A control method for gas turbine card insertion stability

Abstract

The present application relates to the technical field of gas turbine control, and discloses a control method for stability of plug-in and plug-out of a gas turbine clamp, which comprises the following steps: S1, detecting the system mainboard power supply state and the field subboard power supply state after the clamp is inserted into the base; S2, when both power supplies are normal, detecting the positioning pin signal arranged between the clamp and the base; S3, when both power supplies are normal and the positioning pin signal is continuously valid for multiple times, confirming that the clamp has been reliably inserted and stably powered on; S4, after the first power-on confirmation, executing delay reporting, and reporting the collected field data to the controller after a preset delay, and the subsequent data reporting no longer executes delay; and S5, if the power supply is abnormal or the continuously confirmed positioning pin signal is invalid, prohibiting refreshing the data buffer area, and the controller maintains the valid data at the last moment. The present application can prevent the clamp from mistakenly sampling zero values and refreshing the data buffer area during plug-in and plug-out, and ensure the safe and stable operation of the gas turbine.

Description

Technical Field

[0001] This invention relates to the field of gas turbine control technology, and in particular to a control method for the stability of gas turbine card insertion and removal. Background Technology

[0002] Circuit boards are critical components in gas turbine control systems, responsible for field data acquisition and equipment control. They act as the signal transmission medium between the controller and field devices, and their operational stability directly affects system safety. Under normal operating conditions, the circuit board acquires external signals and transmits them to the controller for logical operations. When the circuit board is removed, the controller retains the previous input value and continues its operations. However, even without any changes to the external wiring, occasional abnormal fluctuations in the acquired data occur after the circuit board is reinserted. These signal abrupt changes directly interfere with the controller's logical operations, seriously threatening the safe and reliable operation of the system.

[0003] The root cause of this problem lies in the card's dual-layer structure, consisting of a system motherboard and a field daughterboard stacked together. The two boards are powered independently by their respective bases. When the boards are inserted into the base, different insertion methods and angles lead to inconsistent power-on sequences. If the system motherboard powers on first, it starts normally and establishes communication with the controller. However, the field daughterboard is not yet powered on and cannot promptly transmit the acquired field signals to the motherboard. Without a valid signal, the motherboard mistakenly interprets the signal acquired by the daughterboard as zero, thus refreshing its data buffer and reporting a zero status signal to the controller. The controller then uses this abruptly changed signal value for logical operations. Due to the drastic change in the acquired data, the output of the entire control logic changes significantly, affecting the control safety of the entire gas turbine system. Therefore, this problem is a safety risk caused by board insertion and removal. Summary of the Invention

[0004] This invention provides a control method for the stability of gas turbine card insertion and removal. It aims to solve the technical problem in existing gas turbine control systems where inconsistent power-on timing and unstable insertion posture of dual-layer cards (system motherboard and field daughterboard) during insertion and removal lead to the system motherboard misjudging the field daughterboard's acquired signal as 0 and refreshing the data buffer, resulting in abnormal fluctuations in the acquired data, errors in controller logic operations, and ultimately threatening the safe and stable operation of the gas turbine.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: In a first aspect, the present invention provides a method for controlling the stability of gas turbine component insertion and removal, comprising the following steps: S1. Detect the power supply status of the system motherboard and the field daughterboard after the detection card is inserted into the base; S2. When both power supplies are normal, detect the positioning pin signal set between the card and the base. The positioning pin signal is used to indicate whether the card is inserted into place. S3. When both power supplies are normal and the positioning pin signal is valid multiple times in a row, confirm that the card has been reliably inserted and is powered on stably. S4. After the initial power-on confirmation, a delayed reporting is performed, and the collected field data is reported to the controller after a preset delay. Subsequent data reports will not be subject to the delay. S5. If the power supply is abnormal or the positioning pin signal is invalid after multiple consecutive sampling confirmations, the data buffer should not be refreshed and the controller should maintain the valid data from the previous moment.

[0006] In a preferred embodiment of the present invention, step S1, which detects the power supply status of the system motherboard and the field daughterboard after the detection card is inserted into the base, specifically includes: collecting the power supply voltage of the system motherboard and the power supply voltage of the field daughterboard respectively. When both voltages are within the rated operating range and the fluctuation is less than the preset deviation within a preset time, it is determined that the power supply is normal.

[0007] In a preferred embodiment of the present invention, before step S2, if any power supply is abnormal, the system motherboard enters a waiting state, does not perform positioning pin signal detection, and periodically retryes power supply detection until the power supply is normal or an alarm is triggered due to timeout.

