CN113669243B - Control system and method for high-pressure oil jacking device of pumped storage unit - Google Patents
Control system and method for high-pressure oil jacking device of pumped storage unit Download PDFInfo
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- CN113669243B CN113669243B CN202110954438.3A CN202110954438A CN113669243B CN 113669243 B CN113669243 B CN 113669243B CN 202110954438 A CN202110954438 A CN 202110954438A CN 113669243 B CN113669243 B CN 113669243B
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- 238000003860 storage Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 26
- 230000002159 abnormal effect Effects 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 9
- 230000003111 delayed effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000006378 damage Effects 0.000 claims description 2
- 230000011664 signaling Effects 0.000 claims 1
- 239000003921 oil Substances 0.000 description 176
- 230000002572 peristaltic effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009528 severe injury Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
- F04B49/022—Stopping, starting, unloading or idling control by means of pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/10—Other safety measures
- F04B49/103—Responsive to speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
- F16N29/04—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems enabling a warning to be given; enabling moving parts to be stopped
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
- F16N7/30—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the oil being fed or carried along by another fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2207/00—External parameters
- F04B2207/70—Warnings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2207/00—External parameters
- F04B2207/70—Warnings
- F04B2207/703—Stopping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N2210/00—Applications
- F16N2210/14—Bearings
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The invention discloses a control system of a high-pressure oil jacking device of a pumped storage unit, which comprises the following components: the high-pressure oil jacking device comprises an alternating current pump and a direct current pump, wherein the alternating current pump is a main pump, the direct current pump is a standby pump, the input end of the control module is connected with a unit state acquisition module, and the control module is used for controlling the operation of the alternating current pump or the direct current pump to jet high-pressure oil when the unit is in a start-stop state and a creeping state; the oil level monitoring element is arranged in the oil collecting tank, and the output end of the oil level monitoring element is connected with the control module; and the control module is used for prohibiting the unit from starting to operate when the oil level is abnormal according to the oil level signal. The invention has the advantages that: the control system of the high-pressure oil jacking device can more accurately and reliably realize starting and stopping, so that reliable oil is provided for the operation of the unit; and the reliable operation of the system is ensured by adopting the main oil pump and the standby oil pump.
Description
Technical Field
The invention relates to the field of hydroelectric generation, in particular to a control system and a control method for a high-pressure oil jacking device of a pumped storage unit.
Background
The thrust bearing of the hydraulic generator is provided with a high-pressure oil jacking device, which has important significance. When the hydraulic generator is in normal operation, the thrust bearing has liquid friction. Under otherwise identical conditions, the wedge oil film thickness between the bushing and the mirror plate is inversely proportional to the unit pressure. In a large-sized hydroelectric generating set with large thrust load, the wedge-shaped oil film between the mirror plate and the bearing bush becomes thinner as the unit load increases. In particular, in the starting and stopping processes, dry friction is more easily generated during low-rotation-speed operation, so that the bearing bush is severely worn, and even the unit cannot operate. The unit pressure of the thrust bearing of some units is not high, but the axial surface is easy to generate mechanical deformation due to the large area of the thrust bearing, so that an oil film between the bearing blocks is difficult to form. Running under such conditions can also cause severe damage to the bearing shell. When the unit is in load peak regulation task in the power grid, under the condition of frequent start-up and stop, the rotating speed is too low, so that an oil film is difficult to form between the bearing bushes, the bearing bushes are easy to wear, and the service life of the bearing bushes is shortened.
The high-pressure oil jacking device is specially designed for a hydraulic generator thrust bearing lubrication system, and is an important link in a hydraulic power station auxiliary machine control system, and the device has the function of spraying high-pressure oil on the surface of a thrust bearing when a unit is started and stopped, so that an oil film is formed on the surface of the thrust bearing, and the abrasion of a thrust tile is avoided. In general, the high-pressure oil jacking device is put into the machine set in the starting and stopping processes and in the peristaltic movement of the machine set. However, the input control mode is too simple, the control of the high-pressure oil jacking system/device cannot be accurately and reliably realized, and if the control of the high-pressure oil jacking system is inaccurate, the high-pressure oil cannot be provided for the operation of the unit, the operation safety accident of the pumped storage unit can be caused, so that the control system of the high-pressure oil jacking system of the pumped storage power station needs to be designed safely and reliably.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a control system and a control method for a high-pressure oil jacking device of a pumped storage unit, which are used for realizing reliable and accurate starting, running and closing of the high-pressure oil jacking system and ensuring the reliable running of the high-pressure oil jacking system.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the control system of the high-pressure oil jacking device of the pumped storage unit comprises a control module and an oil level monitoring element, wherein the high-pressure oil jacking device comprises an alternating current pump and a direct current pump, the alternating current pump is a main pump, the direct current pump is a standby pump, the input end of the control module is connected with a unit state acquisition module and is used for controlling the operation of the alternating current pump or the direct current pump to jet high-pressure oil when the unit is in a start-stop state and a creeping state; the oil level monitoring element is arranged in the oil collecting tank, and the output end of the oil level monitoring element is connected with the control module; and the control module is used for prohibiting the unit from starting to operate when the oil level is abnormal according to the oil level signal.
