Control system and operation method of guide vane servomotor locking device of water-turbine generator set

Abstract

The invention discloses a water-turbine generator set guide vane servomotor locking device control system and an electrical unit. The electrical unit comprises a speed regulator control cabinet, a set local control unit local cabinet, a speed regulator electrical cabinet and a locking unit, and the locking unit comprises a locking electromagnetic valve and a locking device. The automatic control device has the beneficial effects that errors caused by pure mechanical operation are reduced by automatically controlling the input and exit processes of the locking device, the accuracy and repeatability of operation are ensured, and multiple control modes such as the speed regulator control cabinet, the speed regulator electrical cabinet and the unit local control unit local cabinet are adopted; according to the control method, the time needed by the input and exit process of the locking device is shortened, the emergency handling capacity of the system is improved, equipment damage and maintenance cost caused by improper purely mechanical manual input and exit are reduced, the control method has good universality and adaptability, the requirements of different working conditions are met, and the control method is suitable for popularization and application. And the requirements of the hydropower station on intelligence, automation and remote control are combined.

Description

Technical Field

[0001] The present invention relates to the field of automatic control of hydropower station equipment, and in particular to a control system and an operating method for a locking device of a guide vane servomotor of a hydro-generator set. Background Art

[0002] The guide vane servo locking device of a large hydro-turbine generator set is one of the key devices in the hydropower generation system. Its function is to prevent accidents caused by misoperation when the unit is shut down or under maintenance. The guide vane servo needs to be locked. In certain circumstances, the governor servo needs to be locked in a safe position to prevent accidental movement that may cause possible unit damage or safety accidents.

[0003] Traditional locking control methods often rely on manual operation or simple mechanical locking, which not only has a slow response speed but also cannot achieve remote monitoring and control, posing a hidden danger to production safety. Therefore, the development of a relay locking device and its control method that can be remotely automatically controlled and monitored is of great significance for improving the operational safety and convenience of turbines. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is that the traditional guide vane servo locking control cannot achieve remote monitoring and control, which brings hidden dangers to production safety.

[0005] The above technical problems are solved by the following technical solutions: The present invention proposes a control system for a guide vane servo locking device of a hydro-turbine generator set, which includes an electrical unit, wherein the electrical unit includes a governor control cabinet, a local cabinet of a unit local control unit, and a governor electrical cabinet. The governor control cabinet, the governor electrical cabinet, and the local cabinet of the unit local control unit are connected through an electrical control circuit, and the control priority of the governor control cabinet is higher than that of the governor electrical cabinet and the local cabinet of the unit local control unit.

[0006] The locking unit includes a locking solenoid valve and a locking device. The locking solenoid valve is installed on the locking device control pipeline and receives the control signal output by the electrical control circuit. The locking device is connected to the locking solenoid valve to perform locking and unlocking operations.

[0007] In a preferred embodiment of the control system of the guide vane servo locking device of the hydro-turbine generator set according to the present invention: the speed governor control cabinet is provided with a lock-in button SB10, a lock-out button SB11, a lock-in indicator light HL1, and a lock-out indicator light HL2; the speed governor control cabinet can manually operate the lock-in and lock-out through the lock-in button SB10 and the lock-out button SB11, and display the lock position status signal through the lock-in indicator light HL1 and the lock-out indicator light HL2.

[0008] In a preferred embodiment of the control system of the guide vane relay locking device of the hydro-turbine generator set described in the present invention: a PLC controller is configured inside the local cabinet of the on-site control unit of the unit, which can realize the startup process and shutdown process of the monitoring system, and output the locking control command according to the startup process or shutdown process, and transmit its signal to the electrical control circuit in the speed regulator control cabinet.

[0009] In a preferred embodiment of the control system of the guide vane servo locking device of the hydro-turbine generator set described in the present invention: the speed regulator electrical cabinet is provided with a lock-in button SB12, a lock-out button SB13, a lock-in indicator light HL3, and a lock-out indicator light HL4. The lock-in and lock-out can be manually operated by the lock-in button SB12 and the lock-out button SB13, and the control command output by the local cabinet of the on-site control unit of the unit can also be accepted, and the lock position status signal can be displayed by the lock-in indicator light HL3 and the lock-out indicator light HL4.

[0010] In a preferred embodiment of the control system of the guide vane relay locking device of the hydro-turbine generator set of the present invention: the speed governor control cabinet and the speed governor electrical cabinet are connected through an electrical control circuit, and the local cabinet of the unit's on-site control unit is directly connected to the speed governor control cabinet through an independent control cable.

