Jamming phenomenon judgment method and device for cylindrical valve and proportional valve of water turbine, medium and product

Abstract

The invention discloses a water turbine cylindrical valve proportional valve jamming phenomenon judgment method and device, a medium and a product, and relates to the technical field of water turbine generator set control. Whether the proportional valve is jammed or not can be automatically judged according to the instruction sent to the proportional valve by the PLC and the displacement feedback signal of the valve element of the proportional valve, the fault judgment difficulty of personnel is reduced, a judgment result is provided for equipment operation and maintenance, and the equipment fault processing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydro-generator set control, and in particular to a method, device, medium and product for judging the blocking phenomenon of a hydro-turbine cylindrical valve and proportional valve. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] The cylinder valve of a hydroelectric unit is a circular gate valve installed between the fixed and movable guide vanes of a turbine. In the event of an accident such as an overspeed runaway or guide vane loss of control, the turbine can be shut down by closing the cylinder valve using dynamic water flow to prevent the accident. After the guide vanes are closed during normal shutdown, the cylinder valve can be closed using static water flow, significantly reducing water loss and startup and shutdown time while minimizing runner cavitation and sediment wear caused by guide vane leakage. Currently, turbine cylinder valves mostly use multiple straight-cylinder servos (typically six servos). During the opening and closing process, the synchronization of the servo displacements must be strictly ensured to prevent mechanical jamming caused by cylinder deflection. There are two main solutions used in the industry to achieve synchronous control of turbine cylinder valve relays: one is the digital cylinder type, which directly realizes the synchronization of multiple relays through the digital cylinder; the other is the synchronous hydraulic motor + proportional valve structure, in which the synchronous hydraulic motor realizes the even distribution of the flow of multiple relays, and the proportional valve realizes higher-precision synchronization, that is, the synchronous hydraulic motor realizes coarse adjustment, and the proportional valve realizes fine adjustment, which work together to realize the synchronous control of the relay.

[0004] Existing cylindrical valve control systems, which utilize a synchronous hydraulic motor and proportional valve hydraulic structure, typically use servomotor displacement as feedback, adjusting the proportional valve based on the displacement difference. However, there is no real-time method for determining whether the proportional valve is stuck or tracking speed is normal. Most problems with stuck valves require on-site testing by maintenance personnel. In severe cases, this can prevent the unit from starting up and connecting to the grid as planned, impacting the safe and stable operation of the power grid. Summary of the Invention

[0005] The purpose of the present invention is to: in response to the problems existing in the prior art, provide a method, device, medium and product for judging the stuck phenomenon of a turbine cylindrical valve proportional valve, which can automatically judge whether the proportional valve has a stuck phenomenon based on the instructions issued by the programmable controller (PLC) to the proportional valve and the feedback signal of the proportional valve valve core displacement, reduce the difficulty of fault judgment for personnel, provide judgment results for equipment operation and maintenance, and improve the efficiency of equipment fault handling.

[0006] The technical solutions of the present invention are as follows:

[0007] The present invention provides a method for determining the sticking phenomenon of a proportional valve of a hydraulic turbine cylinder valve, comprising:

[0008] Step S1: Obtain the control instructions of each proportional valve in real time and perform normalization processing;

[0009] Step S2: acquiring the spool position of each proportional valve in real time and performing normalization processing;

[0010] Step S3: determining the availability of the spool position signal of each proportional valve in real time;

[0011] Step S4: determining whether the proportional valve is stuck based on the monitored control instructions of each proportional valve, the position of each proportional valve spool, and the availability of each proportional valve spool position signal;

[0012] Step S5: Determine whether the blocking phenomenon exists for m consecutive cycles;

[0013] Step S6: If the condition of step S5 is met, it is finally determined that the proportional valve is blocked; otherwise, no blocking occurs.

