CN114321878B - Transient pressure control method for deaerator during large-amplitude load shedding of nuclear power unit - Google Patents
Transient pressure control method for deaerator during large-amplitude load shedding of nuclear power unit Download PDFInfo
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Abstract
The invention belongs to the technical field of deaerator pressure control, and particularly relates to a deaerator transient pressure control method during large-amplitude load shedding of a nuclear power unit. The method comprises the following steps of 1, judging a pressure maintaining mode of a deaerator; step 2, deaerator pressure control maintaining and transition control; and 3, controlling the pressure. The invention can avoid false water level generated by steam pressure change in the deaerator and interfere with normal water level control of the deaerator.
Description
Technical Field
The invention belongs to the technical field of deaerator pressure control, and particularly relates to a deaerator transient pressure control method during large-amplitude load shedding of a nuclear power unit.
Background
In the comprehensive test stage of the nuclear power unit before the operation of a unit manufacturer, when a steam turbine suddenly changes from normal operation to shutdown or island operation, a deaerator water level measuring instrument can cause unreal measured value of the instrument due to rapid change of steam pressure in the deaerator, and false water level is generated. The false water level severely interferes with normal deaerator water level control.
The steam pressure in the deaerator of the unit comes from three branch lines of auxiliary steam, high-pressure cylinder steam exhaust and new steam, and the operation mode is as follows:
1) In the initial stage of starting the unit, only auxiliary steam is used for controlling the steam pressure in the deaerator to be about 0.043 MPa.
2) During the power operation of the unit, when the load is below 30%, the steam pressure in the deaerator is required to be controlled to be about 0.17 MPa. The high-pressure cylinder exhaust pressure and new steam enter the deaerator, and as the high-pressure cylinder exhaust pressure is lower and lower than 0.17MPa at the stage, the new steam inlet with high pressure needs to be controlled by a regulating valve, so that the deaerator pressure is ensured to be about 0.17 MPa;
during the power operation of the unit, when the load is more than 30%, the exhaust pressure of the high-pressure cylinder and new steam enter the deaerator, and the pressure regulating valve in an automatic control state is gradually and completely closed due to the fact that the exhaust pressure of the high-pressure cylinder is higher and higher than 0.17MPa in the stage. At the moment, the steam in the deaerator only comes from one path of steam discharged by the high-pressure cylinder, the path of steam is not controlled, and the deaerator starts to slide and press along with the steam discharging pressure of the high-pressure cylinder.
The unit uses guided wave Lei Celiang deaerator water level, and the principle is that the water level is calculated by utilizing the time difference between radar wave emission and the rebound signal of the radar wave contact water level surface. When the unit is 100% loaded, the pressure of the deaerator is about 0.78 MPa. At this time, if the steam turbine is suddenly changed from a normal state to a shutdown state or an island operation, the pressure of the deaerator is quickly reduced to below 0.17MPa, water in the deaerator is flashed to generate a large amount of bubbles, the generation of the bubbles quickly increases the water surface, and false water level measurement is probably caused.
The original constant value design is as shown in figure 1, the system working conditions are not distinguished, and the control constant values are all 0.17MPa. In order to prevent the deaerator water level from being measured and to generate false water level, the steam pressure in the deaerator needs to be temporarily maintained when the steam turbine is suddenly changed from normal operation to shutdown or island operation, and then the steam pressure is slowly changed to a normal control value.
In order to solve the problem, a deaerator pressure transient control method is required to be invented.
Disclosure of Invention
The invention aims to provide a transient pressure control method for a deaerator during large-amplitude load shedding of a nuclear power unit, which is used for avoiding false water level generated by steam pressure change in the deaerator and interfering normal water level control of the deaerator through reasonable design of deaerator pressure maintaining and pressure control logic.
The invention adopts the technical scheme that:
a transient pressure control method of a deaerator during large-amplitude load shedding of a nuclear power unit comprises the following steps of 1, judging a deaerator pressure maintaining mode; step 2, deaerator pressure control maintaining and transition control; and 3, controlling the pressure.
In the step 1, a deaerator pressure maintaining mode judging unit is additionally arranged, logic judgment is performed by using an AND gate, an OR gate and an NOT gate, the deaerator pressure maintaining mode signal is generated when the deaerator pressure maintaining mode is required in a state is identified, the signal transmission time sequence problem of the deaerator pressure maintaining mode signal is solved, and the erroneous judgment of the pressure maintaining mode during other external logic tests is avoided.
In the deaerator pressure maintaining mode judging unit, a turbine shutdown signal of group A and a turbine shutdown signal of group A are adopted to judge the turbine shutdown by adopting a first AND gate logic; b, judging the shutdown of the steam turbine by adopting a second AND gate logic according to the shutdown signals of the steam turbine of the B group and the shutdown signals of the steam turbine of the B group; the shutdown signal and the shutdown signal adopt a third AND gate logic to judge whether to shutdown or not; the first AND gate, the second AND gate, the steam turbine island operation signal and the steam turbine island operation signal adopt OR gate logic; the third AND gate passes through NOT gate logic; and after the OR gate is delayed for 1 second, the NAND gate adopts a fourth AND gate to obtain the pressure maintaining mode signal of the deaerator.
The step 1 specifically comprises three working conditions, namely, a first working condition: when the steam turbine is not stopped, the reactor is not stopped, and the steam turbine suddenly changes from normal operation to island operation; working condition II: when the reactor is not shut down, the steam turbine suddenly rotates from normal operation to shutdown; and (3) working condition III: when the reactor is switched from normal operation to shutdown, the steam turbine is switched from normal operation to shutdown.