[0011] In a preferred embodiment of the control system of the guide vane servo locking device of the hydro-turbine generator set described in the present invention: the control mode of the locking device includes a semi-automatic control mode and an automatic control mode, the semi-automatic control mode is manually operated through the speed regulator control cabinet or the speed regulator electrical cabinet, and the automatic control mode is automatically executed by the PLC controller of the local cabinet of the unit's on-site control unit.

[0012] In a preferred embodiment of the control system of the guide vane servo locking device of the hydro-turbine generator set described in the present invention: the local / remote switching handle SW1 of the hydraulic system in the electrical control circuit needs to adopt a pair of normally open and normally closed nodes, and the normally closed resets when the normally open action is performed, to ensure that the local / remote switching mode of the hydraulic system has only one mode valid, and the locking operation of the locking device must be performed when the guide vane is in the fully closed position, and the locking exit operation does not require the locking guide vane fully closed signal.

[0013] In a preferred embodiment of the control system of the guide vane servo locking device of the hydro-generator set according to the present invention: the locking solenoid valve is installed on the control oil pipeline of the servo locking device in the waterwheel chamber, the locking solenoid valve is arranged on the pipeline in the waterwheel chamber close to the locking device, and the control circuits of the locking input solenoid valve SDTR and the locking exit solenoid valve SDTC in the locking solenoid valve are respectively connected with diodes D25 and D26 to protect the components in the control circuit from damage.

[0014] The present invention also provides an operating method for a control system of a guide vane servomotor locking device of a hydro-generator set.

[0015] The locking device activation control process includes the following steps:

[0016] S0: Start the lock input control process;

[0017] S1: Determine whether the local / remote switching handle of the hydraulic system is in the local control mode. If yes, execute S2; otherwise, execute S8.

[0018] S2: Determine whether the spindle lock input button SB10 of the speed regulator control cabinet is actuated. If so, execute S3; otherwise, execute S5.

[0019] S3: Determine whether the lock input button delay time △t1 has expired. If so, execute S14; otherwise, execute S4.

[0020] S4: Continue to lock the input button of the speed regulator control cabinet;

[0021] S5: Determine whether the lock exit button SB11 of the speed regulator control cabinet is activated. If so, execute S6; otherwise, execute S7.

[0022] S6: Execute the lock exit control process;

[0023] S7: The speed regulator control cabinet is locked and put into manual operation but not executed;

[0024] S8: Determine whether the local / remote switching handle of the hydraulic system is in the remote position. If yes, execute S9;

[0025] S9: Determine whether the local cabinet of the unit's local control unit outputs a lock-in command, that is, whether the K1 relay is energized. If so, execute S14; otherwise, execute S10.

[0026] S10: Determine whether the lock-in button SB12 of the speed regulator electrical cabinet is activated. If so, execute S11; otherwise, execute S12.

[0027] S11: Determine whether the lock input button delay time △t2 has expired. If so, execute S14; otherwise, execute S13.

[0028] S12: The speed regulator control cabinet is locked and put into manual operation but not executed;

[0029] S13: Continue to lock the input button of the speed regulator electrical cabinet;

[0030] S14: Determine whether the guide vane is in the fully closed position, that is, whether the KAUX10 relay in the fully closed position is energized. If so, execute S15; otherwise, execute S16.

[0031] S15: Locking input execution conditions are met;

[0032] S16: Locking input execution conditions are not met;

[0033] S17: Determine whether the locking electromagnetic valve relay KAUX26 is energized. If so, execute S19; otherwise, execute S18.

[0034] S18: The lock input control loop does not meet the conditions;

[0035] S19: The locking input control loop meets the conditions and executes the locking input control loop;

[0036] S20: The lock-in solenoid valve is turned on and the lock-out solenoid valve is turned off;

[0037] S21: The locking device is engaged.

[0038] In a preferred embodiment of the method for operating a control system for a guide vane servomotor locking device of a hydro-generator set according to the present invention:

[0039] The locking device exit control process includes the following steps:

[0040] S0: Start the lock exit control process;

[0041] S1: Determine whether the local / remote switching handle of the hydraulic system is in the local control mode. If yes, execute S2; otherwise, execute S8.

[0042] S2: Determine whether the lock spindle exit button SB11 of the speed regulator control cabinet is actuated. If so, execute S3; otherwise, execute S5.

