Distinguishing system and method for rejecting operation of main distributing valve of hydro-generator speed regulator

Abstract

The system comprises a main distributing valve displacement sensor, a guide vane displacement sensor, a servo valve feedback signal detection device, a unit frequency detection device and a speed regulator, and the speed regulator comprises a CPU module and an analog quantity input module. Wherein the CPU module pre-writes corresponding no-load opening degrees of a unit under different water heads, and is used for carrying out main and distribution operation refusing fault judgment according to each received analog quantity input signal; and under the conditions that the unit frequency is larger than a preset frequency threshold value, the main distributing displacement signal is larger than a signal corresponding to the middle position of the valve element, the feedback signal of the proportional servo valve is smaller than a closing action signal, and the opening degree of the guide vane is larger than the corresponding no-load opening degree under the current water head, it is judged that the main distributing valve refusal operation fault occurs. According to the system, the main distribution refusing fault can be accurately judged, the signal false alarm risk is reduced, and the accuracy, reliability and intelligence of main distribution refusing judgment are improved.

Description

Technical Field

[0001] The present application relates to the technical field of hydroelectric power generation equipment, and in particular to a system and method for determining whether a main pressure regulating valve of a hydroelectric generator governor refuses to operate. Background Art

[0002] The speed governor is an important control device in the hydro-turbine generator set, and its operating quality affects the safe and stable operation of the unit. The main pressure regulating valve of the speed governor (hereinafter referred to as the main regulating valve) is a key component for controlling the output torque of the engine. It mainly controls the working efficiency of the hydraulic cylinder by controlling the size of the oil pressure. The refusal of the main regulating valve of the speed governor means that the main regulating valve of the speed governor cannot operate normally for some reason. This kind of fault will cause the speed control system to be unable to stabilize the speed of the unit and affect the operation of the unit. Therefore, it is necessary to identify the refusal of the main regulating valve so as to take maintenance measures.

[0003] In the related art, the feedback of the main distribution refusal of the turbine speed governor is usually judged by a mechanical travel switch or a micro switch. The principle is to utilize the action of the main distribution valve core connecting rod to trigger the travel switch to make its contacts move to connect or disconnect the main distribution refusal signal circuit or control circuit to achieve a certain control purpose.

[0004] However, in actual applications, the mechanical main distribution refusal travel switch in the above-mentioned related technologies has the following problems: first, the accuracy of fault judgment is low, and the main distribution refusal signal is frequently activated during normal operation of the unit, resulting in false signal alarms; second, mechanical parts are frequently collided and compressed, and the springs are fatigued and cannot be reset due to long-term operation; third, the main distribution valve core stroke is short, the main distribution refusal travel switch is not easy to install and adjust, and has low reliability, short life, and is not easy to position and install. Summary of the invention

[0005] The purpose of this application is to solve one of the above-mentioned technical problems at least to a certain extent.

[0006] To this end, the first purpose of this application is to propose a system for distinguishing the refusal of the main pressure regulating valve of a hydro-turbine generator governor. The system combines a variety of newly added judgment logics for fault judgment, can accurately distinguish the main regulating valve refusal fault, reduce the risk of signal false alarm, and improve the accuracy, reliability and intelligence of the main regulating valve refusal judgment.

[0007] The second object of the present application is to provide a method for determining whether a main pressure regulating valve of a hydro-turbine generator governor refuses to operate.

[0008] A third object of the present application is to provide a non-transitory computer-readable storage medium.

[0009] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a system for determining whether the main pressure regulating valve of a hydro-turbine generator governor refuses to move, the system comprising: a main pressure regulating valve displacement sensor, a guide vane displacement sensor, a servo valve feedback signal detection device, a unit frequency detection device and a governor, wherein the governor comprises a CPU module and an analog input module, wherein:

[0010] The main pressure distribution valve displacement sensor, the guide vane displacement sensor, the servo valve feedback signal detection device and the unit frequency detection device are respectively connected to the analog input module to send the analog input signals collected by each to the speed governor;

[0011] The CPU module is pre-written with the no-load opening corresponding to the turbine unit under different water heads. The CPU module is used to judge the main distribution valve refusal to move fault according to the received analog input signals, wherein when the unit frequency is greater than the preset frequency threshold, the main distribution displacement signal is greater than the signal corresponding to the valve core middle position, the proportional servo valve feedback signal is less than the closing action signal and the guide vane opening is greater than the no-load opening corresponding to the current water head, it is determined that the main pressure distribution valve refusal to move fault occurs.