[0008] In a preferred embodiment of the present invention, step S3, wherein the positioning pin signal is valid multiple times consecutively, specifically includes: sampling the positioning pin level signal multiple times consecutively; if the preset number of samplings are all valid levels, it is determined to be valid; if any sampling is invalid, the sampling count is cleared to zero and resampling is performed.

[0009] In a preferred embodiment of the present invention, in step S4, the preset delay varies depending on the type of board. Specifically, the delay time of analog input boards is longer than that of digital input boards, and the delay time of digital input boards is longer than that of output boards.

[0010] In a preferred embodiment of the present invention, in step S4, the preset delay is adaptively calculated based on the ramp-up slope of the field sub-board power supply voltage: the time required for the field sub-board power supply voltage to rise from a first preset percentage to a second preset percentage is collected, and the preset delay is determined based on the weighted sum of the base delay and the time required for the field sub-board power supply voltage to rise from the first preset percentage to the second preset percentage. The preset delay = base delay + k × T_slope, where k is a proportionality coefficient and T_slope is the time required for the field sub-board power supply voltage to rise from the first preset percentage to the second preset percentage. The preset delay is adaptively adjusted according to the gas turbine operating conditions, extending the delay time under transient conditions and restoring the original delay under steady-state conditions.

[0011] As a preferred embodiment of the present invention, the method further includes the determination of the first power-on: maintaining a non-volatile flag bit, when the positioning pin signal confirmed to be invalid after multiple consecutive samplings, and confirmed to be valid after multiple consecutive samplings again, it is regarded as a new insertion event, and the delayed reporting is performed again, and the collected field data is reported to the controller after a preset delay.

[0012] In a preferred embodiment of the present invention, the method further includes confirmation and retransmission after data reporting: the reported data frame carries a check code, and if no response is received from the controller within a specified time, the current data frame is retransmitted. After the retransmission limit is reached, the communication fault flag is set and the valid data of the previous moment is maintained.

[0013] In a preferred embodiment of the present invention, the positioning pin is disposed between the card and the base. The positioning pin includes at least two independent channels. The signal output terminal of each channel is connected to different signal acquisition ports of the system motherboard. The system motherboard determines that the positioning pin signal is valid only when all channels are sampled validly multiple times consecutively. If any channel is invalid, it is determined to be invalid and triggers a card loosening alarm.

[0014] As a preferred embodiment of the present invention, the method further includes a dynamic response to the loss of the positioning pin: during normal operation, if the positioning pin signal is sampled invalidly multiple times in a row, the data buffer is immediately frozen and the valid data of the previous moment is maintained, while triggering a card loosening alarm.

[0015] The beneficial effects of this invention are: This invention can fundamentally eliminate the risk of sudden changes in insertion and removal signals: by simultaneously detecting the power supply status of the system motherboard and the field daughterboard, and combining the continuous and effective judgment of the positioning pin signal, it ensures that reliable power-on is only confirmed after the board is fully inserted and the dual power supply is stable, thus avoiding signal misjudgment caused by inconsistent power-on timing.

[0016] This invention can improve the reliability of data reporting: after the initial power-on confirmation, a preset delay is performed for reporting, and the data is sent to the controller only after the board initialization is completed and the field signal acquisition is stable. This effectively filters out interference signals at the moment of power-on and ensures that the controller obtains real and stable field data.

[0017] This invention can distinguish between the initial and subsequent reports, balancing safety and efficiency: the initial power-on uses a delayed reporting method to ensure data reliability, while subsequent normal operation involves direct reporting without delay, thus ensuring safety during the startup phase without affecting the real-time performance of normal data acquisition.

[0018] This invention can adapt to various board types and operating conditions: the delay time can be set differently according to the board type (analog input, digital input, output), and it can also be adaptively calculated according to the voltage rise slope of the sub-board at the field, which has wide applicability and robustness.

[0019] This invention enhances the system's fault handling capabilities: when the power supply is abnormal or the positioning pin signal is invalid, refreshing the data buffer is prohibited, and the controller maintains the valid data from the previous moment. It also has mechanisms such as positioning pin redundancy judgment, dynamic response to signal loss, and data reporting confirmation and retransmission, which effectively prevent control logic errors caused by loose cards, communication abnormalities, etc., and significantly improve the safety and reliability of the gas turbine control system. Attached Figure Description

[0020] Figure 1 The present invention provides a flowchart of a method for controlling the stability of gas turbine card insertion and removal. Detailed Implementation

[0021] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides a control method for the stability of gas turbine card insertion and removal, which solves the signal mutation problem caused by card insertion and removal from both hardware structure and software logic aspects.

