CN215762597U - Control device for speed regulator hydraulic system of giant hydroelectric generating set - Google Patents
Control device for speed regulator hydraulic system of giant hydroelectric generating set Download PDFInfo
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- CN215762597U CN215762597U CN202121299317.1U CN202121299317U CN215762597U CN 215762597 U CN215762597 U CN 215762597U CN 202121299317 U CN202121299317 U CN 202121299317U CN 215762597 U CN215762597 U CN 215762597U
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Abstract
A control device of a speed regulator hydraulic system of a giant hydroelectric generating set comprises an isolation valve, a main pressure supply oil source valve, an accident pressure distribution valve, a servomotor, a main pressure distribution valve and a main pressure distribution valve oil source valve which are sequentially and circularly connected through an oil supply pipeline, wherein a pressure oil tank is arranged on a pipeline between the main pressure supply oil source valve and the accident pressure distribution valve oil source valve. The pressure value of the hydraulic system is comprehensively judged through the pipeline pressure sensor and the oil tank pressure sensor, the pressure required by the normal operation of the hydraulic system can be directly judged, the isolation valve and the oil pump driving motor are controlled, the working condition flow of the hydraulic system is smoothly executed, closed-loop control is realized by the pressure sensor and the liquid level meter, the operation working condition of the hydraulic system is divided into a starting state, an operation state, a stopping state and a standby state, the preset flow under each working condition is executed, the working condition of the hydraulic system is adjusted and converted in real time, and the actual requirement of the unit operation is met.
Description
Technical Field
The utility model relates to the field of water turbine control, in particular to a control device for a speed regulator hydraulic system of a giant water turbine generator set.
Background
The hydraulic system is used as one of important parts for controlling the hydro turbine governor and is also one of important systems for controlling the hydro-turbo generator set. The normal starting and stopping of the hydraulic system directly influences the success rate of the starting and stopping of the unit. The hydraulic system mainly has the functions of outputting oil pressure to supplement consumed oil for the unit regulation and maintaining the oil pressure of the whole system, and ensuring the oil pressure required by the unit in normal operation.
At present, equipment intellectualization and system automation control are realized in the aspect of speed regulator hydraulic system control, but the hydraulic system belongs to a follow-up system, and accurate control logic and clear working condition conversion are ensured when a remote automatic control command is received, otherwise, equipment maintenance and management cost is improved, and labor cost is increased. Meanwhile, the equipment is in a chaotic state during fault treatment and maintenance, so that the fault cannot be positioned in time and the fault reason cannot be accurately judged, the fault is based on the field experience of maintenance personnel, dynamic judgment and real-time control are not performed, and the equipment treatment efficiency is reduced.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide a control device for a hydraulic system of a speed regulator of a huge hydroelectric generating set, which ensures that the regulation and control of the speed regulator of a hydropower station are stable, ensures that the active power monitoring of the hydroelectric generating set is accurate and reliable, improves the logic judgment reliability, reduces the loss caused by accidents to the maximum extent, and protects the personal safety and the asset safety.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
a control device of a speed regulator hydraulic system of a giant hydroelectric generating set comprises an isolation valve, a main pressure supply oil source valve, an accident pressure distribution valve, a servomotor, a main pressure distribution valve and a main pressure distribution valve oil source valve which are sequentially and circularly connected through an oil supply pipeline, wherein a pressure oil tank is arranged on a pipeline between the main pressure supply oil source valve and the accident pressure distribution valve oil source valve, an oil pump motor set and a pipeline pressure sensor are arranged on a pipeline between the isolation valve and the main pressure distribution valve oil source valve, the oil pump motor set is connected with an oil return tank, the oil return tank is connected with the pressure oil tank, and the isolation valve, the main pressure supply oil source valve, the accident pressure distribution valve, the servomotor, the main pressure distribution valve and the main pressure distribution valve oil source valve, and the motor and the sensor are electrically connected with a PLC control cabinet.
Be equipped with oil tank level gauge and oil tank pressure sensor on foretell pressure oil tank, oil tank level gauge and oil tank pressure sensor are connected with the PLC switch board electricity, and oil tank pressure sensor is used for monitoring pressure oil tank's pressure, as the judgement condition of hydraulic system control oil pump, and the oil tank level gauge is used for monitoring pressure oil tank's liquid level, as one of the judgement condition that hydraulic system started.
And an oil return tank liquid level meter is arranged on the oil return tank, an oil discharge valve is arranged on a pipeline between the oil return tank and the pressure oil tank, and the oil return tank liquid level meter and the oil discharge valve are electrically connected with the PLC control cabinet.
