculation module is electrically connected to an environmental parameter detection device for detecting environmental parameters. The environmental parameter detection device comprises an environment detection module for detecting the environmental parameters and a data collection module for collecting the environmental parameters. The frequency calculation module comprises an intelligent model module and a frequency output module. A data input end of the intelligent model module is electrically connected to the data collection module so as to receive the environmental parameters. The intelligent model module is configured to calculate the operating frequency by combining the environment parameters, the oil outlet temperature and the oil return temperature; the frequency output module is electrically connected to the adjusting module so as to adjust the cooling fan to cool at the operating frequency.

[00141 By employing the technical solution above, the data collection module can be configured to collect the environmental parameters detected by the environment detection module and to input the environmental parameters into the intelligent model module. The intelligent model module is configured to calculate the operating frequency of the environmental parameters, the oil outlet temperature and the oil return temperature in the current state based on a corresponding relationship among the environmental parameters, the oil outlet temperature, the oil return temperature and the operating frequency, and then the intelligent model module is configured to transmit the operating frequency to the frequency output module. The operating frequency is transmitted to the adjusting module through the frequency output module so as to control the cooling fan to operate at the calculated operating frequency, thereby obtaining one operating frequency automatically.

[00151 Preferably, the data collection module is electrically connected to a threshold comparison module. The threshold comparison module is configured to set a change rate threshold of the environment parameter, to calculate the change rate of the environment parameter, to compare the change rate of the environment parameter with the change rate threshold, and to output a comparison result. The threshold comparison module is electrically connected to a detection frequency setting module so as to set the detection frequency based on a corresponding relationship between the preset change rate and the detection frequency when receiving the comparison result.

[00161 By employing the technical solution above, the threshold comparison module is configured to set a change rate variance threshold of the environment parameter in advance, to calculate a change rate variance of the environmental parameter after setting the change rate variance threshold of the environment parameter, and to compare the change rate variance of the environment parameter with the change rate variance threshold of the environment parameter after obtaining the change rate variance of the environment parameter, thereby obtaining a comparison result. In a case that the change rate variance of the environment parameter is greater than the change rate variance threshold, it means that the change amplitude of the environment parameter is large, and the detection frequency needs to be increased at the moment. In a case that the change rate variance of the environment parameter is smaller than the change rate variance threshold, it means that the change amplitude of the environment parameter is small at the moment, and the detection frequency can be correspondingly reduced, thereby saving the energy.

[0017] Preferably, the cooling device further comprises a cooling pipe, cooling fins arranged on the cooling pipe, and an air outlet pipeline arranged on the cooling fan. The air outlet pipeline is arranged on one side of the cooling pipe, and an adjusting assembly for adjusting the size of an air outlet of the air outlet pipeline to adjust the air velocity is arranged on the air outlet pipeline. The adjusting assembly is electrically connected to a frequency output module so as to be started after the cooling fan operates at the maximum operating frequency.

[0018] By employing the technical solution above, the control center is configured to start the adjusting assembly when the cooling fan operates at the maximum operating frequency but the oil outlet temperature is still high. By adjusting the size of the air outlet of the air outlet pipeline, the air velocity exhausted by the cooling fan from the air outlet pipeline at the maximum operating frequency, namely the same air volume, is large, thereby increasing the heat exchange rate between the air and the cooling fins.

[0019] Preferably, the adjusting assembly comprises an air gathering hose arranged on the side, close to the cooling fins, of the air outlet pipeline, a tightening ring arranged on the side, away from the cooling fan, of the air gathering hose, and a tightening device for tightening the tightening ring. The tightening device is electrically connected to the frequency output module so as to be started after the cooling fan operates at the maximum working frequency.

[0020] By employing the technical solution above, the control center is configured to control the tightening device to tighten the tightening ring. As the tightening ring is arranged at one side of the air gathering hose and the air gathering hose is flexible, the opening at one end of the air gathering hose may be narrowed under the contraction of the tightening ring so as to limit the size of the air outlet of the air outlet pipeline. In a case of the same air volume, the air outlet is narrowed, the air velocity is improved, and therefore the air velocity blowing to the cooling fins can be improved so as to improve the heat exchange rate.

[0021] Preferably, the tightening device comprises a tightening rope threaded into the tightening ring, a fixed ring arranged at one end of the tightening rope and a driving part for contracting the tightening rope. A receding hole allowing the tightening rope to thread out is formed in one side of the air outlet pipeline, the end, away from the fixed ring, of the tightening rope threads out of the receding hole and is fixed to the driving part. The driving part is configured to wind the tightening rope so as to tighten the tightening ring, and the driving part is electrically connected to the frequency output module.