The working condition one comprises the following steps:
step 1: the deaerator pressure maintaining mode judging unit receives a steam turbine island operation signal and a steam turbine island operation signal from external logic, and the steam turbine island operation signal are inverted from 0 to 1 and sent to an OR gate input end;
Step 2: because at least one of the input conditions of the OR gate is met, the output of the OR gate is 1, and the OR gate is sent to the input end of the delay module;
step 3: the output of the delay module is 1 after one second, and the output is sent to the input end of the fourth AND gate;
the method comprises the following steps: the shutdown signal and the shutdown signal are both 0 at the moment, the output 0 of the third AND gate is sent to the input end of the NOT gate, the output of the NOT gate is 1, and the output of the NOT gate is sent to the input end of the fourth AND gate;
step 5: and if the two input conditions of the fourth AND gate are 1, the output of the fourth AND gate is 1, and a deaerator pressure maintaining mode signal is generated.
The second working condition comprises the following steps:
step 1: generating a shutdown signal of the turbine A and a shutdown signal of the turbine A, wherein the shutdown signals are inverted from 0 to 1, and then the output of the first AND gate is 1 and sent to the input end of the OR gate;
step 2: generating a shutdown signal of the turbine of the group B and a shutdown signal of the turbine of the group B, wherein the shutdown signals are inverted from 0 to 1, and then the output of the second AND gate is 1 and sent to the input end of the OR gate;
step 3: because at least one of the input conditions of the OR gate is met, the output of the OR gate is 1, and the OR gate is sent to the input end of the delay module;
step 4: the output of the delay module is 1 after one second, and the output is sent to the input end of the fourth AND gate;
the method comprises the following steps: the shutdown signal and the shutdown signal are both 0 at the moment, the output 0 of the third AND gate is sent to the input end of the NOT gate, the output of the NOT gate is 1, and the output of the NOT gate is sent to the input end of the fourth AND gate;
Step 6: and if the two input conditions of the fourth AND gate are 1, the output of the AND gate is 1, and a deaerator pressure maintaining mode signal is generated.
The third working condition comprises the following steps:
step 1: generating a shutdown signal and a shutdown signal, wherein the shutdown signal and the shutdown signal are inverted from 0 to 1, and then the Siam AND gate output 1 is sent to the NOT gate input end, the NOT gate output is 0, and is sent to the input end 1 of the fourth AND gate;
step 2: generating a shutdown signal of the turbine A and a shutdown signal of the turbine A, wherein the shutdown signals are inverted from 0 to 1, and then the output of the first AND gate is 1 and sent to the input end of the OR gate;
step 3: generating a shutdown signal of the turbine of the group B and a shutdown signal of the turbine of the group B, wherein the shutdown signals are inverted from 0 to 1, and then the output of the second AND gate is 1 and sent to the input end of the OR gate;
step 4: because at least one of the input conditions of the OR gate is met, the output of the OR gate is 1, and the OR gate is sent to the input end of the delay module;
step 5: the output of the delay module is 1 after one second, and the output is sent to the input end 2 of the fourth AND gate; because of the effect of the time delay module, the input end of the fourth AND gate is inverted from 1 to 0 before transition, the condition that two input conditions are simultaneously met cannot occur, the output of the fourth AND gate is 0, and a deaerator pressure maintaining mode signal is not generated.
In the step 2, a deaerator pressure control maintaining and transition unit is additionally arranged, and when the steam turbine is suddenly changed from normal operation to shutdown or island operation by utilizing a switching module, a pulse module and a speed limit module, the steam pressure in the deaerator is maintained within 600 seconds, and then the steam turbine is slowly transited to a normal control value at a speed of 0.126 MPa/min; a final deaerator pressure regulation setpoint is generated that is used by the pressure control logic.
The deaerator pressure signal comes from the on-site measured value; the deaerator pressure maintaining mode signal is from a deaerator pressure maintaining mode judging unit, and the signal is used for controlling a 600 second pulse signal of the trigger pulse module and a 900 second pulse signal of the pulse module; the 600 second pulse signal output by the pulse module is used for controlling the switching selection of the switching module and the switching module; the 900 second pulse signal output by the pulse module is used for controlling the switching selection of the switching module; the switching module is used for selecting the measured pressure of the deaerator and the measured pressure of the deaerator at the previous moment, and realizing the function of memorizing the measured pressure of the deaerator when receiving the 600 second pulse signal output by the pulse module; the switching module is used for selecting the output value of the switching module and the normal set value of 0.17MPa, and switching the set value from 0.17MPa to the output value of the switching module when receiving the 600 second pulse signal output by the pulse module; the rate module is used for controlling the rate of change of the output value of the switching module; the switching module is used for selecting the output value of the speed module and the normal set value of 0.17MPa, and switching the set value from 0.17MPa to the output value of the speed module when the 900 second pulse signal output by the pulse module is received, so that the deaerator pressure regulation set value is finally generated.
The step 2 specifically comprises two working conditions, namely, a first working condition: the unit normally operates, and a deaerator pressure maintaining mode signal is not triggered; working condition II: assuming that the unit normally operates under 100% load, an abnormal condition happens suddenly, so that the deaerator pressure maintaining mode judging unit generates a deaerator pressure maintaining mode signal.