[0014] Furthermore, the control instructions of each proportional valve after per unit are expressed as follows:

[0015] V_C_1, V_C_2, V_C_3,...V_C_i,...V_C_n

[0016] in:

[0017] V_C_i represents the control instruction corresponding to proportional valve No. i.

[0018] Furthermore, the spool position of each proportional valve after per-unit calibration is expressed as:

[0019] V_P_1, V_P_2, V_P_3,...V_P_i,...V_P_n

[0020] in:

[0021] V_P_i represents the valve core position corresponding to proportional valve No. i.

[0022] Furthermore, the availability of the spool position signal of each proportional valve is expressed as:

[0023] V_P_U_1, V_P_U_2, V_P_U_3,...V_P_U_i,...V_P_U_n

[0024] in:

[0025] V_P_U_i indicates the availability of the valve core position signal corresponding to proportional valve No. i; V_P_U_i=1 indicates that the valve core position signal corresponding to proportional valve No. i is available.

[0026] Furthermore, the step S4 includes:

[0027] Step S41: If the valve core position signal corresponding to proportional valve No. i is available, that is, if V_P_U_i=1, proceed to the next step;

[0028] Step S42: Calculate the absolute value of the difference between the control instruction V_C_i corresponding to proportional valve No. i and the valve core position V_P_i corresponding to proportional valve No. i;

[0029] Step S43: Compare the value calculated in step S42 with the threshold value V_critical_value, and determine whether the proportional valve is stuck based on the comparison result.

[0030] Furthermore, the step S43 includes:

[0031] |V_C_i-V_P_i|>V_critical_value

[0032] If the above formula is satisfied, it is determined that the proportional valve is stuck, otherwise it does not exist.

[0033] Furthermore, the threshold V_critical_value is a threshold of a difference between a proportional valve control instruction and a proportional valve position signal, which can be obtained through experiments or product manuals.

[0034] The present invention also provides a computing device, comprising:

[0035] At least one processor; and a memory in communication with the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for determining the stuck phenomenon of a proportional valve of a turbine cylinder valve as described above.

[0036] The present invention also provides a computer terminal storage medium storing computer terminal executable instructions, wherein the computer terminal executable instructions are used to execute the above-mentioned method for determining the sticking phenomenon of a turbine cylindrical valve and proportional valve.

[0037] The present invention also provides a computer program product, which, when executed by a processor, implements the above-mentioned method for determining the sticking phenomenon of a proportional valve of a hydraulic turbine cylindrical valve.

[0038] Compared with the existing technology, the beneficial effects of the present invention are:

[0039] 1. The present invention provides a method for judging whether a proportional valve of a turbine cylinder valve is stuck based on a programmable controller. The method can judge whether the proportional valve is stuck by monitoring the proportional valve control instructions and the position of the proportional valve spool in real time, thereby detecting abnormal status of the proportional valve before its performance is completely degraded, thereby improving the level of equipment operation status monitoring.

[0040] 2. The present invention provides a method for judging whether a proportional valve of a turbine cylinder valve is stuck based on a programmable controller. The method can judge whether the proportional valve is stuck by real-time monitoring of the proportional valve control instructions and the position of the proportional valve spool, and provide a proportional valve stuck alarm signal to help the operation and maintenance personnel of the hydropower station quickly determine the fault point and take corresponding measures, thereby improving the operation and maintenance efficiency and ensuring the safe and stable operation of the unit.

[0041] 3. The present invention provides a method for judging the sticking of a turbine cylinder valve proportional valve based on a programmable controller. The method is integrated into the cylinder valve control system PLC and can be implemented without the need for additional equipment. It has the advantages of real-time convenience and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a flowchart of the real-time data acquisition process for the proportional valve;

[0043] Figure 2 This is a flowchart of the method for determining whether the n# proportional valve is stuck. DETAILED DESCRIPTION

[0044] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus comprising the element.

[0045] The features and performance of the present invention are further described in detail below with reference to the embodiments.

