CN116466570A - Simulation method for high-temperature gas cooled reactor steam temperature control system - Google Patents
Simulation method for high-temperature gas cooled reactor steam temperature control system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 106
- 238000004088 simulation Methods 0.000 title claims abstract description 55
- 239000001307 helium Substances 0.000 claims abstract description 266
- 229910052734 helium Inorganic materials 0.000 claims abstract description 266
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 266
- 230000009471 action Effects 0.000 claims abstract description 104
- 230000004044 response Effects 0.000 claims abstract description 70
- 230000008569 process Effects 0.000 claims abstract description 50
- 239000007789 gas Substances 0.000 claims abstract description 35
- 230000010354 integration Effects 0.000 claims description 53
- 230000010355 oscillation Effects 0.000 claims description 10
- 238000012937 correction Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 description 13
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- 238000004458 analytical method Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 4
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P.I., P.I.D.
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The embodiment of the disclosure provides a simulation method for a high-temperature gas cooled reactor steam temperature control system, which indirectly realizes the debugging of an evaporator outlet steam temperature controller by performing proportional action and integral action on a helium flow controller, obtains a target proportional gain and a target integral time constant according to each closed loop response curve of each process state variable of the steam temperature control system, and realizes the accurate control of the evaporator outlet steam temperature during actual operation through the target proportional gain and the target integral time constant. The simulation method of the embodiment of the disclosure verifies the rationality and reliability of the debugging method of the steam temperature control system of the high-temperature gas cooled reactor demonstration project, and the debugging method and the operation characteristic of the device holding the key system are realized, so that frequent disturbance to a unit during actual application of the project is avoided, the debugging task of the high-temperature reactor demonstration project is completed, and the safe and reliable operation of the high-temperature reactor demonstration project is ensured.
Description
Technical Field
The embodiment of the disclosure belongs to the technical field of automatic control of high-temperature gas cooled reactors, and particularly relates to a simulation method for a steam temperature control system of a high-temperature gas cooled reactor.
Background
Because the high-temperature gas cooled reactor demonstration project is a multi-input multi-output complex large system, a close coupling relation exists between each control quantity and the regulated quantity, the control strategy to the execution mechanism are all applied to the project practice for the first time, the debugging work of the steam temperature control system is a novel challenge, the steam temperature control system is applied for the first time to the domestic nuclear power station, the rationality and the reliability of the debugging method of the high-temperature gas cooled reactor demonstration project steam temperature control system are verified, the debugging method and the operation characteristics of key system equipment are mastered, and the frequent introduction of disturbance in the project debugging process is avoided, so that the method is a serious problem in the prior art.
In view of the above, it is necessary to provide a simulation method for a steam temperature control system of a high-temperature gas cooled reactor, which is reasonable in design and effectively solves the above problems.
Disclosure of Invention
The embodiment of the disclosure aims to at least solve one of the technical problems existing in the prior art, and provides a simulation method for a steam temperature control system of a high-temperature gas cooled reactor.
The embodiment of the disclosure provides a simulation method for a steam temperature control system of a high-temperature gas cooled reactor, which comprises the following steps:
performing a proportional action on a helium flow controller and applying a negative/positive step disturbance signal of a first helium mass flow set point to the helium flow controller;
obtaining a closed loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action according to the negative/positive step disturbance signal of the first helium mass flow set value;
selecting a target proportional gain according to each closed-loop response curve of the steam temperature control system under the proportional action;
performing proportional action and integral action on the helium flow controller, and applying a negative/positive step disturbance signal of a second helium mass flow set value to the helium flow controller, wherein the proportional gain of the helium flow controller is the target proportional gain;
obtaining a closed loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action and the integral action according to the negative/positive step disturbance signal of the helium mass flow set value;
and selecting a target integration time constant according to each closed-loop response curve of the steam temperature control system under the proportional action and the integral action.
Optionally, the obtaining a closed loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action according to the negative/positive step disturbance signal of the first helium mass flow set value includes:
and adjusting the proportional gain of the helium flow controller according to the negative/positive step disturbance signal of the first helium mass flow set value to obtain a closed-loop response curve corresponding to each process state variable of the steam temperature control system from the initial state to the steady state under the proportional action under different proportional gains, so as to obtain a closed-loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action.
