Water turbine governor guide vane and paddle feedback disconnection locking method and system

Abstract

The invention relates to a hydraulic turbine governor guide vane and paddle feedback disconnection locking method and system, and the method comprises the following steps: taking a relation between a feedback signal and an output signal of a hydraulic turbine governor guide vane and paddle as a judgment basis for feedback disconnection fault state analysis; according to a judgment basis of feedback disconnection fault state analysis, modifying a guide vane and paddle control program of the water turbine governor, and setting a criterion of water turbine governor control program feedback disconnection; a feedback disconnection relay is additionally arranged on each of power supply loops of a guide vane and a paddle proportional valve of the water turbine governor; when the speed regulator control program judges that the guide vane and the paddle are subjected to feedback disconnection according to the criterion of feedback disconnection, the control program sends out an instruction for enabling the feedback disconnection relay to be powered off, an operation power supply of the proportional valve is rapidly cut off, and control voltage is cleared; and enabling the electric control of the guide vane and paddle proportional valve of the water turbine governor to fail, and keeping the current opening of the proportional valve unchanged until the feedback broken line is recovered.

Description

Technical Field

[0001] The present application relates to the technical field of pile foundation construction quality detection, and more specifically, to a method and system for locking the feedback disconnection of guide vanes and blades of a turbine governor. Background Art

[0002] The existing turbine speed governor guide vane and blade feedback disconnection is achieved by relying on a program, that is, when the turbine speed control system feedback is disconnected, the driving voltage of the proportional valve is cleared, but the control voltage of the proportional valve drive board has an electrical delay. When the control voltage is 0, the relay will still crawl a distance toward the shutdown side or the startup side. When there is a feedback disconnection, the relay action amplitude is too large, causing the unit to shed load or overload, which does not meet the fault protection and fault tolerance function requirements of the electro-hydraulic control device in the specifications and standards. When the turbine speed governor guide vane and blade feedback signals appear, the unit is in the grid-connected power generation state, and the relay stroke should maintain the current position unchanged to maintain the current load carried by the unit.

[0003] Prior art, such as the Chinese patent with patent number "CN103452746A", discloses a method for diagnosing and controlling a turbine governor out-of-control signal. The method includes the following steps: the diagnostic method is mainly based on the electrical feedback signal collected by the turbine governor measuring element. When the governor receives a command to open or close the guide vane, its control output, that is, the target value that the guide vane needs to reach and the actual guide vane opening will have a difference, and this difference is greater than the set dead zone value; under normal circumstances, the main pressure regulating valve of the governor will be controlled by the PID operation of the PLC to open a certain opening in the target direction to control the guide vane to move in the target direction; then the PLC program periodically scans and reads whether the guide vane opening moves toward the target, and determines whether the movement rate reaches the requirements of the switch time of the protection calculation. If the guide vane opening change value read within a certain delay time does not reach the change rate in the target direction, it is determined that the governor is out of control to protect the safety of the generator set.

[0004] The problem with the above-mentioned prior art is that when it is determined that the speed governor is out of control and an emergency shutdown is taken, the amplitude of the relay action is too large, causing the unit to shed load or overload, which does not meet the fault protection and fault tolerance function requirements of the electro-hydraulic control device in the specifications and standards. Summary of the invention

[0005] In order to solve the above technical problems, the present invention proposes a method and system for locking the feedback disconnection of guide vanes and blades of a turbine governor.

[0006] The technical solution of the present invention is as follows:

[0007] The present invention provides a method for locking the feedback disconnection of guide vanes and blades of a turbine governor, comprising the following steps:

[0008] Step S1, using the relationship between the feedback signal and the output signal of the turbine governor guide vane and blade as a basis for judging the feedback disconnection fault state analysis;

[0009] Step S2, based on the judgment basis of the feedback disconnection fault state analysis, modify the turbine governor guide vane and blade control program, and set the judgment criterion of the turbine governor control program feedback disconnection;

[0010] Step S3, adding a feedback disconnection relay to each of the power supply circuits of the turbine governor guide vane and the blade proportional valve;

[0011] Step S4, when the turbine governor control program determines that the turbine governor guide vane and blade feedback are disconnected according to the feedback disconnection criterion, the control program issues a command to de-energize the feedback disconnection relay, quickly cuts off the operating power supply of the proportional valve, and clears the control voltage;

[0012] Step S5, making the electrical control of the turbine speed governor guide vane and blade proportional valve invalid, and the turbine speed governor guide vane and blade proportional valve maintain the current opening unchanged until the feedback disconnection is restored.