[0043] S3: Determine whether the lock exit button delay time △t3 has expired. If so, execute S14; otherwise, execute S4.

[0044] S4: Continue to hold the governor control cabinet locked and the exit button;

[0045] S5: Determine whether the lock exit button SB11 of the speed regulator control cabinet is activated. If so, execute S6; otherwise, execute S7.

[0046] S6: Execute the lock input control process;

[0047] S7: The speed regulator control cabinet lock exit manual operation is not executed;

[0048] S8: Determine whether the local / remote switching handle of the hydraulic system is in the remote position. If yes, execute S9;

[0049] S9: Determine whether the local cabinet of the local control unit of the unit outputs a lock exit command, that is, whether the K2 relay is energized. If yes, execute S14; otherwise, execute S10.

[0050] S10: Determine whether the lock exit button SB13 of the speed regulator electrical cabinet is activated. If so, execute S11; otherwise, execute S12.

[0051] S11: Determine whether the lock exit button delay time △t4 has expired. If so, execute S14; otherwise, execute S13.

[0052] S12: The speed regulator control cabinet lock exit manual operation is not executed;

[0053] S13: Continue to hold the exit button of the speed regulator electrical cabinet locked;

[0054] S14: Lock exit execution condition is met;

[0055] S15: Determine whether the lock exit solenoid valve relay KAUX27 is energized. If so, execute S17; otherwise, execute S16.

[0056] S16: Locking the exit control loop does not meet the conditions;

[0057] S17: The lock exit control loop meets the conditions and executes the lock exit control loop;

[0058] S18: The lock-out solenoid valve is turned on and the lock-in solenoid valve is turned off;

[0059] S21: The locking device exits.

[0060] The beneficial effects of the present invention are: improving the automation level and operational convenience of the turbine governor relay locking, reducing errors caused by purely mechanical operations through automated control of the locking device's engagement and exit processes, ensuring the accuracy and repeatability of operations, shortening the time required for the locking device engagement and exit processes through multiple control methods of the governor control cabinet, governor electrical cabinet and unit on-site control unit local cabinet, improving the system's ability to handle emergencies, and reducing equipment damage and maintenance costs caused by improper purely mechanical manual engagement and exit. The control method is applicable to turbines with various head and water flow conditions, has good versatility and adaptability, meets the needs of different working conditions, and combines the hydropower station's needs for intelligence, automation and remote control. The control method of the present invention provides effective technical support for the modernization and upgrading of hydropower stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0062] Figure 1 The control structure diagram of the control system of the guide vane servo locking device of the turbine generator set is shown;

[0063] Figure 2 The electrical schematic diagram of the control system of the guide vane servo locking device of the turbine generator set is shown;

[0064] Figure 3 Shows a locking device input control flow chart;

[0065] Figure 4 A locking device exit control flow chart is shown. DETAILED DESCRIPTION

[0066] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0067] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but rather as the meanings of the terms and the overall description of the present invention.

[0068] Reference Figures 1 and 2 This embodiment provides a control system for a guide vane servomotor locking device of a hydro-turbine generator set, including an electrical unit 1 and a locking unit 2. The electrical unit 1 and the locking unit 2 can automatically or manually quickly and safely control the locking and unlocking of the servomotor, and can also monitor the status information of the locking device in real time, thereby greatly improving the reliability of the system and the flexibility of operation.

[0069] Specifically, the speed regulator control cabinet 11 is provided with a lock-in button SB10, a lock-out button SB11, a lock-in indicator light HL1, and a lock-out indicator light HL2. The speed regulator control cabinet 11 can be manually operated to lock in and lock out through the lock-in button SB10 and the lock-out button SB11, and the lock position status signal is displayed through the lock-in indicator light HL1 and the lock-out indicator light HL2. In this embodiment, the speed regulator control cabinet 11 is installed in the turbine layer, and the electrical control circuit is hard-wired in the speed regulator control cabinet 11. The electrical control circuit is divided into four parts: power supply circuit, lock-in control condition, lock-out control condition, lock-in control circuit, and lock-out control circuit. It is mainly composed of switching handles, buttons, relays, diodes, indicator lights and other equipment. Among them, the power supply circuit is a prior art and is not specifically limited here.

[0070] Specifically, the local cabinet 12 of the unit's on-site control unit is equipped with a PLC controller, which can monitor the system's startup and shutdown processes, and output a locking control command according to the startup process or shutdown process, and transmit its signal to the electrical control circuit in the speed regulator control cabinet 11. In this embodiment, the local cabinet 12 of the unit's on-site control unit is installed on the generator layer.