[0022] By employing the technical solution above, the frequency output module of the control center is configured to output a control instruction to the driving part, and the driving part is configured to wind the tightening rope. Due to the fact that the tightening rope threads into the tightening ring and threads out from the fixing ring, the tightening ring can be tightened during the tightening of the tightening rope, thereby adjusting the size of the air outlet of the air gathering hose to play a role in adjusting the air velocity.

[0023] In a second aspect, the present disclosure provides a control method for a distributed synchronous condenser lubricating oil system, which employs the following technical solution:

[0024] A control method for a distributed synchronous condenser lubricating oil system comprises the following steps:

[0025] controlling an oil outlet temperature detection device to detect oil outlet temperature of an oil supply pipeline;

[0026] when the oil outlet temperature is greater than a preset starting temperature, controlling the switching valve to be switched to a second outlet to be opened, and sending a starting allowing instruction to a synchronous condenser; and

[0027] in the process of pumping, by a pumping assembly, the lubricating oil from an oil tank to a bearing of the synchronous condenser via the oil supply pipeline, controlling a cooling device to cool the lubricating oil based on the oil outlet temperature and oil return temperature.

[0028] Preferably, after controlling an oil outlet temperature detection device to detect oil outlet temperature of an oil supply pipeline, the method further comprises:

[0029] when the oil outlet temperature is smaller than the preset starting temperature, controlling the switching valve to be switched to a first outlet to be opened; and

[0030] controlling a heating assembly to heat the lubricating oil.

[0031] In conclusion, the present disclosure comprises at least one of the following technical effects:

[0032] 1. By adopting the technology that an oil supply pipeline, an oil tank, a pumping assembly, a control center, a switching valve, a heating assembly, a cooling device, an oil outlet temperature detection device and an oil return temperature detection device are in cooperation, the temperature of the lubricating oil can be adjusted by the control center according to the oil outlet temperature and the oil return temperature, thereby keeping the lubricating oil at an appropriate temperature and reducing the damage to the synchronous condenser caused by temperature change.

[0033] 2. By adopting the technology that an accident oil replenishing tank, a partition plate, an accident oil inlet pipe, an accident oil outlet pipe, an oil inlet control valve, an oil outlet control valve, an oil replenishing tank cut-in valve, an air chamber, an air pipe, a pressurizing control valve and an oil supply pressure detection device are in cooperation, the lubricating oil replenished into the oil supply pipeline when the accident occurs can be maintained at a stable temperature.

[0034] 3. By adopting the technology that a cooling fan, a frequency conversion device, an adjusting module, a frequency calculation module, an intelligent model module, a frequency output module, a threshold comparison module, a detection frequency setting module, a cooling pipe, cooling fins, an air outlet pipeline, an adjusting assembly, an air gathering hose, a tightening ring, a tightening rope, a fixing ring, a driving part, a receding hole and a frequency output module are in cooperation, the cooling effect of the cooling fan can be adjusted conveniently.

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] FIG. 1 is a schematic diagram of an overall structure of a distributed synchronous condenser lubricating oil system in accordance with an embodiment of the present disclosure;

[0036] FIG. 2 is a schematic diagram illustrating the structure of a cooling device in accordance with an embodiment of the present disclosure;

[0037] FIG. 3 is a schematic diagram illustrating an internal structure of an air outlet pipeline in accordance with an embodiment of the present disclosure;

[0038] FIG. 4 is a schematic diagram illustrating the structure of an adjusting assembly in accordance with an embodiment of the present disclosure;

[0039] FIG. 5 is a structure block diagram illustrating the control relationship of a control center in accordance with an embodiment of the present disclosure;

[0040] FIG. 6 is a schematic diagram illustrating an internal structure of an accident oil storage tank in accordance with an embodiment of the present disclosure.