[0013] As a preferred implementation, the relationship between the feedback signal and the output signal of the turbine governor guide vane and blade is used as the judgment basis for the feedback disconnection fault state analysis; the specific contents include:

[0014] The feedback and output voltage signals of the turbine governor guide vanes and blades are equal and within the deviation range, and the output is controlled by the difference between the feedback signal and the given signal;

[0015] The feedback signals of the turbine governor guide vanes and blades are collected through typical circuits and sent to the governor controller for monitoring;

[0016] Monitor turbine governor guide vanes, blade opening and relay stroke feedback, and analyze relay feedback status through signal trend analysis;

[0017] The internal control program of the speed regulator determines the online comparative diagnosis of the feedback value and the given value. If the relationship between the signals deviates from the above principles, an early warning message is issued.

[0018] As a preferred implementation, the criterion for setting the feedback disconnection of the turbine speed governor control program is specifically that when the proportional valve control input is not zero, the feedback voltage measurement is zero and is less than the zero-position voltage fluctuation detected during normal operation, the guide vane and blade program acquisition values ​​are less than the preset values ​​and the delay time meets the delay threshold, then it is judged that a feedback disconnection fault has occurred.

[0019] As a preferred embodiment, the power supply circuit of the turbine speed governor guide vane and blade proportional valve is connected in series to a pair of normally open contacts of the feedback disconnection relay.

[0020] On the other hand, the present invention also provides a turbine governor guide vane and blade feedback disconnection locking system, comprising:

[0021] Module M1, based on the relationship between the feedback signal and the output signal of the turbine governor guide vane and blade, is used as the basis for judging the feedback disconnection fault state analysis;

[0022] Module M2, based on the judgment basis of feedback disconnection fault state analysis, modifies the turbine governor guide vane and blade control program and sets the judgment criterion of turbine governor control program feedback disconnection;

[0023] Module M3, adds a feedback disconnection relay to each of the power supply circuits of the turbine governor guide vane and blade proportional valve;

[0024] Module M4, when the turbine governor control program determines that the turbine governor guide vane and blade feedback are disconnected according to the feedback disconnection criterion, the control program issues a command to de-energize the feedback disconnection relay, quickly cuts off the operating power supply of the proportional valve, and clears the control voltage;

[0025] Module M5 makes the electrical control of the turbine speed governor guide vane and blade proportional valve invalid, and the turbine speed governor guide vane and blade proportional valve maintain the current opening unchanged until the feedback line is restored.

[0026] As a preferred implementation, the module M1 uses the relationship between the feedback signal and the output signal of the turbine governor guide vane and blade as the basis for judging the feedback disconnection fault state analysis; the specific contents include:

[0027] The feedback and output voltage signals of the turbine governor guide vanes and blades are equal and within the deviation range, and the output is controlled by the difference between the feedback signal and the given signal;

[0028] The feedback signals of the turbine governor guide vanes and blades are collected through typical circuits and sent to the governor controller for monitoring;

[0029] Monitor turbine governor guide vanes, blade opening and relay stroke feedback, and analyze relay feedback status through signal trend analysis;

[0030] The internal control program of the speed regulator determines the online comparative diagnosis of the feedback value and the given value. If the relationship between the signals deviates from the above principles, an early warning message is issued.

[0031] As a preferred implementation, the module M1 sets the criterion for feedback disconnection of the turbine speed governor control program, specifically, when the proportional valve control input is not zero, and the feedback voltage measurement is zero and is less than the zero-position voltage fluctuation detected during normal operation, the guide vane and blade program acquisition values ​​are less than the preset values ​​and the delay time meets the delay threshold, then it is judged that a feedback disconnection fault has occurred.

[0032] As a preferred embodiment, the power supply circuit of the turbine governor guide vane and blade proportional valve in the module M3 is connected in series to a pair of normally open contacts of the feedback disconnection relay.

