Method and system for preventing boiler from tripping and relating to steam turbine bypass system

Abstract

The invention belongs to the technical field of control of thermal power generation boiler protection systems, and particularly relates to a boiler tripping prevention method and system for a steam turbine bypass system. When the unit load is smaller than 30% of the rated power (bypass capacity) and the bypass system of the unit is in a closed state, a steam turbine trips due to faults, and control logic enables a boiler not to trip and to keep a normal operation state by quickly opening a high bypass pressure regulating valve and a low bypass pressure regulating valve of the bypass system within set time; therefore, on one hand, the bypass system can ensure that the reheater of the unit has a certain steam flow, dry burning of the reheater is avoided, and the effect of protecting the reheater is achieved; and on the other hand, grid-connected power generation of the unit can be quickly recovered after the turbine fault is removed, so that the downtime is reduced, and the stability of the whole system is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of control of thermal power generation boiler protection systems, and in particular relates to a method and system for preventing boiler tripping in a turbine bypass system. Background Art

[0002] When any dangerous operating conditions that endanger the safe operation of the boiler occur in a thermal power plant, the boiler main protection will be activated to cut off all fuel entering the furnace to ensure the safety of the boiler, avoid personal injury and equipment damage accidents, and achieve the purpose of limiting further expansion of the accident.

[0003] A turbine bypass system is a steam desuperheating and decompression system connected in parallel with the turbine. It consists of bypass piping, decompression and desuperheating valves, and control mechanisms. During unit startup or during an emergency, the turbine bypass system redirects boiler steam to the next-stage pipeline or condenser, bypassing the turbine. Large thermal power units utilize high-capacity, high-parameter, reheat-type thermal systems, configured with a turbine-boiler-electricity unit. The bypass system can address certain incompatibilities between the turbine and boiler due to differing characteristics.

[0004] In current thermal power plants, the control logic for a turbine trip triggering a boiler trip is typically designed as follows: when the unit load exceeds 30% of the rated power (bypass capacity), the turbine trips, triggering a boiler trip. When the unit load is less than 30% of the rated power (bypass capacity), and at least one of the bypass system's high-bypass valve or low-bypass valve is closed, the turbine trips, triggering a boiler trip. For control logic when the unit load exceeds 30% of the rated power (bypass capacity), since the unit load exceeds the bypass capacity, if a turbine trip occurs, the boiler must trip to prevent steam pipeline overpressure, regardless of the state of the bypass system's high-bypass valve or low-bypass valve. For control logic when the unit load is less than 30% of the rated power (bypass capacity), if a turbine trip occurs, at least one of the bypass system's high-bypass valve or low-bypass valve is closed, sealing the steam pipeline. To ensure that steam generated by the boiler does not cause pipeline overpressure, the boiler must be tripped. For the control logic when the unit load is less than 30% of the rated power (bypass capacity), after the turbine trips, the boiler will trip because the unit's bypass system is in a closed state. Therefore, after the turbine fault is eliminated, the boiler needs to be re-ignited to restore the normal operation of the unit, which will greatly delay the normal operation time of the unit and waste fuel, and will also increase the time of unstable operation of the power grid system. Summary of the Invention

[0005] In order to solve the problem in the prior art that the boiler needs to be re-ignited to restore the normal operation of the unit after the turbine trips, a method and system for preventing boiler tripping involving a turbine bypass system are proposed; A method for preventing boiler tripping involving a steam turbine bypass system, comprising: Step 1: Obtain the measured values of the main steam pressure and reheat steam pressure of the steam system; Step 2: Subtract the main steam pressure measurement value from the set main steam pressure setting value to obtain the main steam pressure deviation value, and input the main steam pressure deviation value into the PID controller to obtain the process value of the high bypass pressure regulating valve valve opening instruction; The reheat steam pressure deviation value is obtained by subtracting the reheat steam pressure measurement value from the set reheat steam pressure setting value, and the reheat steam pressure deviation value is input into the PID controller to obtain the process value of the low bypass pressure regulating valve valve opening instruction; Step 3: Determine whether a manual quick opening command signal or a turbine trip signal generated when the turbine unit load is less than the bypass capacity is received. If so, go to step 4; if not, go to step 5; Step 4: Determine whether a manual quick closing command signal is received. If so, adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 0% opening at the same time, and end; if not, adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 100% opening at the same time, and end; Step 5: Determine whether a manual quick closing command signal is received. If so, adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 0% opening at the same time, and end; if not, adjust the high bypass pressure regulating valve opening to the process value of the high bypass pressure regulating valve opening command, adjust the low bypass pressure regulating valve opening to the process value of the low bypass pressure regulating valve opening command, and end.

