A pumped storage unit water pressure exhaust control device

Abstract

The present invention discloses a pumped storage unit water pressure and exhaust control device, which relates to the technical field of pumped storage units. When in manual control, the electromagnetic reversing valve and the push button switch are switched on and off by a conversion switch, and the push button switch is controlled to control the electromagnetic reversing valve to be energized and de-energized. When in automatic control, the electrical control part and the electromagnetic reversing valve are switched on and off by a conversion switch, and the PLC controller in the electrical control part controls the electromagnetic reversing valve to be energized and de-energized according to the set process. When the PLC controller fails, the monitoring system controls the access to the auxiliary contacts to control the electromagnetic reversing valve to be energized and de-energized. The present invention has manual control, automatic control and remote control. The remote control realizes the control part of the existing technical solution. The manual control can realize the valve action test requirements during the equipment debugging process. The automatic control also relatively independently assumes the control task when executing the water pressure and exhaust process. At the same time, there is a remote control as a backup, which enhances the redundancy of the control part.

Description

Technical Field

[0001] The present invention relates to the technical field of pumped storage units, and in particular to a pumped storage unit water pressure and exhaust control device. Background Art

[0002] During transitions between different operating conditions, pumped-storage units must execute the "inflating and water-pressing process," the "exhaust and water return process during operating-condition transition," and the "exhaust and water return process during shutdown." Executing these three processes requires controlling the opening and closing of multiple hydraulic valves with different positions and functions to inject air into the runner chamber or exhaust and water return, thereby controlling the phase-adjusted water level. The opening and closing of each hydraulic valve is achieved by controlling its corresponding dual-coil solenoid directional valve.

[0003] The existing technical solution involves installing a solenoid-operated directional control valve near an automated (i.e., within the power plant) hydraulic valve to control its opening and closing. The corresponding coil controlling the solenoid-operated directional control valve is remotely operated by the power plant monitoring system. The hydraulic valve position signal is transmitted to the power plant monitoring system via a hard contact, providing the feedback signal required for control processes.

[0004] However, the above solution has the following problems:

[0005] 1. The device is controlled remotely by the system and is easily affected by other systems working at the same time. When faced with specific problem situations, remote control alone can easily lead to poor efficiency or poor solution results.

[0006] 2. The control method is single, the control part lacks a backup control plan, and the control part has low redundancy, which also affects the safety of the factory.

[0007] 3. The signal transmission control and pipeline parts are separated, and it is impossible to collect and send the hydraulic valve position signal while operating the hydraulic valve to perform the specified action. Summary of the Invention

[0008] The purpose of the present invention is to solve the problems that the existing pumped storage units can only be remotely operated by the power station monitoring system during the execution of the "inflating and water pressure process", "working condition conversion exhaust and return water process" and "shutdown exhaust and return water process", and have no redundant control capabilities; the electromagnetic reversing valves that control the hydraulic valves are scattered in the power station plant, which is not convenient for centralized maintenance; the hydraulic valve position signals are only transmitted to the power station monitoring system through hard contacts and cannot be transmitted by communication. A pumped storage unit water pressure and exhaust control device is provided.

[0009] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0010] and a tube connecting the discharging opening of the pump with the help of the pump, and a tube connecting the discharging opening of the pump with the help of the pump, so that the oil circuit breaker has the said at least one hydraulic fob and the said control unit can connect the pump to the oil circuit breaker and the said control unit.

[0011] The electrical control part includes a PLC controller, a relay, a push button switch and a transfer switch. The PLC controller is connected in series with the relay, then in parallel with the push button switch, and then in series with the transfer switch. The push button switch is electrically connected to the electromagnetic reversing valve, and the relay auxiliary contact is electrically connected to the electromagnetic reversing valve.

