CN113669243A - 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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- CN113669243A CN113669243A CN202110954438.3A CN202110954438A CN113669243A CN 113669243 A CN113669243 A CN 113669243A CN 202110954438 A CN202110954438 A CN 202110954438A CN 113669243 A CN113669243 A CN 113669243A
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- 230000009193 crawling Effects 0.000 claims abstract description 8
- 230000002159 abnormal effect Effects 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims abstract description 3
- 239000007788 liquid Substances 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 167
- 230000003111 delayed effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000001914 filtration 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
- 230000014509 gene expression Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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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
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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
- 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
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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
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Computer Hardware Design (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a control system of a high-pressure oil jacking device of a pumped storage unit, which comprises: 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 used for controlling the operation of the alternating-current pump or the direct-current pump to spray high-pressure oil when the unit is in a starting-stopping state and a crawling 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 forbidding the unit to start and 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 realize starting and stopping more accurately and reliably, 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.
Description
Technical Field
The invention relates to the field of hydroelectric power generation, in particular to a control system and method for a high-pressure oil jacking device of a pumped storage unit.
Background
The hydro-generator thrust bearing is provided with the high-pressure oil jacking device, so that the device is of great significance. When the hydraulic generator normally operates, the thrust bearing has liquid friction. Under the same other conditions, the thickness of the wedge-shaped oil film between the bearing bush and the mirror plate is inversely proportional to the unit pressure. In a large hydroelectric generating set with large thrust load, a wedge-shaped oil film between the mirror plate and the bearing bush becomes thinner due to the increase of unit load. Particularly, in the starting and stopping processes, dry friction is more easily generated when the machine runs at a low rotating speed, so that the bearing bush is seriously abraded, and even a machine set cannot run. The unit pressure of the thrust bearing of some units is not high, but because the area of the thrust pad is large, the axial surface is easy to generate mechanical deformation, and an oil film between the pads is difficult to form. Operating under such conditions can also cause severe damage to the bearing shells. When the unit is used for peak regulation in a power grid, the rotating speed is too low under the condition of frequent start and stop, so that an oil film is difficult to form between 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 thrust bearing lubricating system of a hydraulic generator, is an important link in an auxiliary machine control system of a hydropower station, and has the function of spraying high-pressure oil on the surface of a thrust bearing when a unit is started and stopped so as to form an oil film on the surface of the thrust bearing, thereby avoiding abrasion of a thrust pad. In general, a high-pressure oil jacking device is put into use in the starting and stopping processes of a unit and in the creeping process of the unit. However, the input control method is too simple, the control on the high-pressure oil jacking system/device cannot be accurately and reliably realized, and if the high-pressure oil cannot be provided for the operation of the unit due to inaccurate control on the high-pressure oil jacking system, the operation safety accident of the pumped storage unit can be caused, so that a safe and reliable control system of the high-pressure oil jacking system of the pumped storage power station needs to be designed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control system and a control method of a high-pressure oil jacking device of a pumped storage unit, which are used for realizing the reliable and accurate starting, operation and closing of the high-pressure oil jacking system and ensuring the reliable operation of the high-pressure oil jacking system.
In order to achieve the purpose, the invention adopts the technical scheme that: a control system of a high-pressure oil jacking device of a pumped storage unit comprises a control module and an oil level monitoring element, wherein the high-pressure oil jacking device comprises an AC pump and a DC pump, the AC pump is a main pump, the DC 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 AC pump or the DC pump to spray high-pressure oil when the unit is in a starting and stopping state and a crawling 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 forbidding the unit to start and operate when the oil level is abnormal according to the oil level signal.
The output end of the control module is connected with the two-stage alarm system; the two-stage alarm system is used for sending an alarm signal and simultaneously outputting a tripping control signal to the unit so that the unit trips.
The control module adopts a dual-power module and is used for controlling power supply to the control module.
The unit state acquisition module comprises a unit rotating speed acquisition module, the output end of the unit state acquisition module is connected with the control module, and the control module identifies the starting, stopping and crawling working states of the unit according to the rotating speed of the unit.
The starting control mode of the control module comprises 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 oil way pressure detection units, the output ends of the oil way pressure detection units are 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/or send out alarm signals or control the unit to stop when the oil pressure signals are lower than a set lower limit value.
And the alternating current pump or the direct current pump keeps running in an original state when the control module loses power.
The control module is connected with the delay module or the timing module and is used for realizing timing or delay starting.