[0033] On the other hand, the present invention further provides an electronic device having a computer program stored thereon, wherein when the computer program is executed by a processor, a method for locking the guide vane and blade feedback disconnection of a turbine governor as described in any embodiment of the present invention is implemented.

[0034] On the other hand, the present invention also provides a computer-readable medium for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors implement a turbine governor guide vane and blade feedback disconnection locking method as described in any embodiment of the present invention.

[0035] The present invention has the following beneficial effects:

[0036] 1. When the feedback signals of the turbine governor guide vane and blade servomotor disappear, the generator set is in the grid-connected power generation state, the servomotor stroke remains at the current position unchanged, and the current load carried by the generator set is maintained.

[0037] 2. Effectively control the load stability of the generator set to ensure the safety, stability and reliability of the power grid.

[0038] 3. The overall structure is simple, the transformation cost is low, and the control effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 This is a schematic diagram of the method flow of Example 1;

[0041] Figure 2 It is the electrical control diagram of the turbine governor guide vane and blade;

[0042] Figure 3 This is the circuit diagram of the feedback disconnection relay;

[0043] Figure 4 It is the guide vane program logic diagram;

[0044] Figure 5 This is the logic diagram of the blade program. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] It should be understood that the step numbers used in this document are only for convenience of description and are not intended to limit the order in which the steps are executed.

[0047] It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0048] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0049] The term "and / or" means and includes any and all possible combinations of one or more of the associated listed items.

[0050] Embodiment 1:

[0051] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will be combined with the specific embodiments of the present application and refer to the attached Figure 1 , clearly and completely describe the technical solution of the present invention.

[0052] In order to solve the problems in the prior art, the present invention provides a method for locking the feedback disconnection of the guide vanes and blades of a turbine governor, comprising the following steps:

[0053] Step S1, based on the relationship between the feedback signal and the output signal of the turbine governor guide vane and blade, as the basis for judging the feedback disconnection fault state analysis; Figure 2 The specific contents include:

[0054] The feedback and output voltage signals of the turbine governor guide vanes and blades are equal and within the deviation range, and the output is controlled by the difference between the feedback signal and the given signal;

[0055] The feedback signals of the turbine governor guide vanes and blades are collected through typical circuits and sent to the governor controller for monitoring;

[0056] Monitor turbine governor guide vanes, blade opening and relay stroke feedback, and analyze relay feedback status through signal trend analysis;

[0057] The internal control program of the speed regulator determines the online comparative diagnosis of the feedback value and the given value. If the relationship between the signals deviates from the above principles, an early warning message is issued to remind the operating personnel to handle the fault.

[0058] Step S2, based on the judgment basis of the feedback disconnection fault state analysis, modify the turbine governor guide vane and blade control program, and set the judgment criterion of the turbine governor control program feedback disconnection;

[0059] like Figure 4 Figure 5 As shown, modify the turbine governor guide vane / paddle control PCC program. When the proportional valve control input is not zero, and the feedback voltage is measured to be zero and less than the zero-position voltage fluctuation detected during normal operation, and the guide vane collected IF DYCY is less than -800, it is judged as feedback disconnection; when the blade collected IF LYCY is less than -800, it is judged as feedback disconnection.

[0060] Step S3, adding a feedback disconnection relay to each of the power supply circuits of the turbine governor guide vane and the blade proportional valve;

[0061] Modify the turbine governor guide vane and blade drive control circuit according to the program, that is, add a feedback disconnection relay (such as Figure 3 As shown), the power supply circuit of the turbine speed governor guide vane and blade proportional valve is connected in series to a pair of normally open contacts of the feedback disconnection relay.

[0062] Step S4, when the turbine governor control program determines that the turbine governor guide vane and blade feedback are disconnected according to the feedback disconnection criterion, the control program issues a command to de-energize the feedback disconnection relay, quickly cuts off the operating power supply of the proportional valve, and clears the control voltage;

[0063] When the collected IF DYCY or IF LYCY is less than -800, and the delay time meets the delay threshold, it is judged that a feedback disconnection fault occurs. At this time, the program FKDX D is set to 0 to make the feedback disconnection relay DDX2 of the guide vane proportional valve power supply circuit lose power, cut off the power supply of the proportional valve, and also clear the proportional valve control voltage. When it is judged that the turbine governor guide vane and blade feedback are disconnected, the relay is turned off to cut off the power supply of the proportional valve in a timely and rapid manner, and the control voltage is also cleared.