[0006] A boiler trip prevention system for a steam turbine bypass system, comprising: Main steam pressure measurement module, reheat steam pressure measurement module, data processing module, PID controller, first value selection module, second value selection module, first condition input module, second condition input module and pressure regulating valve opening control module; A main steam pressure measurement module is used to obtain a main steam pressure measurement value and send the main steam pressure measurement value to a data processing module; a reheat steam pressure measurement module, configured to obtain a reheat steam pressure measurement value and send the reheat steam pressure measurement value to a data processing module; The data processing module is used to obtain a main steam pressure deviation value by subtracting the received main steam pressure measurement value from the set main steam pressure setting value, and input the main steam pressure deviation value into the PID controller; obtain a reheat steam pressure deviation value by subtracting the received reheat steam pressure measurement value from the set reheat steam pressure setting value, and input the reheat steam pressure deviation value into the PID controller. a PID controller, configured to calculate an input main steam pressure deviation value to obtain a process value of a high bypass pressure regulating valve valve opening instruction, and send the process value of the high bypass pressure regulating valve valve opening instruction to a first value selection module; calculate an input reheat steam pressure deviation value to obtain a process value of a low bypass pressure regulating valve valve opening instruction, and send the process value of the low bypass pressure regulating valve valve opening instruction to the first value selection module; a first condition input module, configured to receive a manual quick opening command signal sent by an external system or a turbine trip signal when the unit load is less than the bypass capacity, and send the received manual quick opening command signal or the turbine trip signal when the unit load is less than the bypass capacity to the first value selection module; The first value selection module is configured to determine whether a manual quick opening command signal or a turbine trip signal when the unit load is less than the bypass capacity is received, and if so, generate a valve opening 100% command signal and send the valve opening 100% command signal to the second value selection module; if not, send the received process value of the high bypass pressure regulating valve valve opening command and the process value of the low bypass pressure regulating valve valve opening command to the second value selection module; A second condition input module is used to receive a manual quick closing instruction signal sent by an external system and send the manual quick closing instruction signal to the second value selection module; The second value selection module is configured to determine whether a manual quick closing instruction signal is received, and if so, to send a valve opening 0% instruction signal to the pressure regulating valve opening control module; if not, to send a valve opening 100% instruction signal or a process value of the high bypass pressure regulating valve valve opening instruction and a process value of the low bypass pressure regulating valve valve opening instruction output by the first value selection module to the pressure regulating valve opening control module; The pressure regulating valve opening control module is used to adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 100% opening at the same time according to the received valve opening 100% instruction signal; adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 0% opening at the same time according to the received valve opening 0% instruction signal; adjust the high bypass pressure regulating valve opening to the high bypass pressure regulating valve opening process value according to the received high bypass pressure regulating valve valve opening instruction process value; adjust the low bypass pressure regulating valve opening to the low bypass pressure regulating valve valve opening process value according to the received low bypass pressure regulating valve valve opening instruction process value.

[0007] Beneficial effects of the present invention: A method for preventing boiler tripping of a steam turbine bypass system of the present invention, when the unit load is less than 30% (bypass capacity) of the rated power and the bypass system of the unit is in a closed state, when the steam turbine trips due to a fault, the control logic quickly opens the high bypass pressure regulating valve and the low bypass pressure regulating valve of the bypass system within a set time, so that the boiler does not trip and maintains a normal operating state; in this way, on the one hand, the bypass system can ensure that the reheater of the unit has a certain steam flow, avoiding dry burning of the reheater, thereby playing a role in protecting the reheater; on the other hand, after the turbine fault is eliminated, the unit can be quickly restored to grid-connected power generation, thereby reducing downtime and being beneficial to the stability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural diagram of a steam turbine bypass system in the prior art; Figure 2 A logic diagram of a method for preventing boiler tripping involving a turbine bypass system according to a specific embodiment of the present application; Figure 3 This is a structural diagram of a boiler trip prevention system involving a turbine bypass system according to a specific implementation method of the present application. DETAILED DESCRIPTION