The working condition one comprises the following steps:
step 1: the deaerator pressure control maintaining and transition unit does not receive the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the first pulse module cannot trigger 600 seconds of pulse, the output is 0, and the signal is transmitted to the first switching module and the second switching module;
step 2: the deaerator pressure control maintaining and transition unit does not receive the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the second pulse module cannot trigger 900 second pulse, the output is 0, and the output is transmitted to the third switching module;
step 3: the first switching module is provided with two paths of input signals, one path is the actual pressure of the deaerator, the other path is the output value of the first switching module, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 0, and the first switching module selects the actual deaerator pressure as output and transmits the actual deaerator pressure to the second switching module;
Step 4: the second switching module has two paths of input signals, one path is the output of the first switching module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 0, and the second switching module selects the normal operation pressure set value of 0.17MPa as output and transmits the output to the rate limiting module;
step 5: the rate limiting module receives the output value of 0.17MPa from the second switching module, and the output value of the rate limiting module is also 0.17MPa when no change occurs;
step 6: the third switching module is provided with two paths of input signals, one path is the output of the rate limiting module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the second pulse module; and if the signal from the second pulse module is 0, the third switching module selects the normal operation pressure set value of 0.17MPa as output, forms a deaerator pressure regulation set value and transmits the deaerator pressure regulation set value to the pressure control logic.
The second working condition comprises the following steps:
step 1: the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the first pulse module triggers 600 second pulse, the output is 1, and the signal is transmitted to the first switching module and the second switching module;
Step 2: the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the second pulse module triggers 900 second pulse, the output is 1, and the signal is transmitted to the third switching module;
step 3: the first switching module is provided with two paths of input signals, one path is the actual pressure of the deaerator, the other path is the output value of the first switching module, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 1, the first switching module selects the output value of the switching module as output within 600 seconds and transmits the output value to the second switching module;
step 4: the second switching module has two paths of input signals, one path is the output of the first switching module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 0, the second switching module selects the output value of the first switching module as output within 600 seconds and transmits the output value to the rate limiting module;
step 5: the speed limiting module receives an output value from the second switching module, the input value of the speed limiting module is changed from 0.17MPa to the real pressure of the deaerator at the previous moment, the input value of the speed limiting module is changed from small to large, and the speed limiting module changes the output value from 0.17MPa to the real pressure of the deaerator at the previous moment according to the speed of 9999MPa per minute;
Step 6: the third switching module is provided with two paths of input signals, one path is the output of the rate limiting module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the second pulse module; the signal from the second pulse module is 1, and the third switching module selects the output value of the speed limiting module as output within 900 seconds to form a deaerator pressure regulation set value and transmits the deaerator pressure regulation set value to the pressure control logic;
step 7: the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal 601-900 seconds from the deaerator pressure maintaining mode judging unit, and the output of the first pulse module is changed from 1 to 0;
step 8: the first switching module is provided with two paths of input signals, one path is the actual pressure of the deaerator, the other path is the output value of the first switching module, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 0, and the first switching module selects the actual deaerator pressure as output and transmits the actual deaerator pressure to the second switching module;
step 9: the second switching module has two paths of input signals, one path is the output of the first switching module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 0, the second switching module selects the output value of the first switching module as output within 600 seconds and transmits the output value to the rate limiting module;
Step 10: the speed limiting module receives an output value from the second switching module, the input value of the speed limiting module is changed from the real pressure of the deaerator to 0.17MPa, the input value of the speed limiting module is changed from large to small, and the speed limiting module slowly changes the output value from the real pressure of the deaerator to 0.17MPa according to the speed of 0.126MPa per minute;
step 11: the third switching module is provided with two paths of input signals, one path is the output of the rate limiting module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the second pulse module; and if the signal from the second pulse module is 1, the third switching module selects the output value of the speed limiting module as output within 601-900 seconds to form a deaerator pressure regulation set value and transmit the deaerator pressure regulation set value to the pressure control logic.
In the step 3, the principle is to perform conventional PID control according to the deviation between the set value and the actual measured value.
Compared with the prior art, the invention has the beneficial effects that:
(1) The transient pressure control method for the deaerator during the large-amplitude load shedding of the nuclear power unit provided by the invention has the advantages that the pressure maintaining working condition of the deaerator under the logic condition is simply and effectively judged, and the possible state of misjudgment of the pressure maintaining of the deaerator is eliminated;
(2) The transient pressure control method for the deaerator during the large-amplitude load shedding of the nuclear power unit provided by the invention realizes the pressure maintenance and stable transition of the deaerator;
(3) The transient pressure control method for the deaerator during the large-amplitude load shedding of the nuclear power unit provided by the invention has the advantages that the distortion of the deaerator water level measurement signal caused by sudden drop of the steam pressure in the deaerator is avoided, and the normal water level adjustment of the deaerator is ensured.
Drawings
Fig. 1: a control schematic diagram in the prior art;
fig. 2: the control schematic diagram of the invention;
fig. 3: a deaerator pressure maintaining mode judging unit schematic diagram;
fig. 4: deaerator pressure control hold and transition unit schematic.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in FIG. 2, the transient pressure control method for the deaerator during the large-amplitude load shedding of the nuclear power unit provided by the invention comprises the following steps of step 1, deaerator pressure maintaining mode judgment; step 2, deaerator pressure control maintaining and transition control; and 3, controlling the pressure.