[0012] In automatic control mode, the manual control switch is switched to the electrical control part to energize the PLC controller in the electrical control part, which controls the auxiliary contacts of the relay to energize and deenergize the solenoid reversing valve coil. When the solenoid reversing valve coil is energized, the solenoid reversing valve receives the control signal from the PLC controller to control the corresponding hydraulic valve to open or close. When the solenoid reversing valve coil is deenergized, the valve position remains unchanged, and the corresponding hydraulic valve maintains the current state.

[0013] In manual control mode, the manual control conversion switch is switched to the control button switch to energize, and the manual control button switch controls the power on and off of the solenoid reversing valve coil; when the solenoid reversing valve coil is energized, the solenoid reversing valve receives the button switch control signal to control the corresponding hydraulic valve to open or close; when the solenoid reversing valve coil is de-energized, the valve position remains unchanged, and the corresponding hydraulic valve maintains the current state;

[0014] When the PLC controller fails, it automatically switches to remote control mode, and the monitoring system controls the auxiliary contacts of the access relay to control the power on and off of the solenoid reversing valve coil; when the solenoid reversing valve coil is energized, the solenoid reversing valve receives the control signal of the monitoring system to control the corresponding hydraulic valve to open or close; when the solenoid reversing valve coil is de-energized, the valve position remains unchanged, and the corresponding hydraulic valve maintains the current state.

[0015] When in either manual control or remote control mode, the other two control modes are in cold standby state; when in automatic control, the remote control mode is in hot standby state.

[0016] Each oil pipe of the working oil pipe valve part is provided with a manual valve.

[0017] The electromagnetic reversing valve is relatively independent of the control signal of the hydraulic valve.

[0018] The electrical control part further includes: a wiring terminal; the wiring terminal is connected in parallel with the PLC controller and then in series with the power supply circuit.

[0019] The wiring terminals transmit the hydraulic valve fully closed and fully open position feedback signals to the monitoring system.

[0020] The power supply circuit includes: a switching power supply and a miniature circuit breaker, wherein the switching power supply and the miniature circuit breaker are connected in series.

[0021] The electrical control part and the working oil pipe valve part are placed in a standard cabinet, with the electrical control part at the upper part and the working oil pipe valve part at the lower part.

[0022] The standard cabinet is a standard cabinet body with dimensions of 800 mm in width, 800 mm in depth and 2200 mm in height.

[0023] The standard cabinet is provided with an indicator light, a conversion switch and a button switch.

[0024] The advantages of adopting the present invention are:

[0025] 1. Compared with the existing technology, the present invention is an electromechanical combined cabinet that integrates the functions of process control, signal transmission and mechanism execution in order to meet the requirements of water pressure and exhaust control. It can not only output control signals according to process requirements, but also operate the hydraulic valve to perform specified actions, and can also collect and send hydraulic valve position signals, thus completing the specific functions of the water pressure and exhaust control process relatively independently, eliminating the influence of other systems.

[0026] 2. Compared with the existing technology, this solution has manual control, automatic control and remote control. Not only does the remote control realize the control function of the existing technical solution, but the manual control can also realize the valve action test requirements during the equipment debugging process. The automatic control also independently assumes the control task when executing the water pressure and exhaust process. At the same time, there is remote control as a backup, which enhances the redundancy of the control function.

[0027] 3. The present invention centralizes the distributed installed electromagnetic reversing valves, simplifies the layout of the operating oil pipelines in the factory, reduces costs and makes operation and maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a front view of the pressurized water exhaust control device;

[0029] Figure 2 This is the rear view of the pressurized water exhaust control device;

[0030] Figure 3 This is a view of the cabinet door of the pressurized water exhaust control device;

[0031] Figure 4 This is a side view of the working oil pipe valve portion of the pressurized water exhaust control device;

[0032] Figure 5 This is a perspective view of the oil distribution valve block of the pressurized water exhaust control device;

[0033] Figure 6 This is a schematic diagram of the hydraulic valve of the pressurized water exhaust control device.

