Pressure control method for bypass system of steam turbine under transient condition of sodium-cooled fast reactor

Abstract

The invention particularly relates to a steam turbine bypass system pressure control method under a sodium-cooled fast reactor transient working condition, which comprises the following steps: under the sodium-cooled fast reactor transient working condition, predicting the approximate value of the total valve position of a bypass valve; according to the predicted approximate value of the total valve position of the bypass valve, a bypass valve quick-opening signal is generated to quickly open the corresponding bypass valve; according to the difference value between the main steam header pressure measurement value and the main steam header pressure set value, the PID generates bypass valve position control signals to adjust the valve position of each bypass valve, and the main steam header pressure is kept at the set value; when the calculated set value of the total valve position of the bypass valve is smaller than the predicted approximate value of the total valve position of the bypass valve, the predicted approximate value of the total valve position of the bypass valve serves as the set value of the total valve position of the bypass valve. The invention further relates to a steam turbine bypass system pressure control device under the sodium-cooled fast reactor transient condition, computer equipment and storage equipment. Automatic pressure reduction of the steam turbine bypass system under the transient condition of the sodium-cooled fast reactor is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure control of a steam turbine bypass system under transient working conditions of a sodium-cooled fast reactor, and in particular to a method, device, computer equipment and storage device for pressure control of a steam turbine bypass system under transient working conditions of a sodium-cooled fast reactor. Background Art

[0002] The steam generator of a sodium-cooled fast reactor is a once-through steam generator. The change of the main steam pressure will directly affect the main feed water pressure and main feed water flow, and then affect the key parameters related to the shutdown of the steam generator, such as the steam generator outlet sodium temperature and steam generator outlet steam superheat, which are closely related to nuclear safety. Therefore, it is particularly important to avoid large fluctuations in the main steam pressure.

[0003] The steam turbine bypass system of the sodium-cooled fast reactor is different from that of the pressurized water reactor. It adopts the "machine-follows-the-reactor" operation mode and has a 100% bypass discharge capacity. The steam turbine bypass system is put into operation under the transient operating conditions of the sodium-cooled fast reactor to prevent overpressure in the main steam pipeline system. The transient operating conditions of the sodium-cooled fast reactor include turbine load rejection or sudden closure of the turbine control valve and turbine tripping. When the steam turbine load is rejected or the turbine control valve is suddenly closed, there is a temporary mismatch between the turbine power and the reactor thermal power, the main steam header pressure exceeds the set value, and the steam turbine bypass system is put into operation to prevent overpressure in the main steam pipeline system. When the steam turbine trips, the main steam valve of the steam turbine is closed, and the steam turbine bypass system is put into operation to discharge the main steam to the condenser to prevent overpressure in the main steam pipeline system.

[0004] During the normal operation of the unit, it was found that when the reactor power was above 50% Pn, when the turbine was unloaded, the turbine regulating valve was suddenly closed or the turbine tripped, the bypass valve was opened according to the original design. The bypass valve responded slowly at the beginning of the transient condition, resulting in a large overshoot of the main steam pressure. Thereafter, the bypass valve gradually opened, causing the main steam pressure to drop too quickly, thereby causing coupled oscillations in the main steam pressure regulation and causing the main steam pressure to be out of control. Summary of the invention

[0005] The purpose of the present invention is to provide a method, device, calculation and equipment and storage device for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor, so as to realize automatic pressure control of the steam turbine bypass system under transient conditions of a sodium-cooled fast reactor.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor comprises the following steps:

[0008] Under the transient condition of sodium-cooled fast reactor, the approximate value of the total valve position of the bypass valve corresponding to the amount of steam that needs to pass through the turbine bypass system is predicted;

[0009] According to the predicted approximate value of the total valve position of the bypass valve, a bypass valve quick opening signal is generated and output to the corresponding bypass valve, so as to quickly open the corresponding bypass valve;

[0010] PID calculates the set value of the bypass valve total valve position according to the difference between the measured value of the main steam header pressure and the set value of the main steam header pressure; calculates the set value of the bypass valve position according to the set value of the bypass valve total valve position; generates a bypass valve position control signal according to the set value of the bypass valve position and outputs it to each bypass valve, adjusts the valve position of each bypass valve, and maintains the main steam header pressure at the set value;

[0011] When the set value of the bypass valve total valve position calculated by PID is less than the predicted approximate value of the bypass valve total valve position, the predicted approximate value of the bypass valve total valve position is used as the set value of the bypass valve total valve position.

[0012] As one of the achievable methods, under the transient operating condition of a sodium-cooled fast reactor, predicting an approximate value of the total valve position of the bypass valve corresponding to the amount of steam that needs to pass through the turbine bypass system includes the following steps:

[0013] Under the transient condition of the sodium-cooled fast reactor, according to the difference between the average thermal power of the double-loop of the sodium-cooled fast reactor and the power of the three-loop of the sodium-cooled fast reactor, the approximate value of the total valve position of the bypass valve corresponding to the amount of steam that needs to pass through the turbine bypass system is predicted by the sodium-cooled fast reactor unit commissioning empirical function.