Wherein, step 1: the deaerator pressure maintaining mode judging unit is additionally arranged, and the function of the deaerator pressure maintaining mode judging unit is to utilize an AND gate, an OR gate and a NOT gate to carry out logic judgment as shown in fig. 3, identify what state the deaerator pressure maintaining is needed under, generate a deaerator pressure maintaining mode signal, solve the problem of signal transmission time sequence of the deaerator pressure maintaining mode, and avoid misjudgment of the pressure maintaining mode when other external logic tests are carried out.
As shown in FIG. 3, group A has two turbine shutdown signals 1 and 2, which are TURE when the turbine is actually shutdown, and can be used to characterize the turbine shutdown. However, when the unit normally operates, one of the two signals is reversed during the periodical test, and if one signal is adopted, the steam turbine is considered to be stopped, so that erroneous judgment is caused to generate the deaerator pressure maintaining signal. Therefore, the group A has two turbine shutdown signals 1 and 2, and logic is needed to be adopted, so that the turbine shutdown is ensured to be judged, and the pressure maintaining mode is avoided from being generated by misjudgment.
The group B has two turbine shutdown signals 1 and 2, the two shutdown signals 1 and 2 also adopt AND logic, and the principle is the same as that of the group A, and the two turbine shutdown signals 1 and 2 are provided.
Since there is no new steam source once a shutdown occurs suddenly and again, the deaerator pressure maintaining mode cannot be triggered at this time in order not to cause the primary circuit to be supercooled. However, the shutdown signal has the potential to trigger earlier than the shutdown signal, and once so, this logic triggers the deaerator hold mode. Therefore, a one-second delay module is added in the unit 2, so that the shutdown signal is ensured to be later than the triggering of the shutdown signal, and the false triggering of the deaerator pressure maintaining mode is avoided.
Step 2: the deaerator pressure control maintaining and transition unit is additionally arranged, and the function of the deaerator pressure control maintaining and transition unit is that a switching module, a pulse module and a speed limit module are utilized, so that when the steam turbine is suddenly changed into shutdown or island operation from normal operation, the steam pressure in the deaerator is maintained within 600 seconds, and then the steam turbine is slowly transited to a normal control value at a speed of 0.126 MPa/min. A final deaerator pressure regulation setpoint is generated that is used by the pressure control logic.
Step 3: the pressure control is based on the principle that conventional PID control is performed according to the deviation between the set value and the measured value.
The invention is further described by the following drawings and detailed embodiments, the general flow is shown in fig. 2, the unit 1 firstly judges whether the deaerator pressure maintaining mode is performed, then the unit 2 calculates and generates a deaerator pressure control set value according to the deaerator pressure maintaining mode signal of the unit 1, and finally the pressure control logic performs conventional PID control according to the set value of the unit 2. The specific unit 1 corresponds to three working conditions respectively, and the unit 2 corresponds to two working conditions respectively, and is specifically as follows:
when the unit 1 is actually operated, three working conditions can be generated, and as shown in fig. 3, the following working conditions are respectively described:
Working condition 1: when the steam turbine is not stopped, the reactor is not stopped, and the steam turbine suddenly changes from normal operation to island operation. Under the working condition, the signal transmission of the deaerator pressure maintaining mode judging unit is as follows:
step 1: the unit 1 receives an island operation signal 1 and an island operation signal 2 from external logic, which are inverted from 0 to 1 and sent to an OR gate input terminal;
step 2: because at least one of the input conditions of the OR gate is met, the output of the OR gate is 1, and the OR gate is sent to the input end of the delay module;
step 3: the output of the delay module is 1 after one second, and the output is sent to the input end of the fourth AND gate;
the method comprises the following steps: when the shutdown signal 1 and the shutdown signal 2 are both 0, the output 0 of the AND gate 3 is sent to the input end of the NOT gate, the output 1 of the NOT gate is sent to the input end of the AND gate 4;
step 5: and the two input conditions of the AND gate 4 are 1, and the output of the AND gate is 1, so that a deaerator pressure maintaining mode signal is generated.
Working condition 2: when the reactor is not shut down, the turbine suddenly goes from normal operation to shutdown. Under the working condition, the signal transmission of the deaerator pressure maintaining mode judging unit is as follows:
step 1: generating a turbine shutdown signal 1 of the A group and a turbine shutdown signal 2 of the A group, wherein the turbine shutdown signals are inverted from 0 to 1, and then the AND gate 1 outputs 1 and is sent to the input end of the OR gate;
Step 2: generating a shutdown signal 1 of the turbine of the B group and a shutdown signal 2 of the turbine of the B group, wherein the shutdown signals are inverted from 0 to 1, and then the AND gate 2 outputs 1 and sends the signals to the input end of the OR gate;
step 3: because at least one of the input conditions of the OR gate is met, the output of the OR gate is 1, and the OR gate is sent to the input end of the delay module;
step 4: the output of the delay module is 1 after one second, and the output is sent to the input end of the AND gate 4;
the method comprises the following steps: when the shutdown signal 1 and the shutdown signal 2 are both 0, the output 0 of the AND gate 3 is sent to the input end of the NOT gate, the output 1 of the NOT gate is sent to the input end of the AND gate 4;
step 6: and the two input conditions of the AND gate 4 are 1, and the output of the AND gate is 1, so that a deaerator pressure maintaining mode signal is generated.