The output end of the control module is connected with a two-stage alarm system; the two-stage alarm system is used for sending out alarm signals and outputting tripping control signals to the unit at the same time so as to trip the unit.
The control module adopts a dual-power module and is used for controlling power supply of the control module.
The unit state acquisition module comprises a unit rotating speed acquisition module, the output end of the unit rotating speed acquisition module is connected with the control module, and the control module identifies the starting, stopping and creeping working states of the unit according to the unit rotating speed.
The starting control mode of the control module comprises two modes of remote automatic mode and local manual mode.
The oil pump output port pipelines of the alternating current pump and the direct current pump of the high-pressure oil jacking device are provided with an oil way pressure detection unit, the output end of the oil way pressure detection unit is connected with a control module, and the control module is used for controlling the alternating current pump and the direct current pump to switch and work and or sending out alarm signals or controlling the shutdown of a unit when an oil pressure signal is lower than a set lower limit value.
The alternating current pump or the direct current pump keeps running in an original state when the control module is powered off.
The control module is connected with the time delay module or the timing module and is used for realizing timing or time delay starting.
A control method of a high-pressure oil jacking device of a pumped storage unit comprises the following steps of
The upper computer monitoring unit sends out a command for starting high-pressure oil to jack up the oil pump when being in a start-stop state;
after receiving an instruction for starting the high-pressure oil pump, a control module of the high-pressure oil jacking device starts a self-checking program, judges whether the liquid level of the oil collecting tank is normal or not after the self-checking is free from faults, and if so, starts an alternating current pump to operate; if not, alarming the oil level in a two-stage alarming mode;
if the liquid level of the oil collecting tank is normal, the oil pressure signal of the oil outlet pipeline of the alternating current pump is monitored in real time after the alternating current pump is started, when the oil pressure signal is lower than a set threshold value, the direct current pump is switched to work, the oil pressure signal of the oil outlet pipeline of the direct current pump is monitored, and when the oil pressure of the direct current pump is lower than the set threshold value, a machine unit stop signal is sent out, and an alarm is given.
And the running state of the unit is monitored in real time, and when the unit is in a creeping state, the control module controls the alternating current pump and the direct current pump of the high-pressure oil jacking device to be started automatically.
And after the alternating current pump or the direct current pump is started to work, the rotating speed of the unit is monitored in real time, and when the rotating speed is larger than the set first rotating speed or smaller than the set second rotating speed, the alternating current pump or the direct current pump is controlled to stop.
The invention has the advantages that: the control system of the high-pressure oil jacking device can more accurately and reliably realize starting and stopping, so that reliable oil is provided for the operation of the unit; the reliable operation of the system is ensured by adopting the main oil pump and the standby oil pump; the self-starting under the creeping condition is adopted, so that the accurate oil protection of the unit during creeping is ensured; the system judges the oil liquid level and the oil pressure signals, can give an alarm in time and switch the main oil pump and the standby oil pump, and further ensures the reliable operation of the system.
Drawings
The contents of the drawings and the marks in the drawings of the present specification are briefly described as follows:
FIG. 1 is a logic diagram of the high-pressure oil jack-up start-stop control
FIG. 2 is a diagram showing the start-stop control of the high top oil pump according to the present invention;
FIG. 3 is a diagram showing the start-stop control of the main and standby pumps for jacking the high-lift oil.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings, which illustrate preferred embodiments of the invention in further detail.
