Automatic following control method for cylindrical valve of water turbine

Abstract

The invention discloses an automatic following control method for a cylindrical valve of a water turbine, which belongs to the technical field of automatic control and comprises the following steps: when an integrated digital quantization hydraulic execution unit electrical servo mechanism in a control system of the cylindrical valve of the water turbine fails, the control system of the cylindrical valve of the water turbine is in a debugging mode; by setting parameters and manually operating a certain integrated digital quantization hydraulic execution unit, follow-up movement of other integrated digital quantization hydraulic execution units is realized. According to the invention, an electrical output execution element of the cylindrical valve control system can still be opened or closed when a fault exists, the influence of the cylindrical valve system on the work of a generator set is reduced, and the working efficiency of the generator set is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of water inlet valve control of a hydro-turbine generator set, and in particular to an automatic following control method for a hydro-turbine cylindrical valve. Background Art

[0002] The electrical servo mechanism of the turbine cylinder valve control system is the core component of the integrated digital quantized hydraulic actuator control input. It realizes the opening, closing and synchronous control of the cylinder through electrical position control and synchronous control. As an important part of the turbine cylinder valve control system, the stability and fault tolerance of the electrical servo mechanism directly affect the working efficiency of the system. In the conventional control strategy, when any electrical servo mechanism fails, the turbine cylinder valve control system will not be able to continue to work. The cylinder valve can only be opened or closed after the fault is restored, which seriously affects the production and maintenance of the power station. Summary of the invention

[0003] The present invention aims to solve the deficiencies of conventional control strategies of turbine cylinder valve control systems in the prior art, and proposes an automatic following control method for turbine cylinder valves to maximize the operation of the cylinder valve system and improve the stability of the cylinder valve system.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is as follows: A method for automatically following and controlling a cylinder valve of a water turbine comprises the following steps: Step a, determining whether the integrated digital quantized hydraulic actuator electrical servo mechanism in the turbine cylinder valve control system fails, if so, the control system switches to a debugging mode and stops the movement of the current cylinder valve; Step b, the control system automatically counts the number of faults of the current electrical servo mechanism. If the number of faults of the electrical servo mechanism is equal to 1 and the automatic follow-up control enable is true, the control system automatically records the current fault position of the electrical servo mechanism and proceeds to step c; Step c, obtaining the absolute value of the difference between the position of the electrical servo mechanism servo in a non-fault state and the position of the electrical servo mechanism servo in a current fault state, and if the absolute value is greater than or equal to the automatic following motion control dead zone, entering the automatic following procedure of step d; Step d, after entering the automatic following program, manually operate to rotate the integrated digital quantized hydraulic actuator unit to drive the corresponding electrical servo mechanism in a fault state to move the relay, and other integrated digital quantized hydraulic actuator units follow the movement; Step e: monitor the position of the cylindrical valve in real time during the movement. If the absolute value of the difference between the non-fault state electrical servo mechanism servo position and the current fault state electrical servo mechanism servo position is less than the automatic following motion control dead zone, the non-fault state electrical servo mechanism stops running and enters step c; if the cylindrical valve position reaches fully open or fully closed, the automatic following process exits.

[0005] Furthermore, in the debugging mode, the secondary fault light is turned on and an alarm is sent to the monitoring system.

[0006] Furthermore, step b also includes: if the number of faults of the electrical servo mechanism is greater than 1, the control system exits the debugging mode, enters the cut-off mode, stops the movement of the current cylindrical valve, and turns off the electrical servo mechanism enable. At the same time, the secondary fault light goes out, the serious fault indicator light is turned on, and an alarm is sent to the monitoring system.

[0007] Furthermore, step b also includes: if the fault number of the electrical servo mechanism is equal to 1 and the automatic follow-up control enable is false, the control system exits the debugging mode, enters the cut-off mode, stops the movement of the current cylindrical valve, and turns off the electrical servo mechanism enable. At the same time, the secondary fault light goes out, the serious fault indicator light is turned on, and an alarm is sent to the monitoring system.