[0041] In the drawings: 1-oil supply pipeline; 11-oil tank; 12-pumping assembly; 13-control center; 14-switching valve; 141-heating assembly; 15-oil outlet temperature detection device;

16-oil return temperature detection device; 17-frequency conversion device; 2-cooling device; 21-cooling fan; 211-cooling pipe; 212-cooling fin; 213-air outlet pipeline; 2131-receding hole; 412-fixing frame; 22-adjusting assembly; 221-air gathering hose; 222-tightening ring; 23 tightening device; 231-tightening rope; 232-fixed ring; 233-driving part; 2331-roller; 3-adjusting module; 31-frequency calculation module; 311-intelligent model module; 312-frequency output module; 32-environment parameter detection device; 321-environment detection module; 322 data collection module; 33-threshold comparison module; 331-detection frequency setting module; 4-accident oil replenishing tank; 41-partition plate; 42-accident oil inlet pipe; 421-oil inlet control valve; 422-accident oil outlet pipe; 4221-oil outlet control valve; 43-oil replenishing tank cut-in valve; 44-air chamber; 441-air pipe; 4422-pressurizing control valve; 442-air pressure detection device; 45-oil supply pressure detection device.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The present disclosure is further described in detail below with reference to the accompanying drawings 1 to 6.

[0043] An embodiment of the present disclosure discloses a distributed synchronous condenser lubricating oil system. Referring to FIG. 1, a distributed synchronous condenser lubricating oil system comprises an oil supply pipeline 1, an oil tank 11, a pumping assembly 12 and a control center 13. The oil tank 11 is a hollow metal tank body for storing lubricating oil for lubricating a bearing of the synchronous condenser. The oil supply pipeline 1 is arranged at the bearing of the synchronous condenser from the oil tank 11 and configured to supply oil to the bearing of the synchronous condenser. The pumping assembly 12 is installed on the oil tank 11 and configured to pump the lubricating oil from the oil tank 11 to the bearing of the synchronous condenser via the oil supply pipeline 1. The pumping assembly 12 comprises a plurality of oil pumps. At least one of the oil pumps is powered by direct current. The control center 13 is configured to send a control instruction to one of the oil pumps of the pumping assembly 12 so as to control the oil pump in the pumping assembly 12 to be started for oil supply.

[0044] Referring to FIG. 1, a switching valve 14 is connected into the oil supply pipeline 1 by a flange. The switching valve 14 is provided with three outlets and one inlet, and the inlet of the switching valve 14 communicates with the oil supply pipeline 1. A heating assembly 141 for heating the lubricating oil is installed at a first outlet of the switching valve 14. The heating assembly 141 is an electric heater, and an oil outlet pipe of the heating assembly 141 communicates with the oil tank 11. When the switching valve 14 is switched to the first outlet to be opened, the lubricating oil in the oil supply pipeline 1, after being heated by the heating assembly 141, flows back to the oil tank 11.

[0045] Referring to FIG. 1 and FIG. 2, a cooling device 2 is installed at a second outlet of the switching valve 14, and an oil outlet pipe of the cooling device 2 communicates with the oil supply pipeline 1 so as to cool the lubricating oil and then convey the lubricating oil into the oil supply pipeline 1. The cooling device 2 is an air-cooled heat exchanger. The air-cooled heat exchanger is provided with a cooling fan 21 for cooling, and the cooling fan 21 rotates to promote the air to flow towards the heat exchanger, thereby facilitating the heat exchange with the heat exchanger.

[0046] Referring to FIG. 2, the cooling device 2 further comprises a cooling pipe 211, cooling fins 212 and an air outlet pipeline 213. The cooling pipe 211 is a metal hollow rigid pipe, one end of the cooling pipe is connected to the second outlet of the switching valve 14, and the other end of the cooling pipe is connected to the oil supply pipeline 1 by a flange. The cooling fins 212 are fixedly welded to the outer side wall of the cooling pipe 211, thus conducting the heat in the cooling pipe 211 to the cooling fins 212 to be transferred outwards. The cooling device 2 further comprises a fixing frame 214, and the cooling pipe 211 with the cooling fins 212 fixed thereto is fixed into the fixing frame 214. A plurality of cooling fins 212 are vertically provided and uniformly arranged in a length direction of the fixing frame 214. The cooling fan is installed in the air outlet pipeline 213, and the air outlet pipeline 213 is configured to gather the air exhausted from the cooling fan. The air outlet pipeline 213 is installed on the side wall of one side of the fixing frame 214, and the air blown out by the cooling fan penetrates through a gap between two adjacent cooling fins 212, thereby facilitating the heat exchange.

