Emergency trip method and system for steam turbine test switching

Abstract

The invention discloses an emergency trip method and system for steam turbine test switching, and relates to the technical field of power equipment safety control, and the method comprises the steps: building a redundant solenoid valve control loop, and initializing a switching logic structure; based on the hanging gate logic structure, a test hanging gate control instruction is sent out, and the health state of a hanging gate loop is monitored in real time; and according to the healthy state of the hanging gate loop, emergency trip action is executed, and safe shutdown of the steam turbine is completed. According to the method, the structural redundancy and fault tolerance design of the switching execution path is realized, the risk of interruption failure caused by a single-point fault of the electromagnetic valve is reduced from the source, and the stability and the structural reliability of a switching control system are remarkably improved; according to the method, a hanging gate loop health state evaluation mechanism is established, the accuracy of judgment before interruption is effectively improved, dynamic matching of hanging gate control logic and an execution mechanism is achieved, and finally the quick response capacity and the safe shutdown effect of a steam turbine under sudden abnormity or safety requirements are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment safety control, in particular to an emergency tripping method and system for a steam turbine test trip. Background Art

[0002] In modern thermal power generation systems, steam turbines are the core equipment for converting thermal energy into mechanical energy. Their safe and stable operation is directly related to the overall unit's operating efficiency and safety. With the continuous optimization of energy structures and the improvement of unit automation, various auxiliary steam turbines (such as induced draft fan turbines and feedwater pump turbines) are increasingly used in small and medium-sized cogeneration systems. Effectively achieving rapid tripping and safe shutdown of these auxiliary turbines has become a key technical component in power plant operation assurance. Traditionally, steam turbine main steam valve tripping relies primarily on a combination of oil-operated mechanisms, manual tripping devices, and hydraulic actuators. In the event of an emergency or for testing and verification purposes, operators must manually shut down the main steam valves or trigger a tripping signal, which in turn closes the main steam valves and shuts down the unit. These methods rely heavily on operator proficiency, response timeliness, and circuit integrity, and carry a certain degree of potential for human intervention and misjudgment.

[0003] In recent years, with the increasing demand for intelligent power plant operation and increased safety, researchers and equipment manufacturers have begun exploring more automated and highly redundant tripping technology solutions. For example, some power plants have begun implementing electromagnetically controlled tripping systems, employing programmable logic controllers (PLCs) to manage solenoid valve status, enabling automatic triggering of tripping signals and feedback loop control, improving system response speed and automation. Simultaneously, redundant control architectures for complex operating conditions and unplanned fault handling have also gained increasing attention. In particular, in high-security scenarios, the use of multi-channel series-parallel solenoid valves to create redundant tripping paths has become a mainstream approach for improving system fault tolerance. However, current tripping systems in the industry still rely primarily on static configurations, lacking real-time assessment and health monitoring of tripping logic status. This can easily lead to problems such as solenoid valve failure and untimely identification of feedback signal anomalies, posing risks to the accuracy of tripping decisions. Furthermore, existing solutions primarily emphasize the execution mechanism of tripping control, but lack a systematic approach to integrating the closed-loop linkage mechanism of tripping logic judgment, fault diagnosis, and coordinated tripping actions. Furthermore, they lack modular and intelligent judgment and execution strategies, leaving significant technical gaps. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by the present invention is: the existing technical methods for controlling the main steam valve locking and emergency shutoff of steam turbines have the problems of poor reliability of the locking circuit, inability to identify the health status in real time, and lack of decision-making basis for triggering the shutoff action, resulting in low safety and insufficient automation level, as well as the problem of how to realize automatic judgment and shutoff linkage control based on test locking feedback under a multi-solenoid valve redundant structure.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a critical shut-off method for a test shut-off of a steam turbine, comprising establishing a redundant solenoid valve control loop and initializing a shut-off logic structure; issuing a test shut-off control instruction based on the shut-off logic structure and monitoring the health status of the shut-off circuit in real time; and executing an emergency shut-off action and completing a safe shutdown of the steam turbine according to the health status of the shut-off circuit.

[0007] As a preferred solution of the emergency tripping method for turbine test locking described in the present invention, the establishment of a redundant solenoid valve control circuit includes setting four energized normally closed solenoid valves as the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve.