[0009] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0010] The turbine bypass system refers to the steam temperature reduction and pressure reduction system connected in parallel with the turbine, such as Figure 1 As shown in the figure, it consists of a bypass pipeline, pressure-reducing and temperature-reducing valves, and a control mechanism. Its function is to direct boiler steam, bypassing the turbine during startup or during fault conditions, to the next-stage pipeline or condenser. In current thermal power plants, the control logic for units with loads less than 30% of rated power (bypass capacity) is such that if the turbine trips, at least one of the bypass system's high- and low-bypass valves will be closed, sealing the steam pipeline. To prevent boiler steam from overpressurizing the pipeline, the boiler must be tripped. This control logic, when the unit load is less than 30% of rated power (bypass capacity), trips the turbine due to the closed bypass system. Consequently, after the turbine fault is resolved, the boiler must be re-ignited to restore normal operation. This significantly delays normal unit operation, wastes fuel, and increases the duration of unstable power grid operation.

[0011] In view of this, an embodiment of the present application provides a method for preventing boiler tripping involving a turbine bypass system, comprising: Step 1: Obtain the measured values of the main steam pressure and reheat steam pressure of the steam system; Step 2: Subtract the main steam pressure measurement value from the set main steam pressure setting value to obtain the main steam pressure deviation value, and input the main steam pressure deviation value into the PID controller to obtain the process value of the high bypass pressure regulating valve valve opening instruction; The reheat steam pressure deviation value is obtained by subtracting the reheat steam pressure measurement value from the set reheat steam pressure setting value, and the reheat steam pressure deviation value is input into the PID controller to obtain the process value of the low bypass pressure regulating valve valve opening instruction; Step 3: Determine whether a manual quick opening command signal or a turbine trip signal generated when the turbine unit load is less than the bypass capacity is received. If so, go to step 4; if not, go to step 5; Step 4: Determine whether a manual quick closing command signal is received. If so, adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 0% opening at the same time, and end; if not, adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 100% opening at the same time, and end; Step 5: Determine whether a manual quick closing command signal is received. If so, adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 0% opening at the same time, and end; if not, adjust the high bypass pressure regulating valve opening to the process value of the high bypass pressure regulating valve opening command, adjust the low bypass pressure regulating valve opening to the process value of the low bypass pressure regulating valve opening command, and end.

[0012] Specifically, the valve openings of the high bypass pressure regulating valve and the low bypass pressure regulating valve are controlled according to the main steam pressure and the reheat steam pressure respectively, and the manual quick opening instruction, the turbine tripping signal and the manual quick closing instruction are received in real time to dynamically adjust the valve openings of the high bypass pressure regulating valve and the low bypass pressure regulating valve; so that the boiler does not trip but maintains normal operation, ensures that the reheater of the unit has a certain steam flow, avoids dry burning of the reheater, and plays a role in protecting the reheater; so that the unit can quickly resume grid-connected power generation after the turbine fault is eliminated, reducing downtime and benefiting the stability of the entire system.