[0008] Furthermore, in step d, if the cylindrical valve is stuck or has other serious faults, it will automatically exit the process, the secondary fault indicator light will go out, the serious fault indicator light will light up, and the control system will send an alarm to the monitoring system.

[0009] Furthermore, in step d, the current electrical given position of the non-faulty electrical servo mechanism is assigned as the servomotor position of the faulty electrical servo mechanism. After the assignment is completed, the non-faulty electrical servo mechanism drives the servomotor to move to the servomotor position of the faulty electrical servo mechanism.

[0010] Furthermore, after the electrical servo mechanism of the integrated digital quantized hydraulic actuator unit recovers from a fault, the system returns to normal and exits the automatic following program by pressing a fault recovery button of the access control system.

[0011] Furthermore, it also includes: when other operation controls are performed under the automatic following program, the automatic following enable is assigned a value of False, and the automatic following program is exited at the same time. If it is necessary to re-enter the following program, the enabling parameter is reset to True.

[0012] Furthermore, the range of the automatic following motion control dead zone is [1mm ~ 2mm].

[0013] Furthermore, in step d, when the non-fault state electrical servo mechanism drives the servomotor to move to the fault state electrical servomotor servomotor position, the secondary fault light flashes, and if the cylindrical valve position reaches fully open or fully closed, the secondary fault light stops flashing.

[0014] In summary, the present invention has the following advantages: 1. In the automatic following program, the integrated digital quantitative hydraulic actuator unit is manually operated to move, and other actuator units follow the movement, so that when one of the electrical servo mechanisms of the cylindrical valve control system fails, it can still be opened or closed, thereby reducing the influence of the cylindrical valve system on the operation of the unit and effectively improving the working efficiency of the generator set; 2. In the present invention, when there is an electrical servo mechanism fault in the cylindrical valve control system, the control mode of the control system is quickly and automatically adjusted by first determining the number of electrical servo mechanism faults and whether automatic follow-up is enabled, and an alarm is sent to the monitoring system, thereby reducing the operation of operation and maintenance personnel, effectively shortening the fault handling time, and improving the fault handling efficiency; 3. In the present invention, the current state of the cylindrical valve system is effectively indicated by the state change of the indicator light, that is, the secondary fault light is always on when a fault occurs and flashes when the secondary fault light automatically follows the fault, thereby playing a better warning and reminder role; 4. In the present invention, if the cylindrical valve is stuck or other serious faults occur during the movement, the automatic follow-up control mode is designed to automatically exit; if the electrical servo mechanism of the integrated digital quantitative hydraulic actuator unit recovers from the fault, it is designed to exit the automatic follow-up program through the fault reset button; if other operation controls are performed during this period, the automatic follow-up control mode is designed to automatically exit, thereby ensuring the safe operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a flow chart of automatic following control of a turbine cylindrical valve according to the present invention. DETAILED DESCRIPTION

[0016] In order to explain the present invention more clearly, the present invention is further described below in conjunction with preferred embodiments and drawings. It should be understood by those skilled in the art that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the present invention.

[0017] The present invention provides an automatic following control method for a turbine cylinder valve, which can enable the turbine cylinder valve control system to achieve the following movement of other integrated digital quantized hydraulic actuator units by setting parameters and manually operating a certain integrated digital quantized hydraulic actuator unit in a debugging mode, so as to achieve the purpose of emergency opening or closing control of the cylinder valve under special working conditions.

[0018] like Figure 1 As shown, the steps of automatic following control of the water turbine cylindrical valve of the present invention are as follows: Step 1: When the electrical servo mechanism of the integrated digital quantized hydraulic actuator unit in the turbine cylinder valve control system fails, the control system switches to the debugging mode, lights up the secondary fault light and sends a corresponding alarm to the monitoring system, and then enters step 2.