[0012] In addition, the system for determining whether the main pressure regulating valve of the hydro-turbine generator governor refuses to operate according to the embodiment of the present application also has the following additional technical features:

[0013] Optionally, in some embodiments, the system further includes: a PLC system for monitoring the turbine unit, and the speed governor further includes: a switch output module, wherein the switch output module is connected to the PLC system; the CPU module is also used to generate a main pressure distribution valve refusal signal when it is determined that a main pressure distribution valve refusal to move fault occurs, and send the main pressure distribution valve refusal signal to the PLC system through the switch output module.

[0014] Optionally, in some embodiments, the system further includes: a turbine unit speed measuring device, wherein the turbine unit speed measuring device is used to detect the speed of the generator in the turbine unit, and when the speed of the generator is greater than the overspeed threshold, sends an overspeed signal to the PLC system; the PLC system is also used to start the turbine unit accident shutdown process when receiving the main distribution refusal signal and the overspeed signal.

[0015] Optionally, in some embodiments, the preset frequency threshold is the unit frequency corresponding to when the unit speed reaches a predicted speed, wherein the predicted speed is less than the overspeed threshold so as to enable advance prediction, and the overspeed threshold and the predicted speed are greater than the rated speed of the turbine unit.

[0016] Optionally, in some embodiments, the signal corresponding to the valve core neutral position is a pre-calibrated feedback current signal of the main pressure regulating valve when the valve core of the main pressure regulating valve is in the neutral position.

[0017] Optionally, in some embodiments, the closing action signal is a current threshold signal for the proportional servo valve to move in a closing direction.

[0018] To achieve the above object, a second embodiment of the present invention provides a method for determining whether a main pressure regulating valve of a hydro-turbine generator governor refuses to operate, which is applied to the determination system for determining whether a main pressure regulating valve of a hydro-turbine generator governor refuses to operate in the first embodiment. The method comprises:

[0019] Read in real time the analog input signals collected by multiple analog detection devices in the judgment system of the main pressure regulating valve refusal of the hydro-generator governor, wherein the multiple analog input signals include the current unit frequency of the hydro-generator unit, the main pressure regulating valve displacement signal, the proportional servo valve feedback signal and the guide vane opening;

[0020] Detecting the corresponding no-load opening under the current water head, and comparing the multiple analog input signals with the corresponding logic judgment conditions respectively;

[0021] Based on the comparison results, when the unit frequency is greater than the frequency threshold, the main pressure distribution displacement signal is greater than the signal corresponding to the valve core middle position, the proportional servo valve feedback signal is less than the closing action signal and the guide vane opening is greater than the no-load opening corresponding to the current water head, it is determined that a main pressure distribution valve refusal to move failure has occurred.

[0022] To achieve the above-mentioned purpose, the third aspect of the present invention proposes a non-temporary computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, it implements a method for determining whether the main pressure regulating valve of a hydro-turbine generator governor refuses to move as described in any one of the second aspect embodiments above.

[0023] The technical solution provided by the embodiments of the present application brings at least the following beneficial effects:

[0024] The present application can accurately locate the position of the main pressure distribution valve core, and at the same time, combined with the generator frequency, the no-load opening under the current water head, and the servo valve feedback signal and other main distribution refusal judgment logics, it realizes the accurate judgment of the main distribution refusal fault, and can accurately and in advance predict the main distribution refusal signal, significantly reducing the risk of false alarm of the main distribution refusal signal during normal operation of the unit, and ensuring the reliability of the judgment result. And based on the advance prediction of the main distribution refusal fault, it is conducive to the unit monitoring system to take relevant protective measures in time to avoid accidents. In addition, the present application replaces the original mechanical main distribution refusal travel switch with the newly added judgment logic, which effectively avoids the problems of mechanical travel switch being difficult to install and adjust, low reliability, short life and easy damage. It is easy to implement in practical applications, reduces the failure probability of the main distribution refusal identification equipment, and avoids the frequent action of the main distribution refusal signal. Therefore, the present application improves the accuracy, reliability and intelligence of the main distribution refusal judgment, which is conducive to ensuring the safe and stable operation of the hydropower unit.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0027] Figure 1 A schematic diagram of the structure of a system for determining whether a main pressure regulating valve of a hydro-generator governor refuses to operate, as proposed in an embodiment of the present application;