[0008] The first solenoid valve and the third solenoid valve are connected in parallel to form a front channel, the second solenoid valve and the fourth solenoid valve are connected in parallel to form a rear channel, and the front channel and the rear channel are connected in series to form a redundant solenoid valve control loop.

[0009] As a preferred solution of the emergency tripping method for turbine test tripping described in the present invention, the initialization tripping logic structure includes setting a test tripping trigger interface, judging whether the four energized normally closed solenoid valves are in the initial closed state, the power supply status and feedback signal of the redundant solenoid valve control circuit, establishing the redundant solenoid valve control circuit status monitoring logic, configuring the fault diagnosis register in the initialization stage, and generating the current tripping logic status code.

[0010] As a preferred solution of the emergency tripping method for turbine test tripping described in the present invention, the issuing of the test tripping control instruction includes, after the tripping logic structure is initialized and the tripping logic status code is generated, activating the test tripping trigger interface, based on the tripping logic structure, sending a power-off control instruction to the redundant solenoid valve control circuit, disconnecting the power supply of all energized normally closed solenoid valves in the redundant solenoid valve control circuit, collecting the feedback signal of the energized normally closed solenoid valve, judging whether the test tripping action is completed, and automatically restoring the channel power supply according to the set strategy after the test tripping action is completed.

[0011] As a preferred solution of the emergency tripping method for turbine test tripping described in the present invention, the real-time monitoring of the health status of the tripping circuit includes, after the initialization of the tripping logic structure is completed, real-time collection of the power on-off status and feedback signal of the energized normally closed solenoid valve in the redundant solenoid valve control circuit, and judging the health status of the tripping circuit based on the feedback signal of the energized normally closed solenoid valve.

[0012] As a preferred embodiment of the emergency tripping method for turbine test tripping described in the present invention, the method of judging the health status of the tripping circuit based on the feedback signal of the energized normally closed solenoid valve includes comparing the response difference of the test tripping redundant solenoid valve control circuit. If the energized normally closed solenoid valve in the redundant solenoid valve control circuit feeds back to the disconnected state after the power-off instruction, the health status of the tripping circuit is judged to be normal, and a normal status flag code is generated.

[0013] If the normally closed solenoid valve in the redundant solenoid valve control circuit is fed back as not disconnected after the power-off command, the health status of the locking circuit is judged to be abnormal, and an abnormal status flag code is generated.

[0014] As a preferred embodiment of the emergency tripping method for turbine test locking described in the present invention, the execution of the emergency tripping action and completion of the safe shutdown of the turbine include, when the health status of the locking circuit is normal, disconnecting the power supply of the energized normally closed solenoid valve of the locking circuit, releasing the closed state of the hydraulic path, driving the main steam valve actuator to start the closing action, and during the closing process of the main steam valve, issuing an execution instruction to stop the oil supply of the oil motor, controlling the oil motor to stop hydraulic maintenance, and outputting a shutdown status mark after the main steam valve is completely closed and the pressure supply is terminated.

[0015] When the health status of the locking circuit is abnormal, the emergency tripping action is not performed, and a locking circuit abnormal status alarm signal is generated, and the current state feedback information of the solenoid valve is recorded to prompt manual intervention.

[0016] Another object of the present invention is to provide an emergency tripping system for turbine test tripping, which can solve the problems of structural dispersion, non-closed logic and lack of health status judgment mechanism in the current tripping control and tripping linkage technology by constructing a tripping structure module, a tripping circuit monitoring module and a tripping control and shutdown execution module.

[0017] As an optimal solution of the emergency trip system for turbine test tripping described in the present invention, it includes: building a tripping structure module, a tripping circuit monitoring module, and a tripping control and shutdown execution module; the tripping structure module includes a solenoid valve channel configuration unit and a tripping logic initialization unit, the solenoid valve channel configuration unit is used to configure four solenoid valves to form a front channel and a rear channel, and establish a redundant solenoid valve control circuit, the tripping logic initialization unit is used to collect the state of the energized normally closed solenoid valve and generate a tripping logic state code; the tripping circuit monitoring module includes a tripping test control unit and a circuit health status evaluation unit, the tripping test control unit is used to issue a test power-off instruction to the energized normally closed solenoid valve to simulate the tripping action, and the circuit health status evaluation unit is used to judge whether the tripping circuit is healthy based on the feedback of the energized normally closed solenoid valve; the tripping control and shutdown execution module includes a tripping execution control unit and a shutdown process confirmation unit, the tripping execution control unit is used to execute the main steam valve closing operation in a healthy state, and the shutdown process confirmation unit is used to confirm that the main steam valve is closed and completes the shutdown or triggers abnormal processing.

