A method and system for detecting action failure of a guide vane distribution valve of a hydro-turbine governor

Abstract

The application provides a guide vane distribution valve action fault detection method and system for a hydraulic turbine governor, wherein the method is applied to a PLC controller of an electric regulating cabinet in a hydraulic turbine governor system, an action fault detection program of a guide vane distribution valve of the hydraulic turbine governor is arranged in the PLC controller, and the method comprises the following steps: collecting operation information of the hydraulic turbine governor system; and detecting whether the guide vane distribution valve of the hydraulic turbine governor appears an action fault based on the collected operation information and the PLC controller. The technical scheme provided by the application can ensure high reliability, high durability and wide applicability of the guide vane distribution valve action fault detection of the hydraulic turbine governor.

Description

Technical Field

[0001] The present application relates to the technical field of distribution valve operation fault detection, and in particular to a method and system for detecting operation fault of a guide vane distribution valve of a turbine governor. Background Art

[0002] The turbine governor guide vane distribution valve is the core mechanical component of the governor system. It directly acts on the entire hydraulic system and controls the adjustment operation of the water guide mechanism. Distribution valve failure is also a first-level overspeed accident shutdown condition for the hydropower plant. Therefore, distribution valve failure seriously affects the safe and stable operation of the turbine generator set. How to correctly detect distribution valve failure in the governor system is also particularly critical.

[0003] At present, the fault detection of the distribution valve of the domestic speed governor mainly relies on the limit switch signal installed on the balance plate of the distribution valve for judgment. The balance plate follows the real-time action of the distribution valve to close or open the limit switch, realizes the monitoring of the distribution valve position signal, and then determines whether there is a distribution valve fault. However, this method has major disadvantages: First, the device needs to frequently follow the action of the distribution valve. In the long run, there are defects such as serious wear of the bracket transmission mechanism, aging and fatigue of the limit switch spring, and easy signal jitter, which directly affect the accuracy of the distribution valve fault detection; second, this device can only determine the fault of the distribution valve in the closing direction and lacks the function of judging the fault in the opening direction, making the detection incomplete; third, the limit switch generally has a shorter action stroke than the main distribution stroke. After a long period of action, the installation bracket is easy to loosen and the signal action is not sensitive, resulting in the long-term and stable operation of the turbine. Summary of the Invention

[0004] The present application provides a method and system for detecting the operation fault of the guide vane distribution valve of a turbine governor, which at least solves the technical problem in the related art of inaccurate and incomplete detection of distribution valve faults, which causes the turbine to be unable to operate stably for a long time.

[0005] A first embodiment of the present application provides a method for detecting an actuation fault of a guide vane distribution valve of a turbine governor, which is applied to a PLC controller of an electric control cabinet in a turbine governor system. The PLC controller is provided with an actuation fault detection program of the guide vane distribution valve of the turbine governor. The method includes:

[0006] collecting operation information of the turbine governor system;

[0007] Based on the collected operating information and the PLC controller, it is detected whether the turbine governor guide vane distribution valve has an action failure.

[0008] A second embodiment of the present application provides a turbine governor guide vane distribution valve operation fault detection system, the system comprising:

[0009] an acquisition module, configured to acquire operation information of the turbine governor system;

[0010] The detection module is used to detect whether the turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller.

[0011] The third aspect of the present application provides a non-temporary computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the prediction method of the first aspect of the present application is implemented.

[0012] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0013] This application provides a method and system for detecting operational failures of a turbine governor's guide vane distribution valve. The method comprises: collecting operational information of the turbine governor system; and detecting whether the turbine governor's guide vane distribution valve has experienced operational failures based on the collected operational information and a PLC controller. The technical solution provided by the present invention ensures high reliability, high durability, and wide applicability of turbine governor guide vane distribution valve operational failure detection.

[0014] 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 practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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:

[0016] Figure 1 This is a flow chart of a method for detecting an actuation failure of a guide vane distribution valve of a turbine governor provided according to one embodiment of the present application;

[0017] Figure 2 This is a specific flow chart of a method for detecting an actuation failure of a guide vane distribution valve of a turbine governor provided according to one embodiment of the present application;

[0018] Figure 3 The present invention is a structural diagram of a turbine governor guide vane distribution valve operation fault detection system provided according to one embodiment of the present application. DETAILED DESCRIPTION

[0019] The following describes in detail embodiments of the present application, examples of which 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.

[0020] This application proposes a method and system for detecting operational faults in a turbine governor's guide vane distribution valve. The method comprises: collecting operational information of the turbine governor system; and detecting whether the turbine governor's guide vane distribution valve has experienced operational faults based on the collected operational information and a PLC controller. The technical solution provided by the present invention ensures high reliability, high durability, and wide applicability of fault detection for turbine governor's guide vane distribution valve.