[0028] Figure 2 A structural schematic diagram of a specific system for determining if a main pressure regulating valve of a hydro-turbine generator governor refuses to operate, as proposed in an embodiment of the present application;

[0029] Figure 3 A flow chart of a method for determining whether a main pressure regulating valve of a hydro-turbine generator governor refuses to operate, as proposed in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the principle of a main pressure regulating valve refusal to move judgment logic proposed in an embodiment of the present application. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0032] The following describes, with reference to the accompanying drawings, a system and method for determining whether a main pressure regulating valve of a hydro-turbine generator governor refuses to operate according to an embodiment of the present application.

[0033] Figure 1 The schematic diagram of the structure of a system for determining whether the main pressure regulating valve of a hydro-generator governor refuses to operate is provided in an embodiment of the present application. Figure 1 As shown, the system includes: a main pressure regulating valve displacement sensor 10, a guide vane displacement sensor 20, a servo valve feedback signal detection device 30, a unit frequency detection device 40 and a speed regulator 50. The speed regulator 50 also includes a CPU module 51 and an analog input module 52.

[0034] Among them, the main pressure distribution valve displacement sensor 10, the guide vane displacement sensor 20, the servo valve feedback signal detection device 30, and the unit frequency detection device 40 are respectively connected to the analog input module 52 to send the analog input signals collected by each to the speed governor 50. That is, the analog input signals received by the analog input module 52 include the main distribution valve core displacement, the guide vane opening, the proportional servo valve feedback signal and the unit frequency of the turbine unit.

[0035] The speed governor 50 in the present application is an intelligent speed governor including a microcontroller, a memory and a data input and output device. For example, the speed governor 50 may be a PCC series speed governor, which includes a controller, i.e., a CPU module 51, in which a main distribution refusal judgment logic of the turbine unit is newly added.

[0036] Among them, the CPU module 51 has pre-written the no-load opening corresponding to the turbine unit under different water heads (water potential energy). By comparing the analog signal sent by the guide vane displacement sensor 20 with the no-load opening relationship curve written in advance, the relationship between the guide vane opening and the no-load opening under the current water head can be accurately judged, thereby realizing the function of accurately generating the no-load opening signal under each water head.

[0037] Furthermore, when judging the main pressure distribution valve refusal to move based on the onboard judgment logic, the CPU module 51 judges the main pressure distribution valve refusal to move according to the analog input signals sent by the above-mentioned detection devices. When the unit frequency is greater than the preset frequency threshold, the main distribution displacement signal is greater than the signal corresponding to the valve core middle position, the proportional servo valve feedback signal is less than the closing action signal and the guide vane opening is greater than the no-load opening corresponding to the current water head, it is judged that the turbine unit currently has a main pressure distribution valve refusal to move fault.

[0038] Furthermore, in order to ensure the normal operation of the turbine unit according to the judgment result of the main pressure regulating valve refusing to operate, in one embodiment of the present application, Figure 2 As shown, the identification system further includes a PLC system 60 for monitoring the hydro-turbine unit, and the speed regulator 50 further includes: a switch output module 53 .

[0039] Among them, the switch output module 53 is connected to the PLC system 60, and the CPU module 51 is also used to generate a main pressure distribution valve refusal signal when it is determined that a main pressure distribution valve refusal failure occurs, and send the main pressure distribution valve refusal signal to the PLC system 60 through the switch output module.

[0040] Specifically, in this embodiment, the switch output module 53 is used to output a "main distribution failure" signal to the monitoring PLC system 60, so that the PLC system 60 can detect in real time whether a main distribution failure occurs in the turbine unit, and promptly issue an alarm and relevant operation and maintenance measures when receiving the main distribution failure signal.

[0041] For example, the PLC system 60 can control the display screen of the remote monitoring center to display the main distribution refusal signal, control the relevant alarm equipment to sound and light alarm, and send the main distribution refusal alarm information to the mobile terminal of the relevant staff, so as to remind the relevant staff to check the fault in time.