[0046] Example 1

[0047] The present invention provides a method for determining the sticking phenomenon of a proportional valve of a hydraulic turbine cylinder valve, comprising:

[0048] Step S1: Acquire the control instructions of each proportional valve in real time and perform normalization processing;

[0049] Step S2: acquiring the spool position of each proportional valve in real time and performing normalization processing;

[0050] Step S3: Determine the availability of the spool position signal of each proportional valve in real time; if unavailable, issue an alarm; if available, proceed to step S4;

[0051] Step S4: determining whether the proportional valve is stuck based on the monitored control instructions of each proportional valve, the position of each proportional valve spool, and the availability of each proportional valve spool position signal;

[0052] Step S5: Determine whether the blocking phenomenon exists for m consecutive cycles;

[0053] Step S6: If the condition of step S5 is met, it is finally determined that the proportional valve is blocked; otherwise, no blocking occurs.

[0054] In this embodiment, specifically, the proportional valve control instructions after per unit are expressed as follows:

[0055] V_C_1, V_C_2, V_C_3,...V_C_i,...V_C_n

[0056] in:

[0057] V_C_i represents the control instruction corresponding to proportional valve No. i.

[0058] In this embodiment, specifically, the spool positions of the proportional valves after per unit are expressed as:

[0059] V_P_1, V_P_2, V_P_3,...V_P_i,...V_P_n

[0060] in:

[0061] V_P_i represents the valve core position corresponding to proportional valve No. i.

[0062] In this embodiment, specifically, the availability of the spool position signal of each proportional valve is expressed as:

[0063] V_P_U_1, V_P_U_2, V_P_U_3,...V_P_U_i,...V_P_U_n

[0064] in:

[0065] V_P_U_i indicates the availability of the valve core position signal corresponding to proportional valve No. i; V_P_U_i=1 indicates that the valve core position signal corresponding to proportional valve No. i is available.

[0066] In this embodiment, specifically, step S4 includes:

[0067] Step S41: If the valve core position signal corresponding to proportional valve No. i is available, that is, if V_P_U_i=1, proceed to the next step;

[0068] Step S42: Calculate the absolute value of the difference between the control instruction V_C_i corresponding to proportional valve No. i and the valve core position V_P_i corresponding to proportional valve No. i;

[0069] Step S43: Compare the value calculated in step S42 with the threshold value V_critical_value, and determine whether the proportional valve is stuck based on the comparison result.

[0070] In this embodiment, specifically, step S43 includes:

[0071] |V_C_i-V_P_i|>V_critical_value

[0072] If the above formula is satisfied, it is determined that the proportional valve is stuck, otherwise it does not exist.

[0073] In this embodiment, specifically, the threshold value V_critical_value is a threshold value of a difference between a proportional valve control instruction and a proportional valve position signal, which can be obtained through experiments or product manuals.

[0074] Example 2

[0075] This embodiment, based on the method for determining the stuck phenomenon of a proportional valve of a hydraulic turbine cylinder valve proposed in the first embodiment, further proposes a system for determining the stuck phenomenon of a proportional valve of a hydraulic turbine cylinder valve, comprising:

[0076] Proportional valve control command detection module, proportional valve spool displacement monitoring module, proportional valve jam judgment module;

[0077] The proportional valve control instruction detection module, the proportional valve spool displacement monitoring module, the proportional valve blocking judgment module and the alarm module are all placed inside the programmable controller of the cylindrical valve control system.

[0078] See also Figure 1 and Figure 2 Based on the above system, the method for judging the sticking phenomenon of the turbine cylinder valve proportional valve includes the following steps:

[0079] (1) The proportional valve control command detection module inside the cylindrical valve control system reads the proportional valve control commands of each relay in real time and performs per-unit calibration: V_C_1, V_C_2, V_C_3, ... V_C_n; where V_C_1 represents the control command of proportional valve #1, V_C_n represents the control command of proportional valve #n; V_C_n is the real-time control command of proportional valve #n, and the per-unit value is -100% to +100%, where -100% corresponds to the fully closed command, 0% corresponds to the neutral command, and +100% corresponds to the fully open command;