[0071] Specifically, the speed regulator electrical cabinet 13 is provided with a lock-in button SB12, a lock-out button SB13, a lock-in indicator light HL3, and a lock-out indicator light HL4. The lock-in button SB12 and the lock-out button SB13 can be used to manually operate the lock-in and lock-out. It can also accept the control command output by the local cabinet 12 of the unit's on-site control unit, and display the lock position status signal through the lock-in indicator light HL3 and the lock-out indicator light HL4. In this embodiment, the speed regulator electrical cabinet 13 is installed on the generator layer.

[0072] Reference Figures 1 and 2 As an optional embodiment, the speed regulator control cabinet 11 and the speed regulator electrical cabinet 13 are connected through an electrical control circuit, and the local cabinet 12 of the unit local control unit is directly connected to the speed regulator control cabinet 11 through an independent control cable. In this embodiment, the control command output by the local cabinet 12 of the unit local control unit is directly led from the local cabinet 12 of the unit local control unit to the speed regulator control cabinet 11 through an independent control cable, without the need for transfer wiring in the speed regulator electrical cabinet 13, and without passing through the PLC output in the speed regulator electrical cabinet and the PLC output in the speed regulator control cabinet, so as to reduce the failure points in the transfer link, so that in an emergency, the monitoring system can remotely implement remote activation and deactivation of the locking device directly through manual operation.

[0073] Reference Figures 1 and 2As an optional embodiment, the control mode of the locking device 22 includes a semi-automatic control mode and an automatic control mode. The semi-automatic control mode is manually operated through the speed regulator control cabinet 11 or the speed regulator electrical cabinet 13, and the automatic control mode is automatically executed by the PLC controller of the local cabinet 12 of the unit local control unit. In this embodiment, the locking device 22 can realize the two functions of locking in and out at three places, namely the speed regulator control cabinet, the speed regulator electrical cabinet and the local cabinet of the unit local control unit. The speed regulator control cabinet 11 has the highest control priority to ensure that the on-site electrician can manually activate and deactivate the locking device 22 in an emergency. The second highest priority is the speed regulator electrical cabinet 13 and the local cabinet 12 of the unit local control unit. The locking device can be operated at different physical locations, which is convenient for on-site equipment maintenance and operation and improves equipment reliability.

[0074] Reference Figures 1 and 2 As an optional embodiment, the local / remote switching handle SW1 of the hydraulic system in the electrical control circuit needs to adopt a pair of normally open and normally closed nodes, and the normally closed resets when the normally open action is performed, to ensure that the local / remote switching mode of the hydraulic system has only one mode valid, and the locking operation of the locking device 22 must be performed when the guide vane is in the fully closed position, and the locking exit operation does not require the locking guide vane fully closed signal. In this embodiment, when the governor control cabinet 11 performs the locking device 22 activation and exit operations, the local / remote handle of the hydraulic system must be switched to the local mode; when the governor electrical cabinet 13 and the local cabinet 12 of the unit local control unit perform the locking device activation and exit operations, the local / remote handle of the hydraulic system must be switched to the remote mode. When the local / remote switching handle SW1 of the hydraulic system is switched to the local mode, the normally open node is connected, and it is necessary to judge that the guide vane position must be in the fully closed state, that is, the KAUX10 excitation action.

[0075] Reference Figures 1 and 2 As an optional embodiment, diodes D25 and D26 are respectively connected to the control circuits of the locking solenoid valve SDTR and the locking exit solenoid valve SDTC in the locking solenoid valve 21 to protect the components in the control circuit from damage. Diodes D25 and D26 are respectively connected in parallel in the control circuit of the locking solenoid valve 21. The main reason is that the locking solenoid valve is frequently operated during actual operation, so as to effectively extend the service life of the solenoid valve and the control system and improve the stability and reliability of the system. The main function of adding a diode in the control circuit is that when the solenoid valve is powered off, the diode will be turned on, and the rebound voltage will be drawn to the diode to form a closed loop, thereby protecting the KAUX10, KAUX26, KAUX27 relays and other components in the locking input and locking exit control circuits from damage. In this embodiment, the locking solenoid valve 21 adopts a two-position four-way type, and ensures that there is sufficient flow interface in the four-way position to avoid overcurrent and overload when the solenoid valve is turned on.

