A blade loss protection shutdown method, system, electronic device and storage medium

Abstract

The present application relates to the field of industrial control technology, in particular to a kind of paddle loss protection shutdown method, system, electronic device and storage medium, method includes: obtaining water turbine operation swing data, rotating speed and accident shutdown function soft pressure plate operating state;Above-mentioned data is as the comprehensive criterion of paddle loss accident, whether to satisfy the established protection shutdown logic of pre-setting is judged;If yes, then according to the control signal of established protection shutdown logic to water turbine corresponding controlled equipment is sent, paddle loss accident shutdown process is triggered to carry out shutdown control.The present application sets up accident shutdown function soft pressure plate, introduces unit rotating speed, lower guide swing too large, water guide swing too large, top cover vibration too large signal and other swing data as the comprehensive criterion of unit paddle loss mechanical accident, and then triggers protection shutdown process, timely shuts down unit, can effectively avoid accident further deterioration, maximum limit reduces the damage degree of power station equipment facilities and power grid fluctuation disaster.

Description

Technical Field

[0001] This invention relates to the field of industrial control technology, and more specifically, to a method, system, electronic device, and storage medium for protecting and stopping a propeller in case of loss of connection. Background Technology

[0002] Axial-flow propeller turbines are suitable for hydropower stations with medium to low heads and large flow rates. They offer flexible active power adjustment and can perform peak shaving and frequency regulation tasks in the power grid. However, due to the low operating head, rapid and wide-ranging changes in operating head, and the inherently large unit flow rate of the unit, the probability of hydraulic imbalance is relatively high. In particular, when major faults such as blade disconnection or guide vane / blade misalignment occur, the turbine-generator unit may experience power fluctuations and severe abnormal vibrations, posing a significant threat to power station equipment and the safety of the power grid.

[0003] Therefore, providing a protective shutdown method for mechanical accidents such as blade disconnection in axial-flow propeller turbines, timely determining abnormal states caused by faults such as blade disconnection, and quickly responding to shutdown are of great significance for the safe and stable operation of power plants and power grids. Summary of the Invention

[0004] The purpose of this invention is to provide a protective shutdown method for mechanical accidents involving the loss of blade connection in axial-flow propeller turbines. By setting up a soft pressure plate for accident shutdown function, the invention introduces signals such as unit speed, excessive lower guide sway, excessive water guide sway, and excessive top cover vibration as comprehensive criteria for judging mechanical accidents involving the loss of blade connection, thereby triggering the protective shutdown process and shutting down the unit in a timely manner. This can effectively avoid risks such as damage to power plant equipment and facilities and grid oscillations, thus solving the problems pointed out in the background art.

[0005] The embodiments of the present invention are achieved through the following technical solution: a method for protecting and shutting down a propeller in case of blade disconnection, applied to the control system of an axial-flow propeller turbine, the method comprising:

[0006] Acquire data on turbine vibration, rotational speed, and the operating status of the soft pressure plate for emergency shutdown function;

[0007] The turbine's operating vibration data, speed, and the operating status of the emergency shutdown function soft pressure plate are used as comprehensive criteria for judging blade disconnection accidents to determine whether the pre-set protection shutdown logic is met.

[0008] If so, a control signal is sent to the controlled equipment corresponding to the turbine according to the established protection shutdown logic, triggering the blade disconnection accident shutdown process for shutdown control.

[0009] According to a preferred embodiment, the measurement points for the turbine's operating vibration swing data include: top cover X-axis horizontal vibration, top cover Y-axis horizontal vibration, lower guide bearing X-axis swing, lower guide bearing Y-axis swing, water guide bearing X-axis swing, and water guide bearing Y-axis swing.

[0010] According to a preferred embodiment, the predetermined protection shutdown logic includes one or more of the following:

[0011] The peak-to-peak value of the horizontal vibration in the X direction of the top cover or the peak-to-peak value of the horizontal vibration in the Y direction of the top cover is greater than the first preset threshold.

[0012] The peak value of the X-direction swing of the lower guide bearing or the peak value of the Y-direction swing of the lower guide bearing is greater than the second preset threshold.

[0013] The peak value of the X-direction swing of the water guide bearing or the peak value of the Y-direction swing of the water guide bearing is greater than the third preset threshold.

[0014] The rotational speed is greater than the fourth preset threshold; and,

[0015] The emergency shutdown function soft pressure plate is disengaged.