Working condition 3: when the reactor is switched from normal operation to shutdown, the steam turbine is switched from normal operation to shutdown. Under the working condition, the signal transmission of the deaerator pressure maintaining mode judging unit is as follows:
step 1: generating a shutdown signal 1 and a shutdown signal 2, which are inverted from 0 to 1, and the output 1 of the AND gate 3 is sent to the NOT gate input terminal, the NOT gate output is 0, and is sent to the input terminal 1 of the AND gate 4;
step 2: generating a turbine shutdown signal 1 of the A group and a turbine shutdown signal 2 of the A group, wherein the turbine shutdown signals are inverted from 0 to 1, and then the AND gate 1 outputs 1 and is sent to the input end of the OR gate;
Step 3: generating a shutdown signal 1 of the turbine of the B group and a shutdown signal 2 of the turbine of the B group, wherein the shutdown signals are inverted from 0 to 1, and then the AND gate 2 outputs 1 and sends the signals to the input end of the OR gate;
step 4: because at least one of the input conditions of the OR gate is met, the output of the OR gate is 1, and the OR gate is sent to the input end of the delay module;
step 5: after one second the delay module output is 1 and is fed to the input 2 of the and gate 4. Because of the effect of the delay module, the input end 2 of the AND gate 4 is inverted from 1 to 0 before the input end 1 of the AND gate 4 is converted, so that the condition that two input conditions are simultaneously met cannot occur, the output of the AND gate 4 is 0, and a deaerator pressure maintaining mode signal is not generated.
When the unit 2 is actually operated, two working conditions can be generated, and as shown in fig. 4, the following working conditions are respectively described:
working condition 1: when the unit is in normal operation and the deaerator pressure maintaining mode signal is not triggered (namely, the working condition 3 of the unit 1 is matched), the deaerator pressure is controlled and kept as follows with the signal transmission of the transition unit:
step 1: the deaerator pressure control maintaining and transition unit does not receive the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the pulse module 1 cannot trigger 600 seconds of pulse, the output is 0, and the pulse module is transmitted to the first switching module and the switching module 2;
Step 2: the deaerator pressure control maintaining and transition unit does not receive the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the pulse module 2 cannot trigger 900 seconds of pulse, the output is 0, and the pulse module is transmitted to the switching module 3;
step 3: the switching module 1 has two paths of input signals, one path is the actual pressure of the deaerator, the other path is the output value of the switching module 1, and the output value of the pulse module 1 is selected where one of the two paths of input signals is used as the output. The signal from the pulse module 1 is 0, the switching module 1 selects the actual deaerator pressure as output and transmits the actual deaerator pressure to the switching module 2;
step 4: the switching module 2 has two paths of input, one path is the output of the switching module 1, the other path is the normal operation pressure set value of 0.17MPa, and the output value of the pulse module 1 is selected where one of the two paths of input signals is used as the output. The signal from the pulse module 1 is 0, and the switching module 2 selects the normal operation pressure set value of 0.17MPa as output and transmits the output to the rate limiting module;
step 5: the rate limiting module receives the output value of 0.17MPa from the switching module 2, and the output value of the rate limiting module is also 0.17MPa when no change occurs;
Step 6: the switching module 3 has two inputs, one is the output of the rate limiting module, the other is the normal operation pressure set value of 0.17MPa, and the output value of the pulse module 2 is selected where one of the two input signals is used as the output. The signal from the pulse module 2 is 0, the switching module 3 selects the normal operating pressure set point of 0.17MPa as output, forms the deaerator pressure regulation set point and transmits to the pressure control logic.
Working condition 2: assuming that the unit normally operates under 100% load and an abnormal condition happens suddenly, when the deaerator pressure maintaining mode judging unit generates a deaerator pressure maintaining mode signal (namely, working condition 1 or working condition 2 of the matching unit 1), the deaerator pressure control keeps the following signal transmission with the transition unit:
step 1: the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the pulse module 1 triggers 600 seconds of pulse, the output is 1, and the pulse is transmitted to the switching module 1 and the switching module 2;
step 2: the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the pulse module 2 triggers 900 seconds of pulse, the output is 1, and the pulse is transmitted to the switching module 3;
Step 3: the switching module 1 has two paths of input signals, one path is the actual pressure of the deaerator, the other path is the output value of the switching module 1, and the output value of the pulse module 1 is selected where one of the two paths of input signals is used as the output. The signal from the pulse module 1 is 1, the switching module 1 selects the output value of the switching module as output (since the output value of the switching module 1 is the actual pressure of the deaerator at the previous moment, which is equivalent to the actual pressure of the deaerator at the previous moment being kept as output), and transmits the output value to the switching module 2;
step 4: the switching module 2 has two paths of input, one path is the output of the switching module 1, the other path is the normal operation pressure set value of 0.17MPa, and the output value of the pulse module 1 is selected where one of the two paths of input signals is used as the output. The signal from the pulse module 1 is 0, the 600 second switching module 2 selects the output value of the switching module 1 as output and transmits the output value to the rate limiting module;
step 5: the speed limiting module receives an output value from the switching module 2, the input value of the speed limiting module is changed from 0.17MPa to the real pressure of the deaerator at the previous moment (about 0.78 MPa), the input value of the speed limiting module is changed from small to large, and the speed limiting module changes the output value from 0.17MPa to the real pressure of the deaerator at the previous moment according to the speed of 9999MPa per minute (which is equivalent to not carrying out speed limiting when the speed is changed from small to large);
Step 6: the switching module 3 has two inputs, one is the output of the rate limiting module, the other is the normal operation pressure set value of 0.17MPa, and the output value of the pulse module 2 is selected where one of the two input signals is used as the output. The signal from pulse module 2 is 1 and then the 900 second switch module 3 selects the output value of the rate limiting module as output, forming the deaerator pressure regulation setpoint and passing to the pressure control logic.