[0042] In this embodiment, Figure 2 As shown, the system further includes a turbine speed measuring device 70, which is used to detect the speed of the generator in the turbine and, when the speed of the generator is greater than the overspeed threshold, send an overspeed signal to the PLC system 60. Furthermore, the PLC system 60 is also used to start the turbine accident shutdown process when receiving the main distribution refusal signal and the overspeed signal.

[0043] In this embodiment, the preset frequency threshold is the unit frequency corresponding to when the unit speed reaches the predicted speed, wherein the predicted speed is less than the overspeed threshold so as to enable advance prediction, and the overspeed threshold and the predicted speed are greater than the rated speed of the turbine unit.

[0044] Specifically, since the main distribution refusal signal of the turbine speed governor is that the speed of the generator is too high, the main condition for executing the shutdown action when an overspeed accident occurs is that the main distribution refusal fault judgment logic newly added in the embodiment of the present application adds a frequency judgment condition to the judgment condition of the main distribution refusal signal, and adjusts the frequency judgment criterion so that the main distribution refusal frequency judgment criterion is less than the frequency corresponding to the overspeed accident, so that early prediction can be made.

[0045] Since there is a corresponding relationship between the frequency and the rotation speed of the unit, the present embodiment can measure the rotation speed of the unit through the turbine unit rotation speed measuring device 70 to determine the unit frequency, that is, two detection devices, the unit frequency detection device 40 and the turbine unit rotation speed measuring device 70, can be respectively provided, or only the rotation speed measuring device can be provided to detect the rotation speed and frequency. As an example, the rotation speed of the unit gear disc can be detected by the turbine unit rotation speed measuring device 70.

[0046] For example, based on a large number of experiments and actual historical application data, it can be known that when the speed of the unit generator reaches 115% of the rated speed (i.e., the overspeed threshold), an overspeed accident will occur, and the corresponding frequency of the turbine unit is 57.5Hz. Therefore, combined with actual factors such as the discrimination accuracy requirements and the unit safety protection requirements, this embodiment can set the frequency corresponding to when the unit speed reaches 110% of the rated speed (i.e., the predicted speed), that is, 55Hz as the preset frequency threshold.

[0047] It can be understood that in this embodiment, the overspeed threshold and the predicted speed are determined based on the rated speed of the turbine unit, and both are greater than the rated speed of the turbine unit, and the predicted speed is less than the overspeed threshold, so that before the overspeed accident occurs, when the generator speed reaches the predicted speed and continues to increase, it can be predicted in advance that the main pressure regulating valve may refuse to move.

[0048] In one embodiment of the present application, the signal corresponding to the valve core neutral position is a pre-calibrated feedback current signal of the main pressure regulating valve when the valve core of the main pressure regulating valve is in the neutral position. The closing action signal is a current threshold signal for the proportional servo valve to move in the closing direction.

[0049] For example, since the valve core of the main pressure-distributing valve can be positioned at different end positions such as left, middle and right, this embodiment pre-calibrates the current value of the current signal fed back by the main pressure-distributing valve when the valve core of the main pressure-distributing valve is in the middle position. For example, the feedback current signal is 12mA when the main pressure-distributing valve core is in the middle position. When the main pressure-distributing displacement signal (i.e., the current signal fed back when the valve core of the main pressure-distributing valve is displaced) is greater than the preset signal corresponding to the middle position of the valve core, i.e., when the main pressure-distributing feedback current is greater than 12mA, it indicates that the main pressure-distributing valve core is not in a position biased towards the closing direction.

[0050] The closing action signal is a pre-calibrated current threshold signal when the proportional servo valve starts to move in the closing direction, for example, 12mA. When the feedback current of the proportional servo valve is less than 12mA, it indicates that the proportional servo valve moves in the closing direction and is currently in the closed position.

[0051] In summary, in this embodiment, the judgment logic of the main distribution refusal signal is: when the gear speed measurement is normal, the unit frequency is greater than 55Hz, the main distribution displacement feedback current is greater than 12mA, the proportional servo valve feedback current is less than 12mA and the guide vane opening is greater than the no-load opening under the current water head, it indicates that the main distribution refuses to move, and the CPU module 51 sends a main distribution refusal signal to the PLC system 60.