[0013] Furthermore, the method for obtaining the measured value of the main steam pressure of the steam system includes: Obtaining a first main steam pressure signal, a second main steam pressure signal, and a third main steam pressure signal of the steam system, and determining whether the obtained first main steam pressure signal, second main steam pressure signal, and third main steam pressure signal are normal signals; If only one of the first main steam pressure signal, the second main steam pressure signal, and the third main steam pressure signal is normal, the pressure value corresponding to the normal main steam pressure signal is used as the main steam pressure measurement value; If there is an abnormal signal among the first main steam pressure signal, the second main steam pressure signal and the third main steam pressure signal, and the deviation between the other two normal signals is less than the set threshold, the average of the pressure values corresponding to the other two normal signals is used as the main steam pressure measurement value; If the first main steam pressure signal, the second main steam pressure signal and the third main steam pressure signal are all normal signals, then the corresponding first main steam pressure value, the second main steam pressure value and the third main steam pressure value are obtained according to the first main steam pressure signal, the second main steam pressure signal and the third main steam pressure signal, respectively, and the deviation value between each two pressure values is calculated; set up , , ,in is the first main steam pressure value and the second main steam pressure value The first deviation value between is the first main steam pressure value and the third main steam pressure value The second deviation value between The second main steam pressure value and the third main steam pressure value The third deviation value between The first deviation value , the second deviation value and the third deviation value At the same time, compared with the set threshold, if the first deviation value , the second deviation value and the third deviation value If the first deviation value is less than the set threshold, the median of the first main steam pressure value, the second main steam pressure value and the third main steam pressure value is taken as the main steam pressure measurement value; if the first deviation value is less than the set threshold, the median of the first main steam pressure value, the second main steam pressure value and the third main steam pressure value is taken as the main steam pressure measurement value; Greater than the set threshold, and the second deviation value and the third deviation value If the second deviation value is less than the set threshold, the third main steam pressure value is used as the main steam pressure measurement value; Greater than the set threshold, and the first deviation value and the third deviation value If the third deviation value is less than the set threshold, the second main steam pressure value is used as the main steam pressure measurement value; Greater than the set threshold, and the first deviation value and the second deviation value If both are less than the set threshold, the first main steam pressure value will be taken as the main steam pressure measurement value.

[0014] Furthermore, the method for obtaining the measured value of the reheat steam pressure of the steam system includes: obtaining a first reheat steam pressure signal, a second reheat steam pressure signal, and a third reheat steam pressure signal of the steam system, and determining whether the obtained first reheat steam pressure signal, the second reheat steam pressure signal, and the third reheat steam pressure signal are normal signals; If only one of the first reheat steam pressure signal, the second reheat steam pressure signal, and the third reheat steam pressure signal is normal, the pressure value corresponding to the normal reheat steam pressure signal is used as the reheat steam pressure measurement value; If there is an abnormal signal among the first reheat steam pressure signal, the second reheat steam pressure signal and the third reheat steam pressure signal, and the deviation between the other two normal signals is less than the set threshold, the average of the pressure values corresponding to the other two normal signals is used as the reheat steam pressure measurement value; If the first reheat steam pressure signal, the second reheat steam pressure signal, and the third reheat steam pressure signal are all normal signals, obtaining the corresponding first reheat steam pressure value, second reheat steam pressure value, and third reheat steam pressure value according to the first reheat steam pressure signal, the second reheat steam pressure signal, and the third reheat steam pressure signal, respectively, and calculating the deviation between every two pressure values; set up , , ,in is the first reheat steam pressure value and the second reheat steam pressure value The first deviation value between is the first reheat steam pressure value and the third reheat steam pressure value The second deviation value between is the second reheat steam pressure value and the third reheat steam pressure value The third deviation value between The first deviation value , the second deviation value and the third deviation value At the same time, compared with the set threshold, If the first deviation , the second deviation value and the third deviation value If the first deviation value is less than the set threshold, the median of the first reheat steam pressure value, the second reheat steam pressure value and the third reheat steam pressure value is taken as the reheat steam pressure measurement value; if the first deviation value is less than the set threshold, the median of the first reheat steam pressure value, the second reheat steam pressure value and the third reheat steam pressure value is taken as the reheat steam pressure measurement value; Greater than the set threshold, and the second deviation value and the third deviation value are both less than the set threshold, the third reheat steam pressure value is used as the reheat steam pressure measurement value; if the second deviation value Greater than the set threshold, and the first deviation value and the third deviation value are both less than the set threshold, the second reheat steam pressure value is used as the reheat steam pressure measurement value; if the third deviation value Greater than the set threshold, and the first deviation value and the second deviation value If both are less than the set threshold, the first reheat steam pressure value is taken as the reheat steam pressure measurement value.