[0018] A computer device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of an emergency tripping method for a steam turbine test trip.

[0019] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of an emergency tripping method for a steam turbine test trip.

[0020] The beneficial effects of the present invention are as follows: by constructing a redundant solenoid valve control loop and initializing the gate-locking logic structure, clarifying the connection mode and status coding mechanism of the solenoid valve, the structural redundancy and fault-tolerant design of the gate-locking execution path are realized, which reduces the risk of tripping failure due to single-point failure of the solenoid valve from the source, and significantly improves the stability and structural reliability of the gate-locking control system; by issuing a test gate-locking control instruction based on the gate-locking logic structure, and combining the action feedback signal of each solenoid valve under control, a gate-locking circuit health status assessment mechanism is established, which enables the system to verify in advance whether the control path is in good working order before actual tripping. It is available, which effectively improves the accuracy of judgment before tripping, avoids blind execution of tripping operations under circuit abnormalities, and enhances the intelligent judgment ability of the control system and the safety of tripping decisions; by executing the tripping control instruction after the tripping circuit is judged to be in a healthy state, driving the main steam valve to close and the oil motor to stop supplying pressure, and combining the main steam valve position feedback and shutdown confirmation mechanism, constructing a closed-loop linkage control process of main steam valve tripping and system shutdown, realizing dynamic matching of the tripping control logic and the actuator, and ultimately improving the rapid response capability and safe shutdown effect of the turbine under sudden abnormalities or safety requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is an overall flow chart of an emergency tripping method for a steam turbine test shutdown provided in Example 1 of the present invention.

[0023] Figure 2 This is an overall schematic diagram of an emergency tripping system for steam turbine test operation provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0024] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0025] Example 1, reference Figure 1 , as one embodiment of the present invention, provides an emergency tripping method for a steam turbine test trip, comprising:

[0026] S1: Establish a redundant solenoid valve control loop and initialize the gate logic structure.

[0027] Furthermore, establishing a redundant solenoid valve control circuit includes providing four energized normally closed solenoid valves as a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve.

[0028] The first solenoid valve and the third solenoid valve are connected in parallel to form a front channel, the second solenoid valve and the fourth solenoid valve are connected in parallel to form a rear channel, and the front channel and the rear channel are connected in series to form a redundant solenoid valve control loop.

[0029] It should be noted that four normally closed solenoid valves, designated as the first, second, third, and fourth solenoid valves, were selected. The first and third solenoid valves were connected in parallel to form a front channel for path control before the gate is engaged; the second and fourth solenoid valves were connected in parallel to form a rear channel for subsequent path control. Subsequently, a closed-loop control structure was constructed between the front and rear channels in series, forming a redundant solenoid valve control circuit with a dual-channel structure and internal parallel configuration. In this redundant solenoid valve control circuit, if any solenoid valve in the front channel remains energized and closed, the entire channel remains conductive; if any solenoid valve in the rear channel is normally closed, the control path can also maintain an effective connection.

[0030] It should also be noted that by connecting the front channel (the first solenoid valve and the third solenoid valve in parallel) and the rear channel (the second solenoid valve and the fourth solenoid valve in parallel) in series to form a complete circuit, when any solenoid valve in a channel is in a normal closed state, the channel can be kept conductive, effectively avoiding the problem of failure of the entire locking path due to failure of a single solenoid valve, and enhancing the tolerance to single point failures.

[0031] Furthermore, the initialization of the gate logic structure includes setting the test gate trigger interface, judging whether the four normally closed solenoid valves are in the initial closed state, the power status and feedback signal of the redundant solenoid valve control circuit, establishing the redundant solenoid valve control circuit status monitoring logic, configuring the fault diagnosis register in the initialization stage, and generating the current gate logic status code.