[0014] As one of the achievable methods, the transient operating conditions of the sodium-cooled fast reactor include turbine tripping, turbine load rejection, and sudden closure of the turbine control valve; the sodium-cooled fast reactor unit commissioning experience functions include F(x1) and F(x2);

[0015] Under the condition of turbine tripping, the approximate value of the total valve position of the bypass valve is predicted based on F(x1); under the condition of turbine load rejection and sudden closure of the turbine regulating valve, the approximate value of the total valve position of the bypass valve is predicted based on F(x2);

[0016] F(x1) is: y1=0.4853x1+17, 17%≤y1≤50%; 32%≤x1≤100%, where y1 is

[0017] The approximate value of the total valve position of the bypass valve, x1 is the average thermal power percentage of the double loop of the sodium-cooled fast reactor;

[0018] F(x2) is: y2=0.5556x2-5.5556, 0%≤y2≤50%; 10%≤x2≤100%, where y2

[0019] is the approximate value of the total valve position of the bypass valve, and x2 is the deviation percentage between the average thermal power of the double loop of the sodium-cooled fast reactor reactor and the power of the three loops of the sodium-cooled fast reactor.

[0020] As one of the achievable methods, according to the predicted approximate value of the total valve position of the bypass valve, a bypass valve quick opening signal is generated and output to the corresponding bypass valve, and the corresponding bypass valve is quickly opened, including the following steps:

[0021] When the predicted value of the total valve position of the bypass valve is greater than 30%, a bypass valve quick opening signal is generated and output to the first bypass valve; when the predicted value of the total valve position of the bypass valve is less than 25%, the bypass valve quick opening signal output to the first bypass valve is reset;

[0022] When the predicted value of the total valve position of the bypass valve is greater than 55%, a bypass valve quick opening signal is generated and output to the second bypass valve exhaust valve; when the predicted value of the total valve position of the bypass valve is less than 50%, the bypass valve quick opening signal output to the second bypass valve is reset;

[0023] When the predicted value of the total valve position of the bypass valve is greater than 80%, a bypass valve quick opening signal is generated and output to the third bypass valve; when the predicted value of the total valve position of the bypass valve is less than 75%, the bypass valve quick opening signal output to the third bypass valve is reset;

[0024] When the predicted approximate value of the total valve position of the bypass valve is greater than 105%, a bypass valve quick-opening signal is generated and output to the fourth bypass valve; when the predicted approximate value of the total valve position of the bypass valve is less than 1005%, the bypass valve quick-opening signal output to the fourth bypass valve is reset.

[0025] As one of the achievable methods, PID calculates the set value of the bypass valve total valve position according to the difference between the main steam header pressure measurement value and the main steam header pressure set value, including the following steps:

[0026] Set the target value of main steam header pressure;

[0027] Set the rate of change from the main steam header pressure set value to the main steam header pressure target value;

[0028] generating a main steam header pressure setting value according to a rate of change from the main steam header pressure setting value to the main steam header pressure target value;

[0029] Obtain the measured value of the main steam header pressure; calculate the set value of the bypass valve total valve position according to the difference between the measured value of the main steam header pressure and the set value of the main steam header pressure.

[0030] As one of the feasible methods, PID sets the target value of the main steam header pressure, including the following steps:

[0031] When the main steam header pressure target value is set manually, the main steam header pressure target value input by the operator will be used as the manually set main steam header pressure target value;

[0032] When the main steam header target value is automatically set by internal setting, the main steam header pressure target value is automatically set to 13.7MPa;

[0033] When the main steam manifold target value is automatically set by external setting, the main steam manifold pressure target value input by the operator will be used as the automatically set main steam manifold pressure target value.

[0034] As one achievable manner, the rate of change from the main steam header pressure set value to the main steam header pressure target value is infinite.

[0035] As one of the achievable ways, when the turbine trip signal is within 0.5s, the PID takes the smaller of the generated main steam header pressure setting value and 13MPa as the main steam header pressure setting value.

[0036] As one of the achievable methods, when any of the following three conditions is met, the bypass valve position setting value calculated by PID is limited to increase to prevent the turbine bypass system pressure from oscillating:

[0037] (1) The turbine trip signal is within 0.5s;

[0038] (2) There is no turbine trip signal, the bypass valve position setting value is less than 0, and the measured value of the main steam header pressure is less than the set value;

[0039] (3) The turbine speed is less than 100 rpm, the bypass valve position setting value is less than 0, and the measured value of the main steam header pressure is less than the set value.