[0052] It is understandable that, since the identification system of the main pressure regulating valve refusal of the turbine generator speed regulator of the present application cancels the original mechanical main regulating valve refusal travel switch, it can avoid the mechanical switch frequently opening the "main regulating valve refusal" signal when the main regulating valve moves in the closing direction. And because the mechanical switch is omitted, the problems of mechanical travel switches being difficult to install and adjust, having low reliability, short life, and being difficult to locate and install are solved. The identification system of the present application has a higher identification accuracy. By installing it in the control module, the steps of operating and maintaining mechanical equipment can be omitted in practical applications, making it easy to implement.

[0053] In summary, the discrimination system of the main pressure distribution valve refusal to move of the turbine generator governor implemented in this application can accurately locate the position of the main pressure distribution valve core, and at the same time, combined with the generator frequency, the no-load opening under the current water head, and the servo valve feedback signal and other main distribution refusal judgment logics, the main distribution refusal to move fault can be accurately and pre-judged. The main distribution refusal signal can be predicted in advance, which significantly reduces the risk of false alarm of the main distribution refusal signal during normal operation of the unit, and ensures the reliability of the judgment result. And based on the advance prediction of the main distribution refusal to move fault, it is conducive to the unit monitoring system to take relevant protective measures in time to avoid accidents. In addition, the system replaces the original mechanical main distribution refusal to move stroke switch with the newly added judgment logic, which effectively avoids the problems of mechanical travel switch being difficult to install and adjust, low reliability, short life and easy damage. It is easy to implement in practical applications, reduces the failure probability of the main distribution refusal to move identification equipment, and avoids the frequent action of the main distribution refusal to move signal. As a result, the system improves the accuracy, reliability and intelligence of the main distribution refusal to move judgment, which is conducive to ensuring the safe and stable operation of the hydropower unit.

[0054] In order to more clearly illustrate the main pressure regulating valve refusal judgment logic through the judgment system of the main pressure regulating valve refusal of the hydro-turbine generator speed governor, a judgment method for the main pressure regulating valve refusal of the hydro-turbine generator speed governor proposed in the embodiment of the present application is described in detail below. The method is applied to the judgment system of the main pressure regulating valve refusal of the hydro-turbine generator speed governor in the above embodiment, that is, the judgment method of this embodiment is realized by performing relevant control on the judgment system in the above embodiment. The various components included in the system involved in the method are as described in the above embodiment and will not be repeated here. The execution body of the judgment method for the main pressure regulating valve refusal of the hydro-turbine generator speed governor in the embodiment of the present application can be the CPU module in the judgment system in the above embodiment.

[0055] Combine the following Figure 3 and Figure 4 This determination method will be described in detail. Figure 3 This is a flow chart of a method for determining whether a main pressure regulating valve of a hydro-turbine generator governor refuses to operate, as proposed in an embodiment of the present application. Figure 4 A schematic diagram of the principle of the main pressure distribution valve refusal to move judgment logic proposed in the embodiment of the present application is shown as follows: Figure 3As shown, the method comprises the following steps:

[0056] Step S101: real-time reading of analog input signals collected by multiple analog detection devices in the judgment system of the main pressure regulating valve refusal of the turbine generator governor, wherein the multiple analog input signals include the current unit frequency of the turbine unit, the main regulating displacement signal, the proportional servo valve feedback signal and the guide vane opening.

[0057] Step S102: Detect the corresponding no-load opening under the current water head, and compare the multiple analog input signals with the corresponding logic judgment conditions respectively.

[0058] The logic judgment conditions in the present application include whether each analog input signal satisfies the relationship with a preset threshold value and is within a corresponding value range.

[0059] In one embodiment of the present application, the no-load opening corresponding to the current water head is detected, including: pre-recording the no-load opening corresponding to the turbine unit under different water heads, and generating a correspondence between the water head and the no-load opening of the turbine unit; substituting the current water head into the correspondence to determine the no-load opening corresponding to the current water head.