[0034] Figure numerals: 1. Oil inlet pipe, 2. Oil return pipe, 3. First working oil pipe, 4. Second working oil pipe, 5. Oil distribution valve block, 6. Solenoid reversing valve, 7. Hydraulic valve, 8. Oil inlet tank, 9. Oil outlet tank, 10. First working oil port, 11. Second working oil port, 12. PLC controller, 13. Relay, 14. Transfer switch, 15. Push button switch, 16. Manual valve, 17. Wiring terminal, 18. Switching power supply, 19. Miniature circuit breaker, 20. Standard cabinet, 21. Indicator light. DETAILED DESCRIPTION

[0035] Example 1

[0036] This embodiment further illustrates the structure and principle of the present invention with reference to the accompanying drawings:

[0037] A pumped storage unit water pressure exhaust control device, including an electrical control part, a working oil pipe valve part, an oil inlet pipe 1, an oil return pipe 2 and an oil distribution valve block 5, the working oil pipe valve part is at least six sets; the working oil pipe valve part includes a first working oil pipe 3, a second working oil pipe 4, an electromagnetic reversing valve 6 and a hydraulic valve 7, one electromagnetic reversing valve 6 controls one hydraulic valve 7; the oil distribution valve block 5 is provided with an oil inlet tank 8 and an oil return tank 9; the electromagnetic reversing valve 6 is provided on the oil distribution valve block 5 and respectively It is connected to the oil inlet tank 8 and the oil outlet tank 9; one end of the oil inlet pipe 1 is connected to the pressure oil tank, and the other end is connected to the oil inlet tank 8 of the oil distribution valve block 5; one end of the return oil pipe 2 is connected to the oil outlet tank 9 on the oil distribution valve block 5, and the other end of the return oil pipe 2 is connected to the return oil tank; one end of the first working oil pipe 3 is connected to the first working oil port 10 on the oil distribution valve block 5, and the other end is connected to the hydraulic valve opening control chamber; one end of the second working oil pipe 4 is connected to the second working oil port 11 on the oil distribution valve block 5, and the other end is connected to the hydraulic valve closing control chamber;

[0038] The electrical control part includes a PLC controller 12, a relay 13, a push button switch 15 and a transfer switch 14. The PLC controller 12 is connected in series with the relay 13, and then connected in parallel with the push button switch 15, and then connected in series with the transfer switch 14. The push button switch 15 is electrically connected to the electromagnetic reversing valve 6, and the auxiliary contact of the relay 13 is electrically connected to the electromagnetic reversing valve 6.

[0039] In the automatic control mode, the manual control switch 14 is switched to the electrical control part to energize the electrical control part, and the PLC controller 12 in the electrical control part controls the auxiliary contacts of the relay 13 to control the energization and de-energization of the solenoid reversing valve 6 coil; when the solenoid reversing valve 6 coil is energized, the solenoid reversing valve 6 receives the control signal of the PLC controller 12 to control the corresponding hydraulic valve 7 to open or close; when the solenoid reversing valve 6 coil is de-energized, the valve position remains unchanged, and the corresponding hydraulic valve 7 maintains the current state;

[0040] In manual control mode, the manual control conversion switch 14 is switched to the control button switch 15 to energize, and the manual control button switch 15 controls the energization and de-energization of the solenoid reversing valve 6 coil; when the solenoid reversing valve 6 coil is energized, the solenoid reversing valve 6 receives the control signal of the button switch 15 to control the corresponding hydraulic valve 7 to open or close; when the solenoid reversing valve 6 coil is de-energized, the valve position remains unchanged, and the corresponding hydraulic valve 7 maintains the current state;

[0041] When the PLC controller fails, it automatically switches to remote control mode, and the monitoring system controls the auxiliary contacts of the access relay 13 to control the power on and off of the solenoid reversing valve 6 coil; when the solenoid reversing valve 6 coil is energized, the solenoid reversing valve 6 receives the control signal of the monitoring system to control the corresponding hydraulic valve 7 to open or close; when the solenoid reversing valve 6 coil is de-energized, the valve position remains unchanged, and the corresponding hydraulic valve 7 maintains the current state.

