Pumped storage unit pressurized water exhaust control device

Abstract

The invention discloses a water pumping and air exhausting control device for a pumped storage unit, and relates to the technical field of pumped storage units. During manual control, an electromagnetic reversing valve and a button switch are powered on through switching of a change-over switch, and the button switch is controlled to control the electromagnetic reversing valve to be powered on and powered off; in the automatic control process, the electrical control part and the electromagnetic reversing valve are switched to be powered on through the change-over switch, and a PLC in the electrical control part controls the electromagnetic reversing valve to be powered on and powered off according to a set process. And when the PLC is invalid, the monitoring system controls the access auxiliary contact to control the power-on and power-off of the electromagnetic reversing valve. The device has manual control, automatic control and remote control, the remote control realizes the control part of the existing technical scheme, the manual control can realize the valve action test requirement in the equipment debugging process, the automatic control also independently undertakes the control task when the pressurized water exhaust flow is executed, and meanwhile, the remote control is used as a standby, so that the manual control is more convenient. And the redundancy of the control part is enhanced.

Description

Technical Field

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

[0002] During the conversion of different working conditions, the pumped storage unit needs to execute the "inflating and water pressing process", "working condition conversion exhaust and water return process" and "shutdown exhaust and water return process" as required. The execution of the above three processes requires the control of the opening and closing of multiple hydraulic valves with different position functions to achieve the action of inflating and water pressing or exhaust and water return in the runner chamber, thereby controlling the purpose of phase adjustment water level. The opening and closing of each hydraulic valve is achieved by controlling the corresponding double-coil electromagnetic reversing valve.

[0003] The existing technical solution is to install an electromagnetic reversing valve to control the opening and closing of the hydraulic valve installed automatically (i.e. in the power plant), and the corresponding coil of the electromagnetic reversing valve is remotely operated by the power plant monitoring system. The hydraulic valve position signal is transmitted to the power plant monitoring system through a hard contact, providing the monitoring system with the feedback signal required for the control process.

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

[0005] 2. The control method is single, the control part lacks backup control solutions, and the redundancy of the control part is low, which affects the safety of the factory.

[0006] 3. Separating the signal transmission control and pipeline parts makes it impossible to collect and send the hydraulic valve position signal while operating the hydraulic valve to perform the specified action. Summary of the invention

[0007] 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", "operating condition conversion exhaust and water return process" and "shutdown exhaust and water return process", and have no redundant control capability; 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, and a pumped storage unit water pressure exhaust control device is provided.

[0008] To achieve the above purpose, the technical solution adopted by the present invention is as follows: 1. A pumped storage unit water pressure exhaust control device, characterized in that it includes an electrical control part, a working oil pipe valve part, an oil inlet pipe, an oil return pipe and an oil distribution valve block, and the working oil pipe valve part includes at least six sets; the working oil pipe valve part includes a first working oil pipe, a second working oil pipe, an electromagnetic reversing valve and a hydraulic valve, and one electromagnetic reversing valve controls one hydraulic valve correspondingly; an oil inlet bin and an oil return bin are arranged in the oil distribution valve block; the electromagnetic reversing valve is arranged on the oil distribution valve block and is connected with the oil inlet bin and the oil outlet bin respectively; one end of the oil inlet pipe is connected to the pressure oil tank, and the other end is connected with the oil inlet bin of the oil distribution valve block; one end of the return oil pipe is connected with the oil outlet bin on the oil distribution valve block, and the other end of the return oil pipe is connected to the return oil tank; one end of the first working oil pipe is connected to the first working oil port on the oil distribution valve block, and the other end is connected to the hydraulic valve opening control chamber; one end of the second working oil pipe is connected to the second working oil port on the oil distribution valve block, and the other end is connected to the hydraulic valve working closing control chamber; 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 connected in parallel with the push button switch, and then connected in series with the transfer switch; the push button switch is electrically connected to the electromagnetic reversing valve, and the auxiliary contact of the relay is electrically connected to the electromagnetic reversing valve; In the automatic control mode, the manual control conversion switch is switched to the electrical control part to energize, and the PLC controller in the electrical control part controls the relay auxiliary contacts to control the electromagnetic reversing valve coil to energize and de-energize; when the electromagnetic reversing valve coil is energized, the electromagnetic reversing valve receives the control signal of the PLC controller to control the corresponding hydraulic valve to open or close; when the electromagnetic reversing valve coil is de-energized, the valve position remains unchanged, and the corresponding hydraulic valve maintains the current state; 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 energization and de-energization 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; 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 electromagnetic reversing valve coil; when the electromagnetic reversing valve coil is energized, the electromagnetic reversing valve receives the control signal of the monitoring system to control the corresponding hydraulic valve to open or close; when the electromagnetic reversing valve coil is de-energized, the valve position remains unchanged, and the corresponding hydraulic valve maintains the current state.