The isolation valve, the main pressure supply oil source valve, the accident pressure distribution valve oil source valve and the accident pressure distribution valve are all provided with position switches so as to feed back the opening and closing states of the position switches, and the opening and closing states serve as one of judgment conditions for starting the hydraulic system.
The oil outlet of the pressure oil tank is output in two paths, one path of the oil outlet sequentially passes through the accident pressure distributing valve oil source valve and the accident pressure distributing valve, the output pressure is connected by a pipeline and enters the servomotor, the servomotor can be controlled to close the guide vane rapidly under the accident condition, and the other path of the oil outlet of the pressure oil tank sequentially passes through the main pressure supply oil source valve, the isolation valve, the main pressure distributing valve oil source valve and the main pressure distributing valve and is connected by a pipeline to output pressure oil to enter the servomotor, so that the guide vane of the speed regulator can be opened and closed normally.
The PLC control cabinet is used for monitoring the running state and the fault state of system equipment, receiving starting and stopping commands of a remote control hydraulic system and executing a flow according to preset logic.
The control modes of the hydraulic system include a manual control mode and an automatic control mode, and the modes of the PLC control cabinet for receiving control commands include the following two modes:
the first mode is as follows: and in the local manual control mode, system equipment is sequentially operated according to the starting process sequence of the hydraulic system through a local manual control button and an equipment manual valve of the PLC control cabinet, so that the hydraulic system is in normal operation, and the operation condition of the hydraulic system is converted. The method is mainly used for installation, debugging, overhauling and starting of the unit.
The second mode is as follows: the local automatic control mode can realize the function of manually starting and stopping the hydraulic system in the local through a local HMI starting and stopping button of the PLC control cabinet, and can execute and convert the operation condition of the hydraulic system according to a control flow preset by the PLC, and the mode is commonly used for unit maintenance and field debugging.
The third mode is as follows: and in a remote automatic control mode, the PLC control cabinet receives remote starting and stopping commands of the monitoring system, so that the function of starting and controlling the hydraulic system can be realized. This approach is typically used for normal operation of the hydraulic system.
The operation working conditions of the hydraulic system are mainly divided into a starting state, an operation state, a stop state and a standby state of the hydraulic system, and the specific control method comprises the following steps:
starting a dynamic state: according to the data signals collected by the PLC control cabinet, the liquid level of the oil return tank, the liquid level of the pressure oil tank and the oil pressure are checked, the running state of the equipment is checked, whether the hydraulic system has starting conditions or not is judged, the hydraulic system is switched into a starting state after a starting control command issued by the PLC, under the working condition, the isolation valve and the oil pump are started, whether the oil pump and the isolation valve are started successfully or not is monitored, and faults are judged.
The operation state is as follows: when the oil pressure of the hydraulic system reaches the operating state pressure set value and the isolation valve is in a fully-opened state, the working condition of the hydraulic system is converted from a starting state to an operating state, and under the working condition, the PLC executes an oil pump alternation mechanism to furthest prolong the service life of the oil pump and fully improve the utilization rate of the oil pump; the PLC dynamically and automatically controls the oil pump in real time according to the oil pressure value of the system so as to maintain the oil pressure of the hydraulic system at a normal pressure value; and the PLC judges the running state of the system equipment in real time according to the running state of the system and gives an alarm in time.
A stop state: when the hydraulic system PLC receives a hydraulic system stop command or when the hydraulic system has serious faults and meets the condition that the hydraulic system stops, the working condition of the hydraulic system is switched to a stop state, and under the working condition, the PLC control system automatically closes the isolation valve and the oil pump and judges the running states of the isolation valve and the oil pump.
Standby state: and judging whether the hydraulic system has a standby state condition or not according to the system operation characteristics and the equipment operation state.
According to the control device for the hydraulic system of the speed regulator of the giant hydroelectric generating set, provided by the utility model, the pressure value of the hydraulic system is comprehensively judged through the pipeline pressure sensor and the oil tank pressure sensor, the pressure required by the normal operation of the hydraulic system can be directly judged, and the working condition flow of the hydraulic system is smoothly executed by controlling the isolation valve and the oil pump driving motor, so that the normal operation of the hydraulic system is ensured, and the oil pressure required by the regulation of the system unit is maintained. The closed-loop control is realized by utilizing the pressure sensor and the liquid level meter, the operation working conditions of the hydraulic system are divided into a starting state, an operation state, a stopping state and a standby state, the preset flow under each working condition is executed, and the real-time adjustment and the working conditions of the hydraulic system are adjusted and converted so as to meet the actual requirements of the unit operation.
Drawings
The utility model is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic diagram of hydraulic system control logic.