Optionally, the adjusting the proportional gain of the helium flow controller includes:
firstly, setting the proportional gain of the helium flow controller to be smaller and gradually increasing to be larger; wherein, the liquid crystal display device comprises a liquid crystal display device,
the adjusting range of the proportional gain of the helium flow controller is 0.5-5.
Optionally, the selecting a target proportional gain according to each closed-loop response curve of the steam temperature control system under the proportional action includes:
and selecting the target proportional gain from different proportional gains according to at least one of the oscillation size, the short settling time and the deviation size of each closed-loop response curve under the proportional action.
Optionally, the applying a negative/positive step disturbance signal to the helium flow controller at a first helium mass flow set point includes:
and applying a negative/positive step disturbance signal with the amplitude range of 0.5kg/s to 1.5kg/s of helium mass flow set value to the helium flow controller.
Optionally, the obtaining a closed loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action and the integral action according to the negative/positive step disturbance of the second helium mass flow set value includes:
and adjusting the integration time constant of the helium flow controller according to the negative/positive step disturbance signal of the second helium mass flow set value to obtain closed-loop response curves corresponding to all process state variables of the steam temperature control system from the initial state to the steady state under different integration time constants so as to obtain closed-loop response curves corresponding to all process state variables of the steam temperature control system under the proportional action and the integral action.
Optionally, said adjusting an integration time constant of said helium flow controller includes:
setting the integration time constant to a larger value, and gradually reducing the integration time constant; wherein the adjustment range of the integration time constant is 0.5-0.01.
Optionally, the selecting a target integration time constant according to each closed-loop response curve of the steam temperature control system under proportional action and integral action includes:
the target integration time constant is selected from among different integration time constants according to at least one of the oscillation magnitude, the settling time length and the deviation magnitude of each of the closed loop response curves under proportional action and integral action.
Optionally, the process state variable includes at least one of a helium blower speed set point and its correction, a primary helium blower speed, a loop helium mass flow, a nuclear power, a reactor outlet hot helium temperature, an evaporator outlet vapor temperature, and an output hot power seed.
Optionally, the applying a negative/positive step disturbance signal of a second helium mass flow set point to the helium flow controller includes:
and applying a negative/positive step disturbance signal with the amplitude range of 0.5kg/s to 1.5kg/s of helium mass flow set value to the helium flow controller.
According to the simulation method for the high-temperature gas cooled reactor steam temperature control system, the helium flow controller is subjected to proportional action firstly through the simulation method, then proportional action and integral action are carried out, the debugging process of the evaporator outlet steam temperature controller is indirectly achieved, the target proportional gain and the target integral time constant are obtained according to the closed loop response curve corresponding to each process state variable of the steam temperature control system, and the accurate control of the evaporator outlet steam temperature is achieved in actual operation through the target proportional gain and the target integral time constant. The simulation method of the embodiment of the disclosure verifies the rationality and reliability of the debugging method of the steam temperature control system of the high-temperature gas cooled reactor demonstration project, and the debugging method and the operation characteristic of the device holding the key system are realized, so that frequent disturbance to a unit during actual application of the project is avoided, the debugging task of the high-temperature reactor demonstration project is completed, and the safe and reliable operation of the high-temperature reactor demonstration project is ensured.