[0064] Step S5, making the electrical control of the turbine speed governor guide vane and blade proportional valve invalid, and the turbine speed governor guide vane and blade proportional valve maintain the current opening unchanged until the feedback disconnection is restored.

[0065] Cutting off the power supply of the proportional valve and clearing the control voltage can make the proportional valve lose power and maintain operation at the current opening, so that the output value is not maintained, and the proportional valve is always in the action state, resulting in the guide vane / paddle losing control, causing the unit to overspeed or fully close the guide vane. This method can effectively and quickly cut off the control circuit of the turbine governor guide vane and paddle proportional valve, making the electrical control of the turbine governor guide vane and paddle proportional valve invalid. The turbine governor guide vane and paddle proportional valve maintain the current opening until the feedback line is restored.

[0066] Embodiment 2:

[0067] This embodiment provides a turbine speed governor guide vane and blade feedback disconnection locking system, including:

[0068] Module M1, based on the relationship between the feedback signal and the output signal of the turbine governor guide vane and blade, is used as the basis for judging the feedback disconnection fault state analysis;

[0069] Module M2, based on the judgment basis of feedback disconnection fault state analysis, modifies the turbine governor guide vane and blade control program and sets the judgment criterion of turbine governor control program feedback disconnection;

[0070] Module M3, adds a feedback disconnection relay to each of the power supply circuits of the turbine governor guide vane and blade proportional valve;

[0071] Module M4, when the turbine governor control program determines that the turbine governor guide vane and blade feedback are disconnected according to the feedback disconnection criterion, the control program issues a command to de-energize the feedback disconnection relay, quickly cuts off the operating power supply of the proportional valve, and clears the control voltage;

[0072] Module M5 makes the electrical control of the turbine speed governor guide vane and blade proportional valve invalid, and the turbine speed governor guide vane and blade proportional valve maintain the current opening unchanged until the feedback line is restored.

[0073] Embodiment three:

[0074] This embodiment provides an electronic device having a computer program stored thereon, wherein when the computer program is executed by a processor, a method for locking the feedback disconnection of guide vanes and blades of a turbine governor as described in any embodiment of the present invention is implemented.

[0075] Embodiment 4:

[0076] This embodiment provides a computer-readable medium for storing one or more programs. When the one or more programs are executed by the one or more processors, the one or more processors implement a turbine governor guide vane and blade feedback disconnection locking method as described in any embodiment of the present invention.

[0077] In the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, c can be single or multiple.

[0078] Those of ordinary skill in the art will appreciate that the various units and algorithm steps described in the embodiments disclosed herein can be implemented in a combination of electronic hardware, computer software, and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0079] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0080] In several embodiments provided in the present application, if any function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory; hereinafter referred to as: ROM), random access memory (Random Access Memory; hereinafter referred to as: RAM), disk or optical disk, and other media that can store program codes.

[0081] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for locking the feedback disconnection of guide vanes and blades of a turbine governor, characterized in that: The following steps are involved: Step S1, using the relationship between the feedback signal and the output signal of the turbine governor guide vane and blade as a basis for judging the feedback disconnection fault state analysis; Step S2, based on the judgment basis of the feedback disconnection fault state analysis, modify the turbine governor guide vane and blade control program, and set the judgment criterion of the turbine governor control program feedback disconnection; Step S3, adding a feedback disconnection relay to each of the power supply circuits of the turbine governor guide vane and the blade proportional valve; Step S4, when the turbine governor control program determines that the turbine governor guide vane and blade feedback are disconnected according to the feedback disconnection criterion, the control program issues a command to de-energize the feedback disconnection relay, quickly cuts off the operating power supply of the proportional valve, and clears the control voltage; Step S5, making the electrical control of the turbine speed governor guide vane and blade proportional valve invalid, and the turbine speed governor guide vane and blade proportional valve maintain the current opening unchanged until the feedback disconnection is restored.