[0021] The following describes a method and system for detecting an actuation failure of a guide vane distribution valve of a turbine governor according to an embodiment of the present application with reference to the accompanying drawings.

[0022] Example 1

[0023] Figure 1 This is a flow chart of a method for detecting an actuation fault of a guide vane distribution valve of a turbine governor provided by an embodiment of the present disclosure. The method is applied to a PLC controller of an electric control cabinet in a turbine governor system. The PLC controller is provided with an actuation fault detection program of the guide vane distribution valve of the turbine governor, such as Figure 1 As shown, the method includes:

[0024] Step 1: collecting the operating information of the turbine governor system;

[0025] It should be noted that the operating information of the turbine governor system includes:

[0026] The power supply information of the AC incoming power supply and DC incoming power supply of the electric control cabinet in the turbine speed governor system, the failure discrete quantity of the PLC controller, the theoretical opening value of the guide vane distribution valve, the real-time opening value of the guide vane distribution valve, the change rate of the guide vane distribution valve, the theoretical opening value of the guide vane, the real-time opening value of the guide vane, the change rate of the guide vane, the frequency of the turbine and the operating information of whether the guide vane needs to be manually rotated.

[0027] Step 2: Based on the collected operating information and the PLC controller, detect whether the turbine governor guide vane distribution valve has an action failure.

[0028] It should be noted that the detection of whether the turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller includes:

[0029] If the PLC controller detects that the power information of the AC incoming power supply and the DC incoming power supply of the electric control cabinet disappears, it is determined that the electric control cabinet loses power.

[0030] It should be noted that the detection of whether a turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller further includes:

[0031] If the PLC controller detects that the failure discrete quantity of the PLC controller is equal to zero, it is determined that the PLC controller has failed.

[0032] For example, when the discrete output point of the PLC controller changes from 1 to 0, the PLC controller fails.

[0033] It should be noted that the detection of whether a turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller further includes:

[0034] Obtaining the absolute value of the difference between the theoretical opening value of the guide vane distribution valve and the real-time opening value of the guide vane distribution valve in each cycle of a preset time period;

[0035] If the PLC controller detects that the absolute values ​​of A cycles within the preset time period are all greater than the preset guide vane distribution valve opening difference threshold, and the change rate of the guide vane distribution valve is less than the preset first change rate threshold, it is determined that the guide vane distribution valve has an action following fault.

[0036] It should be noted that the detection of whether a turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller further includes:

[0037] Obtaining the absolute value of the difference between the theoretical opening value of the guide vane and the real-time opening value of the guide vane in each cycle of a preset time period;

[0038] If the PLC controller detects that the absolute values ​​of B cycles within a preset time period are all greater than the preset guide vane opening difference threshold, and the change rate of the guide vane is less than the preset second change rate threshold, it is determined that the guide vane relay has an action following fault.

[0039] It should be noted that the detection of whether a turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller further includes:

[0040] If the PLC controller detects that the frequency of the turbine is a fault frequency or the frequency of the turbine is a normal frequency and the frequency of the turbine is greater than a preset frequency threshold, and the guide vanes need to be rotated manually, it is determined that the guide vane distribution valve has a rotation fault.

[0041] It should be noted that the detection of whether a turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller further includes:

[0042] If any of the following faults is detected: power failure of the electric control cabinet or failure of the PLC controller, action follow-up failure of the guide vane distribution valve, action follow-up failure of the guide vane relay, and rotation failure of the guide vane distribution valve, it is determined that an action failure has occurred in the guide vane distribution valve of the turbine governor.

[0043] The specific implementation of the above-mentioned turbine governor guide vane distribution valve action failure detection method can be as follows: Figure 2 shown.

[0044] In summary, the method for detecting a turbine governor guide vane distribution valve operation failure provided by the embodiments of the present disclosure detects whether a turbine governor guide vane distribution valve operation failure occurs by collecting operating information of the turbine governor system and a PLC controller, thereby accurately detecting various causes of guide vane distribution valve failures. By performing logical judgment within the turbine governor system program, without the need to install a mechanical detection device, the method effectively avoids the problems of loose brackets, wear of the bracket rotation mechanism, aging of the limit switch spring, and easy signal jitter associated with traditional limit switch-based mechanical detection devices, effectively protecting the safety of various mechanical components of the hydro-generator set and effectively avoiding unplanned shutdowns caused by malfunctions or insensitivity of traditional mechanical detection devices. The method can also comprehensively cover various causes of guide vane distribution valve failures. Furthermore, since the method only requires adding program logical judgment within the PLC controller of the governor system's electric control cabinet, as long as the system operates normally, it has a long service life and requires almost no on-site maintenance. The method can also be widely applied to various turbine generator set governor systems to solve problems such as inaccurate guide vane distribution valve detection.