Drawings
FIG. 1 is a schematic diagram of a flow chart of a steam temperature controller of a steam temperature control system of a high temperature gas cooled reactor according to one embodiment of the disclosure;
FIG. 2 is a flow chart of a simulation method for a steam temperature control system of a high temperature gas cooled reactor according to another embodiment of the disclosure;
FIG. 3 is a simulation plot of helium mass flow under the effect of a closed-loop test proportion of a steam temperature control system for a simulation method of a steam temperature control system of a high temperature gas cooled reactor in another embodiment of the disclosure;
FIG. 4 is a graph of a simulation of nuclear power with a closed loop test scale of a steam temperature control system for a simulation method of a steam temperature control system of a high temperature gas cooled reactor in accordance with another embodiment of the present disclosure;
FIG. 5 is a simulation plot of reactor outlet hot helium temperature for a closed loop test scale of a steam temperature control system for a simulation method for a high temperature gas cooled reactor steam temperature control system in accordance with another embodiment of the present disclosure;
FIG. 6 is a simulation plot of evaporator outlet steam temperature for a closed loop test scale of a steam temperature control system for a simulation method for a high temperature gas cooled reactor steam temperature control system in accordance with another embodiment of the present disclosure;
FIG. 7 is a simulation graph of output thermal power of a steam temperature control system for a simulation method of a steam temperature control system of a high temperature gas cooled reactor according to another embodiment of the disclosure;
FIG. 8 is a graph of a simulation of helium mass flow under the action of a closed loop test of a proportional and integral action of a vapor temperature control system for a simulation method of a vapor temperature control system of a high temperature gas cooled reactor in accordance with another embodiment of the present disclosure;
FIG. 9 is a graph of a simulation of nuclear power under the proportional and integral action of a closed loop test of a steam temperature control system for a simulation method of a steam temperature control system of a high temperature gas cooled reactor in accordance with another embodiment of the present disclosure;
FIG. 10 is a simulation plot of reactor outlet hot helium temperature under the effect of closed loop test proportionality and integration of a steam temperature control system for a simulation method of a high temperature gas cooled reactor steam temperature control system in accordance with another embodiment of the present disclosure;
FIG. 11 is a simulation plot of evaporator outlet steam temperature for a closed loop test proportional action and integral action of a steam temperature control system for a simulation method for a high temperature gas cooled reactor steam temperature control system in accordance with another embodiment of the present disclosure;
FIG. 12 is a simulation plot of output thermal power from a closed loop test proportional action and integral action of a steam temperature control system for a simulation method of a high temperature gas cooled reactor steam temperature control system in accordance with another embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of a simulation apparatus for a steam temperature control system of a high-temperature gas cooled reactor according to another embodiment of the disclosure.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are described in further detail below with reference to the accompanying drawings and detailed description.
The working principle of the automatic control of the evaporator outlet steam temperature controller, i.e. the working procedure of the evaporator outlet steam temperature controller, is illustrated schematically in fig. 1. Specifically, the evaporator outlet steam temperature control system and the helium flow control system form a cascade control loop of the steam generator, the evaporator outlet steam temperature control system is used as a main loop of the cascade control loop, and the helium flow control system is used as a secondary loop of the cascade control loop. And the helium flow control system corrects a helium fan rotating speed feedforward signal given by a helium flow-rotating speed meter through a preset helium flow controller according to the deviation of the helium mass flow measured value and the given value and the integration of the deviation, so that the helium mass flow control is realized. The evaporator outlet steam temperature control system compares the measured value of the evaporator outlet steam temperature with a given value, generates correction quantity of the given value of the helium mass flow of the helium flow control system through a preset steam temperature controller according to deviation signals and integration of the measured value and the given value, and dynamically adjusts the evaporator outlet steam temperature by adjusting the helium flow.
As shown in fig. 2, an aspect of the embodiments of the present disclosure provides a simulation method S100 for a steam temperature control system of a high temperature gas cooled reactor, the method S100 including:
s110, performing proportional action on the helium flow controller, and applying a negative/positive step disturbance signal of a first helium mass flow set value to the helium flow controller.
Specifically, the helium flow controller is placed in an automatically adjusted state, and the integration is turned off by setting the integration time constant KI to infinity, so that the helium flow controller performs only proportional action.
After the proportional action on the helium flow controller, a negative/positive step disturbance signal of a first helium mass flow set point is applied to the helium flow controller. Wherein, the negative step disturbance signal of the helium mass flow set point can cause the rotation speed of the helium blower to be reduced, and the positive step disturbance signal of the helium mass flow set point can cause the rotation speed of the helium blower to be increased. Specifically, a negative/positive-step disturbance signal of a helium mass flow set value in a magnitude range of 0.5kg/s to 1.5kg/s is applied to the helium flow controller.
Preferably, a positive/negative step disturbance signal of a helium mass flow set point of 1.0kg/s in amplitude is applied to the helium flow controller, that is, a positive/negative step disturbance signal of a helium mass flow set point of 1.0kg/s or-1.0 kg/s is applied to the helium flow controller. Specifically, in this example, a negative/positive step disturbance signal was applied to a helium mass flow set point of-1.0 kg/s for a proportional helium flow controller.