[0047] Referring to FIG. 2 and FIG. 3, an adjusting assembly 22 for adjusting the size of the air outlet of the air outlet pipeline 213 so as to adjust the air velocity is installed on the air outlet pipeline 213. The adjusting assembly 22 comprises an air gathering hose 221, a tightening ring 222 and a tightening device 23. The air gathering hose 221 is a flexible plastic hose, one end of the air gathering hose 221 is adhesively fixed to the inner wall of the air outlet pipeline 213 by a bolt and is installed on one side, close to the cooling fins 212, of the air outlet pipeline 213. One end, far away from the cooling fan, of the air gathering hose 221 is wound and adhesively fixed to form the tightening ring 222, and an opening is formed in one side of the tightening ring 222.

[0048] Referring to FIG. 3 and FIG. 4, the tightening device 23 comprises a tightening rope 231, a fixing ring 232 and a driving part 233. The fixing ring 232 is tied to one end of the tightening rope 231, one end of the tightening rope 231 without the fixing ring 232 threads into the tightening ring 222 from the opening, and then threads into the fixing ring 232 after surrounding the tightening ring 222 for a circle. A receding hole 2131 for allowing the tightening rope 231 to thread out is formed in one side of the air outlet pipeline 213, and the tightening rope 231 threads through the receding hole 2131 after threading out from the fixing ring. The driving part 233 is fixed to an outer side wall of the air outlet pipeline 213. The driving part 233 may be a servo motor with a roller 2331 on an output shaft, and the tightening rope 231 is fixed to the roller 2331 after threading out from the receding hole 2131. The driving part 233 is configured to wind the tightening rope 231 so as to tighten the tightening ring 222, such that an opening at one end, away from the cooling fan 21, of the air gathering hose 221 can be adjusted so as to adjust the air velocity of the air coming out from the air gathering hose 221.

[0049] Referring to FIG. 1 and FIG. 5, the control center 13 is electrically connected to the switching valve 14 so as to control the switching valve 14 to be switched, thereby performing state switching. An oil outlet temperature detection device 15 for detecting oil outlet temperature and an oil return temperature detection device 16 for detecting oil return temperature are installed on the air supply pipeline 1, and the oil outlet temperature detection device 15 and the oil return temperature detection device 16 may both be temperature sensors. The oil outlet temperature detection device 15 and the oil return temperature detection device 16 are both electrically connected to the control center 13 so as to transmit the oil outlet temperature and the oil return temperature to the control center 13. The control center 13 is electrically connected to a heating assembly 141 and a cooling device 2 so as to control the switching valve 14 to open a first outlet to heat the lubricating oil when the oil outlet temperature is lower than a preset value, to control the first outlet to be closed after the oil outlet temperature is higher than the preset value, and to control the second outlet to be opened to heat the lubricating oil, thus adjusting the temperature of the lubricating oil.

[0050] Referring to FIG. 1 and FIG. 5, the cooling fan 21 is electrically connected to a frequency conversion device 17 for controlling the operating frequency, and the frequency conversion device 17 may be a frequency converter. An adjusting module 3 for adjusting the operating frequency of the frequency conversion device 7 is arranged inside the control center 13; the adjusting module 3 is electrically connected to a frequency calculation module 31 for calculating the operating frequency. The frequency conversion device 17 is controlled by the adjusting module 3 to operate at the operating frequency according to the operating frequency calculated by the frequency calculation module 31, thereby adjusting a rotational speed of the cooling fan 21 by means of the frequency conversion device 17.

[0051] Referring to FIG. 1 and FIG. 5, the frequency calculation module 31 is electrically connected to an environmental parameter detection device 32 for detecting environmental parameters. The environmental parameter detection device 32 comprises an environment detection module 321 for detecting the environmental parameters and a data collection module 322 for collecting the environmental parameters. The environment detection module 321 comprises a temperature sensor, a humidity sensor and an air velocity sensor. The data collection module 322 is in signal connection with the temperature sensor, the humidity sensor and the air velocity sensor one by one so as to collect environmental parameters such as environmental temperature, environmental humidity and environmental air velocity.