[0040] As one of the achievable ways, when there are fault signals of all the pressure transmitters of the main steam header, the bypass valve position is controlled by the bypass valve position control signal generated by the locking PID according to the calculated bypass valve position setting value, and the bypass valve position is controlled by the bypass valve position control signal generated by the bypass valve position setting value manually input by the operator;

[0041] When there is a signal that all the pressure transmitters in the main steam manifold have failed, the bypass valve position control signal generated by the PID according to the calculated bypass valve position setting value is unlocked to control the bypass valve position, and the bypass valve position control signal generated by the PID according to the calculated bypass valve position setting value is used again to control the bypass valve position.

[0042] As one of the feasible ways, a plurality of bypass valves connected in parallel are provided in the turbine bypass system, and the plurality of bypass valves are put into regulation at the same time;

[0043] PID calculates the set value of the bypass valve position based on the equation function f(x) according to the set value of the bypass valve total valve position;

[0044] f(x)=[min(nx-(n-1)×100,100); max(nx-(n-1)×100,0)];

[0045] Wherein, f(x) is the setting value of the bypass valve position, the minimum setting value of the bypass valve position is the smaller value between nx-(n-1)×100 and 100, the maximum setting value of the bypass valve position is the larger value between nx-(n-1)×100 and 0, x is the setting value of the total valve position of the bypass valve, and n is the number of bypass valves.

[0046] In order to achieve the above object, the present invention further provides a pressure control device for a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor, comprising:

[0047] The prediction module is used to predict the approximate value of the bypass valve total valve position corresponding to the amount of steam that needs to pass through the turbine bypass system under the transient operating condition of the sodium-cooled fast reactor; based on the predicted approximate value of the bypass valve total valve position, generate a bypass valve quick opening signal and output it to the corresponding bypass valve, so as to quickly open the corresponding bypass valve;

[0048] PID, used to calculate the set value of the bypass valve total valve position according to the difference between the main steam header pressure measurement value and the main steam header pressure set value; calculate the set value of the bypass valve position according to the bypass valve total valve position set value; generate the bypass valve position control signal according to the bypass valve position set value and output it to each bypass valve, adjust the valve position of each bypass valve, and maintain the main steam header pressure at the set value;

[0049] The increase limit module is used to limit the increase of the bypass valve position setting value calculated by PID;

[0050] The locking module is used to lock or unlock the bypass valve position control signal generated by the PID according to the bypass valve position setting value calculated to control the bypass valve position; the bypass valve position is controlled by the bypass valve position control signal generated by the bypass valve position setting value manually input by the operator;

[0051] When the set value of the bypass valve total valve position calculated by PID is less than the predicted approximate value of the bypass valve total valve position, the predicted approximate value of the bypass valve total valve position is used as the set value of the bypass valve total valve position.

[0052] In order to achieve the above-mentioned purpose, the present invention also provides a computer device, including a memory and a processor, wherein the memory stores computer-readable instructions, and when the processor executes the computer-readable instructions, the steps of the above-mentioned method for controlling the pressure of a turbine bypass system under transient conditions of a sodium-cooled fast reactor are implemented.

[0053] In order to achieve the above-mentioned purpose, the present invention also provides a computer-readable storage medium, on which computer-readable instructions are stored. When the computer-readable instructions are executed, the steps of the above-mentioned method for controlling the pressure of a turbine bypass system under transient conditions of a sodium-cooled fast reactor are implemented.

[0054] Beneficial technical effects of the present invention:

[0055] The method, device, computer equipment and storage device for controlling the pressure of a steam turbine bypass system under a transient working condition of a sodium-cooled fast reactor of the present invention are as follows: at the moment when a transient working condition of a sodium-cooled fast reactor occurs, according to the difference between the average thermal power of a double-loop of a sodium-cooled fast reactor and the power of a three-loop of a sodium-cooled fast reactor, an approximate value of a total valve position of a bypass valve corresponding to the amount of steam that needs to pass through a steam turbine bypass system is rapidly predicted by an empirical function of a sodium-cooled fast reactor unit, which is equivalent to predicting the output value of the total valve position of the bypass valve in advance; according to the approximate value of the total valve position of the bypass valve, a corresponding bypass valve is interlocked for quick opening, which is equivalent to directly adjusting the output value of the bypass valve position to the predicted value; on the basis that some bypass valves have been quickly opened to the predicted value, the bypass valve position is adjusted by PID to realize precise control of the pressure of a main steam header, thereby greatly reducing the PI D adjusts the initial error between the output value of the bypass valve position and the set value, greatly reducing the overshoot and adjustment time during PID regulation of the bypass valve position, so as to achieve control of the main steam pressure through the turbine bypass system after the transient operating condition of the sodium-cooled fast reactor occurs, avoiding the main steam pressure coupled oscillation; PID takes the smaller of the set value of the bypass valve total valve position and the approximate value of the bypass valve total valve position, and generates a bypass valve position control signal to control the bypass valve position, which can prevent PID from outputting a closing signal to the bypass valve that is about to open; when the turbine trips, the set value of the main steam manifold pressure is directly reduced to 13MPa, so that the set value of the main steam manifold pressure is reduced in advance, which also shortens the adjustment time during PID regulation of the bypass valve position and avoids excessive oscillation of the main steam pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is a flow chart of an embodiment of a method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to the present invention;

