A method and device for protecting a gas turbine based on an anti-surge valve feedback signal

Abstract

The application discloses a gas turbine protection control method and device based on anti-surge valve feedback signals, and the method comprises the following steps: obtaining the opening stroke feedback signal, the first closing stroke feedback signal and the second closing stroke feedback signal of each anti-surge valve in the gas turbine, and judging whether signal abnormalities occur; when it is determined that at least two signals have signal abnormalities and the anti-surge valve needs to be closed, the output of the target closing stroke feedback signal is interrupted, so that the MK VIe control unit of the gas turbine triggers the GE9F gas turbine to perform a protection action when the target closing stroke feedback signal is not received. Through the implementation of the application, the interference of the closing stroke feedback signal corresponding to the closing stroke switch caused by environmental reasons can be effectively prevented, the MK VIe control unit of the gas turbine is prevented from being incorrectly triggered to cause unsafe accidents such as automatic shutdown, automatic load reduction and automatic tripping of the gas turbine during operation, the reliability of equipment operation is improved, and safe operation of the unit is ensured.

Description

Technical Field

[0001] This invention relates to the field of gas turbine protection and control, and in particular to a gas turbine protection and control method and device based on anti-surge valve feedback signal. Background Technology

[0002] In recent years, the GE9F gas turbine has repeatedly triggered major safety hazards such as automatic shutdown, automatic load reduction, and unit tripping during operation due to defects such as interference or malfunction of the anti-surge valve's closing stroke feedback signal, causing significant economic losses to power generation companies. The main reason is that the anti-surge valve's field equipment operates in harsh environments with high temperatures and significant vibrations. Furthermore, each anti-surge valve in a conventional GE9F gas turbine has only one closing stroke switch, and the triggering of protective actions is determined by the closing stroke feedback signal from this single switch. This can easily lead to interference with the closing stroke feedback signal, causing abnormal signals. The gas turbine's MK VIe control unit then automatically triggers protective actions, resulting in unsafe accidents such as automatic shutdown, automatic load reduction, and automatic tripping during operation. Summary of the Invention

[0003] This invention provides a gas turbine protection control method and device based on anti-surge valve feedback signal, which can effectively prevent interference with the end-of-stroke feedback signal corresponding to the end-of-stroke switch caused by environmental factors, which could lead to unsafe accidents such as automatic shutdown, automatic load reduction and automatic tripping of the gas turbine due to erroneous triggering of the gas turbine's MK VIe control unit during operation.

[0004] This invention provides a gas turbine protection control method based on anti-surge valve feedback signals, applicable to a 3-to-2 logic control unit. The 3-to-2 logic control unit is connected to a first terminal board, a second terminal board, a third terminal board, and a gas turbine MK VIe control unit. The first terminal board is connected to each open limit switch of each anti-surge valve in the gas turbine; the second terminal board is connected to each first closed limit switch of each anti-surge valve in the gas turbine; and the third terminal board is connected to each second closed limit switch of each anti-surge valve in the gas turbine.

[0005] The method includes: acquiring the open stroke feedback signal corresponding to the open stroke switch of each anti-surge valve in the gas turbine, the first closed stroke feedback signal corresponding to the first closed stroke switch, and the second closed stroke feedback signal corresponding to the second closed stroke switch;

[0006] The system determines whether any signal abnormalities occur in the opening stroke feedback signal, the first closing stroke feedback signal, and the second closing stroke feedback signal corresponding to each anti-surge valve. If at least two signals are found to be normal and the anti-surge valve needs to be closed, a target closing stroke feedback signal is output to the gas turbine MK VIe control unit. If at least two signals are found to be abnormal and the anti-surge valve needs to be closed, the output of the target closing stroke feedback signal is interrupted, so that the gas turbine MKVIe control unit triggers the GE9F gas turbine to perform a protection action when it does not receive the target closing stroke feedback signal.

[0007] Furthermore, after determining whether any signal abnormalities occur in the opening stroke feedback signal, the first closing stroke feedback signal, and the second closing stroke feedback signal corresponding to each anti-surge valve, the process also includes:

[0008] When at least one of the first and second stage travel feedback signals is found to be abnormal, an alarm signal is output to the gas turbine MK VIe control unit, so that the gas turbine MK VIe control unit triggers the alarm to issue a fault alarm based on the alarm signal.