The high-pressure oil jacking control system should adopt redundant configuration, and comprises a power supply and a PLC input/output module, and meanwhile, the system has automatic switching capability. The high-pressure jacking oil pump has three control modes of remote automation, local manual operation, cutting and the like. The high-pressure oil jacking device is provided with two oil pumps, one alternating-current oil pump is a main pump, and the other direct-current oil pump is a standby pump. The high-pressure oil pump motor starting mode comprises direct starting, soft starting and frequency converter starting; the direct start is to directly start the motor under the condition of full voltage; the soft start is mainly to share partial voltage drop by connecting variable resistors in a loop in series, and the voltage drop on the variable resistors is reduced along with the starting time, so that the high-voltage motor is started smoothly finally; the frequency converter is started by converting the power frequency alternating current power supply into direct current power supply through a rectifier by utilizing the pain-off effect of the silicon controlled rectifier element, then converting the direct current power supply into alternating current power supply with controllable frequency and voltage in a gradient mode, and supplying the alternating current power supply to the motor so as to achieve the purpose of stable starting. The monitoring system needs to monitor the state of the oil pump in real time. The oil collecting tank is a part in the high-pressure oil pump, the oil collecting tank is a container for containing oil, the oil level can be converted into an oil level value through a sensor, whether the oil level is met or not is judged by setting a fixed value, and when the oil level is not met, a unit is prohibited from starting to avoid burning the bearing bush. The high-pressure oil jacking control system is provided with an oil pressure monitoring element, two-stage alarming is arranged, a pressure switch (namely an oil pressure monitoring element) is adopted to realize two-stage alarming, the high-pressure oil jacking control system comprises an alarming pressure switch and a tripping pressure switch, the alarming pressure switch is connected in series in an alarming loop, the tripping pressure switch is connected in series in the tripping loop, when pressure reaches one-stage alarming, the alarming pressure switch is conducted, the alarming loop sends out alarming signals, and if the power supply loop which can be connected in series with an alarm is used for controlling the operation of the alarm through the pressure switch; when the pressure reaches the secondary alarm, the tripping pressure switch is conducted, the tripping circuit is conducted, and after the tripping circuit is conducted to supply power, the tripping system works and is controlled. The first level is alarm, the second level is trip, when the oil pressure is not satisfied, the unit is forbidden to start so as to avoid burning the bearing bush. The oil pump control system fails or the power source disappears, and the bearing oil pump should normally operate (the control system power source is separated from the oil pump power source, when the control loop power source disappears, the oil pump power source can still normally supply power, and the normal operation can be continued as long as the pump stopping loop is not conducted). When the main oil pump runs, the oil pressure is not satisfied, and the high-pressure oil jacking control system should automatically control the starting of the backup oil pump.
In order to ensure the safety starting principle of the high-pressure oil jacking system, the application adopts the scheme that:
(1) And when the rotating speed of the unit is lower than 90% of the rated rotating speed, the high-pressure oil jacking device is completely stopped.
(2) The oil pressure of the high-pressure oil jack-up device does not meet the condition, and the unit is prevented from starting up to rotate.
(3) When the speed measuring device is in fault or the rotating speed signal is abnormal, the high-pressure oil jacking device is ensured to be started.
To ensure reliable operation of the system:
(1) The high-pressure oil jacking device can be combined with other oil pump control systems by a set of PLC, and hard-wired control can also be adopted.
(2) The PLC power supply module is preferably a dual-power supply module, and the control power supply of the PLC power supply module is preferably a dual-power supply. If hard wiring is adopted, the control system should also supply power in two ways. The dual power supply modules are two paths of power supply inputs, mutually redundant and one path of power supply output. When the dual power supply module judges that the power supply output in use is faulty through the node signal or the voltage signal, the dual power supply module can be automatically switched to another power supply.
(3) The control mode of the high-pressure jacking device should be provided with two modes of remote automation and local manual operation. The local manual control loop is preferably hard-wired.
(4) The peristaltic phenomenon of the unit occurs, and the high-pressure oil jacking device is started automatically. The creep determination can be performed by a unit rotation speed signal, and the creep determination is performed under the condition that the speed is less than a certain speed and the small rotation speed is kept, or the unit is used for specifically measuring the creep, wherein the determination conditions include but are not limited to the rotation speed signal.