[0057] Figure 2 It is a schematic structural view of an embodiment of a pressure control device for a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to the present invention;

[0058] Figure 3 The figure is a schematic structural view of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0060] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0061] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0062] There are multiple bypass valves in parallel in the turbine bypass system. The control mode of the turbine bypass system is the pressure control mode; in the pressure control mode, the PID generates the bypass valve position control signal according to the difference between the main steam header pressure measurement value and the main steam header pressure setting value to control the position of each bypass valve and maintain the main steam header pressure at the setting value.

[0063] The pressure control mode of the turbine bypass system has the following problems: when transient conditions such as turbine tripping, turbine load rejection or sudden closure of the turbine control valve occur, the adjustment caused by the PID response time and bypass valve action time under transient conditions further leads to coupled oscillation of the main steam pressure.

[0064] The coupled oscillation of the main steam pressure will directly affect the pressure and flow of the main feedwater system, resulting in a large pressure and flow fluctuation of the main feedwater system, which in turn leads to fluctuations in the sodium temperature at the steam generator outlet. In addition, the coupled oscillation of the main steam pressure also has a certain impact on the main feedwater system, especially the structural strength of the steam generator. Long-term coupled oscillation of the main steam pressure will gradually cause fatigue damage to the steam generator material and affect the life of the unit.

[0065] refer to Figure 1 , a flow chart of an embodiment of a method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor is shown, wherein the method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor comprises the following steps:

[0066] Under the transient condition of sodium-cooled fast reactor, the approximate value of the total valve position of the bypass valve corresponding to the amount of steam that needs to pass through the turbine bypass system is predicted;

[0067] According to the predicted approximate value of the total valve position of the bypass valve, a bypass valve quick opening signal is generated and output to the corresponding bypass valve, so as to quickly open the corresponding bypass valve;

[0068] PID calculates the set value of the bypass valve total valve position according to the difference between the measured value of the main steam header pressure and the set value of the main steam header pressure; calculates the set value of the bypass valve position according to the set value of the bypass valve total valve position; generates a bypass valve position control signal according to the set value of the bypass valve position and outputs it to each bypass valve, adjusts the valve position of each bypass valve, and maintains the main steam header pressure at the set value;

[0069] When the set value of the bypass valve total valve position calculated by PID is less than the predicted approximate value of the bypass valve total valve position, the predicted approximate value of the bypass valve total valve position is used as the set value of the bypass valve total valve position.

[0070] In this embodiment, as one of the achievable methods, under the transient operating condition of a sodium-cooled fast reactor, predicting the approximate value of the total valve position of the bypass valve corresponding to the amount of steam that needs to pass through the turbine bypass system includes the following steps:

[0071] Under the transient condition of the sodium-cooled fast reactor, according to the difference between the average thermal power of the double-loop of the sodium-cooled fast reactor and the power of the three-loop of the sodium-cooled fast reactor, the approximate value of the total valve position of the bypass valve corresponding to the amount of steam that needs to pass through the turbine bypass system is predicted by the sodium-cooled fast reactor unit commissioning empirical function.

[0072] In this embodiment, as one of the achievable methods, the transient operating conditions of the sodium-cooled fast reactor include turbine tripping, turbine load rejection, and sudden closure of the turbine regulating valve; the sodium-cooled fast reactor unit debugging experience function includes F(x1) and F(x2);

[0073] Under the condition of turbine tripping, the approximate value of the total valve position of the bypass valve is predicted based on F(x1); under the condition of turbine load rejection and sudden closure of the turbine regulating valve, the approximate value of the total valve position of the bypass valve is predicted based on F(x2);

[0074] F(x1) is: y1=0.4853x1+17, 17%≤y1≤50%; 32%≤x1≤100%, where y1 is

[0075] The approximate value of the total valve position of the bypass valve, x1 is the average thermal power percentage of the double loop of the sodium-cooled fast reactor;

[0076] F(x2) is: y2=0.5556x2-5.5556, 0%≤y2≤50%; 10%≤x2≤100%, where y2

[0077] is the approximate value of the total valve position of the bypass valve, and x2 is the deviation percentage between the average thermal power of the double loop of the sodium-cooled fast reactor reactor and the power of the three loops of the sodium-cooled fast reactor.