[0032] It should be noted that the test lock trigger interface serves as the starting condition for logical judgment and status detection, initiating the state initialization process for the solenoid valve channel structure. This process identifies the status of the four energized normally closed solenoid valves in the redundant solenoid valve control circuit, reading each solenoid valve's power supply status and whether its feedback contact signal is closed, thereby determining whether each solenoid valve meets the initial closed operating condition requirements. The states of the front channel formed by the first and third solenoid valves and the rear channel formed by the second and fourth solenoid valves must be collected and independently determined. Based on preset logical conditions (for example, if any solenoid valve in a channel is closed, the channel is considered open), a logical combination calculation is performed on the front and rear channel states to generate a logical state code for the current lock control structure. During the initialization phase, the system also configures a fault diagnosis register to record currently collected abnormal solenoid valve status information, including issues such as non-closure, inconsistent feedback, and power supply anomalies. This information is written to the register as a bit mark for subsequent diagnostic module calls.

[0033] It should also be noted that by setting up a test gate trigger interface and collecting the power supply status and feedback signals of four energized normally closed solenoid valves during the initialization phase, the present invention not only completes the real-time collection of the on-off status of the gate circuit, but also further incorporates the logical relationship between the front channel and the rear channel into the system judgment range, and constructs a gate logic status code that can be used for subsequent control criteria. It not only identifies the integrity of the gate control path, but also constitutes a unified representation of the system's health of the gate circuit.

[0034] S2: Based on the gate logic structure, issue a test gate control command to monitor the health status of the gate circuit in real time.

[0035] Furthermore, issuing a test gate control instruction includes, after the gate logic structure is initialized and the gate logic status code is generated, activating the test gate trigger interface, sending a power-off control instruction to the redundant solenoid valve control circuit based on the gate logic structure, disconnecting the power supply of all energized normally closed solenoid valves in the redundant solenoid valve control circuit, collecting the feedback signal of the energized normally closed solenoid valve, judging whether the test gate action is completed, and automatically restoring the channel power supply according to the set strategy after the test gate action is completed.

[0036] It should be noted that by activating the test latch trigger interface, the latch circuit control process is initiated. Based on the layout of the front and rear channels in the latch logic structure, power-off control instructions are sent to all energized normally closed solenoid valves in the front and rear channels, respectively, causing each energized normally closed solenoid valve to be de-energized and closed. This creates a simulated latch environment, collects the de-energized status and feedback signals of each energized normally closed solenoid valve in real time, and determines whether each channel complies with the latch closure logic, thereby determining whether the test latch action has been successfully completed. When the system determines that the feedback status of the front and rear channels both meet the conditions set in the latch logic structure, the test latch action is considered complete.

[0037] A preferred option for setting the strategy is to set a fixed delay time (for example, 1 to 3 seconds) and then the system automatically restores power to the front channel and the rear channel. This is suitable for fast verification test processes. After the test is completed, a fixed delay time (such as 1 to 3 seconds) is set to automatically restore power to the front channel and the rear channel. No manual intervention or additional judgment logic is required, which can greatly reduce the complexity of the system response process. In daily operation and maintenance or equipment debugging, it is often necessary to perform fast verification test switching operations. Setting the strategy can ensure that the system is automatically restored to its original state in a short time after the switching action is completed, which facilitates engineering personnel to quickly complete the switching on-off test without affecting the normal operation process of the equipment, and has good engineering practicality.

[0038] It should also be noted that through the serial design of steps such as logic state initialization, power-off command triggering, feedback signal judgment, and automatic power supply restoration, a closed-loop control link from logic judgment to execution control to result confirmation is constructed, which enhances the autonomous judgment ability and operational self-consistency of the system's locking function, and avoids the problem of disconnection between control logic and operational behavior in traditional test locking processes. The power-off closing action of the energized normally closed solenoid valve is used as the test locking simulation mechanism. Combined with the real-time collection of the feedback status of the front and rear channels, it can accurately identify whether the locking circuit meets the structural setting conditions, thereby determining whether the locking action is successful, providing logical pre-conditioning for subsequent emergency tripping execution, and significantly reducing the risk of false tripping. By setting a fixed delay time (such as 1 to 3 seconds), the channel power supply is automatically restored, without relying on manual operation, avoiding long-term power outages. It is particularly suitable for fast verification test scenarios, allowing operators to complete multiple rounds of locking tests in a short time, improving system debugging and maintenance efficiency, and reducing the risk of false alarms and system interruptions.