[0045] Example 2

[0046] Figure 3 This is a structural diagram of a turbine governor guide vane distribution valve operation fault detection system provided by an embodiment of the present disclosure, such as Figure 3 As shown, the system may include:

[0047] The acquisition module 100 is used to acquire the operation information of the turbine governor system;

[0048] The detection module 200 is used to detect whether the turbine governor guide vane distribution valve has an operation failure based on the collected operation information and the PLC controller.

[0049] In the embodiment of the present disclosure, the operation information of the turbine governor system includes:

[0050] The power supply information of the AC incoming power supply and DC incoming power supply of the electric control cabinet in the turbine speed governor system, the failure discrete quantity of the PLC controller, the theoretical opening value of the guide vane distribution valve, the real-time opening value of the guide vane distribution valve, the change rate of the guide vane distribution valve, the theoretical opening value of the guide vane, the real-time opening value of the guide vane, the change rate of the guide vane, the frequency of the turbine and the operating information of whether the guide vane needs to be manually rotated.

[0051] In the embodiment of the present disclosure, the detection module 200 is specifically configured to:

[0052] If the PLC controller detects that the power information of the AC incoming power supply and the DC incoming power supply of the electric control cabinet disappears, it is determined that the electric control cabinet loses power.

[0053] In the embodiment of the present disclosure, the detection module 200 is further configured to:

[0054] If the PLC controller detects that the failure discrete quantity of the PLC controller is equal to zero, it is determined that the PLC controller has failed.

[0055] In the embodiment of the present disclosure, the detection module 200 is further configured to:

[0056] Obtaining the absolute value of the difference between the theoretical opening value of the guide vane distribution valve and the real-time opening value of the guide vane distribution valve in each cycle of a preset time period;

[0057] If the PLC controller detects that the absolute values ​​of A cycles within the preset time period are all greater than the preset guide vane distribution valve opening difference threshold, and the change rate of the guide vane distribution valve is less than the preset first change rate threshold, it is determined that the guide vane distribution valve has an action following fault.

[0058] In the embodiment of the present disclosure, the detection module 200 is further configured to:

[0059] Obtaining the absolute value of the difference between the theoretical opening value of the guide vane and the real-time opening value of the guide vane in each cycle of a preset time period;

[0060] If the PLC controller detects that the absolute values ​​of B cycles within a preset time period are all greater than the preset guide vane opening difference threshold, and the change rate of the guide vane is less than the preset second change rate threshold, it is determined that the guide vane relay has an action following fault.

[0061] In the embodiment of the present disclosure, the detection module 200 is further configured to:

[0062] If the PLC controller detects that the frequency of the turbine is a fault frequency or the frequency of the turbine is a normal frequency and the frequency of the turbine is greater than a preset frequency threshold, and the guide vanes need to be rotated manually, it is determined that the guide vane distribution valve has a rotation fault.

[0063] In the embodiment of the present disclosure, the detection module 200 is further configured to:

[0064] If any of the following faults is detected: power failure of the electric control cabinet or failure of the PLC controller, action follow-up failure of the guide vane distribution valve, action follow-up failure of the guide vane relay, and rotation failure of the guide vane distribution valve, it is determined that an action failure has occurred in the guide vane distribution valve of the turbine governor.

[0065] In summary, the turbine governor guide vane distribution valve action fault detection system provided by the embodiment of the present disclosure includes: an acquisition module 100 and a detection module 200, which detects whether the turbine governor guide vane distribution valve has an action fault by collecting the operation information of the turbine governor system and the PLC controller, and can accurately detect the causes of various guide vane distribution valve failures; logical judgment can be made in the turbine governor system program without the need to install a mechanical detection device, effectively avoiding the loosening of the bracket, wear of the bracket rotation mechanism, and limit switch failure of the traditional limit switch-based mechanical detection device. The method can solve the problems of spring aging and signal jitter, effectively protect the safety of various mechanical components of the hydro-turbine generator set and effectively avoid the occurrence of unplanned shutdown events caused by malfunction or insensitivity of traditional mechanical detection devices; it can also comprehensively cover the failure of the guide vane distribution valve caused by various reasons. At the same time, since this method only needs to add program logic judgment in the PLC controller of the speed governor system, as long as the system operates normally, it has a long service life and almost no on-site maintenance workload. It can also be widely used in various types of hydro-turbine generator set speed governor systems to solve problems such as inaccurate detection of the guide vane distribution valve.

[0066] Example 3

[0067] In order to implement the above embodiments, the present disclosure also proposes a non-transitory computer-readable storage medium.

[0068] The computer device provided in this embodiment stores a computer program, which implements the method in Example 1 when executed by a processor.

[0069] In the description of the specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" 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 different embodiments or examples described in this specification and features of different embodiments or examples, unless they are contradictory.