(5) The high-pressure oil jacking device is provided with two oil pumps, one alternating-current oil pump and one direct-current oil pump. The DC pump is used as a standby of the AC pump. When the main oil pump runs, the oil pressure is not satisfied, and the high-pressure oil jacking device should automatically control the starting of the backup oil pump.
(6) The oil pump outlet pressure of the high-pressure oil jack-up device is provided with an analog measuring point, and the pressure is used as a necessary condition for the start-up process. In the high-pressure oil jacking operation process of the thrust bearing of the unit, the lower limit signal is set for the oil way pressure measuring point to act on alarm and delay to act on shutdown. The fixed value should be set reasonably according to the recommended value designed by the manufacturer and the actual situation on site.
(7) The high-pressure oil jacking device ensures that the oil pump keeps running in an original state when the control system loses power. The control system of the high-pressure oil jacking device is preferably provided with an independent power switch, so that the control power loss caused by faults of other auxiliary equipment is avoided. The control system power supply is separated from the oil pump power supply, when the control loop power supply disappears, the oil pump power supply can still normally supply power, and the normal operation can be continued as long as the pump stopping loop is not conducted
(8) The high pressure oil jack-up device should be capable of stopping in a delayed manner or starting in a timed manner according to the condition of the host. Realize the purpose of delay stop and timing start: stopping the high-pressure oil jacking device when the rotating speed is more than 90%, and repeatedly starting and stopping the high-pressure oil jacking device in a short time to cause equipment damage if no time delay exists and the rotating speed is more than 90% and the signal jitter is unstable. The principle is that the pump stopping loop can be delayed to be conducted by utilizing the delay relay to set time.
4. Input/output signal
(1) Input signal:
the high-pressure oil jacking device pressure, the high-pressure oil jacking device pressure low tripping operation, the high-pressure oil jacking device alternating current pump voltage vanishes, the high-pressure oil jacking device direct current pump voltage vanishes, the high-pressure oil jacking device is in a manual position, the high-pressure oil jacking device is in an automatic position, the high-pressure oil jacking device is in an operating state, the high-pressure oil jacking device is in a stop state, the high-pressure oil jacking device alternating current/direct current pump failure, the rotating speed is less than 1%, the rotating speed is greater than 90%, the high-pressure oil jacking device is started when the machine is started, and the high-pressure oil jacking device is stopped when the machine is started.
(2) And (3) outputting a signal:
the high-pressure oil jacking device has normal pressure, the high-pressure oil jacking device has low pressure tripping operation, the alternating current pump voltage of the high-pressure oil jacking device is disappeared, the direct current pump voltage of the high-pressure oil jacking device is disappeared, the high-pressure oil jacking device is at a manual position, the high-pressure oil jacking device is at an automatic position, the high-pressure oil jacking device is in an operating state, the high-pressure oil jacking device is in a stop state, the high-pressure oil jacking device has driving failure, the high-pressure oil jacking device has alternating current/direct current pump failure, the high-pressure oil jacking device is in an alternating current pump operating mode and the high-pressure oil jacking device is in a direct current pump operating mode. The input signals refer to signal loops of a pressure switch, a position switch and the like of local equipment, which are conducted to the high-top PLC, and the output signals refer to normal monitoring signals, alarm signals and the like sent to a monitoring system by the high-top PLC.
5. Typical control logic design
(1) The monitoring system control logic (control system of local controller) is a monitoring control system for whole plant equipment such as a unit. The starting-up of the monitoring system is automatically controlled by a program.
And after the monitoring system sends a command of starting the high-pressure oil jacking oil pump during starting, waiting for the normal pressure of the high-pressure oil jacking device and the return of a signal for operating the oil pump.
And after the monitoring system sends a command of stopping and starting the high-pressure oil jacking oil pump in the stopping process, waiting for a signal of normal pressure of the high-pressure oil jacking device and returning an oil pump operation signal.
And the monitoring system waits for a signal of normal pressure of the high-pressure oil jacking device to return after sending a 'stop start high-pressure command' in the accident stop process.
(2) In-situ PLC control logic (control system of in-situ controller)
And when the remote high-pressure oil device is started, the high-pressure oil jacking device is put into operation, and the high-pressure oil jacking device stops operating after the rotating speed is more than 90%.
And when the remote high-pressure oil device is stopped and started, the high-pressure oil jacking device is put into operation, and the high-pressure oil jacking device stops operating after the rotating speed signal is less than 1%.