A control method of a high-pressure oil jacking device of a pumped storage unit comprises the steps of
The upper computer monitors the unit to send a command of starting the high-pressure oil jacking oil pump in a starting and stopping state;
after a control module of the high-pressure oil jacking device receives an instruction of starting a high-pressure oil jacking oil pump, starting a self-checking program, judging whether the liquid level of an oil collecting tank is normal or not after no fault exists in self-checking, and if so, starting an alternating-current pump to operate; if not, the oil level is alarmed 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 smaller than the set threshold value, a 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 crawling state, the control module controls the AC pump and the DC pump of the high-pressure oil jacking device to be started automatically.
And when the rotating speed is greater than a set first rotating speed or less than a 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 realize starting and stopping more accurately and reliably, 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 unit is automatically started under the creeping condition, so that the accurate oil protection of the unit during creeping is ensured; the system judges the oil liquid level and the oil pressure signal, can give an alarm and switch the main and standby oil pumps in time, and further ensures the reliable operation of the system.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a logic diagram of start-stop control of high-pressure oil jacking in the scheme
FIG. 2 is a control diagram for starting and stopping the high top oil pump according to the present invention;
FIG. 3 is a control diagram for starting and stopping the main and standby high-top oil jack-up pumps according to the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
This application high pressure oil jack-up control system should adopt redundant configuration, including power, PLC input/output module, the system possesses the automatic switch-over ability simultaneously. 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, wherein one alternating-current oil pump is a main pump, and the other direct-current oil pump is a standby pump. The starting modes of the high-pressure oil pump motor comprise direct starting, soft starting and frequency converter starting; the direct starting is to directly start the motor under the full voltage condition; the soft start is mainly to share partial voltage drop by serially connecting a variable resistor and the like in a loop, and the voltage drop on the variable resistor is reduced along with the lapse of the start time, so that the high-voltage motor is smoothly started; the frequency converter is started by converting the power frequency AC power into the DC power through the rectifier and then converting the DC power into the AC power with controllable frequency and voltage in a gradient way by using the pain-breaking action of the controllable silicon element, and supplying the AC power to the motor, thereby achieving 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 component 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 value is met or not is judged through setting a fixed value, and when the oil level value is not met, the unit is prohibited from being started to avoid burning the bearing bush. The high-pressure oil jacking control system is provided with an oil pressure monitoring element, and is provided with two-stage alarming, and the two-stage alarming is realized by adopting a pressure switch (namely the oil pressure monitoring element), and comprises an alarming pressure switch and a tripping pressure switch, wherein 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 the pressure reaches the first-stage alarming, the alarming pressure switch is conducted, the alarming loop is conducted, and the alarming loop sends out an alarming signal, for example, the alarming pressure switch can be connected in series in a power supply loop of the alarm to control the operation of the alarm; when the pressure reaches the secondary alarm, the tripping pressure switch is switched on, the tripping loop is switched on, and after the tripping loop is switched on for power supply, the tripping system is controlled to work. The first level is alarming, the second level is tripping, and when the oil pressure is not satisfied, the unit is forbidden to start to avoid burning the bearing bush. When the oil pump control system fails or the power supply disappears, the bearing oil pump should normally operate (when the control system power supply is separated from the oil pump power supply, the oil pump power supply can still normally supply power when the control loop power supply disappears, and the bearing oil pump can continue to normally operate as long as the pump stopping loop is not conducted). The oil pressure is not satisfied when the main oil pump operates, and the high-pressure oil jacking control system automatically controls the starting of the standby oil pump.
In order to guarantee the security start principle of high pressure oil jack-up system, this application adopts the scheme to include:
(1) when the rotating speed of the unit is lower than 90% of the rated rotating speed, the high-pressure oil jacking device is stopped completely.
(2) The oil pressure of the high-pressure oil jacking device does not meet the conditions, and the machine set is prevented from starting 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.
In order 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 can also be controlled by hard wiring.
(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 supplied with power in double paths. If a hard-wired mode is adopted, the control system also needs to supply power in two ways. The dual-power module is a dual-path power input, mutual redundancy and one-path power output. When the dual-power module judges that the output of the power supply in use has a fault through the node signal or the voltage signal, the dual-power module can be automatically switched to the other path for supplying power.
(3) The control mode of the high-pressure jacking device is remote automatic and local manual. The local manual control loop is preferably hard-wired.
(4) The unit has a creeping phenomenon, and the high-pressure oil jacking device is automatically started. The creep can be judged by acquiring the unit rotating speed signal, judging that the creep is judged under the condition that the speed is less than a certain speed and the rotating speed is kept low, or utilizing a device specially used for measuring the creep of the unit, wherein the judgment condition comprises but is not limited to the rotating speed signal.