S120, according to the negative/positive step disturbance signal of the first helium mass flow set value, a closed loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action is obtained.
Specifically, in this embodiment, according to a negative/positive step disturbance signal applied to a helium mass flow set value with an amplitude of 1.0kg/s to a helium flow controller, the proportional gain of the helium flow controller is adjusted to obtain a closed-loop response curve corresponding to each process state variable of the steam temperature control system from initial state to steady state under the proportional action under different proportional gains, so as to obtain a closed-loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action.
In this embodiment, the process state variables of the steam temperature control system include at least one of a helium mass flow set point and a correction value thereof, a feed pump rotation speed and a set point thereof, a feed water flow measurement value, an output thermal power calculation value, an evaporator outlet steam temperature, a reactor outlet hot helium temperature, and a nuclear power. The process state variables of the steam temperature control system may be selected according to actual needs, and the present embodiment is not particularly limited.
Illustratively, said adjusting the proportional gain of said helium flow controller comprises:
the proportional gain of the helium flow controller is set to a small value and gradually increased to a large value. Wherein, the adjusting range of the proportional gain of the helium flow controller is 0.5-5. In this embodiment, the proportional gains P of the helium flow controllers are set to p=0.5, p=2.5, and p=5, respectively.
Further specifically, according to a negative/positive step disturbance signal applied to the helium flow controller, the proportional gain of the helium flow controller is adjusted to obtain a closed-loop response curve corresponding to at least one of the helium mass flow set point and its correction value, the feed pump rotation speed and its set point, the feed water flow measurement value, the output thermal power calculation value, the evaporator outlet steam temperature, the reactor outlet hot helium temperature and the nuclear power from initial to steady state under the proportional action when the proportional gain P is p=0.5, p=2.5 and p=5, respectively, so as to obtain a closed-loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action.
S130, selecting a target proportional gain according to each closed-loop response curve of the steam temperature control system under the proportional action.
And selecting a target proportional gain from different proportional gains according to at least one of the oscillation size, the short stability time and the deviation size of each closed-loop response curve under the proportional action. More specifically, when comparing and analyzing the closed loop response curves under the proportional action at different proportional gains, a response curve with small oscillation, short settling time and small deviation is selected. That is, a proportional gain is selected that minimizes both the amount of overshoot and settling time, and minimizes the offset. That is, an optimal proportional gain is selected.
In this step, the closed loop response curves of the process state variables under the proportional action under the different proportional gains are compared and analyzed, and the response curves can be compared and analyzed by using an eye observation or parameter comparison method, so that the response curve with the best performance is found according to the comparison and analysis result, and the proportional gain corresponding to the response curve is used as the target proportional gain.
It should be further noted that in the comparison and analysis process, the comparison and analysis may be performed based on a single response curve of a process state variable, or may be performed in combination with response curves of a plurality of process state variables.
In this embodiment, a negative/positive step disturbance signal of 1kg/s helium mass flow set value is applied, the integral time constant is 0, the proportional gain is p=0.5, p=2.5 and p=5, the helium mass flow, the nuclear power, the reactor outlet hot helium temperature, the evaporator outlet steam temperature and the output hot power simulation result are sequentially intercepted, and comprehensive data analysis is appropriate when p=5, that is, the target proportional gain p=5. The oscillation is small, the settling time is short, and the deviation is small when p=5.
Through the target proportional gain, indirect accurate control of the steam temperature can be realized when the helium flow controller actually operates, and frequent disturbance of a unit is avoided when the engineering is actually applied.
S140, performing proportional action and integral action on the helium flow controller, and applying a negative/positive step disturbance signal of a second helium mass flow set value to the helium flow controller, wherein the proportional gain of the helium flow controller is the target proportional gain.
Specifically, the target gain is used as a proportional gain for proportional action of the helium flow controller, and then the integration time constant KI is set to be a larger value, so that the proportional action and the integration action of the helium flow controller are realized. And then applying a negative/positive step disturbance signal with a second helium mass flow set value in the amplitude range of 0.5kg/s to 1.5kg/s to the helium flow controller for the proportional action and the integral action.