[0009] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments;

[0010] This invention provides a gas turbine protection control device based on anti-surge valve feedback signals, comprising: a first terminal board, a second terminal board, a third terminal board, a 3-to-2 logic control unit, a gas turbine MK VIe control unit, each open limit switch corresponding to each anti-surge valve, each first closed limit switch corresponding to each anti-surge valve, and each second closed limit switch corresponding to each anti-surge valve.

[0011] Each open limit switch corresponding to each anti-surge valve is connected to the first terminal board; each first closed limit switch corresponding to each anti-surge valve is connected to the second terminal board; each second closed limit switch corresponding to each anti-surge valve is connected to the third terminal board; the first terminal board, the second terminal board, and the third terminal board are connected to the three-to-two logic control unit; the three-to-two logic control unit is connected to the gas turbine MK VIe control unit;

[0012] The first terminal board is used to acquire the open stroke feedback signal corresponding to each open limit switch and send it to the three-to-two logic control unit; the second terminal board is used to acquire the first closed open stroke feedback signal corresponding to each first closed limit switch and send it to the three-to-two logic control unit; the third terminal board is used to acquire the second open stroke feedback signal corresponding to each second closed limit switch and send it to the three-to-two logic control unit.

[0013] The three-to-two logic control unit is used to determine whether there is a signal abnormality in the opening stroke feedback signal, the first closing stroke feedback signal, and the second closing stroke feedback signal corresponding to each anti-surge valve. When it is determined that at least two signals are not abnormal and the anti-surge valve needs to be closed, the target closing stroke feedback signal is output and sent to the gas turbine MK VIe control unit. When it is determined that at least two signals are abnormal and the anti-surge valve needs to be closed, the output of the target closing stroke feedback signal is interrupted.

[0014] The gas turbine MK VIe control unit is used to trigger the GE9F gas turbine to perform protection actions when no target shut-off feedback signal is received.

[0015] Furthermore, the three-to-two logic control unit, after determining whether any signal abnormality occurs in the open stroke feedback signal, the first closed stroke feedback signal, and the second closed stroke feedback signal corresponding to each anti-surge valve, is also used for:

[0016] When at least one of the first and second stage travel feedback signals is found to be abnormal, an alarm signal is output to the gas turbine MK VIe control unit, so that the gas turbine MK VIe control unit triggers the alarm to issue a fault alarm based on the alarm signal.

[0017] The embodiments of the present invention have the following beneficial effects:

[0018] This invention provides a gas turbine protection control method and device based on anti-surge valve feedback signals. The method adds a closing limit switch to each existing anti-surge valve in the gas turbine, so that each anti-surge valve has an opening limit switch, a first closing limit switch, and a second closing limit switch. For each anti-surge valve, after obtaining the control command information of the gas turbine's anti-surge valve, it determines whether there is an abnormal signal among the opening, first, and second closing limit feedback signals corresponding to the three limit switches. By adopting a "three-choose-two" logic control method, the gas turbine will only be triggered to perform a protection action when at least two signals are determined to be abnormal. This effectively prevents interference with the closing limit feedback signal corresponding to the closing limit switch due to environmental factors, which could lead to the gas turbine's MK VIe control unit erroneously triggering unsafe accidents such as automatic shutdown, automatic load reduction, and automatic tripping during operation. Attached Figure Description

[0019] Figure 1 This is a schematic flowchart of a gas turbine protection control method based on anti-surge valve feedback signal provided in an embodiment of the present invention;

[0020] Figure 2This is a schematic diagram of the structure of a gas turbine protection control device based on anti-surge valve feedback signal according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of a normal state of the off-stroke feedback logic provided in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram illustrating a method for representing a normal state of the off-stroke feedback logic according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the off-stroke feedback logic when the first off-stroke feedback signal is abnormal, provided in an embodiment of the present invention;

[0024] Figure 6 This is a schematic diagram of the off-stroke feedback logic when the second off-stroke feedback signal is abnormal, provided in an embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the closing stroke feedback logic when the opening stroke feedback signal is abnormal, provided in an embodiment of the present invention;