[0023] On the hardware side, the card's structure is optimized: a positioning pin is added between the system motherboard and the field daughterboard. The positioning pin signal is measured to determine whether the card is inserted into the base in a stable posture. The positioning pin can be set between the card and the base, and contains at least two independent channels. The signal output terminal of each channel is connected to different signal acquisition ports of the system motherboard to generate a contact signal that represents the insertion status, i.e., the positioning pin signal.

[0024] In terms of software logic, the power supply of the field side and the system side is first judged logically: the power supply voltage of the system motherboard and the power supply voltage of the field daughterboard are collected respectively. When both voltages are within the rated operating range and the fluctuation is less than the allowable deviation within a period of time, the power supply is judged to be normal. At the same time, the positioning pin level signal is sampled multiple times. It is required that several samples are valid levels before the positioning pin signal can be judged to be valid. If any one is invalid, the sampling count is cleared to zero and resampling is performed. Only when both power supplies are normal and the positioning pin signal is valid multiple times consecutively can it be confirmed that the card has been reliably inserted and stably powered on.

[0025] After confirming reliable power-on, the card implements a delayed reporting strategy: Upon initial power-on, the system motherboard reports the collected field data to the controller after a preset delay (typically 3-7 seconds, adjustable depending on the card type; analog input cards have the longest delay, followed by digital input cards, and output cards have the shortest). Subsequent data reports do not follow this delay to balance safe startup and real-time operation. Furthermore, the preset delay can be adaptively calculated based on the voltage ramp-up slope of the field daughterboards, collecting the time required for the voltage to rise from a first preset percentage (e.g., 10%) to a second preset percentage (e.g., 90%). The delay time = base delay + k × T_slope, and is limited to the preset range. Simultaneously, the system motherboard maintains a non-volatile flag to record whether the initial reporting is complete; when the positioning pin signal is lost and then recovered, it is considered a new insertion event, and the delayed reporting process is executed again.

[0026] If there is a power supply abnormality or the positioning pin signal is invalid, the system motherboard will not refresh the data buffer and will not report new data. The controller will maintain the valid data from the previous moment. Specifically, before detecting the positioning pin signal, if any power supply abnormality occurs, the system motherboard will enter a waiting state and periodically retry the power supply detection until the power supply is normal or a timeout alarm is triggered. During normal operation, if the positioning pin signal is invalidally sampled multiple times consecutively, the data buffer will be immediately frozen and a card loosening alarm will be triggered. In addition, this invention also includes a confirmation and retransmission mechanism after data reporting: the reported data frame carries a checksum. If no response is received from the controller within a specified time, the current data frame will be retransmitted. After reaching the retransmission limit, a communication fault flag will be set.

[0027] After multiple tests and verifications, the above-mentioned solution completely eliminates signal sampling abrupt changes caused by insertion and removal. This invention ensures insertion stability through hardware positioning pins, and by using dual logic judgments based on power supply and positioning pins, as well as a delayed reporting upon first power-on, it fundamentally avoids the impact of inconsistent power-on timing and interference signals at the moment of insertion on the control system, significantly improving the stability of gas turbine card insertion and removal and the safety of system operation.

[0028] Furthermore, considering that the power supply voltage, positioning pin signals, and field sensor outputs may fluctuate briefly during transient operating conditions such as start-up, shutdown, and load shedding of the gas turbine, this invention also includes a mechanism for identifying and adaptively adjusting the gas turbine's operating conditions to avoid misjudgments or abnormal data reporting caused by operating condition disturbances. Specifically: The system motherboard reads the gas turbine's operating status or key process parameters (such as exhaust temperature change rate) in real time from the controller via a communication interface to determine whether the current operating condition is transient. The transient operating conditions include, but are not limited to: gas turbine start-up phase, shutdown phase, rapid load shedding phase, or phase with a large load jump.

[0029] When the gas turbine is detected to be in a transient operating condition, the system motherboard automatically extends the preset delay time after the initial power-on, for example, by adding an increment to the original delay (e.g., the basic delay is 5 seconds, but it is extended to 8 or 10 seconds in the transient condition), or by directly switching to a preset long delay value (e.g., 10 seconds). Once the operating condition identification module detects that the gas turbine has entered steady-state operation (e.g., the load change rate is lower than the set threshold, and the exhaust temperature fluctuation tends to be smooth), the system motherboard automatically restores the original preset delay parameters.

[0030] Through the above-mentioned operating condition adaptation adjustments, the present invention can effectively avoid interference from voltage fluctuations, mechanical vibrations, or signal jitter during the transient process of the gas turbine on the power-on judgment of the card and the initial data reporting, thereby further improving the reliability of data acquisition and the robustness of the control system.