[0052] Referring to FIG. 1 and FIG. 5, the frequency calculation module 31 comprises an intelligent model module 311 and a frequency output module 312. An artificial intelligent prediction model which is trained according to a corresponding relationship among the environmental parameters, the oil outlet temperature, the oil return temperature and the operating frequency in advance is loaded in the intelligent model module 311. A data input end of the intelligent model module 311 is electrically connected to the data collection module 322 so as to receive the environmental parameters. When the environmental parameters are sent to the intelligent model module 311 by the data collection module 322, the intelligent model module 311 is configured to obtain the oil outlet temperature and the oil return temperature and to calculate the operating frequency. The frequency output module 312 is electrically connected to the intelligent model module 311 so as to receive the operating frequency and is electrically connected to the adjusting module 3 so as to transmit the operating frequency to the adjusting module 3, thereby adjusting the cooling fan 21 to dissipate heat at the operating frequency. The driving part 233 is electrically connected to the frequency output module 312. When the cooling fan 21 operates at the maximum frequency, a signal is sent, by the frequency output module 312, to the driving part 233 to control the driving part 233 to be started, thereby adjusting the air velocity at the air outlet position of the air gathering hose 221.

[0053] Referring to FIG. 1 and FIG. 5, the driving part 233 in the adjusting assembly 22 is electrically connected to the frequency output module 312 so as to be started after the cooling fan 21 operates at the maximum operating frequency. By adjusting the size of the air outlet, the air velocity is adjusted in a case of the same air volume so as to improve the heat exchange efficiency.

[0054] Referring to FIG. 5, the data collection module 322 is electrically connected to a threshold comparison module 33. A change rate variance threshold is set in the threshold comparison module 33, the threshold comparison module 33 can be configured to set the change rate variance threshold of the environmental parameter, and to calculate the change rate variance of the environment parameter after setting the change rate variance threshold. After the change rate variance of the environmental parameter is calculated, the change rate variance of the environmental parameter is compared with a change rate variance threshold value, and then a comparison result is output. The threshold comparison module 33 is electrically connected to a detection frequency setting module 331. The detection frequency setting module 331 is configured to set the detection frequency based on a corresponding relationship between the preset change rate and the detection frequency when receiving the comparison result, thereby reducing the detection frequency when the change rate is small in change, and reducing the energy consumption of the detection.

[0055] Referring to FIG. 1 and FIG. 6, a third outlet of the switching valve 14 directly communicates with the oil supply pipeline 1 for maintenance and use when the pipeline is in failure. An accident oil replenishing tank 4 is installed on the oil supply pipeline 1. A partition plate 41 is fixedly welded to the middle of the bottom of the accident oil replenishing tank 4; an accident oil inlet pipe 42 connected to the oil supply pipeline 1 is integrally formed on one side, located on the partition plate 41, of the accident oil replenishing tank 4, and an accident oil outlet pipe 422 connected to the oil supply pipeline 1 to output lubricating oil is integrally formed on the other side of the accident oil replenishing tank 4. An oil inlet control valve 421 is installed on the accident oil inlet pipe 42, the accident oil inlet pipe 42, after being connected to the oil inlet control valve 421, is connected to the oil supply pipeline 1. An oil outlet control valve 4221 is installed on the accident oil outlet pipe 422, and the accident oil outlet pipe 422, after being connected to the oil outlet control valve 4221, is connected to the oil supply pipeline 1 so as to connect the accident oil replenishing tank 4 into the oil supply pipeline 1 in series. The oil supply pipeline 1 is provided with an oil replenishing tank cut-in valve 43 between the accident oil inlet pipe 42 and the accident oil outlet pipe 422. In a case of the normal oil circuit, the oil replenishing tank cut-in valve 43 is opened by the control center 13, such that the lubricating oil can be conveyed from the oil replenishing tank cut-in valve 43 to the bearing of the synchronous condenser. Then the oil inlet control valve 421 is opened by the control center 13 slowly, such that the liquid level in the accident oil replenishing tank 41 slowly rises to an air-liquid interface, then the oil replenishing tank cut-in valve 43 is slowly closed while the oil outlet control valve 4221 is slowly opened, and at the moment, the accident oil replenishing tank 4 cuts into the oil supply pipeline 1.

[0056] Referring to FIG. 1 and FIG. 5, an air chamber 44 for pressurizing the lubricating oil in the accident oil replenishing tank 4 is arranged at the top of the accident oil replenishing tank 4; an air pipe 441 for pressurizing the air chamber 44 is integrally formed at the top of the accident oil replenishing tank 4. The air pipe 441 is configured to connect a pressurizing air pump to maintain the air pressure inside the accident oil replenishing tank 4. A pressurizing control valve 4422 is installed on the air pipe 441. An oil supply pressure detection device 45 is installed on the oil supply pipeline 1, an air pressure detection device 442 is arranged on the air chamber 44. The oil inlet control valve 421, the oil outlet control valve 4221, the oil replenishing tank cut-in valve 43 and the pressurizing control valve 4422 are all electrically connected to the control center 13 so as to connect the accident oil replenishing tank 4 into the oil supply pipeline 1 in series. The oil supply pressure detection device 45 and the air pressure detection device 442 are electrically connected to the control center 13 so as to make the pressure in the air chamber 44 be adapted to the pressure of the oil supply pipeline 1.