[0080] (2) The proportional valve spool displacement feedback module inside the cylindrical valve control system obtains the position of each proportional valve spool in real time and performs per-unit calibration: V_P_1, V_P_2, V_P_3, ... V_P_n, where V_P_1 represents the position of the spool of proportional valve #1, V_P_n represents the position of the spool of proportional valve #n; V_P_n represents the position of the spool of proportional valve #n, and the per-unit value is -100% to +100%, where -100% corresponds to the fully closed position, 0% corresponds to the neutral position, and +100% corresponds to the fully open position;

[0081] (3) The proportional valve spool displacement feedback module inside the cylindrical valve control system determines the availability of the spool position signals of each proportional valve in real time: V_P_U_1, V_P_U_2, V_P_U_3...V_P_U_n; when V_P_U_1 is 1, it indicates that the spool position signal of the 1# proportional valve is available; when V_P_U_n is 1, it indicates that the spool position signal of the n# proportional valve is available, otherwise it is unavailable;

[0082] (4) The proportional valve blocking judgment module inside the cylindrical valve control system judges whether the proportional valve is blocked based on the proportional valve command, proportional valve spool position and proportional valve spool position signal availability monitored by the "proportional valve control command detection module" and the "proportional valve spool displacement monitoring module". Take the n# servo proportional valve as an example:

[0083] ① The spool position signal of the n# proportional valve is available, that is, if V_P_U_n=1, proceed to the next step;

[0084] ② Calculate the absolute value of the difference between the n# proportional valve control command and the proportional valve position and compare it with the threshold V_critical_value;

[0085] |V_C_n-V_P_n|>V_critical_value

[0086] Where:

[0087] V_C_n is the control instruction of n# proportional valve;

[0088] V_P_n is the spool position of the n# proportional valve;

[0089] V_critical_value is the threshold of the difference between the proportional valve control command and the proportional valve position signal, which can be obtained through testing or product manuals. V_critical_value is the threshold for determining sticking resistance, and engineering experience generally shows it to be 10-20%.

[0090] (5) When m consecutive cycles satisfy Formula 1 (m can be set to an integer greater than or equal to 1), the judgment module automatically determines that there is a stuck fault in the proportional valve spool and issues an n# proportional valve stuck alarm signal; otherwise, it is considered that there is no stuck phenomenon in the proportional valve spool; m is the number of consecutive cycles, and engineering experience is generally 10-20.

[0091] Example 3

[0092] This embodiment further provides a computing device, including:

[0093] At least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the above-mentioned method for determining the stuck phenomenon of a proportional valve of a turbine cylinder valve; examples of computing devices include a PC, a tablet computer, a smart phone, or a PDA, etc.

[0094] Example 4

[0095] This embodiment further provides a computer terminal storage medium storing computer terminal executable instructions, wherein the computer terminal executable instructions are used to execute the above-mentioned method for determining the sticking phenomenon of a proportional valve of a hydraulic turbine cylindrical valve.

[0096] The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.

[0097] The computer-readable storage medium may include a data signal propagated in baseband or as part of a carrier wave, wherein the readable program code is carried. The data signal propagated may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The readable storage medium may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, device, or component. The program code contained on the readable storage medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination thereof.

[0098] The program code for performing the operations of the present invention may be written in any combination of one or more programming languages, including object-oriented programming languages such as Java, C++, and the like, as well as conventional procedural programming languages such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a stand-alone software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving a remote computing device, the remote computing device may be connected to the user computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0099] Example 5

[0100] This embodiment further provides a computer program product, which, when executed by a processor, implements the above-mentioned method for determining the stuck phenomenon of a proportional valve of a hydraulic turbine cylindrical valve.

[0101] The above-described embodiments merely represent specific implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection of the present application. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the technical concept of the present application, and all such variations and improvements fall within the scope of protection of the present application.