As shown in figure 1, the control method of the high-pressure oil jacking device of the pumped storage unit comprises the following steps of
The upper computer monitoring unit sends out a command for starting high-pressure oil to jack up the oil pump when being in a start-stop state;
after receiving an instruction for starting the high-pressure oil pump, a control module of the high-pressure oil jacking device starts a self-checking program, judges whether the liquid level of the oil collecting tank is normal or not after the self-checking is free from faults, and if so, starts an alternating current pump to operate; if not, alarming the oil level in a two-stage alarming mode;
if the liquid level of the oil collecting tank is normal, the oil pressure signal of the oil outlet pipeline of the alternating current pump is monitored in real time after the alternating current pump is started, when the oil pressure signal is lower than a set threshold value, the direct current pump is switched to work, the oil pressure signal of the oil outlet pipeline of the direct current pump is monitored, and when the oil pressure of the direct current pump is lower than the set threshold value, a machine unit stop signal is sent out, and an alarm is given.
And the running state of the unit is monitored in real time, and when the unit is in a creeping state, the control module controls the alternating current pump and the direct current pump of the high-pressure oil jacking device to be started automatically.
And after the alternating current pump or the direct current pump is started to work, the rotating speed of the unit is monitored in real time, and when the rotating speed is larger than the set first rotating speed or smaller than the set second rotating speed, the alternating current pump or the direct current pump is controlled to stop.
The high-pressure oil jack-up device should start the alternating current pump first, after the pump is started, if the conditions such as the pump pressure, the flow and the like are not satisfied (the flow monitored by the flow measuring element is judged by time delay and filtering and the pump pressure is not in accordance with the requirements), and the direct current pump is started if the pump is judged to be failed to start. After the direct current pump is started, if the conditions such as the pump pressure, the flow and the like are not satisfied (delay and filtering judgment), the failure of starting the pump is judged.
As shown in fig. 2 and 3, (1) control loop contact
The control loop should include the following contacts: the ball valve is not in the full closing position, the guide vane is not in the full closing position, the rotating speed is less than 1 percent, the rotating speed is more than 90 percent, the unit peristaltic motion is realized, the pump starting command is monitored, and the pump stopping command is monitored.
(2) Control loop function
When the position full-closing signals of the ball valve and the guide vane of the unit disappear or the unit peristaltic movement occurs, the high-pressure oil jacking device is automatically started.
And when the rotating speed of the unit is higher than 90%, the high-pressure oil jacking device automatically stops.
The high-pressure oil jacking device operates normally, and the direct-current pump is started automatically when the pressure is not satisfied.
The high-pressure oil jacking device receives a starting command sent by the monitoring system, and the oil pump contactor is controlled by the double-position relay to directly start the high-pressure oil jacking device. The control system loses power or has program failure, and the current state should be self-maintained.
K004 DC pump starting delay relay
K100 start-stop pump double-position relay
K8005 pump stop control relay
K101 start-stop DC pump double-position relay
K8008 stop DC pump control relay
Time-delay disconnection relay with rotation speed of K001 speed measuring device being more than 90 percent
Delay cut-off relay with K002 speed regulator rotating speed >90%
K003 AC pump starting delay relay
It is obvious that the specific implementation of the present invention is not limited by the above-mentioned modes, and that it is within the scope of protection of the present invention only to adopt various insubstantial modifications made by the method conception and technical scheme of the present invention.