2. A method for locking the feedback disconnection of guide vanes and blades of a turbine governor according to claim 1, characterized in that: The relationship between the feedback signal and the output signal of the turbine governor guide vane and blade is used as the judgment basis for the feedback disconnection fault state analysis; the specific contents include: The feedback and output voltage signals of the turbine governor guide vanes and blades are equal and within the deviation range, and the output is controlled by the difference between the feedback signal and the given signal; The feedback signals of the turbine governor guide vanes and blades are collected through typical circuits and sent to the governor controller for monitoring; Monitor turbine governor guide vanes, blade opening and relay stroke feedback, and analyze relay feedback status through signal trend analysis; The internal control program of the speed regulator determines the online comparative diagnosis of the feedback value and the given value. If the relationship between the signals deviates from the above principles, an early warning message is issued.

3. A method for locking the feedback disconnection of guide vanes and blades of a turbine governor according to claim 1, characterized in that: The criterion for setting the feedback disconnection of the turbine speed governor control program is specifically that when the proportional valve control input is not zero, the feedback voltage measurement is zero and is less than the zero-position voltage fluctuation detected during normal operation, the guide vane and blade program acquisition values ​​are less than the preset values ​​and the delay time meets the delay threshold, it is determined that a feedback disconnection fault has occurred.

4. A method for locking the feedback disconnection of guide vanes and blades of a turbine governor according to claim 1, characterized in that: The power supply circuit of the guide vane and blade proportional valve of the turbine speed governor is connected in series to a pair of normally open contacts of the feedback disconnection relay.

5. A turbine governor guide vane and blade feedback disconnection locking system, characterized in that: include: Module M1, based on the relationship between the feedback signal and the output signal of the turbine governor guide vane and blade, is used as the basis for judging the feedback disconnection fault state analysis; Module M2, based on the judgment basis of feedback disconnection fault state analysis, modifies the turbine governor guide vane and blade control program and sets the judgment criterion of turbine governor control program feedback disconnection; Module M3, adds a feedback disconnection relay to each of the power supply circuits of the turbine governor guide vane and blade proportional valve; Module M4, when the turbine governor control program determines that the turbine governor guide vane and blade feedback are disconnected according to the feedback disconnection criterion, the control program issues a command to de-energize the feedback disconnection relay, quickly cuts off the operating power supply of the proportional valve, and clears the control voltage; Module M5 makes the electrical control of the turbine speed governor guide vane and blade proportional valve invalid, and the turbine speed governor guide vane and blade proportional valve maintain the current opening unchanged until the feedback line is restored.

6. A turbine governor guide vane and blade feedback disconnection locking system according to claim 4, characterized in that: The module M1 uses the relationship between the feedback signal and the output signal of the turbine governor guide vane and blade as the judgment basis for the feedback disconnection fault state analysis; the specific contents include: The feedback and output voltage signals of the turbine governor guide vanes and blades are equal and within the deviation range, and the output is controlled by the difference between the feedback signal and the given signal; The feedback signals of the turbine governor guide vanes and blades are collected through typical circuits and sent to the governor controller for monitoring; Monitor turbine governor guide vanes, blade opening and relay stroke feedback, and analyze relay feedback status through signal trend analysis; The internal control program of the speed regulator determines the online comparative diagnosis of the feedback value and the given value. If the relationship between the signals deviates from the above principles, an early warning message is issued.

7. A method for locking the feedback disconnection of guide vanes and blades of a turbine governor according to claim 5, characterized in that: The module M1 sets the criterion for feedback disconnection of the turbine speed governor control program, specifically, when the proportional valve control input is not zero, and the feedback voltage measurement is zero and is less than the zero-position voltage fluctuation detected during normal operation, the guide vane and blade program acquisition values ​​are less than the preset values ​​and the delay time meets the delay threshold, it is judged that a feedback disconnection fault occurs.

8. A method for locking the feedback disconnection of guide vanes and blades of a turbine governor according to claim 5, characterized in that: The power supply circuit of the turbine speed governor guide vane and blade proportional valve in the module M3 is connected in series to a pair of normally open contacts of the feedback disconnection relay.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, a method for locking the feedback disconnection of guide vanes and blades of a turbine governor as described in any one of claims 1 to 6 is implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, a method for locking the feedback disconnection of guide vanes and blades of a turbine governor as described in any one of claims 1 to 6 is implemented.

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