The signal transmission shows that the pressure regulation set value of the deaerator under the working condition is the actual deaerator pressure at the moment before the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, and the deaerator pressure maintaining control function is completed in the steps above for 600 seconds.
Step 7: the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal 601-900 seconds from the deaerator pressure maintaining mode judging unit, and the output of the pulse module 1 is changed from 1 to 0;
step 8: the switching module 1 has two paths of input signals, one path is the actual pressure of the deaerator, the other path is the output value of the switching module 1, and the output value of the pulse module 1 is selected where one of the two paths of input signals is used as the output. The signal from the pulse module 1 is 0, the switching module 1 selects the actual deaerator pressure as output and transmits the actual deaerator pressure to the switching module 2;
Step 9: the switching module 2 has two paths of input, one path is the output of the switching module 1, the other path is the normal operation pressure set value of 0.17MPa, and the output value of the pulse module 1 is selected where one of the two paths of input signals is used as the output. The signal from the pulse module 1 is 0, the 600 second switching module 2 selects the output value of the switching module 1 as output and transmits the output value to the rate limiting module;
step 10: the speed limiting module receives an output value from the switching module 2, the input value of the speed limiting module is converted into 0.17MPa from the real pressure of the deaerator (about 0.78 MPa), the input value of the speed limiting module is changed from large to small, and the speed limiting module slowly changes the output value into 0.17MPa from the real pressure of the deaerator according to the speed of 0.126MPa per minute;
step 11: the switching module 3 has two inputs, one is the output of the rate limiting module, the other is the normal operation pressure set value of 0.17MPa, and the output value of the pulse module 2 is selected where one of the two input signals is used as the output. The signal from pulse module 2 is 1 and then the switch module 3 selects the output value of the rate limiting module as output in the 601-900 s, forming the deaerator pressure regulation setpoint and transmitting to the pressure control logic.
The signal transmission shows that the deaerator pressure regulation set value under the working condition is the deaerator actual pressure at the moment before the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, and the control function of slowly transiting the deaerator pressure within 601-900 seconds to the normal pressure set value is completed.
Step 12: the deaerator pressure control maintaining and transition unit receives a deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit for 901 seconds, and the output of the pulse module 2 is changed from 1 to 0;
step 13: the switching module 3 has two inputs, one is the output of the rate limiting module, the other is the normal operation pressure set value of 0.17MPa, and the output value of the pulse module 2 is selected where one of the two input signals is used as the output. The signal from the pulse module 2 is 0, then the 901 th second switch module 3 selects the normal operating pressure set point of 0.17MPa as output, forms the deaerator pressure adjustment set point and communicates to the pressure control logic.
The steps 1 to 13 are the whole process of realizing the pressure maintenance of the deaerator in 600 seconds and the slow transition to the normal pressure in 300 seconds by the deaerator pressure control and transition unit when the deaerator pressure maintaining mode judging unit generates the deaerator pressure maintaining mode signal.
The invention keeps the front and back pressure control in an automatic state no matter the normal operation and transient state of the unit, and the principle is to perform conventional PID control according to the deviation of a set value and an actual measured value. The difference is that the set value is unchanged before the invention, and the pressure set value generated by the deaerator pressure control maintaining and transition unit is received after the invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. A transient pressure control method for a deaerator during large-amplitude load shedding of a nuclear power unit is characterized by comprising the following steps of: the method comprises the following steps of (1), judging the pressure maintaining mode of the deaerator; step (2), deaerator pressure control maintaining and transition control; step (3), pressure control;
in the step (1), a deaerator pressure maintaining mode judging unit is additionally arranged, logic judgment is carried out by utilizing an AND gate, an OR gate and an NOT gate, the condition that deaerator pressure maintaining is needed in is identified, a deaerator pressure maintaining mode signal is generated, the signal transmission time sequence problem of the deaerator pressure maintaining mode signal is solved, and the erroneous judgment of the pressure maintaining mode during other external logic tests is avoided;
in the deaerator pressure maintaining mode judging unit, a turbine shutdown signal (1) of the group A and a turbine shutdown signal (2) of the group A are adopted to judge the turbine shutdown by adopting a first AND gate logic; the turbine shutdown signal (1) of the group B and the turbine shutdown signal (2) of the group B adopt a second AND gate logic to judge the turbine shutdown; the shutdown signal (1) and the shutdown signal (2) adopt a third AND gate logic to judge whether to shutdown or not; the first AND gate, the second AND gate, the steam turbine island operation signal (1) and the steam turbine island operation signal (2) adopt OR gate logic; the third AND gate passes through NOT gate logic; after delaying for 1 second, the OR gate adopts a fourth AND gate to obtain a pressure maintaining mode signal of the deaerator;
The step (1) specifically comprises three working conditions, namely, a first working condition: when the steam turbine is not stopped, the reactor is not stopped, and the steam turbine suddenly changes from normal operation to island operation; working condition II: when the reactor is not shut down, the steam turbine suddenly rotates from normal operation to shutdown; and (3) working condition III: when the reactor is switched from normal operation to shutdown, the steam turbine is switched from normal operation to shutdown.