[0026] Figure 8 This is a schematic diagram of the alarm feedback logic under normal conditions provided in an embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the alarm feedback logic when the first stroke feedback signal is abnormal, provided in an embodiment of the present invention;

[0028] Figure 10 This is a schematic diagram of the alarm feedback logic when the second stroke feedback signal is abnormal, provided in an embodiment of the present invention;

[0029] Figure 11 This is a schematic diagram of the alarm feedback logic when the first stroke feedback signal of another anti-surge valve is abnormal, provided in one embodiment of the present invention;

[0030] Figure 12 This is a schematic diagram of the alarm feedback logic when the second stroke feedback signal of another anti-surge valve is abnormal, provided in one embodiment of the present invention;

[0031] Figure 13 This is a schematic diagram of the generator anti-surge valve feedback unit before and after modification according to an embodiment of the present invention;

[0032] Figure 14 This is a schematic diagram of the newly added anti-surge valve protection logic structure in the MK VIe logic provided in an embodiment of the present invention. Detailed Implementation

[0033] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] like Figure 1 As shown in the figure, one embodiment provides a gas turbine protection control method based on anti-surge valve feedback signals, applicable to a three-to-two logic control unit. The three-to-two logic control unit is connected to a first terminal board, a second terminal board, a third terminal board, and a gas turbine MK VIe control unit, respectively. The first terminal board is connected to each open limit switch of each anti-surge valve in the gas turbine; the second terminal board is connected to each first closed limit switch of each anti-surge valve in the gas turbine; and the third terminal board is connected to each second closed limit switch of each anti-surge valve in the gas turbine.

[0035] The method includes:

[0036] Step S101: Obtain the opening stroke feedback signal corresponding to the opening stroke switch of each anti-surge valve in the gas turbine, the first closing stroke feedback signal corresponding to the first closing stroke switch, and the second closing stroke feedback signal corresponding to the second closing stroke switch;

[0037] Step S102: Determine whether any signal abnormality occurs in the opening stroke feedback signal, the first closing stroke feedback signal, and the second closing stroke feedback signal corresponding to each anti-surge valve. If at least two signals are found to be normal and the anti-surge valve needs to be closed, output the target closing stroke feedback signal to the gas turbine MK VIe control unit. If at least two signals are found to be abnormal and the anti-surge valve needs to be closed, interrupt the output of the target closing stroke feedback signal so that the gas turbine MK VIe control unit triggers the GE9F gas turbine to perform a protection action when it does not receive the target closing stroke feedback signal.

[0038] For step S101, in a preferred embodiment, the gas turbine includes, but is not limited to, the GE9F gas turbine;

[0039] Four anti-surge valves are installed on the GE9F gas turbine. A pair of closed limit switches is added to each of the four anti-surge valves of the original GE9F gas turbine. The signals are sent to the MK VIe logic for the reference of the three-to-two protection logic. The feedback signals of the original fully open and fully closed limit switches are no longer used. The original open limit switch, closed limit switch and the newly added closed limit switch are combined to determine the anti-surge valve protection control logic. That is, the open limit feedback signal corresponding to the open limit switch of each anti-surge valve in the GE9F gas turbine, the first closed limit feedback signal corresponding to the first closed limit switch and the second closed limit feedback signal corresponding to the second closed limit switch are obtained.

[0040] In a preferred embodiment, for step S102, after obtaining the open stroke feedback signal, the first closed stroke feedback signal, and the second closed stroke feedback signal, it is determined whether there is a signal abnormality in the open stroke feedback signal, the first closed stroke feedback signal, and the second closed stroke feedback signal corresponding to each anti-surge valve. When it is determined that at least two signals are not abnormal and the anti-surge valve needs to be closed, a target closed stroke feedback signal is output to the gas turbine MK VIe control unit. When it is determined that at least two signals are abnormal and the anti-surge valve needs to be closed, the output of the target closed stroke feedback signal is interrupted, so that the gas turbine MK VIe control unit triggers the GE9F gas turbine to perform a protection action when it does not receive the target closed stroke feedback signal.