[0076] Specifically, the lock input button SB10 and the lock input button SB12 adopt the Schneider brand, specification model: XB2-BW34B1C, red, normally open, 24V, ZB2BWB41C+ZB2BW34C; the lock exit button SB11 and the lock exit button SB13 adopt the Schneider brand, specification model: XB2-BW33B1C, green, normally open, 24V, ZB2BWB31C+ZB2BW33C; the lock input indicator light HL1 and the lock input indicator light HL3 adopt the Schneider brand, specification model: XB2-BVB4LC, red; the lock exit indicator light HL2, The lock-out indicator light HL4 adopts the Schneider brand, specification model: XB2-BVB3LC, green; the KAUX10, KAUX26, and KAUX27 relays adopt the Schneider brand, specification model: RXM4GB2BD, DC24V; the hydraulic system local / remote switching handle SW1 adopts a two-position self-locking key switch, specification model: XB2-BG45C (ZB2BZ105C+ZB2BG4C); the lock-in solenoid valve SDTR and the lock-out solenoid valve SDTC adopt the Rexroth brand, and the solenoid valve plug specification model: MSFG-24 / 42-50 / 60, 24VDC 4.5W42VAC 50 / 60HZ 917VA 1P00 / 65.

[0077] When in use, there are three types of lock-in control conditions and lock-in control circuits. One is the semi-automatic start-up control of the speed governor control cabinet 11. In this control mode, it is necessary to determine whether the local / remote switching handle SW1 of the hydraulic system is switched to the local mode, that is, the normally open node is connected, and it is necessary to determine whether the guide vane position must be in the fully closed state, that is, KAUX10 is excited. After the above conditions are met, the lock-in control command can be output by operating the start-up button SB10 of the speed governor control cabinet 11, that is, the lock spindle start-up KAUX26 is excited. At the same time, the lock spindle start-up signal KAUX26 is output to the lock-in solenoid valve SDTR, which can realize the start-up function of the locking device 22.

[0078] The second is the remote semi-automatic start-up control of the speed regulator electrical cabinet 13. In this mode, it is necessary to judge whether the local / remote switching handle SW1 of the hydraulic system is switched to the remote mode, that is, the normally closed node is connected, and it is necessary to judge that the guide vane position must be in the fully closed state, that is, KAUX10 is excited. After the above conditions are met, the lock start-up control command can be output by operating the start-up button SB12 of the speed regulator electrical cabinet 13, that is, the lock spindle start-up KAUX26 excitation action, and at the same time, the lock spindle start-up signal KAUX26 is output to the lock start-up solenoid valve SDTR, which can realize the start-up function of the locking device;

[0079] The third is the remote automatic start-up control of the local cabinet 12 of the local control unit of the unit. In this mode, it is first necessary to determine whether the local / remote switching handle SW1 of the hydraulic system is switched to the remote mode, that is, the normally closed node is connected, and it is necessary to determine that the guide vane position must be in the fully closed state, that is, KAUX10 is excited. After the above conditions are met, during the unit shutdown process, the PLC of the local cabinet 12 of the local control unit of the unit outputs the locking start-up control command, that is, the locking spindle is put into KAUX26 excitation action, and at the same time, the locking spindle input signal KAUX26 is output to the locking input solenoid valve SDTR, which can realize the locking device input function;

[0080] There are three types of lock exit control conditions and lock exit control circuits. The first is the semi-automatic exit control of the speed governor control cabinet 11. In this control mode, it is necessary to determine whether the local / remote switching handle SW1 of the hydraulic system is switched to the local mode, that is, the normally open node is connected. After the above conditions are met, the speed governor control 11 exit button SB11 can output the lock exit control command, that is, the lock spindle exit KAUX27 excitation action, and at the same time, the lock spindle exit signal KAUX27 is output to the lock exit solenoid valve SDTC, which can realize the exit function of the locking device;

[0081] The second is the remote semi-automatic exit control of the speed regulator electrical cabinet 13. In this mode, it is necessary to judge whether the local / remote switching handle SW1 of the hydraulic system is switched to the remote mode, that is, the normally closed node is connected. After the above conditions are met, the exit button SB13 of the speed regulator electrical cabinet 13 can be operated to output the lock exit control command, that is, the lock spindle exit KAUX27 excitation action, and at the same time, the lock spindle exit signal KAUX27 is output to the lock exit solenoid valve SDTC, which can realize the exit function of the locking device;

[0082] The third is the remote automatic exit control of the local cabinet 12 of the local control unit of the unit. In this mode, it is first necessary to determine whether the local / remote switching handle SW1 of the hydraulic system is switched to the remote mode, that is, the normally closed node is connected. After the above conditions are met, during the startup of the unit, the PLC of the local cabinet 12 of the local control unit of the unit outputs the lock exit control command, that is, the lock spindle exit KAUX27 excitation action, and at the same time, the lock spindle exit signal KAUX27 is output to the lock exit solenoid valve SDTC, which can realize the exit function of the locking device. The locking solenoid valve 21 is installed on the control oil pipeline of the relay locking device in the waterwheel room, and receives the lock input KAUX26 and lock spindle exit KAUX27 control signals output by the electrical control circuit.