[0009] When in any one of the control modes of 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.

[0010] Each oil pipe of the working oil pipe valve part is provided with a manual valve.

[0011] The electromagnetic reversing valve is relatively independent of the control signal of the hydraulic valve.

[0012] The electrical control part also includes: a wiring terminal; the wiring terminal is connected in parallel with the PLC controller and then in series with the power supply circuit.

[0013] The wiring terminal transmits the fully closed and fully opened position feedback signals of the hydraulic valve to the monitoring system.

[0014] The power supply circuit comprises: a switching power supply and a miniature circuit breaker, wherein the switching power supply and the miniature circuit breaker are connected in series.

[0015] 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.

[0016] The standard cabinet is a standard cabinet with dimensions of 800 mm in width, 800 mm in depth and 2200 mm in height.

[0017] The standard cabinet is provided with an indicator light, a conversion switch and a button switch.

[0018] The advantages of adopting the present invention are: 1. Compared with the prior art, the present invention is an electromechanical combined cabinet, which 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 hydraulic valves to perform specified actions, and can also collect and send hydraulic valve position signals, so as to complete the specific functions of the water pressure and exhaust control process relatively independently, eliminating the influence of other systems.

[0019] 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 undertakes the control task when executing the water pressure exhaust process. At the same time, there is remote control as a backup, which enhances the redundancy of the control function.

[0020] 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

[0021] Figure 1 It is a front view of the pressurized water exhaust control device; Figure 2 This is the rear view of the pressurized water exhaust control device; Figure 3 This is the cabinet door view of the pressurized water exhaust control device; Figure 4This is a side view of the working oil pipe valve part of the pressurized water exhaust control device; Figure 5 This is a perspective view of the oil distribution valve block of the pressurized water exhaust control device; Figure 6 This is a schematic diagram of the hydraulic valve of the pressurized water exhaust control device.

[0022] Figure numerals: 1. Oil inlet pipeline, 2. Oil return pipeline, 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. Switch power supply, 19. WeChat circuit breaker, 20. Standard cabinet, 21. Indicator light. DETAILED DESCRIPTION

[0023] Example 1 This embodiment further illustrates the structure and principle of the present invention in conjunction with the accompanying drawings: A pumped storage unit water pressure exhaust control device, comprising an electrical control part, a working oil pipe valve part, an oil inlet pipeline 1, an oil return pipeline 2 and an oil distribution valve block 5, wherein the working oil pipe valve part is 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 tank 8 and an oil return tank 9 are arranged in the oil distribution valve block 5; the electromagnetic reversing valve 6 is arranged on the oil distribution valve block 5 and respectively It is connected with the oil inlet bin 8 and the oil outlet bin 9; one end of the oil inlet pipe 1 is connected to the pressure oil tank, and the other end is connected with the oil inlet bin 8 of the oil distributor valve block 5; one end of the return oil pipe 2 is connected with the oil outlet bin 9 on the oil distributor valve block 5, and the other end of the return oil pipe 1 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 distributor 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 distributor 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 conversion 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 conversion switch 14 respectively; 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 conversion switch 14 is switched to the electrical control part to be energized, and the PLC controller 12 in the electrical control part controls the auxiliary contact of the relay 13 to control 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 of the PLC controller 12 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; 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 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 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.

[0024] When in any one of the control modes of 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.

[0025] A manual valve 16 is provided on each oil pipe of the working oil pipe valve part.

[0026] The electromagnetic reversing valve 5 is relatively independent of the hydraulic valve control signal.

[0027] 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.

[0028] The wiring terminal 17 transmits the fully closed and fully opened position feedback signals of the hydraulic valve 7 to the monitoring system.

[0029] The power supply circuit includes: a switching power supply 18 and a miniature circuit breaker 19, and the switching power supply 18 and the miniature circuit breaker 19 are connected in series.

[0030] 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.

[0031] 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.

[0032] The standard cabinet 20 is provided with an indicator light 21 , a conversion switch 14 and a button switch 15 .

[0033] Example 2 like Figure 1-4 As shown, the pumped storage unit water pressure 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.

[0034] A standard cabinet 20 of 800mm×800mm×2200mm (width×depth×height) is used as a carrier. The upper part of the cabinet is the electrical control part, and the lower part is the working oil pipe valve part; the electrical control part mainly includes a PLC controller 12, a relay 13, a terminal block 17, and low-voltage electrical components such as a miniature circuit breaker 19 and a switching power supply 18 connected in series; the working oil pipe valve part mainly includes devices such as an electromagnetic reversing valve 6, a hydraulic valve 7, an oil distribution valve block 5 and a manual valve 16.