Preferably, in this embodiment, the proportional and integral helium flow controllers are subjected to a negative/positive step disturbance signal having a helium mass flow setpoint of 1.0 kg/s. That is, a negative/positive step disturbance signal of a helium mass flow set point of 1.0kg/s or-1.0 kg/s can be applied to the proportional and integral helium flow controllers. In this example, a negative/positive step disturbance signal was applied to a helium mass flow set point of-1.0 kg/s for a proportional and integral helium flow controller.
S150, obtaining a closed loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action and the integral action according to the negative/positive step disturbance signal of the second helium mass flow set value.
Specifically, according to a negative/positive step disturbance signal applied to a helium mass flow set value with the amplitude of 1.0kg/s on a helium flow controller, adjusting an integration time constant of the helium flow controller to obtain closed-loop response curves corresponding to all process state variables of a steam temperature control system from the initial state to the steady state under different integration time constants, so as to obtain closed-loop response curves corresponding to all process state variables of the steam temperature control system under the proportional action and the integral action.
In this embodiment, the process state variables of the vapor temperature control system include at least one of helium mass flow set point and its correction, feedwater pump speed and its set point, feedwater flow measurements, output thermal power calculations, evaporator outlet vapor temperature, reactor outlet hot helium temperature, and nuclear power. The process state variables of the steam temperature control system may be selected according to actual needs, and the present embodiment is not particularly limited.
Illustratively, adjusting the integration time constant of the helium flow controller includes:
the integration time constant KI is set to a larger value and gradually decreases. Wherein the adjustment range of the integration time constant KI is 0.5-0.01.
Wherein the adjustment range of the integration time constant KI is 0.5-0.01. In this embodiment, the integration time constant KI is set to ki=0.5, ki=0.1, and ki=0.01 in this order. The integration time constant is set to be a larger value, and gradually reduced, so that the time for the measured value to converge to the set value can be shortened, and oscillation and even instability caused by too short integration time can be avoided.
Further specifically, a negative/positive step disturbance signal of a helium mass flow set value with the amplitude of 1.0kg/s is applied to the helium flow controller, and an integration time constant KI of the helium flow controller is adjusted to obtain a closed-loop response curve corresponding to at least one of a helium mass flow set value, a corrected value thereof, a feed pump rotating speed, a set value thereof, a feed water flow measurement value, an output thermal power calculation value, an evaporator outlet steam temperature, a reactor outlet thermal helium temperature and a nuclear power in the steam temperature control system under the proportional action and the integral action when the integration time constant KI is KI=0.5, KI=0.1 and KI=0.01 respectively, so as to obtain a closed-loop response curve corresponding to each process state variable of the steam temperature control system from the initial state to the steady state.
S160, selecting a target integration time constant according to each closed-loop response curve of the steam temperature control system under the proportional action and the integral action.
Specifically, the target integration time constant is selected among the respective different integration time constants KI according to at least one of the oscillation magnitude, the short settling time, and the deviation magnitude of the respective closed-loop response curves under the proportional action and the integral action. More specifically, when comparing and analyzing each closed loop response curve under proportional action and integral action at different integral time constants, a response curve with small oscillation, short settling time, and small deviation is selected. That is, a proportional gain is selected that minimizes both the amount of overshoot and settling time, and minimizes the offset. That is, an optimal integration time constant KI is selected.
In this step, the closed loop response curves of the process state variables under the proportional action and the integral action under the condition that the different integrals are time constants are compared and analyzed, and the response curves can be compared and analyzed by using a method of human eye observation or parameter comparison, so that the response curve with the best performance is found according to the comparison and analysis result, and the integration time constant corresponding to the response curve is taken as a target integration time constant KI.
It should be further noted that in the comparison and analysis process, the comparison and analysis may be performed based on a single response curve of a process state variable, or may be performed in combination with response curves of a plurality of process state variables.
In this embodiment, a negative/positive step disturbance signal of-1 kg/s helium mass flow set value is applied, the target proportional gain is p=5, the integration time constant KI is ki=0.5, ki=0.1 and ki=0.01, the helium mass flow, the nuclear power, the reactor outlet hot helium temperature, the evaporator outlet steam temperature and the output hot power simulation result are sequentially intercepted, and comprehensive data analysis is performed, so that the proportional gain p=5 and the integration time constant ki=0.5 are suitable. That is, by performing simulation debugging on the steam temperature control system of the high-temperature gas cooled reactor, the target gain is 5, and the target integration time constant is 0.5. Thus, when the engineering actually operates, the steam temperature can be accurately adjusted according to the target gain and the target time constant.