[0060] Specifically, in this embodiment, the corresponding no-load opening of the unit under each water head is pre-written in the speed governor PCC, and a corresponding relationship curve between the water head and the no-load opening of the turbine unit is generated by data fitting. In actual application, by comparing the analog signal sent by the guide vane displacement sensor with the no-load opening written in advance, including substituting the current water head in the detected operating environment into the above-mentioned corresponding relationship curve to obtain the current no-load opening of the unit, and then comparing the current no-load opening of the unit detected by the guide vane displacement sensor with the current no-load opening of the unit, it is possible to accurately determine whether the guide vane opening is above the current water head no-load opening.

[0061] Step S103: Based on the comparison result, when the unit frequency is greater than the frequency threshold, the main pressure distribution displacement signal is greater than the signal corresponding to the valve core middle position, the proportional servo valve feedback signal is less than the closing action signal and the guide vane opening is greater than the no-load opening corresponding to the current water head, it is determined that a main pressure distribution valve refusal to move fault occurs.

[0062] For example, according to the comparison results, when the main distribution feedback current is greater than 12mA and the unit frequency is greater than 55Hz (that is, the unit speed is greater than 110% of the rated speed), and the proportional servo valve is in the closed position, and the guide vane opening is greater than the no-load opening under the current water head (that is, the guide vane analog signal judgment), an advance judgment is made, and the original main distribution refusal to move is combined with the opening above the no-load opening into a new "main distribution refusal to move" signal.

[0063] This step adds frequency judgment to the main distribution refusal to move signal judgment condition, adjusts the frequency judgment criterion, and makes a prejudgment. At the same time, combining the proportional servo valve feedback signal with the no-load opening under the current water head can effectively avoid the risk of false alarm signal.

[0064] Furthermore, in one embodiment of the present application, after determining that a main pressure regulating valve refuses to operate failure occurs, it also includes: detecting the rotational speed of the generator in the turbine unit, and generating an overspeed signal when the rotational speed of the generator is greater than an overspeed threshold; when determining that a main pressure regulating valve refuses to operate failure occurs and an overspeed signal is generated, starting the turbine unit accident shutdown process.

[0065] Specifically, Figure 4 As shown in the figure, when the speed governor determines that the main pressure distribution valve refuses to move, it generates a main distribution refusal signal and sends it to the monitoring PLC. And when the speed measuring device detects that the generator speed of the unit exceeds 115% of the rated speed, it generates a 115% speed signal and sends it to the monitoring PLC. When the PLC system monitors that it has received the main distribution refusal signal and the 115% speed signal, it determines that an overspeed accident has occurred, and then starts the accident shutdown process, sending a shutdown action instruction to the relevant operating equipment to control the unit to perform shutdown protection.

[0066] In summary, the method for distinguishing the refusal of the main pressure distribution valve of the turbine generator governor implemented in this application can accurately locate the position of the main pressure distribution valve core, and at the same time, combined with the generator frequency, the no-load opening under the current water head, and the servo valve feedback signal and other main distribution refusal judgment logics, the main distribution refusal fault can be accurately and pre-judged, and the main distribution refusal signal can be accurately and pre-judged, which significantly reduces the risk of false alarm of the main distribution refusal signal during normal operation of the unit, and ensures the reliability of the judgment result. And based on the advance prediction of the main distribution refusal fault, it is conducive to the unit monitoring system to take relevant protection measures in time to avoid accidents. In addition, the method replaces the original mechanical main distribution refusal travel switch with the newly added judgment logic, which effectively avoids the problems of mechanical travel switch being difficult to install and adjust, low reliability, short life and easy damage. It is easy to implement in practical applications, reduces the failure probability of the main distribution refusal identification device, and avoids the frequent action of the main distribution refusal signal. Therefore, the method improves the accuracy, reliability and intelligence of the main distribution refusal judgment, which is conducive to ensuring the safe and stable operation of the hydropower unit.

[0067] In order to implement the above-mentioned embodiments, the present application also proposes a non-temporary computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the method for determining whether the main pressure regulating valve of the hydro-turbine generator governor refuses to move as proposed in the aforementioned second aspect embodiment of the present application.