(5) The high-pressure oil jacking device is provided with two oil pumps, an alternating-current oil pump and a direct-current oil pump. The DC pump is used as a backup of the AC pump. The oil pressure is not satisfied when the main oil pump operates, and the high-pressure oil jacking device should automatically control the starting of the standby oil pump.
(6) The pressure of an oil pump outlet of the high-pressure oil jacking device is provided with an analog measuring point, and the pressure is used as a necessary condition of a starting process. In the jacking operation process of the high-pressure oil of the thrust bearing of the unit, the lower limit-crossing signal is set at the pressure measuring point of the oil way to act on an alarm and act on the shutdown in a delayed manner. The fixed value is reasonably set according to a manufacturer design recommended value and the actual situation on site.
(7) The high-pressure oil jacking device is used for ensuring that the oil pump keeps running in the original state when the control system is powered off. The control system of the high-pressure oil jacking device is suitable to be provided with an independent power switch, so that the control power loss caused by other auxiliary equipment faults is avoided. The power supply of the control system is separated from the power supply of the oil pump, when the power supply of the control loop disappears, the power supply of the oil pump can still supply power normally, and the normal operation can be continued as long as the pump stopping loop is not conducted
(8) According to the situation of the main engine, the high-pressure oil jacking device can be stopped in a delayed mode or started in a timed mode. The purposes of delayed stop and timed start are realized: if the rotating speed is greater than 90%, the high-pressure oil jacking device is stopped, and if the signal jitter is unstable when the rotating speed is greater than 90%, the high-pressure oil jacking device is repeatedly started and stopped in a short time, so that equipment is damaged. The principle is that a time delay relay is used for setting time, and a pump stopping loop can be conducted in a delayed mode.
4. Input/output signal
(1) Inputting a signal:
the method comprises the following steps of starting a high-pressure oil jacking device when starting a machine, starting the high-pressure oil jacking device when stopping the machine, and starting the high-pressure oil jacking device when stopping the machine.
(2) Outputting a signal:
the method comprises the following steps that the pressure of a high-pressure oil jacking device is normal, the pressure of the high-pressure oil jacking device is low and trips, the AC pump voltage of the high-pressure oil jacking device disappears, the DC pump voltage of the high-pressure oil jacking device disappears, 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 stopping state, the high-pressure oil jacking device is in a driving fault, the high-pressure oil jacking device is in an AC pump operating mode, and the high-pressure oil jacking device is in a DC pump operating mode. The input signal refers to the signal circuit breakover of a pressure switch, a position switch and the like of the existing place equipment and is transmitted to the high-top PLC, and the output signal refers to some normal monitoring signals, alarm signals and the like transmitted to the monitoring system by the high-top PLC.
5. Exemplary control logic design
(1) Monitoring system control logic (control system of local controller) the monitoring system is a monitoring control system for plant equipment such as machine set. The monitoring system is automatically controlled by a program when being started.
And in the starting process, after a starting-up high-pressure oil jacking oil pump command is sent by the monitoring system, the signals of normal pressure of the high-pressure oil jacking device and running of the oil pump are waited to return.
And in the stopping process, after a command of stopping and starting the high-pressure oil jacking pump is sent by the monitoring system, a signal that the pressure of the high-pressure oil jacking device is normal and an oil pump operation signal are returned are waited.
And in the process of accident shutdown, after a shutdown starting high-top order is sent by the monitoring system, a signal that the pressure of the high-pressure oil jacking device is normal is waited to return.
(2) Local PLC control logic (control system with local controller)
And after receiving a starting-up starting command of the remote high-pressure oil device, 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 after a remote stop starting command of the high-pressure oil device is received, 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
The upper computer monitors the unit to send a command of starting the high-pressure oil jacking oil pump in a starting and stopping state;
after a control module of the high-pressure oil jacking device receives an instruction of starting a high-pressure oil jacking oil pump, starting a self-checking program, judging whether the liquid level of an oil collecting tank is normal or not after no fault exists in self-checking, and if so, starting an alternating-current pump to operate; if not, the oil level is alarmed 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 smaller than the set threshold value, a 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 crawling state, the control module controls the AC pump and the DC pump of the high-pressure oil jacking device to be started automatically.
And when the rotating speed is greater than a set first rotating speed or less than a set second rotating speed, the alternating-current pump or the direct-current pump is controlled to stop.