[0083] Reference Figure 3 As an optional embodiment, a locking device control process in a control method for a guide vane servomotor locking device of a large hydro-generator set includes the following steps:

[0084] S0: Start the lock input control process;

[0085] S1: Determine whether the local / remote switching handle of the hydraulic system is in the local control mode. If yes, execute S2; otherwise, execute S8.

[0086] S2: Determine whether the spindle lock input button SB10 of the speed regulator control cabinet is actuated. If so, execute S3; otherwise, execute S5.

[0087] S3: Determine whether the lock input button delay time △t1 has expired. If so, execute S14; otherwise, execute S4.

[0088] S4: Continue to lock the input button of the speed regulator control cabinet;

[0089] S5: Determine whether the lock exit button SB11 of the speed regulator control cabinet is activated. If so, execute S6; otherwise, execute S7.

[0090] S6: Execute the lock exit control process;

[0091] S7: The speed regulator control cabinet is locked and put into manual operation but not executed;

[0092] S8: Determine whether the local / remote switching handle of the hydraulic system is in the remote position. If yes, execute S9;

[0093] S9: Determine whether the local cabinet of the unit's local control unit outputs a lock-in command, that is, whether the K1 relay is energized. If so, execute S14; otherwise, execute S10.

[0094] S10: Determine whether the lock-in button SB12 of the speed regulator electrical cabinet is activated. If so, execute S11; otherwise, execute S12.

[0095] S11: Determine whether the lock input button delay time △t2 has expired. If so, execute S14; otherwise, execute S13.

[0096] S12: The speed regulator control cabinet is locked and put into manual operation but not executed;

[0097] S13: Continue to lock the input button of the speed regulator electrical cabinet;

[0098] S14: Determine whether the guide vane is in the fully closed position, that is, whether the KAUX10 relay in the fully closed position is energized. If so, execute S15; otherwise, execute S16.

[0099] S15: Locking input execution conditions are met;

[0100] S16: Locking input execution conditions are not met;

[0101] S17: Determine whether the locking electromagnetic valve relay KAUX26 is energized. If so, execute S19; otherwise, execute S18.

[0102] S18: The lock input control loop does not meet the conditions;

[0103] S19: The locking input control loop meets the conditions and executes the locking input control loop;

[0104] S20: The lock-in solenoid valve is turned on and the lock-out solenoid valve is turned off;

[0105] S21: The locking device is engaged.

[0106] Reference Figure 4 As an optional embodiment, a locking device exit control process in a control method for a guide vane servo locking device of a large hydro-generator set includes the following steps:

[0107] S0: Start the lock exit control process;

[0108] S1: Determine whether the local / remote switching handle of the hydraulic system is in the local control mode. If yes, execute S2; otherwise, execute S8.

[0109] S2: Determine whether the lock spindle exit button SB11 of the speed regulator control cabinet is actuated. If so, execute S3; otherwise, execute S5.

[0110] S3: Determine whether the lock exit button delay time △t3 has expired. If so, execute S14; otherwise, execute S4.

[0111] S4: Continue to hold the governor control cabinet locked and the exit button;

[0112] S5: Determine whether the lock exit button SB11 of the speed regulator control cabinet is activated. If so, execute S6; otherwise, execute S7.

[0113] S6: Execute the lock input control process;

[0114] S7: The speed regulator control cabinet lock exit manual operation is not executed;

[0115] S8: Determine whether the local / remote switching handle of the hydraulic system is in the remote position. If yes, execute S9;

[0116] S9: Determine whether the local cabinet of the local control unit of the unit outputs a lock exit command, that is, whether the K2 relay is energized. If yes, execute S14; otherwise, execute S10.

[0117] S10: Determine whether the lock exit button SB13 of the speed regulator electrical cabinet is activated. If so, execute S11; otherwise, execute S12.