[0041] In a preferred embodiment, after determining whether any signal abnormality occurs in the opening stroke feedback signal, the first closing stroke feedback signal, and the second closing stroke feedback signal corresponding to each anti-surge valve, the method further includes:

[0042] When at least one of the first and second stage travel feedback signals is found to be abnormal, an alarm signal is output to the gas turbine MK VIe control unit, so that the gas turbine MK VIe control unit triggers the alarm to issue a fault alarm based on the alarm signal.

[0043] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments.

[0044] like Figure 2 As shown, an embodiment of the present invention provides a gas turbine protection control device based on anti-surge valve feedback signal, including: a first terminal board, a second terminal board, a third terminal board, a three-to-two logic control unit, a gas turbine MK VIe control unit, each open limit switch corresponding to each anti-surge valve, each first closed limit switch corresponding to each anti-surge valve, and each second closed limit switch corresponding to each anti-surge valve.

[0045] Each open limit switch corresponding to each anti-surge valve is connected to the first terminal board; each first closed limit switch corresponding to each anti-surge valve is connected to the second terminal board; each second closed limit switch corresponding to each anti-surge valve is connected to the third terminal board; the first terminal board, the second terminal board, and the third terminal board are connected to the three-to-two logic control unit; the three-to-two logic control unit is connected to the gas turbine MK VIe control unit;

[0046] The first terminal board is used to acquire the open stroke feedback signal corresponding to each open limit switch and send it to the three-to-two logic control unit; the second terminal board is used to acquire the first closed open stroke feedback signal corresponding to each first closed limit switch and send it to the three-to-two logic control unit; the third terminal board is used to acquire the second open stroke feedback signal corresponding to each second closed limit switch and send it to the three-to-two logic control unit.

[0047] The three-to-two logic control unit is used to determine whether there is a signal abnormality in the opening stroke feedback signal, the first closing stroke feedback signal, and the second closing stroke feedback signal corresponding to each anti-surge valve. When it is determined that at least two signals are not abnormal and the anti-surge valve needs to be closed, the target closing stroke feedback signal is output and sent to the gas turbine MK VIe control unit. When it is determined that at least two signals are abnormal and the anti-surge valve needs to be closed, the output of the target closing stroke feedback signal is interrupted.

[0048] The gas turbine MK VIe control unit is used to trigger the GE9F gas turbine to perform protection actions when no target shut-off feedback signal is received.

[0049] In a preferred embodiment, the gas turbine protection control device based on anti-surge valve feedback signals, after determining whether any signal abnormality occurs in the open stroke feedback signal, the first closed stroke feedback signal, and the second closed stroke feedback signal corresponding to each anti-surge valve, is further configured to:

[0050] When at least one of the first and second stage travel feedback signals is found to be abnormal, an alarm signal is output to the gas turbine MK VIe control unit, so that the gas turbine MK VIe control unit triggers the alarm to issue a fault alarm based on the alarm signal.

[0051] Specifically, such as Figure 3As shown, a pair of closed limit switch feedback signals are added to the original feedback units of the anti-surge valves #1, #2, #3, and #4 of the gas turbine, and the new feedback signals are connected to the MK VIe control terminal board. This is mainly used for the three-to-two logic judgment protection output of the anti-surge valve. The alarm is a type of alarm installed in the gas turbine, and can be any existing type; this invention does not specifically limit it. The MK VIe control unit is a logic control unit unique to the GE9F gas turbine, belonging to existing technology; this invention also does not specifically limit it.

[0052] The input feedback signals for the #1, 2, 3, and 4 anti-surge valve limit switches in the original MK VIe logic, as well as the newly added limit switch input feedback signals, are recoded. The newly added limit switch input feedback signal codes are: l33cb5c_2, l33cb6c_2, l33cb7c_2, and l33cb8c_2. The original four limit switch signal points for the anti-surge valves (l33cb5c, l33cb6c, l33cb7c, and l33cb8c) are renamed to l33cb5c_1, l33cb6c_1, l33cb7c_1, and l33cb8c_1. The original code for the #1, 2, 3, and 4 anti-surge valve limit switch input feedback signals (l33cb5o, l33cb6o, l33cb7o, and l33cb8o) in the original MK VIe logic remains unchanged.