[0019] It should be noted that, in this embodiment, the control system of the water turbine cylinder valve is divided into four modes: automatic, manual, cut-off, and debugging. The normal working state is the automatic or manual mode. After entering the debugging mode, the movement of the current cylinder valve is stopped. After entering the cut-off mode, the movement of the current cylinder valve is stopped, and the electrical servo mechanism is turned off.

[0020] Step 2: The turbine cylinder valve control system automatically counts the current number of electrical servo mechanism faults nDRVErr_QTY and determines: If the number of electrical servo mechanism faults nDRVErr_QTY is greater than 1, the control system exits the debugging mode and enters the removal mode, the secondary fault indicator goes out, the serious fault indicator lights up, and the control system sends an alarm to the monitoring system; If the number of electrical servo mechanism faults nDRVErr_QTY is equal to 1 and the automatic follow-up control enable is false, that is, bDEB_FLEN=False, the control system exits the debugging mode and enters the removal mode, the secondary fault indicator goes out, the serious fault indicator lights up, and the control system sends an alarm to the monitoring system; If the electrical servo mechanism fault number nDRVErr_QTY is equal to 1 and the automatic follow-up control enable is true, that is, bTRDEB_ENFL=True, the system automatically records the current electrical servo mechanism fault position number nDEB_FLNM, and then enters step three.

[0021] Step 3: Analyze the current position of all cylindrical valve servomotors rPos_Cur 1。。。 rPos_Cur n , using the non-fault state electrical servo mechanism servo position rPos_Cur 1。。。 rPos_Cur n The relay position rPos_Cur of the current fault state electrical servo mechanism position number nDEB_FLNM nDEB_FLNM Make the difference and take the absolute value, i.e. rPos_Dev n =ABS(rPos_Cur nDEB_FLNM -rPos_Cur n ); if ABS(rPos_Cur nDEB_FLNM -rPos_Cur n ) is greater than or equal to the automatic following motion control dead zone rPAR_mm_FLDB, then enter the automatic following procedure in step 4.

[0022] Step 4: After entering the automatic following program, manually operate to rotate the integrated digital quantized hydraulic actuator unit to drive the corresponding electrical servo mechanism to move the relay in the fault state, and other integrated digital quantized hydraulic actuator units follow the movement.

[0023] Specifically, the current electrical servo mechanism electrical given position srABPOS n Assign the value to the relay position rPos_Cur of the current fault state electrical servo mechanism nDEB_FLNM The non-fault state electrical servo mechanism drives the servomotor to move to the servomotor position rPos_Cur of the electrical servomotor fault position number nDEB_FLNM. nDEB_FLNM , the secondary fault light flashes during movement.

[0024] During the movement, the position of the cylindrical valve is monitored in real time. If the ABS (rPos_Cur nDEB_FLNM -rPos_Cur n ) is less than the automatic following motion control dead zone rPAR_mm_FLDB, the non-fault state electrical servo mechanism stops running and enters step three; if the cylindrical valve position reaches fully open or fully closed, the secondary fault light stops flashing and the automatic following process exits.

[0025] Furthermore, under the automatic following procedure, if the cylindrical valve is stuck or has other serious faults, the automatic following process will exit, the secondary fault light will go out, the serious fault indicator light will light up, and the control system will send an alarm to the monitoring system.

[0026] In this embodiment, when the electrical servo mechanism of the integrated digital quantized hydraulic actuator unit recovers from a fault, the system can be restored to normal and the automatic following program can be exited by pressing a fault recovery button of the access control system.

[0027] At the same time, when other operation controls are performed under the automatic following program, the automatic following enable is assigned to False and the automatic following program is exited. If you need to re-enter the following program, reset the enable parameter to True.

[0028] The range of the automatic following motion control dead zone rPAR_mm_FLDB is adjustable. In this embodiment, the range is preferably set to [1mm ~ 2mm].