Claims (1)
1. A control method of a control system of a high-pressure oil jacking device of a pumped storage unit is characterized by comprising the following steps of: the control system comprises a control module and an oil level monitoring element, the high-pressure oil jacking device comprises an alternating current pump and a direct current pump, the alternating current pump is a main pump, the direct current pump is a standby pump, the input end of the control module is connected with a unit state acquisition module, and the control module is used for controlling the operation of the alternating current pump or the direct current pump to jet high-pressure oil when the unit is in a start-stop state and a creeping state; the oil level monitoring element is arranged in the oil collecting tank, and the output end of the oil level monitoring element is connected with the control module; the control module is used for prohibiting the unit from starting to operate when the oil level is abnormal according to the oil level signal;
the output end of the control module is connected with a two-stage alarm system; the two-stage alarm system is used for sending out alarm signals and outputting tripping control signals to the unit at the same time so as to trip the unit;
the control module adopts a dual-power module and is used for controlling power supply of the control module;
the unit state acquisition module comprises a unit rotating speed acquisition module, the output end of the unit rotating speed acquisition module is connected with the control module, and the control module identifies the starting, stopping and creeping working states of the unit according to the unit rotating speed;
the starting control mode of the control module comprises two modes of remote automation and local manual operation;
an oil way pressure detection unit is arranged on an oil pump output port pipeline of an alternating current pump and a direct current pump of the high-pressure oil jack-up device, the output end of the oil way pressure detection unit is connected with a control module, and the control module is used for controlling the alternating current pump and the direct current pump to switch or send out an alarm signal or controlling the shutdown of a unit when an oil pressure signal is lower than a set lower limit value;
the alternating current pump or the direct current pump keeps running in an original state when the control module is powered off;
the control module is connected with the delay module or the timing module and is used for realizing timing or delay starting;
the control method comprises the following steps:
the upper computer monitoring unit sends out a command for starting high-pressure oil to jack up the oil pump when being in a start-stop state;
after receiving an instruction for starting the high-pressure oil pump, a control module of the high-pressure oil jacking device starts a self-checking program, judges whether the liquid level of the oil collecting tank is normal or not after the self-checking is fault-free, and starts an alternating current pump to operate if the liquid level of the oil collecting tank is normal; if not, alarming the oil level in a two-stage alarming mode;
if the liquid level of the oil collecting tank is normal, the oil pressure signal of an oil outlet pipeline of the alternating current pump is monitored in real time after the alternating current pump is started, when the oil pressure signal is lower than a set threshold value, the direct current pump is switched to work, the oil pressure signal of the oil outlet pipeline of the direct current pump is monitored, and when the oil pressure of the direct current pump is lower than the set threshold value, a machine unit stop signal is sent out, and an alarm is given;
the running state of the unit is monitored in real time, and when the unit is in a creeping state, the control module controls the alternating current pump and the direct current pump of the high-pressure oil jacking device to be started automatically;
when the alternating current pump or the direct current pump is started to work, the rotating speed of the unit is monitored in real time, and when the rotating speed is larger than the set first rotating speed or smaller than the set second rotating speed, the alternating current pump or the direct current pump is controlled to stop;
the high-pressure oil jacking device should start the alternating current pump firstly, after the alternating current pump is started, if the pump pressure and flow conditions are not satisfied: the delay and filtering are used for judging that the flow monitored by the flow measuring element and the pump pressure do not meet the requirements, and if the pump starting failure is judged, the direct-current pump is started; after the direct-current pump is started, if the pump pressure and flow conditions are not met, judging that the pump is failed to start;
the control system of the high-pressure oil jacking device is provided with an independent power switch, so that the loss of a control power supply caused by the faults of other auxiliary equipment is avoided; the control system power supply is separated from the oil pump power supply, when the control loop power supply disappears, the oil pump power supply can still normally supply power, and normal operation can be continued as long as the pump stopping loop is not conducted;
according to the condition of the host, the high-pressure oil jacking device should be capable of being stopped in a delayed mode or started in a timing mode; the aim of delay stopping is achieved: stopping the high-pressure oil jacking device when the rotating speed is more than 90%, and repeatedly starting and stopping the high-pressure oil jacking device in a short time to cause equipment damage if no time delay exists and the signal jitter of the rotating speed is more than 90% is unstable; the principle is that the pump stopping loop can be delayed to be conducted by utilizing the delay relay to set time;
control logic of the control system: in the starting process of the monitoring system, after a 'starting high-pressure oil jacking oil pump command' is sent, waiting for the normal pressure of the high-pressure oil jacking device and the return of a signal for operating the oil pump;
in the stopping process of the monitoring system, after a command of stopping and starting the high-pressure oil jacking oil pump is sent, waiting for a signal of normal pressure of the high-pressure oil jacking device and returning an oil pump operation signal;
in the accident shutdown process, the monitoring system waits for a signal of normal pressure of the high-pressure oil jacking device to return after sending a shutdown starting high-pressure command;
local PLC control logic:
when the remote high-pressure oil device is started, the high-pressure oil jacking device is put into operation, and the high-pressure oil jacking device stops operating after the rotating speed is more than 90%;
and when the remote high-pressure oil device is stopped and started, the high-pressure oil jacking device is put into operation, and the high-pressure oil jacking device stops operating after the rotating speed signal is less than 1%.
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