[0078] In this embodiment, as one of the achievable methods, a bypass valve quick opening signal is generated according to the predicted approximate value of the total valve position of the bypass valve and output to the corresponding bypass valve, and the corresponding bypass valve is quickly opened, including the following steps:

[0079] When the predicted value of the total valve position of the bypass valve is greater than 30%, a bypass valve quick opening signal is generated and output to the first bypass valve; when the predicted value of the total valve position of the bypass valve is less than 25%, the bypass valve quick opening signal output to the first bypass valve is reset;

[0080] When the predicted value of the total valve position of the bypass valve is greater than 55%, a bypass valve quick opening signal is generated and output to the second bypass valve exhaust valve; when the predicted value of the total valve position of the bypass valve is less than 50%, the bypass valve quick opening signal output to the second bypass valve is reset;

[0081] When the predicted value of the total valve position of the bypass valve is greater than 80%, a bypass valve quick opening signal is generated and output to the third bypass valve; when the predicted value of the total valve position of the bypass valve is less than 75%, the bypass valve quick opening signal output to the third bypass valve is reset;

[0082] When the predicted approximate value of the total valve position of the bypass valve is greater than 105%, a bypass valve quick-opening signal is generated and output to the fourth bypass valve; when the predicted approximate value of the total valve position of the bypass valve is less than 1005%, the bypass valve quick-opening signal output to the fourth bypass valve is reset.

[0083] In this embodiment, as one of the achievable methods, PID calculates the set value of the bypass valve total valve position according to the difference between the main steam header pressure measurement value and the main steam header pressure set value, including the following steps:

[0084] Set the target value of main steam header pressure;

[0085] Set the rate of change from the main steam header pressure set value to the main steam header pressure target value;

[0086] generating a main steam header pressure setting value according to a rate of change from the main steam header pressure setting value to the main steam header pressure target value;

[0087] Obtain the measured value of the main steam header pressure; calculate the set value of the bypass valve total valve position according to the difference between the measured value of the main steam header pressure and the set value of the main steam header pressure.

[0088] In this embodiment, as one of the achievable methods, PID sets the target value of the main steam header pressure, including the following steps:

[0089] When the main steam header pressure target value is set manually, the main steam header pressure target value input by the operator will be used as the manually set main steam header pressure target value;

[0090] When the main steam header target value is automatically set by internal setting, the main steam header pressure target value is automatically set to 13.7MPa;

[0091] When the main steam manifold target value is automatically set by external setting, the main steam manifold pressure target value input by the operator will be used as the automatically set main steam manifold pressure target value.

[0092] In this embodiment, as one of the achievable ways, the rate of change from the main steam header pressure setting value to the main steam header pressure target value is infinite.

[0093] In this embodiment, as one of the achievable ways, when the turbine trip signal is within 0.5s, the PID takes the smaller of the generated main steam header pressure setting value and 13MPa as the main steam header pressure setting value.

[0094] When the steam turbine trips, the set value of the main steam manifold pressure is directly reduced to 13MPa, which reduces the set value of the main steam manifold pressure in advance. It also shortens the adjustment time during the PID regulation of the bypass valve position and avoids excessive fluctuations in the main steam pressure.

[0095] In this embodiment, as one of the achievable methods, when any of the following three conditions is met, the bypass valve position setting value calculated by PID is limited to increase, so as to prevent the turbine bypass system pressure from oscillating:

[0096] (1) The turbine trip signal is within 0.5s;

[0097] (2) There is no turbine trip signal, the bypass valve position setting value is less than 0, and the measured value of the main steam header pressure is less than the set value;

[0098] (3) The turbine speed is less than 100 rpm, the bypass valve position setting value is less than 0, and the measured value of the main steam header pressure is less than the set value.

[0099] When the turbine trip signal is within 0.5s, the bypass valve position setting value calculated by PID is limited to increase in order to avoid sudden action of the bypass valve caused by the instantaneous change of the bypass valve position setting value when the turbine trips.

[0100] In this embodiment, as one of the achievable ways, when there is a fault signal of all the pressure transmitters of the main steam header, the bypass valve position is controlled by the bypass valve position control signal generated by the locking PID according to the calculated bypass valve position setting value, and the bypass valve position is controlled by the bypass valve position control signal generated by the bypass valve position setting value manually input by the operator;

[0101] When there is a signal that all the pressure transmitters in the main steam manifold have failed, the bypass valve position control signal generated by the PID according to the calculated bypass valve position setting value is unlocked to control the bypass valve position, and the bypass valve position control signal generated by the PID according to the calculated bypass valve position setting value is used again to control the bypass valve position.

[0102] In this embodiment, as one of the achievable methods, a plurality of bypass valves connected in parallel are provided in the turbine bypass system, and the plurality of bypass valves are put into regulation at the same time;

[0103] PID calculates the set value of the bypass valve position based on the equation function f(x) according to the set value of the bypass valve total valve position;

[0104] f(x)=[min(nx-(n-1)×100,100); max(nx-(n-1)×100,0)];

[0105] Wherein, f(x) is the setting value of the bypass valve position, the minimum setting value of the bypass valve position is the smaller value between nx-(n-1)×100 and 100, the maximum setting value of the bypass valve position is the larger value between nx-(n-1)×100 and 0, x is the setting value of the total valve position of the bypass valve, and n is the number of bypass valves.