The high-pressure oil jacking device starts an alternating-current pump firstly, and after the pump is started, if the conditions such as pressure and flow of the pump are not met (the conditions such as time delay and filtering are used for judging the flow monitored by a flow measurement element and the pressure of the pump are not met), the pump is judged to be failed to start, and then the direct-current pump is started. After the direct-current pump is started, if the conditions such as pressure, flow and the like of the pump are not met (time 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-off position, the guide vane is not in the full-off position, the rotating speed is less than 1%, the rotating speed is greater than 90%, the unit wriggles, the pump starting order is monitored, and the pump stopping order is monitored.
(2) Control loop function
When the fully closed signals of the ball valve and the guide vane of the unit disappear or the unit creeps, the high-pressure oil jacking device is automatically started.
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 normally operates, and the straight-flow pump is automatically started when the pressure is not met.
The high-pressure oil jacking device receives a starting command sent by the monitoring system, and the high-pressure oil jacking device is directly started by controlling the oil pump contactor through the double-position relay. And when the control system loses power or fails in programs, the current state is kept.
K004 direct current pump starting time delay relay
K100 pump starting and stopping double-position relay
K8005 pump stop control relay
K101 start-stop DC pump double-position relay
K8008 stops direct current pump control relay
Delay disconnection relay for K001 speed measuring device with rotating speed more than 90%
Delay cut-off relay for K002 speed regulator rotating speed > 90%
K003 AC pump starting delay relay
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (10)
1. The utility model provides a control system of pumped storage unit high pressure oil jacking system which characterized in that: 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 used for controlling the operation of the alternating-current pump or the direct-current pump to spray high-pressure oil when the unit is in a starting-stopping state and a crawling 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 forbidding the unit to start and operate when the oil level is abnormal according to the oil level signal.
2. The control system of the high-pressure oil jacking device of the pumped-storage unit as claimed in claim 1, wherein: the output end of the control module is connected with the two-stage alarm system; the two-stage alarm system is used for sending an alarm signal and simultaneously outputting a tripping control signal to the unit so that the unit trips.
3. The control system of the high-pressure oil jacking device of the pumped-storage unit as claimed in claim 1 or 2, wherein: the control module adopts a dual-power module and is used for controlling power supply to the control module.
4. The control system of the high-pressure oil jacking device of the pumped-storage unit as claimed in claim 1 or 2, wherein: the unit state acquisition module comprises a unit rotating speed acquisition module, the output end of the unit state acquisition module is connected with the control module, and the control module identifies the starting, stopping and crawling working states of the unit according to the rotating speed of the unit.
5. The control system of the high-pressure oil jacking device of the pumped-storage unit as claimed in claim 1 or 2, wherein: the starting control mode of the control module comprises remote automatic mode and local manual mode.
6. The control system of the high-pressure oil jacking device of the pumped-storage unit as claimed in claim 1 or 2, wherein: 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 oil way pressure detection units, the output ends of the oil way pressure detection units are 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/or send out alarm signals or control the unit to stop when the oil pressure signals are lower than a set lower limit value.
7. The control system of the high-pressure oil jacking device of the pumped-storage unit as claimed in claim 1 or 2, wherein: and the alternating current pump or the direct current pump keeps running in an original state when the control module loses power.
8. The control system of the high-pressure oil jacking device of the pumped-storage unit as claimed in claim 1 or 2, wherein: the control module is connected with the delay module or the timing module and is used for realizing timing or delay starting.
9. The control method of the high-pressure oil jacking device of the pumped-storage group according to any one of claims 1 to 8, characterized in that:
the upper computer monitors the unit to send a command of starting the high-pressure oil jacking oil pump in a starting and stopping state;
after a control module of the high-pressure oil jacking device receives an instruction of starting a high-pressure oil jacking oil pump, starting a self-checking program, judging whether the liquid level of an oil collecting tank is normal or not after no fault exists in self-checking, and if so, starting an alternating-current pump to operate; if not, the oil level is alarmed 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 smaller than the set threshold value, a unit stop signal is sent out and an alarm is given.
10. The method for controlling the high-pressure oil jacking device of the pumped-storage group according to claim 9, wherein:
the running state of the unit is monitored in real time, and when the unit is in a crawling state, the control module controls the AC pump and the DC pump of the high-pressure oil jacking device to be started automatically.
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| CN117072368A (en) * | 2023-09-15 | 2023-11-17 | 南方电网调峰调频发电有限公司储能科研院 | Control method and device for thrust high-pressure oil jacking system of hydroelectric generating set |
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