[0039] Furthermore, real-time monitoring of the health status of the gate loop includes, after the gate logic structure is initialized, real-time collection of the power on / off status and feedback signal of the energized normally closed solenoid valve in the redundant solenoid valve control loop, and judging the health status of the gate loop based on the feedback signal of the energized normally closed solenoid valve.

[0040] Furthermore, judging the health status of the gate circuit based on the feedback signal of the energized normally closed solenoid valve includes comparing the response differences of the gate redundant solenoid valve control circuit. If the energized normally closed solenoid valve in the redundant solenoid valve control circuit feeds back to the disconnected state after the power-off instruction, the health status of the gate circuit is judged to be normal, and a normal status flag code is generated.

[0041] If the normally closed solenoid valve in the redundant solenoid valve control circuit is fed back as not disconnected after the power-off command, the health status of the locking circuit is judged to be abnormal, and an abnormal status flag code is generated.

[0042] It should be noted that after sending the test gate control command to the forward channel and the rear channel, the feedback signal of each energized normally closed solenoid valve in each channel is monitored in real time, and the power-off response status is compared; if at least one energized normally closed solenoid valve in the gate circuit can close and feedback the disconnection status signal under the power-off command, it is considered that the channel response is normal. After the test gate control command is issued, two key status information of each energized normally closed solenoid valve are collected in real time: the power on-off status (whether the power is cut off) and the action feedback signal (whether it is switched from on to off). If at least one energized normally closed solenoid valve in the gate circuit feedback is closed after power off (that is, the feedback signal is in the disconnection state), the gate circuit health state is judged to be normal, and a normal state flag code is generated. If the feedback status of all energized normally closed solenoid valves in the gate circuit does not change or remains on after power off, the gate circuit health state is judged to be abnormal, and an abnormal state flag code is generated.

[0043] It should also be noted that by sending a power-off command before the test locking and collecting the power-off status and feedback signal status of all energized normally closed solenoid valves in real time, it is possible to confirm whether the locking path is in an effective response state before performing the actual blocking action, thereby realizing a judgment control chain that is controllable if the state is healthy and rejected if the state is abnormal, effectively avoiding the safety hazards caused by executing the blocking when the locking circuit is not closed, and incorporating the two independent dimensions of judgment criteria, whether the power-off control command is received and whether the disconnection status signal is fed back, into the same judgment model, avoiding misjudgment caused by the failure of a single signal, and improving the stability and accuracy of the state identification of the energized normally closed solenoid valve.

[0044] S3: Based on the health status of the trip circuit, perform emergency tripping action and complete safe shutdown of the turbine.

[0045] Furthermore, executing the emergency tripping action and completing the safe shutdown of the turbine includes, when the health status of the locking circuit is normal, disconnecting the power supply of the normally closed solenoid valve of the locking circuit, releasing the closed state of the hydraulic circuit, driving the main steam valve actuator to start the closing action, and during the closing process of the main steam valve, issuing an execution instruction to stop the oil supply to the oil motor, controlling the oil motor to stop hydraulic maintenance, and outputting the shutdown status mark after the main steam valve is completely closed and the pressure supply is terminated.

[0046] When the health status of the gate circuit is abnormal, the emergency tripping action is not performed, and a gate circuit abnormal status alarm signal is generated. The status feedback information of the currently energized normally closed solenoid valve is recorded to prompt manual intervention.

[0047] It should be noted that when the lock circuit is in a normal state, the tripping process is initiated. First, the power supply to all energized normally closed solenoid valves in the lock control circuit is disconnected, causing the hydraulic circuit to enter a closed state and ensuring that the trip actuator is in a drivable state. The main steam valve actuator is controlled to issue a mechanical closing command, driving the main steam valve from fully open to fully closed. During the main steam valve closing process, the following actions are performed simultaneously: a control command to stop the oil supply to the oil motor is issued; the oil motor is controlled to stop hydraulic maintenance; after the main steam valve is detected to be fully closed and the hydraulic signal returns to zero, the turbine shutdown status is output. If the lock circuit health status is determined to be abnormal, that is, the feedback signals of some energized normally closed solenoid valves are abnormal or inconsistent, the system blocks the execution of the tripping process and outputs a lock circuit abnormality alarm signal. The feedback status and on-off status of all currently energized normally closed solenoid valves are recorded. The operation and maintenance personnel are prompted to perform on-site manual confirmation and intervention to avoid performing emergency main steam valve trip operations when there is a risk of control circuit failure.