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for automatic following control of a turbine cylinder valve, characterized in that: The steps include: Step a, determining whether the integrated digital quantized hydraulic actuator electrical servo mechanism in the turbine cylinder valve control system fails, if so, the control system switches to a debugging mode and stops the movement of the current cylinder valve; Step b, the control system automatically counts the number of faults of the current electrical servo mechanism. If the number of faults of the electrical servo mechanism is equal to 1 and the automatic follow-up control enable is true, the control system automatically records the current fault position of the electrical servo mechanism and proceeds to step c; Step c, obtaining the absolute value of the difference between the position of the electrical servo mechanism servo in a non-fault state and the position of the electrical servo mechanism servo in a current fault state, and if the absolute value is greater than or equal to the automatic following motion control dead zone, entering the automatic following procedure of step d; Step d, after entering the automatic following program, manually operate to rotate the integrated digital quantized hydraulic actuator unit to drive the corresponding electrical servo mechanism in a fault state to move the relay, and other integrated digital quantized hydraulic actuator units follow the movement; Step e: monitor the position of the cylindrical valve in real time during the movement. If the absolute value of the difference between the non-fault state electrical servo mechanism servo position and the current fault state electrical servo mechanism servo position is less than the automatic following motion control dead zone, the non-fault state electrical servo mechanism stops running and enters step c; if the cylindrical valve position reaches fully open or fully closed, the automatic following process exits.

2. The method for automatic following control of a water turbine cylinder valve according to claim 1, characterized in that: In debugging mode, the secondary fault light is lit and an alarm is sent to the monitoring system.

3. The method for automatic following control of a water turbine cylinder valve according to claim 2, characterized in that: Step b also includes: if the number of faults of the electrical servo mechanism is greater than 1, the control system exits the debugging mode and enters the cut-off mode, stops the movement of the current cylindrical valve, and turns off the electrical servo mechanism enable. At the same time, the secondary fault light goes out, the serious fault indicator light is turned on, and an alarm is sent to the monitoring system.

4. The method for automatic following control of a water turbine cylinder valve according to claim 2, characterized in that: Step b also includes: if the fault number of the electrical servo mechanism is equal to 1 and the automatic follow-up control enable is false, the control system exits the debugging mode, enters the cut-off mode, stops the movement of the current cylindrical valve, and turns off the electrical servo mechanism enable. At the same time, the secondary fault light goes out, the serious fault indicator light is turned on, and an alarm is sent to the monitoring system.

5. The method for automatic following control of a water turbine cylinder valve according to claim 1, characterized in that: In step d, if the cylindrical valve is stuck or has other serious faults, it will automatically exit the process, the secondary fault indicator light will go out, the serious fault indicator light will light up, and the control system will send an alarm to the monitoring system.

6. The method for automatic following control of a water turbine cylinder valve according to claim 1, characterized in that: In step d, the current electrical given position of the non-faulty electrical servo mechanism is assigned to the servomotor position of the faulty electrical servo mechanism. After the assignment is completed, the non-faulty electrical servo mechanism drives the servomotor to move to the servomotor position of the faulty electrical servo mechanism.

7. The method for automatic following control of a water turbine cylinder valve according to claim 1, characterized in that: When the electrical servo mechanism of the integrated digital quantized hydraulic actuator unit recovers from the fault, it returns to normal and exits the automatic following program by pressing the fault recovery button of the access control system.

8. The method for automatic following control of a water turbine cylinder valve according to claim 1, characterized in that: Also includes: When performing other operation controls under the automatic following program, the automatic following enable is assigned a value of False and the automatic following program is exited. If you need to re-enter the following program, reset the enable parameter to True.

9. The method for automatic following control of a water turbine cylinder valve according to claim 1, characterized in that: The range of the automatic following motion control dead zone is [1mm ~ 2mm].

10. The method for automatic following control of a water turbine cylinder valve according to claim 1, characterized in that: In step d, when the non-fault state electrical servo mechanism drives the servomotor to move to the fault state electrical servo mechanism servomotor position, the secondary fault light flashes. If the cylindrical valve position reaches fully open or fully closed, the secondary fault light stops flashing.

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