[0118] S11: Determine whether the lock exit button delay time △t4 has expired. If so, execute S14; otherwise, execute S13.

[0119] S12: The speed regulator control cabinet lock exit manual operation is not executed;

[0120] S13: Continue to hold the exit button of the speed regulator electrical cabinet locked;

[0121] S14: Lock exit execution condition is met;

[0122] S15: Determine whether the lock exit solenoid valve relay KAUX27 is energized. If so, execute S17; otherwise, execute S16.

[0123] S16: Locking the exit control loop does not meet the conditions;

[0124] S17: The lock exit control loop meets the conditions and executes the lock exit control loop;

[0125] S18: The lock-out solenoid valve is turned on and the lock-in solenoid valve is turned off;

[0126] S21: The locking device exits.

[0127] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A control system for a guide vane servo locking device of a hydro-generator set, characterized by: include, An electrical unit (1), the electrical unit (1) comprising a speed regulator control cabinet (11), a local cabinet (12) of a unit local control unit, and a speed regulator electrical cabinet (13), wherein the speed regulator control cabinet (11), the speed regulator electrical cabinet (13), and the local cabinet (12) of the unit local control unit are connected via an electrical control circuit, and the control priority of the speed regulator control cabinet (11) is higher than that of the speed regulator electrical cabinet (13) and the local cabinet (12) of the unit local control unit, A locking unit (2) includes a locking solenoid valve (21) and a locking device (22). The locking solenoid valve (21) is installed on a control pipeline of the locking device (22) and receives a control signal output by an electrical control circuit. The locking device (22) is connected to the locking solenoid valve (21) and is used to perform locking and unlocking operations.

2. The control system for the guide vane servo locking device of a hydro-generator set according to claim 1, characterized in that: The speed regulator control cabinet (11) is provided with a lock-in button SB10, a lock-out button SB11, a lock-in indicator light HL1, and a lock-out indicator light HL2. The speed regulator control cabinet (11) can be manually operated to lock in and lock out through the lock-in button SB10 and the lock-out button SB11, and a lock position status signal is displayed through the lock-in indicator light HL1 and the lock-out indicator light HL2.

3. The control system for the guide vane servo locking device of a hydro-generator set according to claim 2, characterized in that: The local cabinet (12) of the unit's on-site control unit is internally provided with a PLC controller, which can monitor the system's startup and shutdown processes, output a locking control command according to the startup or shutdown process, and transmit its signal to the electrical control circuit in the speed regulator control cabinet (11).

4. The control system for the guide vane servo locking device of a hydro-generator set according to claim 3, characterized in that: The speed regulator electrical cabinet (13) is provided with a lock-in button SB12, a lock-out button SB13, a lock-in indicator light HL3, and a lock-out indicator light HL4. The lock-in button SB12 and the lock-out button SB13 can be used to manually operate the lock-in and lock-out. The speed regulator electrical cabinet (13) can also receive control commands output by the local cabinet (12) of the local control unit of the unit and display the lock position status signal through the lock-in indicator light HL3 and the lock-out indicator light HL4.

5. The control system for the guide vane servo locking device of a hydro-generator set according to claim 4, characterized in that: The speed regulator control cabinet (11) and the speed regulator electrical cabinet (13) are connected via an electrical control circuit, and the local cabinet (12) of the unit local control unit is directly connected to the speed regulator control cabinet (11) via an independent control cable.

6. The control system for the guide vane servo locking device of a hydro-generator set according to claim 5, characterized in that: The control mode of the locking device (22) includes a semi-automatic control mode and an automatic control mode. The semi-automatic control mode is manually operated through a speed regulator control cabinet (11) or a speed regulator electrical cabinet (13), and the automatic control mode is automatically executed through a PLC controller of a local cabinet (12) of a local control unit of the unit.

7. The control system for the guide vane servo locking device of a hydro-generator set according to claim 6, characterized in that: The local / remote switching handle SW1 of the hydraulic system in the electrical control circuit needs to adopt a pair of normally open and normally closed nodes, and the normally closed resets when the normally open action is performed, so as to ensure that the local / remote switching mode of the hydraulic system has only one mode valid, and the locking operation of the locking device (22) can only be performed when the guide vane is in the fully closed position, and the locking exit operation does not require the locking guide vane fully closed signal.