[0048] It should also be noted that by making the healthy state of the locking circuit a prerequisite for the tripping action, the locking circuit is considered closed and the main steam valve closing is allowed only when all energized normally closed solenoid valves in the locking control channel return to the open state after de-energization. This effectively prevents the erroneous execution of the tripping action when the path is not closed or the signal is unclear, improving the control safety and adaptability of the tripping operation to working conditions. During the main steam valve closing process, the following operations are simultaneously executed: stopping the oil supply to the hydraulic motor, controlling the hydraulic maintenance to terminate, detecting the main steam valve closing state and returning the pressure signal to zero, and outputting the shutdown status code. This achieves a high degree of linkage between mechanical action, electro-hydraulic control, and signal confirmation, ensuring the complete closure of the shutdown state and avoiding problems such as interrupted shutdown execution or incomplete closed-loop action.

[0049] Example 2, reference Figure 2 , which is an embodiment of the present invention, provides an emergency tripping system for steam turbine test tripping, including a tripping structure construction module 100, a tripping circuit monitoring module 200, and a tripping control and shutdown execution module 300.

[0050] Among them, S4: constructing the gate structure module 100 includes a solenoid valve channel configuration unit 101 and a gate logic initialization unit 102. The solenoid valve channel configuration unit 101 is used to configure four solenoid valves to form a front channel and a rear channel, and establish a redundant solenoid valve control loop. The gate logic initialization unit 102 is used to collect the state of the normally closed solenoid valve when energized and generate a gate logic state code.

[0051] It should also be noted that the solenoid valve channel configuration unit 101 passes the configuration status of the four solenoid valves in the channel to the gate logic initialization unit 102, the gate logic initialization unit 102 passes the gate logic structure status code to the gate test control unit 201 for executing the test power off, and the gate logic initialization unit 102 passes the initialized redundant control logic to the loop health status assessment unit 202 for establishing the channel logic structure criterion.

[0052] S5: The gate loop monitoring module 200 includes a gate test control unit 201 and a loop health status evaluation unit 202. The gate test control unit 201 is used to issue a test power-off instruction to the normally closed solenoid valve to simulate the gate action. The loop health status evaluation unit 202 is used to determine whether the gate loop is healthy based on the feedback from the normally closed solenoid valve.

[0053] It should also be noted that the locking test control unit 201 transmits the test locking control instruction to the circuit health status evaluation unit 202, and the circuit health status evaluation unit 202 transmits the locking circuit health status judgment result to the shutoff execution control unit 301 for determining whether to execute the main steam valve closing instruction.

[0054] S6: The shutoff control and shutdown execution module 300 includes a shutoff execution control unit 301 and a shutdown process confirmation unit 302. The shutoff execution control unit 301 is used to execute the main steam valve closing operation in a healthy state, and the shutdown process confirmation unit 302 is used to confirm that the main steam valve is closed and complete the shutdown or trigger abnormal processing.

[0055] It should also be noted that the shutoff execution control unit 301 transmits the main steam valve closing action instruction and the oil motor stop oil supply signal to the shutdown process confirmation unit 302 to determine whether the valve is completely closed.

Claims

1. A method for emergency tripping of a steam turbine during test operation, characterized in that: include: Establish a redundant solenoid valve control loop and initialize the lock logic structure; Based on the lock logic structure, issue a test lock control command and monitor the health status of the lock circuit in real time; According to the health status of the trip circuit, the emergency trip action is executed and the turbine is safely shut down.

2. The emergency tripping method for a steam turbine test according to claim 1, characterized in that: The establishment of a redundant solenoid valve control circuit includes setting four energized normally closed solenoid valves as a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve; The first solenoid valve and the third solenoid valve are connected in parallel to form a front channel, the second solenoid valve and the fourth solenoid valve are connected in parallel to form a rear channel, and the front channel and the rear channel are connected in series to form a redundant solenoid valve control loop.