In the figure: the system comprises an oil return tank 1, an oil pump motor set 2, an isolation valve 3, a main pressure supply oil source valve 4, a pressure oil tank 5, an accident pressure distribution valve oil source valve 6, an accident pressure distribution valve 7, a main pressure distribution valve oil source valve 8, a main pressure distribution valve 9, a servomotor 10, a PLC control cabinet 11, an oil discharge valve 12, a pipeline pressure sensor 13, an oil return tank liquid level meter 14, an oil tank liquid level meter 15, an oil tank pressure sensor 16 and a water guide mechanism 17.
Detailed Description
As shown in fig. 1, a control device of a giant hydroelectric generating set speed regulator hydraulic system comprises an isolation valve 3, a main pressure supply oil source valve 4, an accident pressure distribution valve oil source valve 6, an accident pressure distribution valve 7, a servomotor 10, a main pressure distribution valve 9 and a main pressure distribution valve oil source valve 8 which are sequentially and circularly connected through an oil supply pipeline, a pressure oil tank 5 is arranged on a pipeline between the main pressure supply oil source valve 4 and the accident pressure distribution valve oil source valve 6, an oil pump motor set 2 and a pipeline pressure sensor 13 are arranged on a pipeline between the isolation valve 3 and the main pressure distribution valve oil source valve 8, the oil pump motor set 2 is connected with an oil return tank 1, the oil return tank 1 is connected with the pressure oil tank 5, the isolation valve 3, the main pressure supply oil source valve 4, the accident pressure distribution valve oil source valve 6, the accident pressure distribution valve 7, the servomotor 10, the main pressure distribution valve 9, the main pressure distribution valve oil source valve 8, and the motor and the sensor are electrically connected with the PLC control cabinet 11.
The pressure oil tank 5 is provided with an oil tank liquid level meter 15 and an oil tank pressure sensor 16, the oil tank liquid level meter 15 and the oil tank pressure sensor 16 are electrically connected with the PLC control cabinet 11, the oil tank pressure sensor 16 is used for monitoring the pressure of the pressure oil tank and is used as a judgment condition for controlling the oil pump by the hydraulic system, and the oil tank liquid level meter 15 is used for monitoring the liquid level of the pressure oil tank and is used as one of judgment conditions for starting the hydraulic system.
An oil return tank liquid level meter 14 is arranged on the oil return tank 1, an oil discharge valve 12 is arranged on a pipeline between the oil return tank 1 and the pressure oil tank 5, and the oil return tank liquid level meter 14 and the oil discharge valve 12 are electrically connected with a PLC (programmable logic controller) control cabinet 11.
The isolation valve 3, the main pressure supply oil source valve 4, the accident pressure distribution valve oil source valve 6 and the accident pressure distribution valve 7 are all provided with position switches so as to feed back the opening and closing states of the position switches, and the opening and closing states are used as one of judgment conditions for starting the hydraulic system.
The oil outlet of the pressure oil tank 5 is output in two paths, one path of the oil outlet passes through an accident pressure distributing valve oil source valve 6 and an accident pressure distributing valve 7 in sequence, the output pressure is connected by a pipeline and enters a servomotor 10, and then the servomotor 10 can be rapidly controlled to close a guide vane under the accident condition, and the other path of the oil outlet passes through a main pressure supply oil source valve 4, an isolation valve 3, a main pressure distributing valve oil source valve 8 and a main pressure distributing valve 9 in sequence and is connected by a pipeline and outputs pressure oil to enter the servomotor, so that the guide vane of a speed regulator can be normally opened and closed.
The PLC control cabinet 11 is used for monitoring the running state and the fault state of system equipment, receiving starting and stopping commands of a remote control hydraulic system and executing a flow according to preset logic.
As shown in fig. 2, the specific automatic control and working condition processing method of the PLC remote automatic control is as follows:
the first step is as follows: the starting condition of the hydraulic system is judged, the system information is monitored in real time according to the PLC, the remote state of the hydraulic system is checked, the hydraulic system is checked to have no fault, the main pressure supply oil source valve is fully opened OK, the accident pressure distribution valve oil source valve is fully opened OK, the main pressure distribution valve oil source valve is fully opened OK, the isolation valve is fully opened OK, the oil return tank has too low liquid level and does not act OK, the pressure oil tank has too low pressure and does not act OK, and the large pump group ready OK meets the starting condition of the hydraulic system. When the hydraulic system starting condition meets the requirement, whether the hydraulic system receives a hydraulic system starting command is further checked.
The second step is that: and executing a starting state flow, when a hydraulic system starting command is received, switching the working condition of the hydraulic system from a standby state to a starting state, starting the oil pump and opening the isolation valve under the working condition to enable the isolation valve to be in a full-open state, carrying out fault judgment in the starting process, checking the opening failure of the isolation valve and the starting failure of the oil pump, and if any fault is monitored, automatically issuing a stopping command by the PLC control cabinet and switching the working condition of the hydraulic system from the starting state to the stopping state.