2. The transient pressure control method for the deaerator during large-amplitude load shedding of the nuclear power unit according to claim 1, wherein the transient pressure control method is characterized by comprising the following steps of: the working condition one comprises the following steps:
step (1): the deaerator pressure maintaining mode judging unit receives a steam turbine island operation signal (1) and a steam turbine island operation signal (2) from external logic, and the steam turbine island operation signal are inverted from 0 to 1 and sent to an OR gate input end;
step (2): because at least one of the input conditions of the OR gate is met, the output of the OR gate is 1, and the OR gate is sent to the input end of the delay module;
step (3): the output of the delay module is 1 after one second, and the output is sent to the input end of the fourth AND gate;
step (4): the shutdown signal (1) and the shutdown signal (2) are both 0 at the moment, the output 0 of the third AND gate is sent to the input end of the NOT gate, the output of the NOT gate is 1, and the output of the NOT gate is sent to the input end of the fourth AND gate;
Step (5): and if the two input conditions of the fourth AND gate are 1, the output of the fourth AND gate is 1, and a deaerator pressure maintaining mode signal is generated.
3. The transient pressure control method for the deaerator during large-amplitude load shedding of the nuclear power unit according to claim 1, wherein the transient pressure control method is characterized by comprising the following steps of: the second working condition comprises the following steps:
step (1): generating a turbine shutdown signal (1) of the group A and a turbine shutdown signal (2) of the group A, wherein the signals are inverted from 0 to 1, and then the output of the first AND gate is 1 and sent to the input end of the OR gate;
step (2): generating a B-group turbine shutdown signal (1) and a B-group turbine shutdown signal (2), wherein the B-group turbine shutdown signal and the B-group turbine shutdown signal are inverted from 0 to 1, and then the second AND gate outputs 1 and is sent to an OR gate input end;
step (3): because at least one of the input conditions of the OR gate is met, the output of the OR gate is 1, and the OR gate is sent to the input end of the delay module;
step (4): the output of the delay module is 1 after one second, and the output is sent to the input end of the fourth AND gate;
step (5): the shutdown signal (1) and the shutdown signal (2) are both 0 at the moment, the output 0 of the third AND gate is sent to the input end of the NOT gate, the output of the NOT gate is 1, and the output of the NOT gate is sent to the input end of the fourth AND gate;
step (6): and if the two input conditions of the fourth AND gate are 1, the output of the AND gate is 1, and a deaerator pressure maintaining mode signal is generated.
4. The transient pressure control method for the deaerator during large-amplitude load shedding of the nuclear power unit according to claim 1, wherein the transient pressure control method is characterized by comprising the following steps of: the third working condition comprises the following steps:
step (1): generating a shutdown signal (1) and a shutdown signal (2) which are inverted from 0 to 1, wherein the Siam AND gate output 1 is sent to the NOT gate input end, the NOT gate output is 0, and the NOT gate output is sent to the input end 1 of the fourth AND gate;
step (2): generating a turbine shutdown signal (1) of the group A and a turbine shutdown signal (2) of the group A, wherein the signals are inverted from 0 to 1, and then the output of the first AND gate is 1 and sent to the input end of the OR gate;
step (3): generating a B-group turbine shutdown signal (1) and a B-group turbine shutdown signal (2), wherein the B-group turbine shutdown signal and the B-group turbine shutdown signal are inverted from 0 to 1, and then the second AND gate outputs 1 and is sent to an OR gate input end;
step (4): because at least one of the input conditions of the OR gate is met, the output of the OR gate is 1, and the OR gate is sent to the input end of the delay module;
step (5): the output of the delay module is 1 after one second, and the output is sent to the input end 2 of the fourth AND gate; because of the effect of the time delay module, the input end of the fourth AND gate is inverted from 1 to 0 before transition, the condition that two input conditions are simultaneously met cannot occur, the output of the fourth AND gate is 0, and a deaerator pressure maintaining mode signal is not generated.
5. The transient pressure control method for the deaerator during large-amplitude load shedding of the nuclear power unit according to claim 1, wherein the transient pressure control method is characterized by comprising the following steps of: in the step (2), a deaerator pressure control maintaining and transition unit is additionally arranged, and when the steam turbine is suddenly changed from normal operation to shutdown or island operation by utilizing a switching module, a pulse module and a speed limit module, the steam pressure in the deaerator is maintained within 600 seconds, and then the steam turbine is slowly transited to a normal control value at a speed of 0.126 MPa/min; a final deaerator pressure regulation setpoint is generated that is used by the pressure control logic.
6. The transient pressure control method for the deaerator during large-amplitude load shedding of the nuclear power unit according to claim 5, wherein the transient pressure control method is characterized by comprising the following steps of: the deaerator pressure signal comes from the on-site measured value; the deaerator pressure maintaining mode signal is from a deaerator pressure maintaining mode judging unit, and the signal is used for controlling a 600 second pulse signal of the trigger pulse module (1) and a 900 second pulse signal of the pulse module; the 600 second pulse signal output by the pulse module (1) is used for controlling the switching selection of the switching module (1) and the switching module (2); the 900 second pulse signal output by the pulse module (2) is used for controlling the switching selection of the switching module (3); the switching module (1) is used for selecting the measured pressure of the deaerator and the measured pressure of the deaerator at the previous moment, and realizing the function of memorizing the measured pressure of the deaerator when receiving the 600 second pulse signal output by the pulse module (1); the switching module (2) is used for selecting the output value of the switching module (1) and the normal set value of 0.17MPa, and switching the set value from 0.17MPa to the output value of the switching module (1) when receiving the 600 second pulse signal output by the pulse module (1); the rate module is used for controlling the rate of change of the output value of the switching module (2); the switching module (3) is used for selecting the output value of the speed module and the normal set value of 0.17MPa, and switching the set value from 0.17MPa to the output value of the speed module when the 900 second pulse signal output by the pulse module (2) is received, so that the deaerator pressure regulation set value is finally generated.