3. The emergency tripping method for a steam turbine test trip according to claim 2, characterized in that: The initialization latching logic structure includes setting a test latching trigger interface, determining whether the four normally closed solenoid valves are in the initial closed state, the power status and feedback signal of the redundant solenoid valve control circuit, establishing the redundant solenoid valve control circuit status monitoring logic, configuring the fault diagnosis register in the initialization stage, and generating the current latching logic status code.

4. The emergency tripping method for a steam turbine test trip according to claim 3, characterized in that: The issuing of the test gate control instruction includes, after the gate logic structure is initialized and the gate logic status code is generated, activating the test gate trigger interface, sending a power-off control instruction to the redundant solenoid valve control circuit based on the gate logic structure, disconnecting the power supply of all energized normally closed solenoid valves in the redundant solenoid valve control circuit, collecting the energized normally closed solenoid valve feedback signal, judging whether the test gate action is completed, and automatically restoring the channel power supply according to the set strategy after the test gate action is completed.

5. The emergency tripping method for a steam turbine test trip according to claim 4, characterized in that: The real-time monitoring of the health status of the locking circuit includes, after the locking logic structure is initialized, real-time collection of the power on / off status and feedback signal of the energized normally closed solenoid valve in the redundant solenoid valve control circuit, and judging the health status of the locking circuit based on the feedback signal of the energized normally closed solenoid valve.

6. The emergency tripping method for a steam turbine test according to claim 5, characterized in that: The determining of the health status of the latching circuit based on the feedback signal of the energized normally closed solenoid valve includes comparing and testing the response difference of the latching redundant solenoid valve control circuit; if the energized normally closed solenoid valve in the redundant solenoid valve control circuit feeds back an open state after the power-off instruction, determining that the health status of the latching circuit is normal, and generating a normal state flag code; If the normally closed solenoid valve in the redundant solenoid valve control circuit is fed back as not disconnected after the power-off command, the health status of the locking circuit is judged to be abnormal, and an abnormal status flag code is generated.

7. The emergency tripping method for a steam turbine test according to claim 6, characterized in that: The execution of the emergency trip action and completion of the safe shutdown of the steam turbine includes, when the health status of the trip circuit is normal, disconnecting the power supply of the energized normally closed solenoid valve of the trip circuit, releasing the closed state of the hydraulic circuit, driving the main steam valve actuator to start the closing action, issuing an execution instruction to stop the oil supply to the oil motor during the closing process of the main steam valve, controlling the oil motor to stop hydraulic maintenance, and outputting a shutdown status flag after the main steam valve is completely closed and the pressure supply is terminated; When the health status of the locking circuit is abnormal, the emergency tripping action is not performed, and a locking circuit abnormal status alarm signal is generated, and the current state feedback information of the solenoid valve is recorded to prompt manual intervention.

8. An emergency tripping system for a steam turbine test trip, employing the emergency tripping method for a steam turbine test trip according to any one of claims 1 to 7, characterized in that: It includes a gate structure construction module (100), a gate circuit monitoring module (200), and a trip control and shutdown execution module (300); The gate-locking structure construction module (100) comprises a solenoid valve channel configuration unit (101) and a gate-locking logic initialization unit (102). The solenoid valve channel configuration unit (101) is used to configure four solenoid valves to form a front channel and a rear channel and establish a redundant solenoid valve control loop. The gate-locking logic initialization unit (102) is used to collect the state of the energized normally closed solenoid valve and generate a gate-locking logic state code. The latching circuit monitoring module (200) comprises a latching test control unit (201) and a circuit health status evaluation unit (202), wherein the latching test control unit (201) is used to send a test power-off instruction to the energized normally closed solenoid valve to simulate a latching action, and the circuit health status evaluation unit (202) is used to determine whether the latching circuit is healthy based on feedback from the energized normally closed solenoid valve; The shutoff control and shutdown execution module (300) comprises a shutoff execution control unit (301) and a shutdown process confirmation unit (302). The shutoff execution control unit (301) is used to execute a main steam valve closing operation in a healthy state, and the shutdown process confirmation unit (302) is used to confirm that the main steam valve is closed and completes the shutdown or triggers an abnormality process.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the emergency tripping method for a steam turbine test shutdown according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the emergency tripping method for a steam turbine test shutdown according to any one of claims 1 to 7 are implemented.

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