[0106] refer to Figure 2 As an implementation of the above method, the present invention provides an embodiment of a pressure control device for a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor. The embodiment of the device corresponds to the embodiment of the pressure control method for a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor. The device can be specifically applied to various electronic devices.

[0107] The pressure control device for the steam turbine bypass system under transient operating conditions of the sodium-cooled fast reactor described in this embodiment includes:

[0108] The prediction module is used to predict the approximate value of the bypass valve total valve position corresponding to the amount of steam that needs to pass through the turbine bypass system under the transient operating condition of the sodium-cooled fast reactor; based on the predicted approximate value of the bypass valve total valve position, generate a bypass valve quick opening signal and output it to the corresponding bypass valve, so as to quickly open the corresponding bypass valve;

[0109] PID, used to calculate the set value of the bypass valve total valve position according to the difference between the main steam header pressure measurement value and the main steam header pressure set value; calculate the set value of the bypass valve position according to the bypass valve total valve position set value; generate the bypass valve position control signal according to the bypass valve position set value and output it to each bypass valve, adjust the valve position of each bypass valve, and maintain the main steam header pressure at the set value;

[0110] The increase limit module is used to limit the increase of the bypass valve position setting value calculated by PID;

[0111] The locking module is used to lock or unlock the bypass valve position control signal generated by the PID according to the bypass valve position setting value calculated to control the bypass valve position; the bypass valve position is controlled by the bypass valve position control signal generated by the bypass valve position setting value manually input by the operator;

[0112] When the set value of the bypass valve total valve position calculated by PID is less than the predicted approximate value of the bypass valve total valve position, the predicted approximate value of the bypass valve total valve position is used as the set value of the bypass valve total valve position.

[0113] As an implementation of the above method, the present invention provides an embodiment of a computer device, and the embodiment of the computer device corresponds to the embodiment of the above method for controlling the pressure of a turbine bypass system under transient conditions of a sodium-cooled fast reactor.

[0114] See also Figure 3 The computer device described in this embodiment includes a memory, a processor and a network interface that are interconnected and communicated through a system bus. It should be noted that the figure only shows a computer device with a memory, a processor and a network interface, but it should be understood that it is not required to implement all the components shown, and more or fewer components can be implemented instead. Among them, those skilled in the art can understand that the computer device here is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to microprocessors, application-specific integrated circuits, programmable gate arrays, digital processors, embedded devices, etc.

[0115] The computer device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The computer device may interact with a user through a keyboard, a mouse, a remote controller, a touch pad, or a voice control device.

[0116] The memory includes at least one type of readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory, random access memory, static random access memory, read-only memory, electrically erasable programmable read-only memory, programmable read-only memory, magnetic memory, disk, optical disk, etc. In some embodiments, the memory may be an internal storage unit of the computer device, such as a hard disk or memory of the computer device. In other embodiments, the memory may also be an external storage device of the computer device, such as a plug-in hard disk, smart memory card, secure digital card, flash memory card, etc. equipped on the computer device. Of course, the memory may also include both the internal storage unit of the computer device and its external storage device. In this embodiment, the memory is generally used to store the operating system and various application software installed on the computer device, such as the computer-readable instructions of the pressure control method of the turbine bypass system under the transient working condition of the sodium-cooled fast reactor. In addition, the memory may also be used to temporarily store various types of data that have been output or are to be output.

[0117] In some embodiments, the processor may be a central processing unit, a controller, a microcontroller, a microprocessor, or other data processing chip. The processor is generally used to control the overall operation of the computer device. In this embodiment, the processor is used to run the computer-readable instructions stored in the memory or process data, such as running the computer-readable instructions of the steam turbine bypass system pressure control method under the tight transient condition of the sodium-cooled fast reactor.

[0118] The network interface may include a wireless network interface or a wired network interface, which is generally used to establish a communication connection between the computer device and other electronic devices.

[0119] The method, device, computer equipment and storage device for controlling the pressure of the steam turbine bypass system under the transient working condition of the sodium-cooled fast reactor of the present embodiment, at the moment when the transient working condition of the sodium-cooled fast reactor occurs, according to the difference between the average thermal power of the double-loop of the sodium-cooled fast reactor reactor and the power of the three-loop of the sodium-cooled fast reactor, the approximate value of the total valve position of the bypass valve corresponding to the amount of steam that needs to pass through the steam turbine bypass system is quickly predicted by the empirical function of the sodium-cooled fast reactor unit, which is equivalent to predicting the output value of the total valve position of the bypass valve in advance; according to the approximate value of the total valve position of the bypass valve, the corresponding bypass valve is interlocked for quick opening, which is equivalent to directly adjusting the output value of the bypass valve position to the predicted value; on the basis that some bypass valves have been quickly opened to the predicted value, the bypass valve position is adjusted by PID to achieve precise control of the main steam header pressure, which greatly reduces the PI D adjusts the initial error between the output value of the bypass valve position and the set value, greatly reducing the overshoot and adjustment time during PID regulation of the bypass valve position, so as to achieve control of the main steam pressure through the turbine bypass system after the transient operating condition of the sodium-cooled fast reactor occurs, avoiding the main steam pressure coupled oscillation; PID takes the smaller of the set value of the bypass valve total valve position and the approximate value of the bypass valve total valve position, and generates a bypass valve position control signal to control the bypass valve position, which can prevent PID from outputting a closing signal to the bypass valve that is about to open; when the turbine trips, the set value of the main steam manifold pressure is directly reduced to 13MPa, so that the set value of the main steam manifold pressure is reduced in advance, which also shortens the adjustment time during PID regulation of the bypass valve position and avoids excessive oscillation of the main steam pressure.