[0068] It should be noted that it should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0069] In addition, in the description of the present application, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0071] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0073] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A system for determining whether a main pressure regulating valve of a hydro-generator governor refuses to operate, characterized in that: include: Main pressure distribution valve displacement sensor, guide vane displacement sensor, servo valve feedback signal detection device, unit frequency detection device and speed regulator, the speed regulator includes a CPU module and an analog input module, wherein: The main pressure distribution valve displacement sensor, the guide vane displacement sensor, the servo valve feedback signal detection device and the unit frequency detection device are respectively connected to the analog input module to send the analog input signals collected by each to the speed governor; The CPU module is pre-written with the no-load opening corresponding to the turbine unit under different water heads. The CPU module is used to judge the main distribution valve refusal to move fault according to the received analog input signals, wherein when the unit frequency is greater than the preset frequency threshold, the main distribution displacement signal is greater than the signal corresponding to the valve core middle position, the proportional servo valve feedback signal is less than the closing action signal and the guide vane opening is greater than the no-load opening corresponding to the current water head, it is determined that the main pressure distribution valve refusal to move fault occurs.

2. The identification system according to claim 1, characterized in that: Also includes: The PLC system for monitoring a hydro turbine unit, the speed governor further comprises: a switch output module, wherein: The switch output module is connected to the PLC system; The CPU module is also used to generate a main pressure distribution valve refusal signal when it is determined that a main pressure distribution valve refusal failure occurs, and send the main pressure distribution valve refusal signal to the PLC system through the switch output module.

3. The identification system according to claim 2, characterized in that: Also includes: A water turbine unit speed measuring device, the water turbine unit speed measuring device is used to detect the speed of the generator in the water turbine unit, and when the speed of the generator is greater than an overspeed threshold, sends an overspeed signal to the PLC system; The PLC system is also used to start the turbine unit emergency shutdown process when receiving the main distribution refusal signal and the overspeed signal.

4. The identification system according to claim 3, characterized in that: The preset frequency threshold is the unit frequency corresponding to when the unit speed reaches the predicted speed, wherein the predicted speed is less than the overspeed threshold so as to make an advance prediction, and the overspeed threshold and the predicted speed are greater than the rated speed of the turbine unit.

5. The identification system according to claim 1, characterized in that: The signal corresponding to the middle position of the valve core is a pre-calibrated feedback current signal of the main pressure regulating valve when the valve core of the main pressure regulating valve is in the middle position.

6. The identification system according to claim 1, characterized in that: The closing action signal is a current threshold signal for causing the proportional servo valve to move in a closing direction.

7. A method for determining whether a main pressure regulating valve of a hydro-generator governor refuses to operate, characterized in that: The system for determining whether the main pressure regulating valve of a hydro-turbine generator governor refuses to operate according to any one of claims 1 to 6, wherein the detection method comprises the following steps: Read in real time the analog input signals collected by multiple analog detection devices in the judgment system of the main pressure regulating valve refusal of the hydro-generator governor, wherein the multiple analog input signals include the current unit frequency of the hydro-generator unit, the main pressure regulating valve displacement signal, the proportional servo valve feedback signal and the guide vane opening; Detecting the corresponding no-load opening under the current water head, and comparing the multiple analog input signals with the corresponding logic judgment conditions respectively; Based on the comparison results, when the unit frequency is greater than the frequency threshold, the main pressure distribution displacement signal is greater than the signal corresponding to the valve core middle position, the proportional servo valve feedback signal is less than the closing action signal and the guide vane opening is greater than the no-load opening corresponding to the current water head, it is determined that a main pressure distribution valve refusal to move failure has occurred.

8. The identification method according to claim 7, characterized in that: After determining that the main pressure distribution valve refuses to operate fault occurs, the method further includes: Detecting the rotation speed of a generator in a hydro-turbine unit and generating an overspeed signal when the rotation speed of the generator is greater than an overspeed threshold; When it is determined that a main pressure regulating valve refusal to operate fault occurs and the overspeed signal is generated, the turbine unit accident shutdown process is started.

9. The identification method according to claim 7, characterized in that: The detecting of the no-load opening corresponding to the current water head includes: Pre-record the no-load opening of the turbine unit under different water heads, and generate the corresponding relationship between the water head and the no-load opening of the turbine unit; Substitute the current water head into the corresponding relationship to determine the no-load opening corresponding to the current water head.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, the method for determining whether the main pressure regulating valve of the hydro-turbine generator governor refuses to operate is implemented as described in any one of claims 7 to 9.

Images