[0042] When in either manual control or remote control mode, the other two control modes are in cold standby state; when in automatic control, the remote control mode is in hot standby state.

[0043] A manual valve 16 is provided on each oil pipe of the working oil pipe valve portion.

[0044] The electromagnetic reversing valve 6 is relatively independent of the hydraulic valve control signal.

[0045] The electrical control part further includes: a wiring terminal 17; the wiring terminal 17 is connected in parallel with the PLC controller 12 and then in series with the power supply circuit.

[0046] The connection terminal 17 transmits the fully closed and fully open position feedback signals of the hydraulic valve 7 to the monitoring system.

[0047] The power supply circuit includes a switching power supply 18 and a miniature circuit breaker 19 , wherein the switching power supply 18 and the miniature circuit breaker 19 are connected in series.

[0048] The electrical control part and the working oil pipe valve part are placed in a standard cabinet 20, with the electrical control part at the upper part and the working oil pipe valve part at the lower part.

[0049] The standard cabinet 20 is a standard cabinet body with dimensions of 800 mm in width, 800 mm in depth, and 2200 mm in height.

[0050] The standard cabinet 20 is provided with an indicator light 21 , a transfer switch 14 and a button switch 15 .

[0051] Example 2

[0052] like Figure 1-4 As shown, the pumped storage unit water pressure and exhaust control device of the present invention adopts an electromechanical cabinet, that is, the electrical control part and the working oil pipe valve part are placed in a standard cabinet 20.

[0053] A standard cabinet 20 of 800mm×800mm×2200mm (width×depth×height) is used as the carrier. The upper half of the cabinet is the electrical control part, and the lower half is the working oil pipe valve part. The electrical control part mainly includes low-voltage electrical components such as the PLC controller 12, relay 13, terminal block 17, and series-connected miniature circuit breaker 19 and switching power supply 18; the working oil pipe valve part mainly includes devices such as the electromagnetic reversing valve 6, hydraulic valve 7, oil distribution valve block 5 and manual valve 16.

[0054] An indicator light 21 is located on the cabinet door panel. When the hydraulic valve 7 is fully open or fully closed, the corresponding indicator light illuminates, indicating the position of the hydraulic valve 7. The hydraulic valve 7 is located within the pressurized water and exhaust work area. The upper half of the cabinet houses low-voltage electrical components, forming a control circuit. The PLC controller 12 controls the operation of the coils of the various solenoid reversing valves 6. The lower half of the cabinet houses the oil distribution valve block 5. The oil distribution valve block 5, the solenoid reversing valve 6, and the hydraulic valve 7 form the solenoid reversing valve circuit. All solenoid reversing valve circuits share a common oil inlet pipe 1 and oil return pipe 2. Their respective first and second working oil ports 10 and 11 are connected to the hydraulic valve control chamber within the plant via pipes. Each hydraulic valve 7 independently controls a separate circuit based on the signal from its own solenoid reversing valve 6. This complete circuit runs from pressure oil tank to oil inlet, solenoid reversing valve, hydraulic valve, solenoid reversing valve, oil return port, and oil return tank. The solenoid reversing valve 6 can only control the hydraulic valve 7 in the corresponding circuit.

[0055] The pressurized water exhaust control cabinet can realize manual control of the opening and closing of the corresponding hydraulic valve 7 of each electromagnetic reversing valve 6 through the button switch 15. This function can be used for the debugging work of the hydraulic valve 7 and the control mechanism.

[0056] During automatic control, the PLC controller is the core, and the relay serves as a signal expander and logic executor. The control process program built into the PLC controller controls its IO module. The IO module outputs a signal to control the action of the relay, and the relay auxiliary contacts control the on and off of the corresponding coil of the electromagnetic reversing valve, thereby realizing the action of the electromagnetic reversing valve controlled by the PLC controller according to the process.