[0057] The implementation principle of a distributed synchronous condenser lubricating oil system in accordance with the embodiment of the present disclosure is as follows:

[0058] Before the synchronous condenser is started, the control center 13 is configured to control the pumping assembly 12 to be started in advance, and the pumping assembly 12 is configured to provide power for the circulation of the lubricating oil in the oil tank 11. Then the control center 13 is configured to control the oil outlet detection device to detect the oil outlet temperature. When the oil outlet temperature is lower than the preset lowest starting temperature, the switching valve 14 is controlled by the control center 13 to be switched to a first outlet to be opened. Meanwhile, the heating assembly 141 is controlled by the control center 13 to heat the lubricating oil, and the heated lubricating oil flows back to the oil tank 11, thereby achieving rapid temperature rise of the lubricating oil in the oil tank 11.

[0059] After the lubricating oil in the oil tank 11 is heated to the starting oil temperature, the switching valve 14 is controlled by the control center 13 to close the first outlet and to open the second outlet, and at the moment, the lubricating oil is pumped to the bearing of the synchronous condenser via the oil supply pipeline. Then, a starting allowing instruction is sent to the synchronous condenser by the control center 13, and at the moment, the synchronous condenser can be started. After the synchronous condenser is started, the bearing of the synchronous condenser may generate heat due to the friction generated by lubrication. When the lubricating oil passes through the bearing, on one hand, the bearing is lubricated, and on the other hand, the lubricating oil exchanges heat with the bearing, thus taking away the heat at the bearing.

[0060] When the oil outlet detection device 15 detects that the oil outlet temperature is higher than a preset cooling value, the cooling fan in the cooling device 2 is controlled to be started by the control center 13, and the cooling fan promotes airflow so as to promote the air to exchange heat with the cooling fins. When the oil outlet detection device 15 detects that the oil outlet temperature rises continuously, the environmental parameters and the oil outlet temperature are transmitted to the intelligent model module 311 by the control center 13, and thus the calculated operating frequency is output to the heat radiation fan 21 by the frequency output module 312. The cooling fan 21 operates at the operating frequency to improve the operating frequency, thereby improving the cooling efficiency. Therefore, the temperature of the lubricating oil in the lubrication system can be located within a proper range, and the problem of lubrication of the lubrication system in an environment with large diurnal temperature difference is solved.

[0061] A control method for a distributed synchronous condenser lubricating oil system is further disclosed by an embodiment of the present disclosure. The control method for the distributed synchronous condenser lubricating oil comprises the following steps:

[0062] S601, an oil outlet temperature detection device 15 is controlled to detect oil outlet temperature of an oil supply pipeline 1.

[0063] During implementation, before the synchronous condenser is started, the oil outlet detection device is controlled by the control center 13 to detect the oil outlet temperature, and due to the fact that viscosity of the lubricating oil is high when the oil temperature is lower than the starting temperature, the lubricating oil cannot achieve good lubrication effect.

[0064] S602, When the oil outlet temperature is greater than the preset starting temperature, the switching valve 14 is controlled to be switched to a second outlet to be opened, and a starting allowing instruction is sent to a synchronous condenser.

[0065] During implementation, when the oil outlet temperature detected by the oil outlet detection device controlled by the control center 13 is greater than the preset starting temperature, the switching valve 14 is controlled by the control center 13 to be switched to a second outlet to be opened, and at the moment, there is no need to heat the lubricating oil, representing that the synchronous condenser can be started. At the moment, the starting allowing instruction is sent to the synchronous condenser by the control center, and the synchronous condenser can be started only after receiving the starting allowing instruction, thus the normal operation of the synchronous condenser is guaranteed.

[0066] S603, In the process of pumping, by a pumping assembly 12, the lubricating oil from an oil tank 11 to a bearing of the synchronous condenser via the oil supply pipeline 1, a cooling device 2 is controlled to cool the lubricating oil based on the oil outlet temperature and oil return temperature.