[0053] When the #1 anti-surge valve requires closure, if either or both of the closing stroke feedback signals l33cb5c_1 (Compressor Bleed Valve #1_1 Closed) and l33cb5c_2 (Compressor Bleed Valve #1_2 Closed) fail (neither switch signal is closed), the MK VIe logic #1 anti-surge valve closing stroke feedback signal fault lcb5_6Closed_ALM (#1, 2 COMPRESSOR BLEED VALVE CLOS POSITION TROUBLE) will trigger an alarm, reminding operation and maintenance personnel to check and handle the issue promptly. Similarly, when the #1 anti-surge valve requires closure, if the closing stroke feedback signals of l33cb5c_1 (Compressor Bleed Valve #1_1 Closed) and l33cb5c_2 (Compressor Bleed Valve #1_2 Closed) both fail (neither switch signal is closed), or if either of the two closing stroke feedback signals of l33cb5c_1 or l33cb5c_2 fails simultaneously with the opening stroke feedback signal of l33cb1o, then the MK VIe logic outputs a fault alarm for the #1 anti-surge valve closing stroke feedback signal (lcb5_6Closed_ALM). At the same time, the three-to-two protection logic triggers the disconnection of the closing stroke feedback signal output of l33cb5c (Compressor Bleed Valve #1 Closed) #1 anti-surge valve, and the unit executes a protection action; the feedback triggering principle for other anti-surge valves is the same.

[0054] Indicative, such as Figure 3 As shown, l33cb6c_1 (first-stage stroke feedback signal), l33cb6c_2 (closed stroke feedback signal (first-stage stroke feedback signal)), l33cb2o (open stroke feedback signal); during normal unit operation, the anti-surge valve must be fully closed. A: l33cb6c_1 and B: l33cb6c_2 closed stroke feedback signals are triggered and connected, C: l33cb2o open stroke feedback signal is disconnected (inverting this means that after the signal is disconnected, the logic is connected).

[0055] When the unit is running normally, and the anti-surge valve is required to be fully closed, the logic is normal, and logics AC, BC, and AB are all connected in the module. OUT: The signal l33cb6c sends a logic value of 1, so the protection does not activate; the dark box in the diagram indicates that it is activated.

[0056] like Figure 4As shown, when A: l33cb6c_1 malfunctions or is interfered with, the first-stage travel feedback signal of l33cb6c_1 is not connected, the GE9F gas turbine MK VIe logic issues an alarm, AC and AB in the logic module are disconnected, but the protection action is not triggered because BC in the module is connected. Therefore, the l33cb6c signal is sent to logic 1, that is, the target travel feedback signal is issued, but the gas turbine is not triggered to execute the protection action.

[0057] Similarly, such as Figure 5 and Figure 6 As shown, when the second-stage stroke feedback signal of l33cb6c_2 fails or is interfered with, the logic module has AC connected; when the first-stage stroke feedback signal of l33cb2o fails or is interfered with, the logic module has AB connected. In both cases, the l33cb6c signal is sent to logic 1, that is, the target stroke feedback signal is issued, and the gas turbine is not triggered to perform protection action.

[0058] For the logic of triggering alarms: such as Figure 7 As shown, when no alarm is triggered, after L20CBZ (anti-surge valve closing delay signal) arrives, the following feedback signals are generated for anti-surge valves #1 and #2: A: 33cb5c_1 (represents the first closing stroke feedback signal of anti-surge valve #1; the slash indicates signal inversion, meaning the logic is off after the signal is on), B: l33cb5c_2 (the second closing stroke feedback signal of anti-surge valve #1), C: L20CBZ (connected after the anti-surge valve closing delay signal arrives, indicated by a dark box in the diagram), D: 33cb6c_1 (represents the first closing stroke feedback signal of anti-surge valve #2), and E: l33cb6c_2 (represents the second closing stroke feedback signal of anti-surge valve #2).

[0059] like Figure 8 As shown, during normal unit operation, if: A: l33cb5c_1 (#1 anti-surge valve first closing stroke feedback signal) malfunctions or is interfered with; A: l33cb5c_1 in the logic module is activated. C is also activated, so AC is activated, and an alarm signal lcb5_6Closed_ALM (#1, 2 COMPRESSOR BLEED VALVE CLOS POSITION TROUBLE) is output. The MK VIe logic triggers the alarm to issue a fault alarm based on the alarm signal, reminding operation and maintenance personnel to check and handle the problem promptly. Similarly, if... Figure 9-12 As shown, when any other signal fails or interferes, the alarm signal lcb5_6Closed_ALM is output.