[0031] The above description is only a part or preferred embodiment of the present invention. Neither the text nor the drawings should limit the scope of protection of the present invention. All equivalent structural transformations made using the content of the present invention's specification and drawings under the overall concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A method for controlling the stability of gas turbine component insertion and removal, characterized in that, Includes the following steps: S1. Detect the power supply status of the system motherboard and the field daughterboard after the detection card is inserted into the base; S2. When both power supplies are normal, detect the positioning pin signal set between the card and the base. The positioning pin signal is used to indicate whether the card is inserted into place. S3. When both power supplies are normal and the positioning pin signal is valid multiple times in a row, confirm that the card has been reliably inserted and is powered on stably. S4. After the initial power-on confirmation, a delayed reporting is performed, and the collected field data is reported to the controller after a preset delay. Subsequent data reports will not be subject to the delay. S5. If the power supply is abnormal or the positioning pin signal is invalid after multiple consecutive sampling confirmations, the data buffer should not be refreshed and the controller should maintain the valid data from the previous moment.

2. The method for controlling the stability of gas turbine component insertion and removal according to claim 1, characterized in that, In step S1, the power supply status of the system motherboard and the field daughterboard after the detection card is inserted into the base specifically includes: collecting the power supply voltage of the system motherboard and the power supply voltage of the field daughterboard respectively. When both voltages are within the rated operating range and the fluctuation is less than the preset deviation within a preset time, it is determined that the power supply is normal.

3. The method for controlling the stability of gas turbine component insertion and removal according to claim 1, characterized in that, Before step S2, if any power supply is abnormal, the system motherboard enters a waiting state, does not perform positioning pin signal detection, and periodically retryes power supply detection until the power supply is normal or an alarm is triggered due to timeout.

4. The method for controlling the stability of gas turbine component insertion and removal according to claim 1, characterized in that, In step S3, the positioning pin signal is valid multiple times consecutively. Specifically, this includes sampling the positioning pin level signal multiple times consecutively. If all samples are valid levels after a preset number of samplings, the signal is determined to be valid. If any sample is invalid, the sampling count is reset to zero and the signal is resampled.

5. The method for controlling the stability of gas turbine component insertion and removal according to claim 1, characterized in that, In step S4, the preset delay varies depending on the type of board. Specifically, the delay time of analog input boards is longer than that of digital input boards, and the delay time of digital input boards is longer than that of output boards.

6. The method for controlling the stability of gas turbine component insertion and removal according to claim 1, characterized in that, In step S4, the preset delay is adaptively calculated based on the ramp-up slope of the field sub-board power supply voltage: the time required for the field sub-board power supply voltage to rise from a first preset percentage to a second preset percentage is collected. The preset delay is determined based on the weighted sum of the base delay and the time required for the field sub-board power supply voltage to rise from the first preset percentage to the second preset percentage. The preset delay = base delay + k × T_slope, where k is a proportionality coefficient and T_slope is the time required for the field sub-board power supply voltage to rise from the first preset percentage to the second preset percentage. The preset delay is adaptively adjusted according to the gas turbine operating conditions, extending the delay time under transient conditions and restoring the original delay under steady-state conditions.

7. The method for controlling the stability of gas turbine component insertion and removal according to claim 1, characterized in that, The method also includes the determination of the first power-on: maintaining a non-volatile flag bit, when the positioning pin signal is invalid after multiple consecutive samplings, and is confirmed to be valid after multiple consecutive samplings again, it is regarded as a new insertion event, and the delayed reporting is performed again, and the collected field data is reported to the controller after a preset delay.

8. The method for controlling the stability of gas turbine component insertion and removal according to claim 1, characterized in that, The method also includes confirmation and retransmission after data reporting: the reported data frame carries a check code, and if no response is received from the controller within a specified time, the current data frame is retransmitted. After reaching the retransmission limit, the communication fault flag is set and the valid data from the previous moment is maintained.

9. The method for controlling the stability of gas turbine component insertion and removal according to claim 1, characterized in that, The positioning pin is located between the card and the base. The positioning pin contains at least two independent channels. The signal output terminal of each channel is connected to different signal acquisition ports of the system motherboard. The system motherboard determines that the positioning pin signal is valid only when all channels have been sampled multiple times consecutively. If any channel is invalid, it is determined to be invalid and triggers a card loosening alarm.

10. The method for controlling the stability of gas turbine component insertion and removal according to claim 1, characterized in that, The method also includes a dynamic response to the loss of the positioning pin: during normal operation, if the positioning pin signal is sampled invalidly multiple times in a row, the data buffer is immediately frozen and the valid data of the previous moment is maintained, while triggering a card loosening alarm.

Images