[0067] During implementation, when the oil outlet detection device 15 detects that the oil outlet temperature is higher than a preset cooling value, the cooling fan in the cooling device 2 is controlled to be started by the control center 13, and the cooling fan promotes airflow so as to promote the air to exchange heat with the cooling fins. When the oil outlet detection device 15 detects that the oil outlet temperature rises continuously, the environmental parameters and the oil outlet temperature are transmitted to the intelligent model module 311 by the control center 13, and thus the calculated operating frequency is output to the heat radiation fan 21 by the frequency output module 312. The cooling fan 21 operates at the operating frequency to improve the operating frequency, thereby improving the cooling efficiency. Therefore, the temperature of the lubricating oil in the lubrication system can be located within a proper range, and the problem of lubrication of the lubrication system in an environment with large diurnal temperature difference is solved.

[0068] Alternatively, to guarantee that the temperature of the lubricating oil can rise to the temperature at which the synchronous condenser can be started, the method further comprises the following processing after step S601 accordingly:

[0069] When the oil outlet temperature is smaller than the preset starting temperature, the switching valve 14 is controlled to be switched to a first outlet to be opened.

[0070] During implementation, when the oil outlet temperature is lower than the preset lowest starting temperature, the switching valve 14 is controlled by the control center 13 to be switched to the first outlet to be opened, and at the moment, the lubricating oil can flow out via the first outlet.

[0071] A heating assembly 141 is controlled to heat the lubricating oil.

[0072] During implementation, the control center 13, after controlling to open the first outlet, is configured to control the heating assembly 141 to heat the lubricating oil, the heated lubricating oil flows back to the oil tank 11, thereby achieving rapid temperature rise of the lubricating oil in the oil tank 11.

[0073] The above are preferred embodiments of the present disclosure and do not limit the scope of protection of the present disclosure as such, so equivalent changes made in accordance with the structure, shape and principle of the present disclosure are intended to be encompassed within the scope of protection of the present disclosure.

[0074] It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country.

[0075] In the claims which follow and in the preceding description, except where the context requires otherwise due to express language or necessary implication, the word "comprise" or variations such as "comprises" or "comprising" is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments

Claims

WHAT IS CLAIMED IS:

1. A distributed synchronous condenser lubricating oil system, comprising an oil supply pipeline for supplying oil to a bearing of a synchronous condenser, an oil tank for storing lubricating oil, a pumping assembly for pumping the lubricating oil from the oil tank to the bearing of the synchronous condenser via the oil supply pipeline, and a control center for sending a control instruction; a switching valve is arranged in the oil supply pipeline, a heating assembly for heating the lubricating oil is arranged at a first outlet of the switching valve, and an oil outlet pipe of the heating assembly communicates with the oil tank; a cooling device is arranged at a second outlet of the switching valve, and an oil outlet pipe of the cooling device communicates with the oil supply pipeline so as to cool the lubricating oil and then convey the lubricating oil into the oil supply pipeline; the control center is electrically connected to the switching valve so as to control the switching valve to switch different outlets; an oil outlet temperature detection device for detecting oil outlet temperature and an oil return temperature detection device for detecting oil return temperature are arranged on the oil supply pipeline; the oil outlet temperature detection device and the oil return temperature detection device are electrically connected to the control center so as to transmit the oil outlet temperature and the oil return temperature to the control center; and the control center is electrically connected to the heating assembly and the cooling device so as to regulate the temperature of the lubricating oil.

2. The distributed synchronous condenser lubricating oil system according to claim 1, wherein the oil supply pipeline is provided with an accident oil replenishing tank, a partition plate is arranged in the middle of the bottom of the accident oil replenishing tank, one side, located on the partition plate, of the accident oil replenishing tank is provided with an accident oil inlet pipe connected to the oil supply pipeline, and the other side of the accident oil replenishing tank is provided with an accident oil outlet connected to the oil supply pipeline so as to output the lubricating oil; the accident oil inlet pipe is provided with an oil inlet control valve, the accident oil outlet pipe is provided with an oil outlet control valve, and the oil supply pipeline is provided with an oil replenishing tank cut-in valve between the accident oil inlet pipe and the accident oil outlet pipe; an air chamber for pressurizing the lubricating oil in the accident oil replenishing tank is formed in the top of the accident oil replenishing tank, an air pipe for pressurizing the air chamber is arranged on the accident oil replenishing tank, a pressurizing control valve is arranged on the air pipe, an oil supply pressure detection device is arranged on the oil supply pipeline, and an air pressure detection device is arranged on the air chamber; the oil inlet control valve, the oil outlet control valve, the oil replenishing tank cut-in valve and the pressurization control valve are all electrically connected to the control center so as to connect the accident oil replenishing tank into the oil supply pipeline in series, and the oil supply pressure detection device and the air pressure detection device are both electrically connected to the control center so as to enable the pressure in the air chamber to be adapted to the pressure of the oil supply pipeline.