7. The method for controlling the transient pressure of the deaerator during large-amplitude load shedding of the nuclear power unit according to claim 6, wherein the method comprises the following steps: the step (2) specifically comprises two working conditions, namely, a first working condition: the unit normally operates, and a deaerator pressure maintaining mode signal is not triggered; working condition II: assuming that the unit normally operates under 100% load, an abnormal condition happens suddenly, so that the deaerator pressure maintaining mode judging unit generates a deaerator pressure maintaining mode signal.
8. The method for controlling the transient pressure of the deaerator during large-amplitude load shedding of the nuclear power unit according to claim 7, wherein the method comprises the following steps: the working condition one comprises the following steps:
step (1): the deaerator pressure control maintaining and transition unit does not receive the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the first pulse module cannot trigger 600 seconds of pulse, the output is 0, and the signal is transmitted to the first switching module and the second switching module;
step (2): the deaerator pressure control maintaining and transition unit does not receive the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the second pulse module cannot trigger 900 second pulse, the output is 0, and the output is transmitted to the third switching module;
Step (3): the first switching module is provided with two paths of input signals, one path is the actual pressure of the deaerator, the other path is the output value of the first switching module, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 0, and the first switching module selects the actual deaerator pressure as output and transmits the actual deaerator pressure to the second switching module;
step (4): the second switching module has two paths of input signals, one path is the output of the first switching module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 0, and the second switching module selects the normal operation pressure set value of 0.17MPa as output and transmits the output to the rate limiting module;
step (5): the rate limiting module receives the output value of 0.17MPa from the second switching module, and the output value of the rate limiting module is also 0.17MPa when no change occurs;
step (6): the third switching module is provided with two paths of input signals, one path is the output of the rate limiting module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the second pulse module; and if the signal from the second pulse module is 0, the third switching module selects the normal operation pressure set value of 0.17MPa as output, forms a deaerator pressure regulation set value and transmits the deaerator pressure regulation set value to the pressure control logic.
9. The method for controlling the transient pressure of the deaerator during large-amplitude load shedding of the nuclear power unit according to claim 7, wherein the method comprises the following steps: the second working condition comprises the following steps:
step (1): the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the first pulse module triggers 600 second pulse, the output is 1, and the signal is transmitted to the first switching module and the second switching module;
step (2): the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal from the deaerator pressure maintaining mode judging unit, the second pulse module triggers 900 second pulse, the output is 1, and the signal is transmitted to the third switching module;
step (3): the first switching module is provided with two paths of input signals, one path is the actual pressure of the deaerator, the other path is the output value of the first switching module, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 1, the first switching module selects the output value of the switching module as output within 600 seconds and transmits the output value to the second switching module;
step (4): the second switching module has two paths of input signals, one path is the output of the first switching module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 0, the second switching module selects the output value of the first switching module as output within 600 seconds and transmits the output value to the rate limiting module;
Step (5): the speed limiting module receives an output value from the second switching module, the input value of the speed limiting module is changed from 0.17MPa to the real pressure of the deaerator at the previous moment, the input value of the speed limiting module is changed from small to large, and the speed limiting module changes the output value from 0.17MPa to the real pressure of the deaerator at the previous moment according to the speed of 9999MPa per minute;
step (6): the third switching module is provided with two paths of input signals, one path is the output of the rate limiting module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the second pulse module; the signal from the second pulse module is 1, and the third switching module selects the output value of the speed limiting module as output within 900 seconds to form a deaerator pressure regulation set value and transmits the deaerator pressure regulation set value to the pressure control logic;
step (7): the deaerator pressure control maintaining and transition unit receives the deaerator pressure maintaining mode signal 601-900 seconds from the deaerator pressure maintaining mode judging unit, and the output of the first pulse module is changed from 1 to 0;
step (8): the first switching module is provided with two paths of input signals, one path is the actual pressure of the deaerator, the other path is the output value of the first switching module, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 0, and the first switching module selects the actual deaerator pressure as output and transmits the actual deaerator pressure to the second switching module;
Step (9): the second switching module has two paths of input signals, one path is the output of the first switching module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the first pulse module; the signal from the first pulse module is 0, the second switching module selects the output value of the first switching module as output within 600 seconds and transmits the output value to the rate limiting module;
step (10): the speed limiting module receives an output value from the second switching module, the input value of the speed limiting module is changed from the real pressure of the deaerator to 0.17MPa, the input value of the speed limiting module is changed from large to small, and the speed limiting module slowly changes the output value from the real pressure of the deaerator to 0.17MPa according to the speed of 0.126MPa per minute;
step (11): the third switching module is provided with two paths of input signals, one path is the output of the rate limiting module, the other path is the normal operation pressure set value of 0.17MPa, and one path of input signals is selected to be used as the output value of the second pulse module; and if the signal from the second pulse module is 1, the third switching module selects the output value of the speed limiting module as output within 601-900 seconds to form a deaerator pressure regulation set value and transmit the deaerator pressure regulation set value to the pressure control logic.
10. The method for controlling the transient pressure of the deaerator during large-amplitude load shedding of the nuclear power unit according to claim 8, which is characterized by comprising the following steps: in the step (3), the principle is to perform conventional PID control according to the deviation between the set value and the actual measured value.
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