[0057] The conversion switch in the electrical control part can select the circuit that controls the on and off of the electromagnetic reversing valve coil by switching the circuit. There are three circuit options, namely three control modes: automatic control mode, which is selected for the normal operation of the equipment. In this mode, the auxiliary contacts of the relay controlled by the PLC controller serve as the switch for on and off the electromagnetic reversing valve coil. When the electromagnetic reversing valve coil is energized, the electromagnetic reversing valve controls the opening and closing of the corresponding hydraulic valve according to the control signal of the PLC controller; when the electromagnetic reversing valve is de-energized, the corresponding hydraulic valve remains in the current open or closed state.

[0058] Manual control mode: This mode is selected during the equipment debugging phase. In this mode, the button switch on the cabinet door panel is used as the switch to turn on and off the power to the solenoid reversing valve coil. There are two button switches on the cabinet door panel corresponding to the solenoid reversing valve, one for power on and one for power off. When the power-on button switch is pressed, the solenoid reversing valve coil is energized, and the solenoid reversing valve controls the opening and closing of the corresponding hydraulic valve; when the power-off button switch is pressed, the solenoid reversing valve is de-energized, and the corresponding hydraulic valve remains in the current open or closed state.

[0059] Remote control mode is selected when automatic control fails. In this mode, the auxiliary contacts of the relay controlled by the control contacts of the monitoring system are used as the switch to turn on and off the power of the electromagnetic reversing valve coil. In the automatic control mode, once the PLC controller fails to power off, it automatically switches to the remote control mode by closing the circuit contacts. When the remote monitoring system controls the electromagnetic reversing valve coil to be energized, the electromagnetic reversing valve controls the corresponding hydraulic valve to open or close. When the remote monitoring system controls the electromagnetic reversing valve to be de-energized, the corresponding hydraulic valve maintains the current fully open or fully closed state.

[0060] Signal transmission from the PLC controller is accomplished through both hard-contact and serial communication transmission methods. The hard-contact transmission method collects the fully closed and fully open position feedback signals of all hydraulic valves. Each signal is amplified through its own relay. One set of relay auxiliary contacts is sent to the PLC controller as an input signal for the control process, while another set is sent to the monitoring system via wiring terminals. The communication transmission method involves the PLC controller receiving the signals from the auxiliary contacts of the relays and connecting to the monitoring system via the RJ45 port on the PLC controller using the RS485 communication protocol. This converts the fully closed and fully open position feedback signals of each hydraulic valve into communication words for communication with the monitoring system.

[0061] The PLC controller used in the present invention is Schneider M340 or M580 series PLC, SIEMENS S7-1200 or S7-1500 series PLC, and the electromagnetic reversing valve is a two-position four-way double-coil electromagnetic reversing valve.