[0060] In an optional embodiment, the key point of this protection control logic is to add a pair of closed limit switches to each of the original four signal feedback units of the gas turbine's #1, 2, 3, and 4 anti-surge valves. The combination of the original open and closed limit switches with the newly added closed limit switches determines the anti-surge valve protection control logic, effectively preventing unsafe accidents caused by erroneous control signals from the gas turbine's anti-surge valves. Figure 13 As shown.

[0061] The MK VIe logic G / software / Programs / CUSTOM project is a specific control structure diagram for the MK VIe logic of the GE9F gas turbine. Four additional limit switch signals for the gas turbine's #1, #2, #3, and #4 anti-surge valves are sent to the MK VIe control terminal block. When any limit switch feedback signal for the gas turbine's #1, #2, #3, and #4 anti-surge valves malfunctions, an alarm signal is issued, alerting operators and maintenance personnel to promptly eliminate equipment defects.

[0062] Under the GE9F gas turbine MK VIe logic BLEEDVALVE (COMPRESSOR BLEED VALVE FAILURE Two out of Three Protection Logic) project, add a two-out-of-three protection logic for the gas turbine anti-surge valve limit switch feedback signal fault. Add four new limit switch signal points (l33cb5c_2, l33cb6c_2, l33cb7c_2, l33cb8c_2) to the PDIO channel of the gas turbine MK VIe I / O card, and rename the original limit switch signal points on the four anti-surge valve I / O card PDIO channels to l33cb5c_1, l33cb6c_1, l33cb7c_1, and l33cb8c_1. The original MK VIe logic retains l33cb5c, l33cb6c, l33cb7c, and l33cb8c as the protection points for the #1, 2, 3, and 4 anti-surge valve closing stroke feedback signals, while the original trigger protection logic of the subsequent MK VIe remains unchanged.

[0063] Optional, such as Figure 14As shown, the logic structure for adding BLEEDVALVE is added under the MK VIe logic project G / software / Programs / CUSTOM of the GE9F gas turbine. This newly added anti-surge valve protection logic structure is a specific control structure diagram for the GE9F gas turbine MK VIe logic. It adds four end-stroke feedback switch signals for the #1, #2, #3, and #4 anti-surge valves of the GE9F gas turbine, all of which are sent to the MK VIe logic to determine the output signal of the three-in-two anti-surge valve protection logic. It also references the logic configuration structure within the anti-surge valve protection logic. The newly added points are all points required for this addition of the GE9F gas turbine anti-surge valve three-in-two protection logic, including the end-stroke switches and measurement signal points of the newly added field #1, #2, #3, and #4 anti-surge valve feedback units. These are crucial for the gas turbine anti-surge valve three-in-two protection logic to determine whether it can operate normally. If a single gas turbine anti-surge valve limit switch feedback signal malfunctions, the MK VIe logic will output an alarm, prompting operation and maintenance personnel to promptly inspect the system. The proper functioning or malfunction of each gas turbine anti-surge valve is determined by a three-to-two logic combination of two pairs of closed limit switches and one pair of open limit switches. The MK VIe protection logic references this judgment to trigger the unit's Shutdown, Runback, and Trip logics. This three-to-two logic is a key aspect of this technical solution. This logic effectively prevents unit tripping accidents caused by unreasonable or simplistic design of the gas turbine anti-surge valve closing limit switch feedback signal.

[0064] By implementing the above embodiments of the present invention, interference with the feedback signal corresponding to the limit switch caused by environmental factors can be effectively prevented, which could lead to unsafe accidents such as automatic shutdown, automatic load reduction, and automatic tripping of the gas turbine due to erroneous triggering of the gas turbine's MK VIe control unit during operation. This improves the reliability of equipment operation and ensures the safe operation of the unit.

[0065] The above description represents the preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications are also considered to be protected by the present invention.