[0015] Specific embodiment 2: A boiler trip prevention system involving a turbine bypass system, comprising: Main steam pressure measurement module, reheat steam pressure measurement module, data processing module, PID controller, first value selection module, second value selection module, first condition input module, second condition input module and pressure regulating valve opening control module; A main steam pressure measurement module is used to obtain a main steam pressure measurement value and send the main steam pressure measurement value to a data processing module; a reheat steam pressure measurement module, configured to obtain a reheat steam pressure measurement value and send the reheat steam pressure measurement value to a data processing module; a data processing module, configured to obtain a main steam pressure deviation value by subtracting a received main steam pressure measurement value from a set main steam pressure set value, and input the main steam pressure deviation value into a PID controller; obtain a reheat steam pressure deviation value by subtracting a received reheat steam pressure measurement value from a set reheat steam pressure set value, and input the reheat steam pressure deviation value into the PID controller; a PID controller, configured to calculate an input main steam pressure deviation value to obtain a process value of a high bypass pressure regulating valve valve opening instruction, and send the process value of the high bypass pressure regulating valve valve opening instruction to a first value selection module; calculate an input reheat steam pressure deviation value to obtain a process value of a low bypass pressure regulating valve valve opening instruction, and send the process value of the low bypass pressure regulating valve valve opening instruction to the first value selection module; a first condition input module, configured to receive a manual quick opening command signal sent by an external system or a turbine trip signal when the unit load is less than the bypass capacity, and send the received manual quick opening command signal or the turbine trip signal when the unit load is less than the bypass capacity to the first value selection module; The first value selection module is configured to determine whether a manual quick opening command signal or a turbine trip signal when the unit load is less than the bypass capacity is received, and if so, generate a valve opening 100% command signal and send the valve opening 100% command signal to the second value selection module; if not, send the received process value of the high bypass pressure regulating valve valve opening command and the process value of the low bypass pressure regulating valve valve opening command to the second value selection module; A second condition input module is used to receive a manual quick closing instruction signal sent by an external system and send the manual quick closing instruction signal to the second value selection module; The second value selection module is configured to determine whether a manual quick closing instruction signal is received, and if so, to send a valve opening 0% instruction signal to the pressure regulating valve opening control module; if not, to send a valve opening 100% instruction signal or a process value of the high bypass pressure regulating valve valve opening instruction and a process value of the low bypass pressure regulating valve valve opening instruction output by the first value selection module to the pressure regulating valve opening control module; The pressure regulating valve opening control module is used to adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 100% opening at the same time according to the received valve opening 100% instruction signal; adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 0% opening at the same time according to the received valve opening 0% instruction signal; adjust the high bypass pressure regulating valve opening to the high bypass pressure regulating valve opening process value according to the received high bypass pressure regulating valve valve opening instruction process value; adjust the low bypass pressure regulating valve opening to the low bypass pressure regulating valve valve opening process value according to the received low bypass pressure regulating valve valve opening instruction process value.

[0016] Specific embodiment three: A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that when the processor executes the computer program, the steps of a method for preventing boiler tripping involving a turbine bypass system as described in specific embodiment one are implemented.

[0017] Specific embodiment 4: A computer-readable storage medium stores a computer program thereon, characterized in that when the computer program is executed by a processor, the steps of a method for preventing boiler tripping involving a turbine bypass system as described in specific embodiment 1 are implemented.

[0018] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A method for preventing boiler tripping involving a turbine bypass system, characterized in that: include: Step 1: Obtain the measured values of the main steam pressure and reheat steam pressure of the steam system; Step 2: Subtract the main steam pressure measurement value from the set main steam pressure setting value to obtain the main steam pressure deviation value, and input the main steam pressure deviation value into the PID controller to obtain the process value of the high bypass pressure regulating valve valve opening instruction; The reheat steam pressure deviation value is obtained by subtracting the reheat steam pressure measurement value from the set reheat steam pressure setting value, and the reheat steam pressure deviation value is input into the PID controller to obtain the process value of the low bypass pressure regulating valve valve opening instruction; Step 3: Determine whether a manual quick opening command signal or a turbine trip signal generated when the turbine unit load is less than the bypass capacity is received. If so, go to step 4; if not, go to step 5; Step 4: Determine whether a manual quick closing command signal is received. If so, adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 0% opening at the same time, and end; if not, adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 100% opening at the same time, and end; Step 5: Determine whether a manual quick closing command signal is received. If so, adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 0% opening at the same time, and end; if not, adjust the high bypass pressure regulating valve opening to the process value of the high bypass pressure regulating valve opening command, adjust the low bypass pressure regulating valve opening to the process value of the low bypass pressure regulating valve opening command, and end.