Through the target integral time constant, indirect accurate control on the steam temperature can be realized when the helium flow controller actually operates, and frequent disturbance of a unit is avoided when the engineering is actually applied.
In this embodiment, fig. 3 to 7 are simulation graphs of a steam outlet temperature control system of a simulation method for a steam temperature control system of a high temperature gas cooled reactor under the proportional action, and in fig. 3 to 7, the setting of parameters includes:
taking the 100% rfp power level test as an example, the steam temperature control system closed loop test:
the disturbance is to apply a step signal of a helium mass flow set value of-1 kg/s;
the integration time constant KI is 0, and the proportional gains P are p=0.5, p=2.5, and p=5, respectively;
and sequentially intercepting helium mass flow, nuclear power, reactor outlet hot helium temperature, evaporator outlet steam temperature and outputting a thermal power simulation result. Fig. 3-7 are closed-loop dynamic response curves of the process state variable from initial to steady state at different proportional gains, respectively.
As shown in FIG. 3, a step signal of-1 kg/s helium mass flow set point is applied, the set point is lower than the measured value, the helium flow controller sends out a command for reducing the frequency of the main helium fan, so that the helium flow is reduced, the hot helium entering the evaporator is reduced due to the reduction of the helium flow, the vapor temperature at the outlet of the evaporator is reduced, the vapor temperature set point at the outlet of the evaporator is kept unchanged, positive deviation is generated between the two signals, the vapor temperature controller at the outlet of the evaporator sends out a command for increasing the helium flow set point, and as can be seen from the curve, the larger the proportion parameter, the more obvious the helium flow increasing command, and the smaller the corresponding amplitude of the decrease of the helium flow along with the step disturbance. The helium flow is the most stable of the three proportion parameters, namely the proportion maximum parameter.
As shown in FIG. 4, a step signal of-1 kg/s helium mass flow set point is applied, the set point is lower than the measured value, the helium flow controller sends out a command for reducing the frequency of the main helium fan, so that the helium flow is reduced, the hot helium entering the evaporator is reduced due to the reduction of the helium flow, the steam temperature at the outlet of the evaporator is reduced, the steam temperature set point at the outlet of the evaporator is kept unchanged, positive deviation is generated between the two signals, the steam temperature controller at the outlet of the evaporator sends out a command for increasing the helium flow set point, the larger parameter is, the more obvious the command for increasing the helium flow is, the smaller the corresponding amplitude of the helium flow along with the step disturbance is, the fluctuation of the helium flow is small, and the nuclear power is stable. From the curve, it can be seen that the larger the ratio parameter, the smaller the magnitude of the helium flow drop, and the smaller the nuclear power drop. Under the three proportion parameters, the proportion is larger, and the nuclear power is the most stable.
As shown in FIG. 5, a step signal of-1 kg/s helium mass flow set point is applied, the set point is lower than the measured value, the helium flow controller sends out a command for reducing the frequency of the main helium fan, so that the helium flow is reduced, the hot helium entering the evaporator is reduced due to the reduction of the helium flow, the vapor temperature at the outlet of the evaporator is reduced, the vapor temperature set point at the outlet of the evaporator is kept unchanged, positive deviation is generated between the two signals, the vapor temperature controller at the outlet of the evaporator sends out a command for increasing the helium flow set point, the larger the proportion is, the more obvious the command for increasing the helium flow is, the smaller the corresponding amplitude of the helium flow which is reduced along with the step disturbance is, and the higher the hot helium temperature is under the same nuclear power. As can be seen from the curve, the ratio of the parameters is larger, and the change amplitude of the helium flow is small, so that the change amplitude of the hot helium temperature is also small, and the whole system is stable.