[0120] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor, characterized in that: The steps include: Under the transient condition of sodium-cooled fast reactor, the approximate value of the total valve position of the bypass valve corresponding to the amount of steam that needs to pass through the turbine bypass system is predicted; According to the predicted approximate value of the total valve position of the bypass valve, a bypass valve quick opening signal is generated and output to the corresponding bypass valve, so as to quickly open the corresponding bypass valve; PID calculates the set value of the bypass valve total valve position according to the difference between the measured value of the main steam header pressure and the set value of the main steam header pressure; calculates the set value of the bypass valve position according to the set value of the bypass valve total valve position; generates a bypass valve position control signal according to the set value of the bypass valve position and outputs it to each bypass valve, adjusts the valve position of each bypass valve, and maintains the main steam header pressure at the set value; When the set value of the bypass valve total valve position calculated by PID is less than the predicted approximate value of the bypass valve total valve position, the predicted approximate value of the bypass valve total valve position is used as the set value of the bypass valve total valve position.

2. The method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to claim 1, characterized in that: Under the transient operating condition of a sodium-cooled fast reactor, the approximate value of the total valve position of the bypass valve corresponding to the amount of steam required to pass through the turbine bypass system is predicted, including the following steps: Under the transient condition of the sodium-cooled fast reactor, according to the difference between the average thermal power of the double-loop of the sodium-cooled fast reactor and the power of the three-loop of the sodium-cooled fast reactor, the approximate value of the total valve position of the bypass valve corresponding to the amount of steam that needs to pass through the turbine bypass system is predicted by the sodium-cooled fast reactor unit commissioning empirical function.

3. The method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to claim 2, characterized in that: The transient operating conditions of sodium-cooled fast reactors include turbine tripping, turbine load rejection, and sudden closure of turbine control valves; the empirical functions of sodium-cooled fast reactor unit commissioning include F(x1) and F(x2); Under the condition of turbine tripping, the approximate value of the total valve position of the bypass valve is predicted based on F(x1); under the condition of turbine load rejection and sudden closure of the turbine regulating valve, the approximate value of the total valve position of the bypass valve is predicted based on F(x2); F(x1) is: y1=0.4853x1+17, 17%≤y1≤50%; 32%≤x1≤100%, where y1 is The approximate value of the total valve position of the bypass valve, x1 is the average thermal power percentage of the double loop of the sodium-cooled fast reactor; F(x2) is: y2=0.5556x2-5.5556, 0%≤y2≤50%; 10%≤x2≤100%, where y2 is the approximate value of the total valve position of the bypass valve, and x2 is the deviation percentage between the average thermal power of the double loop of the sodium-cooled fast reactor reactor and the power of the three loops of the sodium-cooled fast reactor.

4. The method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to claim 1, characterized in that: According to the predicted approximate value of the total valve position of the bypass valve, a bypass valve quick opening signal is generated and output to the corresponding bypass valve, and the corresponding bypass valve is quickly opened, including the following steps: When the predicted value of the total valve position of the bypass valve is greater than 30%, a bypass valve quick opening signal is generated and output to the first bypass valve; when the predicted value of the total valve position of the bypass valve is less than 25%, the bypass valve quick opening signal output to the first bypass valve is reset; When the predicted value of the total valve position of the bypass valve is greater than 55%, a bypass valve quick opening signal is generated and output to the second bypass valve exhaust valve; when the predicted value of the total valve position of the bypass valve is less than 50%, the bypass valve quick opening signal output to the second bypass valve is reset; When the predicted value of the total valve position of the bypass valve is greater than 80%, a bypass valve quick opening signal is generated and output to the third bypass valve; when the predicted value of the total valve position of the bypass valve is less than 75%, the bypass valve quick opening signal output to the third bypass valve is reset; When the predicted approximate value of the total valve position of the bypass valve is greater than 105%, a bypass valve quick-opening signal is generated and output to the fourth bypass valve; when the predicted approximate value of the total valve position of the bypass valve is less than 1005%, the bypass valve quick-opening signal output to the fourth bypass valve is reset.