8. The control system for the guide vane servo locking device of a hydro-generator set according to claim 1, characterized in that: The locking solenoid valve (21) is installed on the control oil pipeline of the relay locking device in the waterwheel chamber. The locking solenoid valve (21) is set on the pipeline in the waterwheel chamber close to the locking device (22). Diodes D25 and D26 are respectively connected to the control circuits of the locking input solenoid valve SDTR and the locking exit solenoid valve SDTC in the locking solenoid valve (21) to protect the components in the control circuit from damage.

9. A method for operating a control system for a guide vane servomotor locking device of a hydro-turbine generator set, comprising the control system for a guide vane servomotor locking device of a hydro-turbine generator set according to any one of claims 1 to 8, and: The locking device activation control process includes the following steps: S0: Start the lock input control process; S1: Determine whether the local / remote switching handle of the hydraulic system is in the local control mode. If yes, execute S2; otherwise, execute S8. S2: Determine whether the spindle lock input button SB10 of the speed regulator control cabinet is actuated. If so, execute S3; otherwise, execute S5. S3: Determine whether the lock input button delay time △t1 has expired. If so, execute S14; otherwise, execute S4. S4: Continue to lock the input button of the speed regulator control cabinet; S5: Determine whether the lock exit button SB11 of the speed regulator control cabinet is activated. If so, execute S6; otherwise, execute S7. S6: Execute the lock exit control process; S7: The speed regulator control cabinet is locked and put into manual operation but not executed; S8: Determine whether the local / remote switching handle of the hydraulic system is in the remote position. If yes, execute S9; S9: Determine whether the local cabinet of the unit's local control unit outputs a lock-in command, that is, whether the K1 relay is energized. If so, execute S14; otherwise, execute S10. S10: Determine whether the lock-in button SB12 of the speed regulator electrical cabinet is activated. If so, execute S11; otherwise, execute S12. S11: Determine whether the lock input button delay time △t2 has expired. If so, execute S14; otherwise, execute S13. S12: The speed regulator control cabinet is locked and put into manual operation but not executed; S13: Continue to lock the input button of the speed regulator electrical cabinet; S14: Determine whether the guide vane is in the fully closed position, that is, whether the KAUX10 relay in the fully closed position is energized. If so, execute S15; otherwise, execute S16. S15: Locking input execution conditions are met; S16: Locking input execution conditions are not met; S17: Determine whether the locking electromagnetic valve relay KAUX26 is energized. If so, execute S19; otherwise, execute S18. S18: The lock input control loop does not meet the conditions; S19: The locking input control loop meets the conditions and executes the locking input control loop; S20: The lock-in solenoid valve is turned on and the lock-out solenoid valve is turned off; S21: The locking device is engaged.

10. The method for operating a control system for a guide vane servomotor locking device of a hydro-generator set according to claim 9, characterized in that: The locking device exit control process includes the following steps: S0: Start the lock exit control process; S1: Determine whether the local / remote switching handle of the hydraulic system is in the local control mode. If yes, execute S2; otherwise, execute S8. S2: Determine whether the lock spindle exit button SB11 of the speed regulator control cabinet is actuated. If so, execute S3; otherwise, execute S5. S3: Determine whether the lock exit button delay time △t3 has expired. If so, execute S14; otherwise, execute S4. S4: Continue to hold the governor control cabinet locked and the exit button; S5: Determine whether the lock exit button SB11 of the speed regulator control cabinet is activated. If so, execute S6; otherwise, execute S7. S6: Execute the lock input control process; S7: The speed regulator control cabinet lock exit manual operation is not executed; S8: Determine whether the local / remote switching handle of the hydraulic system is in the remote position. If yes, execute S9; S9: Determine whether the local cabinet of the local control unit of the unit outputs a lock exit command, that is, whether the K2 relay is energized. If yes, execute S14; otherwise, execute S10. S10: Determine whether the lock exit button SB13 of the speed regulator electrical cabinet is activated. If so, execute S11; otherwise, execute S12. S11: Determine whether the lock exit button delay time △t4 has expired. If so, execute S14; otherwise, execute S13. S12: The speed regulator control cabinet lock exit manual operation is not executed; S13: Continue to hold the governor electrical cabinet locked and the exit button; S14: Lock exit execution condition is met; S15: Determine whether the lock exit solenoid valve relay KAUX27 is energized. If so, execute S17; otherwise, execute S16. S16: The lock exit control loop does not meet the conditions; S17: The lock exit control loop meets the conditions and executes the lock exit control loop; S18: The lock-out solenoid valve is turned on and the lock-in solenoid valve is turned off; S21: The locking device exits.

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