[0016] According to a preferred embodiment, if the peak-to-peak value of the horizontal vibration in the X direction of the top cover or the peak-to-peak value of the horizontal vibration in the Y direction of the top cover is greater than a first preset threshold, and the peak-to-peak value of the swing in the X direction of the lower guide bearing or the peak-to-peak value of the swing in the Y direction of the lower guide bearing is greater than a second preset threshold, and the peak-to-peak value of the swing in the X direction of the water guide bearing or the peak-to-peak value of the swing in the Y direction of the water guide bearing is greater than a third preset threshold, and the rotational speed is greater than a fourth preset threshold, and the soft pressure plate of the emergency shutdown function is deactivated, then the turbine operating state is determined to be blade disconnection.

[0017] According to a preferred embodiment, in the step of triggering the blade disconnection accident shutdown process for shutdown control, the blade disconnection accident shutdown process is triggered based on a control signal delay.

[0018] The present invention also provides a blade disconnection protection shutdown device, applied to the control system of an axial-flow propeller turbine, the device comprising:

[0019] The acquisition module is used to acquire data on turbine operation vibration, speed, and the operating status of the soft pressure plate for emergency shutdown function;

[0020] The judgment module is used to take the turbine's running vibration data, speed, and the operating status of the emergency shutdown function soft pressure plate as a comprehensive criterion for blade disconnection accidents, and to determine whether the preset protection shutdown logic is met.

[0021] The control module is used to send a control signal to the controlled equipment corresponding to the turbine according to the predetermined protection shutdown logic when the judgment result of the judgment module is yes, thereby triggering the blade disconnection accident shutdown process for shutdown control.

[0022] The present invention also provides an electronic device, comprising:

[0023] Memory, the memory storing execution instructions; and

[0024] A processor that executes the execution instructions stored in the memory, causing the processor to perform the method described above.

[0025] The present invention also provides a readable storage medium storing executable instructions, which, when executed by a processor, implement the method described above.

[0026] The technical solution of this invention has at least the following advantages and beneficial effects: The blade disconnection protection shutdown method provided by this invention, by setting up an emergency shutdown function soft pressure plate, introduces vibration data such as unit speed, excessive lower guide sway, excessive water guide sway, and excessive top cover vibration signals as a comprehensive criterion for mechanical accidents of unit blade disconnection, thereby triggering the protection shutdown process and shutting down the unit in a timely manner, which can effectively avoid further deterioration of the accident and minimize the damage to power plant equipment and facilities and the disaster of power grid fluctuations. Attached Figure Description

[0027] Figure 1 This is a schematic flowchart of the blade disconnection protection shutdown method provided in Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the hardware structure of the propeller disconnection protection shutdown method provided in Embodiment 1 of the present invention;

[0029] Figure 3 This is a protection shutdown logic diagram for a propeller disconnection accident provided in Embodiment 1 of the present invention. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Example 1

[0032] This embodiment provides a method for shutting down a turbine in case of blade disconnection, applicable to the control system of an axial-flow propeller turbine, such as... Figure 1 The diagram shown illustrates the process. The specific protection shutdown method includes the following steps:

[0033] 1) Data acquisition steps, the specific steps are as follows:

[0034] 1.1) The turbine's oscillation data is acquired using a oscillation signal acquisition box. In one embodiment of this invention, see [link to relevant documentation]. Figure 2 As shown, a vibration sensor is used to acquire the analog voltage signal of the top cover vibration, and a swing sensor is used to acquire the analog voltage signal of the swing of the lower guide bearing and the water guide bearing. In this embodiment, the vibration sensor used is the Aojiyi DPS series low-frequency vibration sensor, and the swing sensor used is the Rockwell model. 1442-DR-5890; The specific measurement points of each sensor are arranged as follows: top cover X-axis horizontal vibration, top cover Y-axis horizontal vibration, lower guide bearing X-axis swing, lower guide bearing Y-axis swing, water guide bearing X-axis swing, and water guide bearing Y-axis swing; Further, the sensors at each measurement point are connected to the vibration and oscillation signal acquisition box, which collects the analog voltage signals of each sensor to the same port for unified uploading. In this embodiment, the vibration and oscillation signal acquisition box is model Aojiyi SPU2100; Further, the vibration and oscillation signal acquisition box sends the collected analog voltage signals to the industrial panel PC for signal processing. After signal processing, the signals are connected to the PLC controller via the serial communication board to complete the acquisition of vibration and oscillation data. In this embodiment, the industrial panel PC is model Aojiyi P150-4M, the PLC controller is model NARI MB80CPU722EZ, and the serial communication board is model NARI MB80CPM018.

[0035] 1.2) A speed sensor is used to obtain the voltage analog signal of the turbine speed. The voltage analog signal of the speed sensor is further introduced into the speed measuring device. The speed measuring device uploads the collected 4-20mA analog signal of the speed to the PLC controller through hard wiring. In this embodiment, the speed sensor is model Turck Bi4U-M12-AN6X and the speed measuring device is model NARI SJ-22D.