2. A method for preventing boiler tripping involving a turbine bypass system according to claim 1, characterized in that: Methods for obtaining the measured value of the main steam pressure of the steam system include: Obtaining a first main steam pressure signal, a second main steam pressure signal, and a third main steam pressure signal of the steam system, and determining whether the obtained first main steam pressure signal, second main steam pressure signal, and third main steam pressure signal are normal signals; If only one of the first main steam pressure signal, the second main steam pressure signal, and the third main steam pressure signal is normal, the pressure value corresponding to the normal main steam pressure signal is used as the main steam pressure measurement value; If there is an abnormal signal among the first main steam pressure signal, the second main steam pressure signal and the third main steam pressure signal, and the deviation between the other two normal signals is less than the set threshold, the average of the pressure values corresponding to the other two normal signals is used as the main steam pressure measurement value; If the first main steam pressure signal, the second main steam pressure signal and the third main steam pressure signal are all normal signals, then the corresponding first main steam pressure value, the second main steam pressure value and the third main steam pressure value are obtained according to the first main steam pressure signal, the second main steam pressure signal and the third main steam pressure signal, respectively, and the deviation value between each two pressure values is calculated; set up , , ,in is the first main steam pressure value and the second main steam pressure value The first deviation value between is the first main steam pressure value and the third main steam pressure value The second deviation value between The second main steam pressure value and the third main steam pressure value The third deviation value between The first deviation value , the second deviation value and the third deviation value At the same time, compared with the set threshold, if the first deviation value , the second deviation value and the third deviation value If the first deviation value is less than the set threshold, the median of the first main steam pressure value, the second main steam pressure value and the third main steam pressure value is taken as the main steam pressure measurement value; if the first deviation value is less than the set threshold, the median of the first main steam pressure value, the second main steam pressure value and the third main steam pressure value is taken as the main steam pressure measurement value; Greater than the set threshold, and the second deviation value and the third deviation value If the second deviation value is less than the set threshold, the third main steam pressure value is used as the main steam pressure measurement value; Greater than the set threshold, and the first deviation value and the third deviation value If the third deviation value is less than the set threshold, the second main steam pressure value is used as the main steam pressure measurement value; Greater than the set threshold, and the first deviation value and the second deviation value If both are less than the set threshold, the first main steam pressure value will be taken as the main steam pressure measurement value.

3. The method for preventing boiler tripping involving a turbine bypass system according to claim 1, characterized in that: Methods for obtaining measurements of reheat steam pressure in steam systems include: obtaining a first reheat steam pressure signal, a second reheat steam pressure signal, and a third reheat steam pressure signal of the steam system, and determining whether the obtained first reheat steam pressure signal, the second reheat steam pressure signal, and the third reheat steam pressure signal are normal signals; If only one of the first reheat steam pressure signal, the second reheat steam pressure signal, and the third reheat steam pressure signal is normal, the pressure value corresponding to the normal reheat steam pressure signal is used as the reheat steam pressure measurement value; If there is an abnormal signal among the first reheat steam pressure signal, the second reheat steam pressure signal and the third reheat steam pressure signal, and the deviation between the other two normal signals is less than the set threshold, the average of the pressure values corresponding to the other two normal signals is used as the reheat steam pressure measurement value; If the first reheat steam pressure signal, the second reheat steam pressure signal, and the third reheat steam pressure signal are all normal signals, obtaining the corresponding first reheat steam pressure value, second reheat steam pressure value, and third reheat steam pressure value according to the first reheat steam pressure signal, the second reheat steam pressure signal, and the third reheat steam pressure signal, respectively, and calculating the deviation between every two pressure values; set up , , ,in is the first reheat steam pressure value and the second reheat steam pressure value The first deviation value between is the first reheat steam pressure value and the third reheat steam pressure value The second deviation value between is the second reheat steam pressure value and the third reheat steam pressure value The third deviation value between The first deviation value , the second deviation value and the third deviation value At the same time, compared with the set threshold, If the first deviation , the second deviation value and the third deviation value If the first deviation value is less than the set threshold, the median of the first reheat steam pressure value, the second reheat steam pressure value and the third reheat steam pressure value is taken as the reheat steam pressure measurement value; if the first deviation value is less than the set threshold, the median of the first reheat steam pressure value, the second reheat steam pressure value and the third reheat steam pressure value is taken as the reheat steam pressure measurement value; Greater than the set threshold, and the second deviation value and the third deviation value are both less than the set threshold, the third reheat steam pressure value is used as the reheat steam pressure measurement value; if the second deviation value Greater than the set threshold, and the first deviation value and the third deviation value are both less than the set threshold, the second reheat steam pressure value is used as the reheat steam pressure measurement value; if the third deviation value Greater than the set threshold, and the first deviation value and the second deviation value If both are less than the set threshold, the first reheat steam pressure value is taken as the reheat steam pressure measurement value.