5. The method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to claim 1, characterized in that: PID calculates the set value of the bypass valve total valve position according to the difference between the main steam header pressure measurement value and the main steam header pressure set value, including the following steps: Set the target value of main steam header pressure; Set the rate of change from the main steam header pressure set value to the main steam header pressure target value; generating a main steam header pressure setting value according to a rate of change from the main steam header pressure setting value to the main steam header pressure target value; Obtain the measured value of the main steam header pressure; calculate the set value of the bypass valve total valve position according to the difference between the measured value of the main steam header pressure and the set value of the main steam header pressure.

6. The method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to claim 5, characterized in that: PID sets the target value of the main steam header pressure, including the following steps: When the main steam header pressure target value is set manually, the main steam header pressure target value input by the operator will be used as the manually set main steam header pressure target value; When the main steam header target value is automatically set by internal setting, the main steam header pressure target value is automatically set to 13.7MPa; When the main steam manifold target value is automatically set by external setting, the main steam manifold pressure target value input by the operator will be used as the automatically set main steam manifold pressure target value.

7. The method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to claim 5, characterized in that: The rate of change from the main steam header pressure set value to the main steam header pressure target value is infinite.

8. The method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to claim 5, characterized in that: When the turbine trip signal is within 0.5s, PID takes the smaller of the generated main steam header pressure setting value and 13MPa as the main steam header pressure setting value.

9. The method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to claim 5, characterized in that: When any of the following three conditions is met, the bypass valve position setting value calculated by limiting PID increases: (1) The turbine trip signal is within 0.5s; (2) There is no turbine trip signal, the bypass valve position setting value is less than 0, and the measured value of the main steam header pressure is less than the set value; (3) The turbine speed is less than 100 rpm, the bypass valve position setting value is less than 0, and the measured value of the main steam header pressure is less than the set value.

10. The method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to claim 1, characterized in that: When there are fault signals of all the pressure transmitters of the main steam header, the bypass valve position is controlled by the bypass valve position control signal generated by the calculated bypass valve position setting value of the locking PID, and the bypass valve position is controlled by the bypass valve position control signal generated by the bypass valve position setting value manually input by the operator; When there is a signal that all the pressure transmitters in the main steam manifold have failed, the bypass valve position control signal generated by the PID according to the calculated bypass valve position setting value is unlocked to control the bypass valve position, and the bypass valve position control signal generated by the PID according to the calculated bypass valve position setting value is used again to control the bypass valve position.

11. The method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor according to claim 1, characterized in that: PID calculates the set value of the bypass valve position based on the equation function f(x) according to the set value of the bypass valve total valve position; f(x)=[min(nx-(n-1)×100,100); max(nx-(n-1)×100,0)]; Wherein, f(x) is the setting value of the bypass valve position, the minimum setting value of the bypass valve position is the smaller value between nx-(n-1)×100 and 100, the maximum setting value of the bypass valve position is the larger value between nx-(n-1)×100 and 0, x is the setting value of the total valve position of the bypass valve, and n is the number of bypass valves.

12. A pressure control device for a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor, characterized in that: include: A prediction module, used to predict the approximate value of the total valve position of the bypass valve corresponding to the amount of steam that needs to pass through the turbine bypass system under the transient operating condition of the sodium-cooled fast reactor; According to the predicted approximate value of the total valve position of the bypass valve, a bypass valve quick opening signal is generated and output to the corresponding bypass valve, so as to quickly open the corresponding bypass valve; PID, used to calculate the set value of the bypass valve total valve position according to the difference between the main steam header pressure measurement value and the main steam header pressure set value; calculate the set value of the bypass valve position according to the bypass valve total valve position set value; generate the bypass valve position control signal according to the bypass valve position set value and output it to each bypass valve, adjust the valve position of each bypass valve, and maintain the main steam header pressure at the set value; The increase limit module is used to limit the increase of the bypass valve position setting value calculated by PID; The locking module is used to lock or unlock the bypass valve position control signal generated by the PID according to the bypass valve position setting value calculated to control the bypass valve position; the bypass valve position is controlled by the bypass valve position control signal generated by the bypass valve position setting value manually input by the operator; When the set value of the bypass valve total valve position calculated by PID is less than the predicted approximate value of the bypass valve total valve position, the predicted approximate value of the bypass valve total valve position is used as the set value of the bypass valve total valve position.

13. A computer device comprising a memory and a processor, wherein the memory stores computer-readable instructions, characterized in that: When the processor executes the computer-readable instructions, the steps of the method for controlling the pressure of a turbine bypass system under transient conditions of a sodium-cooled fast reactor according to any one of claims 1 to 11 are implemented.

14. A computer-readable storage medium having computer-readable instructions stored thereon, characterized in that: When the computer-readable instructions are executed, the steps of the method for controlling the pressure of a steam turbine bypass system under transient conditions of a sodium-cooled fast reactor as described in any one of claims 1-11 are implemented.

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