[0102] This background section is provided to generally present the context of the invention, and the work of the presently named inventors, the work to the extent described in this background section, and aspects of the description in this section that did not constitute prior art at the time of filing are neither explicitly nor implicitly admitted to be prior art to the present invention.

Claims

1. A method for determining the sticking phenomenon of a proportional valve of a hydraulic turbine cylinder valve, characterized in that: include: Step S1: Acquire the control instructions of each proportional valve in real time and perform normalization processing; Step S2: acquiring the spool position of each proportional valve in real time and performing normalization processing; Step S3: determining the availability of the spool position signal of each proportional valve in real time; Step S4: determining whether the proportional valve is stuck based on the monitored control instructions of each proportional valve, the position of each proportional valve spool, and the availability of each proportional valve spool position signal; Step S5: Determine whether the blocking phenomenon exists for m consecutive cycles; Step S6: If the condition of step S5 is met, it is finally determined that the proportional valve is blocked; otherwise, no blocking occurs.

2. The method for determining the sticking phenomenon of a hydraulic turbine cylindrical valve proportional valve according to claim 1, characterized in that: The control instructions of each proportional valve after per unit are expressed as follows: V_C_1, V_C_2, V_C_3,...V_C_i,...V_C_n in: V_C_i represents the control instruction corresponding to proportional valve No. i.

3. The method for determining the sticking phenomenon of a proportional valve of a hydraulic turbine cylinder valve according to claim 2, characterized in that: The spool positions of the proportional valves after per-unit calibration are expressed as: V_P_1, V_P_2, V_P_3,...V_P_i,...V_P_n in: V_P_i represents the valve core position corresponding to proportional valve No. i.

4. The method for determining the sticking phenomenon of a proportional valve of a hydraulic turbine cylinder valve according to claim 3, characterized in that: The availability of the spool position signal for each proportional valve is expressed as: V_P_U_1, V_P_U_2, V_P_U_3,...V_P_U_i,...V_P_U_n in: V_P_U_i indicates the availability of the valve core position signal corresponding to proportional valve No. i; V_P_U_i=1 indicates that the valve core position signal corresponding to proportional valve No. i is available.

5. The method for determining the sticking phenomenon of a proportional valve of a hydraulic turbine cylinder valve according to claim 1, characterized in that: The step S4 comprises: Step S41: If the valve core position signal corresponding to proportional valve No. i is available, that is, if V_P_U_i=1, proceed to the next step; Step S42: Calculate the absolute value of the difference between the control instruction V_C_i corresponding to proportional valve No. i and the valve core position V_P_i corresponding to proportional valve No. i; Step S43: Compare the value calculated in step S42 with the threshold value V_critical_value, and determine whether the proportional valve is stuck based on the comparison result.

6. The method for determining the sticking phenomenon of a proportional valve of a hydraulic turbine cylinder valve according to claim 5, characterized in that: The step S43 includes: |V_C_i-V_P_i|>V_critical_value If the above formula is satisfied, it is determined that the proportional valve is stuck, otherwise it does not exist.

7. The method for determining the sticking phenomenon of a proportional valve of a hydraulic turbine cylinder valve according to claim 5, characterized in that: The threshold value V_critical_value is a threshold value of a difference between a proportional valve control instruction and a proportional valve position signal, and can be obtained through experiments or product manuals.

8. A computing device, characterized in that: include: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method for determining the stuck phenomenon of a turbine cylindrical valve proportional valve as described in any one of claims 1 to 7.

9. A computer terminal storage medium storing computer terminal executable instructions, characterized in that: The computer terminal executable instructions are used to execute the method for determining the sticking phenomenon of a turbine cylindrical valve and proportional valve according to any one of claims 1 to 7.

10. A computer program product, characterized in that When the computer program is executed by a processor, the method for determining the sticking phenomenon of a proportional valve of a water turbine cylindrical valve according to any one of claims 1 to 7 is implemented.

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