[0036] 1.3) Install a soft stop function in the host computer of the turbine unit monitoring system to enable and disable the emergency stop function for excessive turbine vibration; monitor the operating status of the soft stop function and upload the soft stop function deactivation signal to the PLC controller.

[0037] 2) Accident judgment steps, see Figure 3 As shown, the specific steps are as follows:

[0038] 2.1) The turbine's operating vibration data, speed, and the operating status of the soft pressure plate of the emergency shutdown function are used as comprehensive criteria for determining whether the blade disconnection accident meets the preset protection shutdown logic. If so, a control signal is sent to the corresponding controlled equipment of the turbine according to the preset protection shutdown logic to trigger the blade disconnection accident shutdown process for shutdown control.

[0039] In one specific embodiment of this invention, the predetermined protection shutdown logic includes one or more of the following:

[0040] 2.1.1) The peak-to-peak value of the horizontal vibration in the X direction of the top cover or the peak-to-peak value of the horizontal vibration in the Y direction of the top cover is greater than the first preset threshold A;

[0041] 2.1.2) The peak value of the X-direction swing of the lower guide bearing or the peak value of the Y-direction swing of the lower guide bearing is greater than the second preset threshold B;

[0042] 2.1.3) The peak value of the X-direction swing of the water guide bearing or the peak value of the Y-direction swing of the water guide bearing is greater than the third preset threshold C;

[0043] 2.1.4) The rotational speed is greater than the fourth preset threshold D. In a preferred embodiment, the fourth preset threshold D is 95% of the rated rotational speed.

[0044] 2.1.5) Emergency shutdown function soft pressure plate exit.

[0045] It should be noted that the shutdown logic can be set in any combination according to the above logic. In one embodiment of this example, the predetermined protection shutdown logic is as follows: if the peak value of the horizontal vibration of the top cover in the X direction or the peak value of the horizontal vibration of the top cover in the Y direction is greater than the first preset threshold, and the peak value of the swing of the lower guide bearing in the X direction or the peak value of the swing of the lower guide bearing in the Y direction is greater than the second preset threshold, and the peak value of the swing of the water guide bearing in the X direction or the peak value of the swing of the water guide bearing in the Y direction is greater than the third preset threshold, and the rotational speed is greater than the fourth preset threshold, and the soft pressure plate of the emergency shutdown function is deactivated, then the turbine operating state is determined to be blade disconnection.

[0046] Furthermore, in the step of triggering the blade disconnection accident shutdown process for shutdown control, the blade disconnection accident shutdown process is triggered based on a control signal delay. In one embodiment of this example, the specific thresholds A, B, and C for determining the degree of upper cover vibration, as well as the delay time for triggering the blade disconnection mechanical accident shutdown process, are adjusted according to the actual situation of the power station. Here, the thresholds A, B, and C are set to 1, but no specific restrictions are imposed.

[0047] In summary, the blade disconnection protection shutdown method provided by this invention, by setting up a soft pressure plate for emergency shutdown function, introduces vibration data such as unit speed, excessive lower guide sway, excessive water guide sway, and excessive top cover vibration as a comprehensive criterion for mechanical accidents of unit blade disconnection, thereby triggering the protection shutdown process and shutting down the unit in a timely manner. This can effectively prevent the accident from further deteriorating and minimize the damage to power plant equipment and facilities and the disaster of power grid fluctuations.

[0048] Furthermore, this embodiment also provides a blade disconnection protection shutdown device applied to the control system of an axial-flow propeller turbine. The device includes: an acquisition module for acquiring turbine operating oscillation data, speed, and the operating status of the emergency shutdown function soft pressure plate; a judgment module for using the turbine operating oscillation data, speed, and the operating status of the emergency shutdown function soft pressure plate as comprehensive criteria for blade disconnection accidents to determine whether a pre-set protection shutdown logic is met; and a control module for sending a control signal to the corresponding controlled equipment of the turbine according to the pre-set protection shutdown logic when the judgment result of the judgment module is yes, triggering the blade disconnection accident shutdown process for shutdown control.

[0049] Furthermore, this embodiment also provides an electronic device, including: a memory storing execution instructions; and a processor executing the execution instructions stored in the memory, causing the processor to perform the method described above.