Claims

1. A gas turbine protection control method based on anti-surge valve feedback signal, applicable to a three-to-two logic control unit, characterized in that, The three-to-two logic control unit is connected to the first terminal board, the second terminal board, the third terminal board, and the gas turbine MKVIe control unit, respectively; the first terminal board is connected to each open limit switch of each anti-surge valve in the gas turbine; the second terminal board is connected to each first closed limit switch of each anti-surge valve in the gas turbine. The third terminal block is connected to the second limit switch of each anti-surge valve in the gas turbine; The method includes: acquiring the open stroke feedback signal corresponding to the open stroke switch of each anti-surge valve in the gas turbine, the first closed stroke feedback signal corresponding to the first closed stroke switch, and the second closed stroke feedback signal corresponding to the second closed stroke switch; The system determines whether any signal abnormalities occur in the opening stroke feedback signal, the first closing stroke feedback signal, and the second closing stroke feedback signal corresponding to each anti-surge valve. If at least two signals are found to be normal and the anti-surge valve needs to be closed, a target closing stroke feedback signal is output to the gas turbine MK VIe control unit. If at least two signals are found to be abnormal and the anti-surge valve needs to be closed, the output of the target closing stroke feedback signal is interrupted, so that the gas turbine MK VIe control unit triggers the GE9F gas turbine to perform a protection action when it does not receive the target closing stroke feedback signal.

2. The gas turbine protection control method based on anti-surge valve feedback signal as described in claim 1, characterized in that, After determining whether any signal abnormalities occur in the opening stroke feedback signal, the first closing stroke feedback signal, and the second closing stroke feedback signal corresponding to each anti-surge valve, the process also includes: When at least one of the first and second stage travel feedback signals is found to be abnormal, an alarm signal is output to the gas turbine MK VIe control unit, so that the gas turbine MK VIe control unit triggers the alarm to issue a fault alarm based on the alarm signal.

3. A gas turbine protection control device based on anti-surge valve feedback signal, characterized in that, include: First terminal board, second terminal board, third terminal board, three-to-two logic control unit, gas turbine MK VIe control unit, each open limit switch corresponding to each anti-surge valve, each first closed limit switch corresponding to each anti-surge valve, and each second closed limit switch corresponding to each anti-surge valve; Each anti-surge valve's corresponding open limit switch is connected to the first terminal board; each anti-surge valve's corresponding first closed limit switch is connected to the second terminal board; each anti-surge valve's corresponding second closed limit switch is connected to the third terminal board; the first terminal board, second terminal board, and third terminal board are connected to the 3-to-2 logic control unit; the 3-to-2 logic control unit is connected to the gas turbine MK VIe control unit. The first terminal board is used to acquire the open stroke feedback signal corresponding to each open limit switch and send it to the three-to-two logic control unit; the second terminal board is used to acquire the first closed open stroke feedback signal corresponding to each first closed limit switch and send it to the three-to-two logic control unit; the third terminal board is used to acquire the second open stroke feedback signal corresponding to each second closed limit switch and send it to the three-to-two logic control unit. The three-to-two logic control unit is used to determine whether there is a signal abnormality in the opening stroke feedback signal, the first closing stroke feedback signal, and the second closing stroke feedback signal corresponding to each anti-surge valve. When it is determined that at least two signals are not abnormal and the anti-surge valve needs to be closed, the target closing stroke feedback signal is output and sent to the gas turbine MK VIe control unit. When it is determined that at least two signals are abnormal and the anti-surge valve needs to be closed, the output of the target closing stroke feedback signal is interrupted. The gas turbine MK VIe control unit is used to trigger the GE9F gas turbine to perform protection actions when no target shut-off feedback signal is received.

4. The gas turbine protection and control device based on anti-surge valve feedback signal as described in claim 3, characterized in that, The three-to-two logic control unit, after determining whether any signal abnormality occurs in the opening stroke feedback signal, the first closing stroke feedback signal, and the second closing stroke feedback signal corresponding to each anti-surge valve, is further used for: When at least one of the first and second stage travel feedback signals is found to be abnormal, an alarm signal is output to the gas turbine MK VIe control unit, so that the gas turbine MK VIe control unit triggers the alarm to issue a fault alarm based on the alarm signal.

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