[0070] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0071] 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 this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for detecting an operation fault of a guide vane distribution valve of a turbine speed governor, applied to a PLC controller of an electric control cabinet in a turbine speed governor system, wherein the PLC controller is provided with an operation fault detection program of the guide vane distribution valve of the turbine speed governor, characterized in that: The method comprises: collecting operation information of the turbine governor system; Detecting whether a turbine governor guide vane distribution valve has an operation failure based on the collected operation information and a PLC controller; The operation information of the turbine governor system includes: Power supply information of the AC and DC power supply of the electric control cabinet in the turbine speed governor system, failure discrete quantity of the PLC controller, theoretical opening value of the guide vane distribution valve, real-time opening value of the guide vane distribution valve, change rate of the guide vane distribution valve, theoretical opening value of the guide vane, real-time opening value of the guide vane, change rate of the guide vane, turbine frequency, and operating information indicating whether the guide vane needs to be manually rotated; The detecting whether a turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller further includes: Obtaining the absolute value of the difference between the theoretical opening value of the guide vane and the real-time opening value of the guide vane in each cycle of a preset time period; If the PLC controller detects that the absolute value of B cycles within a preset time period is greater than a preset guide vane opening difference threshold, and the change rate of the guide vane is less than a preset second change rate threshold, then it is determined that the guide vane servomotor has an action following fault; If the PLC controller detects that the frequency of the turbine is a fault frequency or the frequency of the turbine is a normal frequency and the frequency of the turbine is greater than a preset frequency threshold, and the guide vanes need to be manually rotated, then a rotation fault of the guide vane distribution valve is determined, wherein the preset frequency threshold is 115% of the rated frequency of the turbine; The detecting whether a turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller further includes: If any of the following faults is detected: power failure of the electric control cabinet or failure of the PLC controller, action follow-up failure of the guide vane distribution valve, action follow-up failure of the guide vane relay, and rotation failure of the guide vane distribution valve, it is determined that an action failure has occurred in the guide vane distribution valve of the turbine governor.

2. The detection method according to claim 1, wherein The detecting whether a turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller includes: If the PLC controller detects that the power information of the AC incoming power supply and the DC incoming power supply of the electric control cabinet disappears, it is determined that the electric control cabinet loses power.

3. The detection method according to claim 1, wherein The detecting whether a turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller further includes: If the PLC controller detects that the failure discrete quantity of the PLC controller is equal to zero, it is determined that the PLC controller has failed.

4. The detection method according to claim 1, wherein The detecting whether a turbine governor guide vane distribution valve has an action failure based on the collected operation information and the PLC controller further includes: Obtaining the absolute value of the difference between the theoretical opening value of the guide vane distribution valve and the real-time opening value of the guide vane distribution valve in each cycle of a preset time period; If the PLC controller detects that the absolute values ​​of A cycles within the preset time period are all greater than the preset guide vane distribution valve opening difference threshold, and the change rate of the guide vane distribution valve is less than the preset first change rate threshold, it is determined that the guide vane distribution valve has an action following fault.

5. A turbine governor guide vane distribution valve action fault detection system, characterized in that: The system comprises: a collection module for collecting operating information of a turbine governor system, the operating information of the turbine governor system including: power supply information of the AC incoming power supply and the DC incoming power supply of the electric control cabinet in the turbine governor system, a failure discrete quantity of a PLC controller, a theoretical opening value of a guide vane distribution valve, a real-time opening value of a guide vane distribution valve, a change rate of a guide vane distribution valve, a theoretical opening value of a guide vane, a real-time opening value of a guide vane, a change rate of a guide vane, a turbine frequency, and operating information indicating whether the guide vane needs to be manually rotated; a detection module, configured to detect whether a turbine governor guide vane distribution valve has an operation failure based on the collected operation information and a PLC controller; the detection module is further configured to obtain an absolute value of a difference between a theoretical opening value of the guide vane and a real-time opening value of the guide vane in each cycle of a preset time period; If the PLC controller detects that the absolute value of B cycles within a preset time period is greater than a preset guide vane opening difference threshold, and the change rate of the guide vane is less than a preset second change rate threshold, then it is determined that the guide vane servomotor has an action following fault; If the PLC controller detects that the frequency of the turbine is a fault frequency or the frequency of the turbine is a normal frequency and the frequency of the turbine is greater than a preset frequency threshold, and the guide vanes need to be manually rotated, then a rotation fault of the guide vane distribution valve is determined, wherein the preset frequency threshold is 115% of the rated frequency of the turbine; If any of the following faults is detected: power failure of the electric control cabinet or failure of the PLC controller, action follow-up failure of the guide vane distribution valve, action follow-up failure of the guide vane relay, and rotation failure of the guide vane distribution valve, it is determined that an action failure has occurred in the guide vane distribution valve of the turbine governor.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

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