[0050] Furthermore, this embodiment also provides a readable storage medium storing execution instructions, which, when executed by a processor, implement the method described above.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for protecting and shutting down a propeller in case of blade disconnection, characterized in that, The blade disconnection protection shutdown method, applied to the control system of an axial-flow propeller turbine, includes: Acquire data on turbine vibration, rotational speed, and the operating status of the soft pressure plate for emergency shutdown function; The turbine's operating vibration data, speed, and the operating status of the emergency shutdown function soft pressure plate are used as comprehensive criteria for judging blade disconnection accidents to determine whether the pre-set protection shutdown logic is met. If so, a control signal is sent to the controlled equipment corresponding to the turbine according to the established protection shutdown logic to trigger the blade disconnection accident shutdown process for shutdown control; The measurement points for the turbine's operating vibration swing data include: top cover X-axis horizontal vibration, top cover Y-axis horizontal vibration, lower guide bearing X-axis swing, lower guide bearing Y-axis swing, water guide bearing X-axis swing, and water guide bearing Y-axis swing. The predetermined protection shutdown logic includes one or more of the following: The peak-to-peak value of the horizontal vibration in the X direction of the top cover or the peak-to-peak value of the horizontal vibration in the Y direction of the top cover is greater than the first preset threshold. The peak value of the X-direction swing of the lower guide bearing or the peak value of the Y-direction swing of the lower guide bearing is greater than the second preset threshold. The peak value of the X-axis swing of the water guide bearing or the peak value of the Y-axis swing of the water guide bearing is greater than the third preset threshold. The rotational speed is greater than the fourth preset threshold; and, The emergency shutdown function soft pressure plate is disengaged; If the peak-to-peak value of the horizontal vibration in the X direction of the top cover or the peak-to-peak value of the horizontal vibration in the Y direction of the top cover is greater than the first preset threshold, and the peak-to-peak value of the swing in the X direction of the lower guide bearing or the peak-to-peak value of the swing in the Y direction of the lower guide bearing is greater than the second preset threshold, and the peak-to-peak value of the swing in the X direction of the water guide bearing or the peak-to-peak value of the swing in the Y direction of the water guide bearing is greater than the third preset threshold, and the rotational speed is greater than the fourth preset threshold, and the soft pressure plate of the emergency shutdown function is deactivated, then the turbine operating status is determined to be blade disconnection.

2. The blade disconnection protection shutdown method as described in claim 1, characterized in that, In the step of triggering the blade disconnection accident shutdown procedure for shutdown control, the blade disconnection accident shutdown procedure is triggered based on a control signal delay.

3. A blade disconnection protection shutdown device, characterized in that, An application in the control system of an axial-flow propeller turbine, the device comprising: The acquisition module is used to acquire data on turbine operation vibration, speed, and the operating status of the soft pressure plate for emergency shutdown function; The judgment module is used to take the turbine's running vibration data, speed, and the operating status of the emergency shutdown function soft pressure plate as a comprehensive criterion for blade disconnection accidents, and to determine whether the preset protection shutdown logic is met. The control module is used to send a control signal to the controlled equipment corresponding to the turbine according to the predetermined protection shutdown logic when the judgment result of the judgment module is yes, and to trigger the blade disconnection accident shutdown process to perform shutdown control. The measurement points for the turbine's operating vibration swing data include: top cover X-axis horizontal vibration, top cover Y-axis horizontal vibration, lower guide bearing X-axis swing, lower guide bearing Y-axis swing, water guide bearing X-axis swing, and water guide bearing Y-axis swing. The predetermined protection shutdown logic includes one or more of the following: The peak-to-peak value of the horizontal vibration in the X direction of the top cover or the peak-to-peak value of the horizontal vibration in the Y direction of the top cover is greater than the first preset threshold. The peak value of the X-direction swing of the lower guide bearing or the peak value of the Y-direction swing of the lower guide bearing is greater than the second preset threshold. The peak value of the X-axis swing of the water guide bearing or the peak value of the Y-axis swing of the water guide bearing is greater than the third preset threshold. The rotational speed is greater than the fourth preset threshold; and, The emergency shutdown function soft pressure plate is disengaged; If the peak-to-peak value of the horizontal vibration in the X direction of the top cover or the peak-to-peak value of the horizontal vibration in the Y direction of the top cover is greater than the first preset threshold, and the peak-to-peak value of the swing in the X direction of the lower guide bearing or the peak-to-peak value of the swing in the Y direction of the lower guide bearing is greater than the second preset threshold, and the peak-to-peak value of the swing in the X direction of the water guide bearing or the peak-to-peak value of the swing in the Y direction of the water guide bearing is greater than the third preset threshold, and the rotational speed is greater than the fourth preset threshold, and the soft pressure plate of the emergency shutdown function is deactivated, then the turbine operating status is determined to be blade disconnection.

4. An electronic device, characterized in that, include: The memory stores execution instructions; as well as A processor that executes execution instructions stored in the memory, causing the processor to perform the method as described in any one of claims 1 to 2.

5. A readable storage medium, characterized in that, The readable storage medium stores execution instructions that, when executed by a processor, implement the method as described in any one of claims 1 to 2.

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