Claims

1. A pumped storage unit water pressure exhaust control device, characterized by: The invention comprises an electrical control part, a working oil pipe valve part, an oil inlet pipe (1), an oil return pipe (2) and an oil distribution valve block (5), wherein the working oil pipe valve part comprises at least six sets; the working oil pipe valve part comprises a first working oil pipe (3), a second working oil pipe (4), an electromagnetic reversing valve (6) and a hydraulic valve (7), wherein one electromagnetic reversing valve (6) controls one hydraulic valve (7); an oil inlet bin (8) and an oil outlet bin (9) are provided in the oil distribution valve block (5); the electromagnetic reversing valve (6) is provided on the oil distribution valve block (5) and is respectively connected to the oil inlet bin (8) and the oil outlet bin (9). The oil inlet pipe (1) is connected to the pressure oil tank at one end, and the other end is connected to the oil inlet pipe (8) of the oil distribution valve block (5); the oil return pipe (2) is connected to the oil outlet pipe (9) on the oil distribution valve block (5), and the other end is connected to the oil return tank; the first working oil pipe (3) is connected to the first working oil port (10) on the oil distribution valve block (5), and the other end is connected to the hydraulic valve opening control chamber; the second working oil pipe (4) is connected to the second working oil port (11) on the oil distribution valve block (5), and the other end is connected to the hydraulic valve closing control chamber; The electrical control part includes a PLC controller (12), a relay (13), a push button switch (15) and a transfer switch (14). The PLC controller (12) is connected in series with the relay (13), and then connected in parallel with the push button switch (15), and then connected in series with the transfer switch (14). The push button switch (15) is electrically connected to the electromagnetic reversing valve (6), and the auxiliary contact of the relay (13) is electrically connected to the electromagnetic reversing valve (6). In the automatic control mode, the manual control switch (14) is switched to the electrical control part to energize the electrical control part, and the PLC controller (12) in the electrical control part controls the auxiliary contacts of the relay (13) to control the energization and de-energization of the electromagnetic reversing valve (6) coil; when the electromagnetic reversing valve (6) coil is energized, the electromagnetic reversing valve (6) receives the control signal from the PLC controller (12) to control the corresponding hydraulic valve (7) to open or close; when the electromagnetic reversing valve (6) coil is de-energized, the valve position remains unchanged, and the corresponding hydraulic valve (7) maintains the current state; In manual control mode, the manual control conversion switch (14) is switched to the control button switch (15) to be energized, and the manual control button switch (15) controls the solenoid reversing valve (6) coil to be energized and de-energized; when the solenoid reversing valve (6) coil is energized, the solenoid reversing valve (6) receives the control signal from the button switch (15) to control the corresponding hydraulic valve (7) to be opened or closed; when the solenoid reversing valve (6) coil is de-energized, the valve position remains unchanged, and the corresponding hydraulic valve (7) maintains the current state; When the PLC controller fails, it automatically switches to the remote control mode, and the monitoring system controls the auxiliary contacts of the access relay (13) to control the power on and off of the solenoid reversing valve (6) coil; when the solenoid reversing valve (6) coil is energized, the solenoid reversing valve (6) receives the control signal of the monitoring system to control the corresponding hydraulic valve (7) to open or close; when the solenoid reversing valve (6) coil is de-energized, the valve position remains unchanged, and the corresponding hydraulic valve (7) maintains the current state.

2. A pumped storage unit pressurized water exhaust control device according to claim 1, characterized in that: When in manual control or remote control, the other two control modes are in cold standby state; when in automatic control, the remote control mode is in hot standby state.

3. The pumped storage unit pressurized water exhaust control device according to claim 1, characterized in that: Each oil pipe of the working oil pipe valve portion is provided with a manual valve (16).

4. The pumped storage unit pressurized water exhaust control device according to claim 1, characterized in that: The electromagnetic reversing valve (6) is relatively independent of the hydraulic valve control signal.

5. The pumped storage unit pressurized water exhaust control device according to claim 1, characterized in that: The electrical control part further comprises: a wiring terminal (17); the wiring terminal (17) is connected in parallel with the PLC controller (12) and then in series with the power supply circuit.

6. The pumped storage unit pressurized water exhaust control device according to claim 5, characterized in that: The wiring terminal (17) transmits fully closed and fully open position feedback signals of the hydraulic valve (7) to the monitoring system.

7. The pumped storage unit pressurized water exhaust control device according to claim 5, characterized in that: The power supply circuit comprises: a switching power supply (18) and a miniature circuit breaker (19), wherein the switching power supply (18) and the miniature circuit breaker (19) are connected in series.

8. The pumped storage unit pressurized water exhaust control device according to claim 1, characterized in that: The electrical control part and the working oil pipe valve part are placed in a standard cabinet (20), with the electrical control part at the upper part and the working oil pipe valve part at the lower part.

9. The pumped storage unit pressurized water exhaust control device according to claim 8, characterized in that: The standard cabinet (20) is a standard cabinet body with dimensions of 800 mm in width, 800 mm in depth, and 2200 mm in height.

10. The pumped storage unit pressurized water exhaust control device according to claim 8, characterized in that: The standard cabinet (20) is provided with an indicator light (21), a change-over switch (14) and a push button switch (15).

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