The third step: judging the operating state condition of the hydraulic system, checking whether the isolating valve is in a fully open state in the process of the previous step, checking whether the oil pressure value of the system meets the set normal operating pressure value of the hydraulic system, and enabling the working condition of the hydraulic system to enter the operating state from a starting state when the conditions meet the requirements at the same time.
The fourth step: and executing an operation state flow, wherein the system executes an oil pump automatic alternation mechanism and an oil pump automatic control flow under the working condition, the automatic alternation mechanism improves the service life of the oil pump and improves the utilization rate of the oil pump to the maximum extent, and the oil pump automatic control ensures that the oil pressure of the hydraulic system is maintained in a normal operation pressure range.
The fifth step: and judging the hydraulic system stop condition. And checking whether the hydraulic system receives a stop command, and if the PLC control cabinet receives the stop command, switching the working condition of the hydraulic system from the running state to the stop state.
And a sixth step: and executing a stop state flow, wherein the hydraulic system automatically closes the isolation valve and stops the oil pump under the working condition, and whether the hydraulic system is stopped successfully is judged.
The seventh step: and judging the standby state condition, and in the process of executing the stop state, checking whether the isolation valve is in a fully closed state or judging whether the stop state operation is overtime.
Eighth step: and executing a standby state flow, wherein if the standby state conditions meet any conditions, the working condition of the hydraulic system automatically changes from a stop state to a standby state, the hydraulic system keeps the isolation valve in a closed state under the working condition, the system automatically disconnects the oil pump and the motor control loop to stop the oil pump and the motor, after the execution of the step is finished, the control and processing mode of the whole hydraulic system is in a waiting state, when the conditions meet the conditions, the first step is automatically started, the control flow is executed repeatedly and repeatedly, and the control flow is dynamically controlled in real time, so that the control flow of the hydraulic system is normally executed.
Claims (3)
1. The utility model provides a huge hydroelectric set speed regulator hydraulic system controlling means which characterized in that: the oil pump system comprises an isolation valve (3), a main pressure supply oil source valve (4), an accident pressure distribution valve oil source valve (6), an accident pressure distribution valve (7), a servomotor (10), a main pressure distribution valve (9) and a main pressure distribution valve oil source valve (8) which are sequentially and circularly connected through an oil supply pipeline, wherein a pressure oil tank (5) is arranged on a pipeline between the main pressure supply oil source valve (4) and the accident pressure distribution valve oil source valve (6), an oil pump motor set (2) and a pipeline pressure sensor (13) are arranged on a pipeline between the isolation valve (3) and the main pressure distribution valve oil source valve (8), the oil pump motor set (2) is connected with an oil return tank (1), the oil return tank (1) is connected with the pressure oil tank (5), the isolation valve (3), the main pressure supply oil source valve (4), the accident pressure distribution valve oil source valve (6), the accident pressure distribution valve (7), the servomotor (10), the main pressure distribution valve (9) and the main pressure distribution valve oil source valve (8), The motor and the sensor are electrically connected with the PLC control cabinet (11).
2. The control device of the giant hydroelectric generating set speed regulator hydraulic system according to claim 1, wherein the pressure oil tank (5) is provided with an oil tank level meter (15) and an oil tank pressure sensor (16), and the oil tank level meter (15) and the oil tank pressure sensor (16) are electrically connected with the PLC control cabinet (11).
3. The control device of the giant hydroelectric generating set speed regulator hydraulic system according to claim 2, wherein the oil return tank (1) is provided with an oil return tank liquid level meter (14), an oil discharge valve (12) is arranged on a pipeline between the oil return tank (1) and the pressure oil tank (5), and the oil return tank liquid level meter (14) and the oil discharge valve (12) are electrically connected with the PLC control cabinet (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121299317.1U CN215762597U (en) | 2021-06-10 | 2021-06-10 | Control device for speed regulator hydraulic system of giant hydroelectric generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121299317.1U CN215762597U (en) | 2021-06-10 | 2021-06-10 | Control device for speed regulator hydraulic system of giant hydroelectric generating set |
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| Publication Number | Publication Date |
|---|---|
| CN215762597U true CN215762597U (en) | 2022-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121299317.1U Active CN215762597U (en) | 2021-06-10 | 2021-06-10 | Control device for speed regulator hydraulic system of giant hydroelectric generating set |
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| CN (1) | CN215762597U (en) |
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2021
- 2021-06-10 CN CN202121299317.1U patent/CN215762597U/en active Active
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