[0035] There is an indicator light 21 on the door panel of the cabinet. When the hydraulic valve 7 is in the fully open or fully closed position, the corresponding indicator light is on to display the valve position status of the hydraulic valve 7. The hydraulic valve 7 is located in the part of the pressurized water exhaust work area. The upper part of the cabinet is installed with low-voltage electrical components to form a control circuit, and the coil action of different electromagnetic reversing valves 6 is controlled by the PLC controller 12. The oil distribution valve block 5 is installed in the lower part of the cabinet, and the electromagnetic reversing valve pipeline is formed by the oil distribution valve block 5, the electromagnetic reversing valve 6, and the hydraulic valve 7. All electromagnetic reversing valve pipelines share the oil inlet pipeline 1 and the oil return pipeline 2. The respective first working oil ports 10 and second working oil ports 11 are connected to the hydraulic valve control chamber in the factory through pipelines. Each hydraulic valve 7 independently controls a pipeline through its own electromagnetic reversing valve 6 signal, and forms a complete loop of pressure oil tank-oil inlet-electromagnetic reversing valve-hydraulic valve-electromagnetic reversing valve-oil return port-oil return tank. The electromagnetic reversing valve 6 can only control the hydraulic valve 7 of the corresponding pipeline.

[0036] 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 of the hydraulic valve 7 and the control mechanism.

[0037] During automatic control, the PLC controller is the core, and the relay is used as a signal expansion and logic executor. The IO module is controlled by the control process program built into the PLC controller. The output signal of the IO module controls 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.

[0038] 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 are used as the switch to turn 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.

[0039] Manual control mode: This mode is selected during the equipment debugging phase. This mode selects the button switch on the cabinet door panel 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, which correspond to power on and power off respectively. 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 powered off, and the corresponding hydraulic valve maintains the current open or closed state.

[0040] Remote control mode: This mode is selected when automatic control fails. This mode selects the auxiliary contacts of the relay controlled by the control contacts of the monitoring system as the switch for turning on and off 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 power on, the electromagnetic reversing valve controls the corresponding hydraulic valve to open or close. When the remote monitoring system controls the electromagnetic reversing valve to power off, the corresponding hydraulic valve maintains the current fully open or fully closed state.

[0041] The signal transmission of the PLC controller is completed through hard contact transmission and serial communication transmission. The hard contact transmission method is to collect the fully closed and fully open position feedback signals of all hydraulic valves. Each signal is expanded through its own relay. One group of auxiliary contacts of the relay is sent to the PLC controller as the input signal of the control process, and the other group is sent to the monitoring system through the wiring terminal. The communication transmission method is that the PLC controller receives the signal input by the auxiliary contacts of the above relays, and connects to the monitoring system through the RJ45 interface on the PLC controller using the RS485 communication protocol, and converts the fully closed and fully open position feedback signals of each hydraulic valve into communication words to communicate with the monitoring system.

[0042] The PLC controller used in the present invention is Schneider M340 or M580 series PLC or 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 in that: 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) correspondingly; an oil inlet bin (8) and an oil return bin (9) are arranged in the oil distribution valve block (5); the electromagnetic reversing valve (6) is arranged on the oil distribution valve block (5) and is respectively connected to the oil inlet bin (8) and the oil return bin (9) The oil inlet pipe (1) is connected to the oil pressure 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 of the oil return pipe (1) 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) at one end, and the other end is connected to the hydraulic valve opening control chamber at the other end; the second working oil pipe (4) is connected to the second working oil port (11) on the oil distribution valve block (5) at one end, and the other end is connected to the hydraulic valve closing control chamber at the other end; The electrical control part comprises a PLC controller (12), a relay (13), a push button switch (15) and a conversion switch (14); the PLC controller (12) is connected in series with the relay (13), then connected in parallel with the push button switch (15), and then connected in series with the conversion 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 conversion switch (14) is switched to the electrical control part to energize, and the PLC controller (12) in the electrical control part controls the auxiliary contact of the relay (13) to control the solenoid reversing valve (6) coil to energize and de-energize; 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; 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 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 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 any one of the control modes of 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. A 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. A pumped storage unit pressurized water exhaust control device according to claim 1, characterized in that: The electromagnetic reversing valve (5) is relatively independent of the hydraulic valve control signal.

5. A 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 a power supply circuit.

6. A 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. A 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. A 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. A 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. A 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 conversion switch (14) and a button switch (15) arranged on the standard cabinet (20).

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