4. A boiler trip prevention system for a steam turbine bypass system, characterized in that: include: Main steam pressure measurement module, reheat steam pressure measurement module, data processing module, PID controller, first value selection module, second value selection module, first condition input module, second condition input module and pressure regulating valve opening control module; A main steam pressure measurement module is used to obtain a main steam pressure measurement value and send the main steam pressure measurement value to a data processing module; a reheat steam pressure measurement module, configured to obtain a reheat steam pressure measurement value and send the reheat steam pressure measurement value to a data processing module; a data processing module, configured to obtain a main steam pressure deviation value by subtracting a received main steam pressure measurement value from a set main steam pressure set value, and input the main steam pressure deviation value into a PID controller; obtain a reheat steam pressure deviation value by subtracting a received reheat steam pressure measurement value from a set reheat steam pressure set value, and input the reheat steam pressure deviation value into the PID controller; a PID controller, configured to calculate an input main steam pressure deviation value to obtain a process value of a high bypass pressure regulating valve valve opening instruction, and send the process value of the high bypass pressure regulating valve valve opening instruction to a first value selection module; calculate an input reheat steam pressure deviation value to obtain a process value of a low bypass pressure regulating valve valve opening instruction, and send the process value of the low bypass pressure regulating valve valve opening instruction to the first value selection module; a first condition input module, configured to receive a manual quick opening command signal sent by an external system or a turbine trip signal when the unit load is less than the bypass capacity, and send the received manual quick opening command signal or the turbine trip signal when the unit load is less than the bypass capacity to the first value selection module; The first value selection module is configured to determine whether a manual quick opening command signal or a turbine trip signal when the unit load is less than the bypass capacity is received, and if so, generate a valve opening 100% command signal and send the valve opening 100% command signal to the second value selection module; if not, send the received process value of the high bypass pressure regulating valve valve opening command and the process value of the low bypass pressure regulating valve valve opening command to the second value selection module; A second condition input module is used to receive a manual quick closing instruction signal sent by an external system and send the manual quick closing instruction signal to the second value selection module; The second value selection module is configured to determine whether a manual quick closing instruction signal is received, and if so, to send a valve opening 0% instruction signal to the pressure regulating valve opening control module; if not, to send a valve opening 100% instruction signal or a process value of the high bypass pressure regulating valve valve opening instruction and a process value of the low bypass pressure regulating valve valve opening instruction output by the first value selection module to the pressure regulating valve opening control module; The pressure regulating valve opening control module is used to adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 100% opening at the same time according to the received valve opening 100% instruction signal; adjust the high bypass pressure regulating valve and the low bypass pressure regulating valve to 0% opening at the same time according to the received valve opening 0% instruction signal; adjust the high bypass pressure regulating valve opening to the high bypass pressure regulating valve opening process value according to the received high bypass pressure regulating valve valve opening instruction process value; adjust the low bypass pressure regulating valve opening to the low bypass pressure regulating valve valve opening process value according to the received low bypass pressure regulating valve valve opening instruction process value.

5. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method for preventing boiler tripping involving a steam turbine bypass system as claimed in any one of claims 1 to 3 are implemented.

6. 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 a method for preventing boiler tripping involving a turbine bypass system as claimed in any one of claims 1 to 3 are implemented.

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