3. The distributed synchronous condenser lubricating oil system according to claim 1, wherein the cooling device is an air-cooled heat exchanger, the air-cooled heat exchanger is provided with a cooling fan for cooling, the cooling fan is electrically connected to a frequency conversion device for controlling the operating frequency, and the control center is provided with an adjusting module for adjusting the operating frequency of the frequency conversion device; and the adjusting module is electrically connected to a frequency calculation module for calculating the operating frequency.

4. The distributed synchronous condenser lubricating oil system according to claim 3, wherein the frequency calculation module is electrically connected to an environmental parameter detection device for detecting environmental parameters; the environmental parameter detection device comprises an environment detection module for detecting the environmental parameters and a data collection module for collecting the environmental parameters; the frequency calculation module comprises an intelligent model module and a frequency output module; a data input end of the intelligent model module is electrically connected to the data collection module so as to receive the environmental parameters; the intelligent model module is configured to calculate the operating frequency by combining the environment parameters, the oil outlet temperature and the oil return temperature; the frequency output module is electrically connected to the adjusting module so as to adjust the cooling fan to cool at the operating frequency.

5. The distributed synchronous condenser lubricating oil system according to claim 4, wherein the data collection module is electrically connected to a threshold comparison module; the threshold comparison module is configured to set a change rate threshold of the environment parameter, to calculate the change rate of the environment parameter, to compare the change rate of the environment parameter with the change rate threshold, and to output a comparison result; the threshold comparison module is electrically connected to a detection frequency setting module so as to set the detection frequency based on a corresponding relationship between the preset change rate and the detection frequency when receiving the comparison result.

6. The distributed synchronous condenser lubricating oil system according to claim 4, wherein the cooling device further comprises a cooling pipe, cooling fins arranged on the cooling pipe, and an air outlet pipeline arranged on the cooling fan; the air outlet pipeline is arranged on one side of the cooling pipe, and an adjusting assembly for adjusting the size of an air outlet of the air outlet pipeline to adjust the air velocity is arranged on the air outlet pipeline; and the adjusting assembly is electrically connected to a frequency output module so as to be started after the cooling fan operates at the maximum operating frequency.

7. The distributed synchronous condenser lubricating oil system according to claim 6, wherein the adjusting assembly comprises an air gathering hose arranged on the side, close to the cooling fins, of the air outlet pipeline, a tightening ring arranged on the side, away from the cooling fan, of the air gathering hose, and a tightening device for tightening the tightening ring; the tightening device is electrically connected to the frequency output module so as to be started after the cooling fan operates at the maximum working frequency.

8. The distributed synchronous condenser lubricating oil system according to claim 7, wherein the tightening device comprises a tightening rope threaded into the tightening ring, a fixed ring arranged at one end of the tightening rope and a driving part for contracting the tightening rope; a receding hole allowing the tightening rope to thread out is formed in one side of the air outlet pipeline, the end, away from the fixed ring, of the tightening rope threads out of the receding hole and is fixed to the driving part; the driving part is configured to wind the tightening rope so as to tighten the tightening ring , and the driving part is electrically connected to the frequency output module.

9. A control method used in the distributed synchronous condenser lubricating oil system according to any one of claims 1 to 8, comprising: controlling an oil outlet temperature detection device to detect oil outlet temperature of an oil supply pipeline; when the oil outlet temperature is greater than a preset starting temperature, controlling the switching valve to be switched to a second outlet to be opened, and sending a starting allowing instruction to a synchronous condenser; and in the process of pumping, by a pumping assembly, the lubricating oil from an oil tank to a bearing of the synchronous condenser via the oil supply pipeline, controlling a cooling device to cool the lubricating oil based on the oil outlet temperature and oil return temperature.

10. The control method for the distributed synchronous condenser lubricating oil system according to claim 9, wherein after controlling an oil outlet temperature detection device to detect the oil outlet temperature of the oil supply pipeline, the control method further comprises: when the oil outlet temperature is smaller than the preset starting temperature, controlling the switching valve to be switched to a first outlet to be opened; and controlling a heating assembly to heat the lubricating oil.