As shown in FIG. 6, a step signal of-1 kg/s helium mass flow set point is applied, the set point is lower than the measured value, the helium flow controller sends out a command for reducing the frequency of the main helium fan, so that the helium flow is reduced, the hot helium entering the evaporator is reduced due to the reduction of the helium flow, the vapor temperature at the outlet of the evaporator is reduced, the set point of the vapor temperature at the outlet of the evaporator is kept unchanged, positive deviation is generated between the two signals, the vapor temperature controller sends out a command for increasing the set point of the helium flow, the proportion is a larger parameter, the vapor temperature at the outlet of the evaporator is also reduced to the minimum because the reduction amplitude of the helium flow is minimum, and the vapor temperature at the outlet of the evaporator is the most stable under the three proportion parameters.
As shown in FIG. 7, a step signal of-1 kg/s helium mass flow set point is applied, the set point is lower than the measured value, the helium flow controller sends out a command for reducing the frequency of the main helium fan, so that the helium flow is reduced, the hot helium entering the evaporator is reduced due to the reduction of the helium flow, the steam temperature at the outlet of the evaporator is reduced, the steam temperature set point at the outlet of the evaporator is kept unchanged, positive deviation is generated between the two signals, the steam temperature controller at the outlet of the evaporator sends out a command for increasing the helium flow set point, the larger parameter is, the more obvious the command for increasing the helium flow is, the smaller the corresponding amplitude of the helium flow along with the step disturbance is, the fluctuation of the helium flow is small, and the nuclear power is stable. As can be seen from the curve, the nuclear power does not change greatly, so the output thermal power does not change greatly, and the whole curve is stable.
In summary, the disturbance is to apply a step signal of a helium mass flow set point of-1 kg/s; the integral effect is 0, and the proportional effect is p=0.5 respectively; p=2.5; p=5, and the mass flow rate of helium, the nuclear power, the reactor outlet hot helium temperature, the evaporator outlet steam temperature and the output hot power are simulated in sequence, so that comprehensive data analysis is more suitable when p=5. That is, p=0.1 is the target proportional gain.
It should be noted that, the simulation verification in the present embodiment is only illustrative, that is, the selection and analysis of experimental parameters are both illustrative, and the simulation verification is not limited to the above method.
In this embodiment, fig. 8 to 12 are simulation graphs of a steam temperature control system of a simulation method for a steam temperature control system of a high temperature gas cooled reactor under proportional action and integral action, and in fig. 8 to 12, the setting of parameters includes:
taking the 100% rfp power level test as an example, the 1# nsss module steam temperature control system closed loop test:
the disturbance is to apply a step signal of a helium mass flow set value of-1 kg/s;
proportional gain p=5, integration time constant ki=0.5, ki=0.1, respectively; ki=0.01;
and sequentially intercepting helium mass flow, nuclear power, reactor outlet hot helium temperature, evaporator outlet steam temperature and outputting a thermal power simulation result. Fig. 8-12 are closed-loop dynamic response curves for the process state variable from initial to steady state, respectively, at different integration time constants.
As shown in FIG. 8, a step signal of-1 kg/s helium mass flow set point is applied, the set point is lower than the measured value, the helium flow controller sends out a command for reducing the frequency of the main helium fan, so that the helium flow is reduced, the hot helium entering the evaporator is reduced due to the reduction of the helium flow, the vapor temperature at the outlet of the evaporator is reduced, the vapor temperature set point at the outlet of the evaporator is kept unchanged, positive deviation is generated between the two signals, the vapor temperature controller at the outlet of the evaporator sends out a command for increasing the helium flow set point, and as can be seen from a curve, after the integral function is added, the integral function is stronger, and the whole system is more stable.
As shown in FIG. 9, a step signal of-1 kg/s helium mass flow set point is applied, the set point is lower than the measured value, the helium flow controller sends out a command for reducing the frequency of the main helium fan, so that the helium flow is reduced, the hot helium entering the evaporator is reduced due to the reduction of the helium flow, the steam temperature at the outlet of the evaporator is reduced, the steam temperature set point at the outlet of the evaporator is kept unchanged, positive deviation is generated between the two signals, the steam temperature controller at the outlet of the evaporator sends out a command for increasing the helium flow set point, the larger parameter is, the more obvious the command for increasing the helium flow is, the smaller the corresponding amplitude of the helium flow along with the step disturbance is, the fluctuation of the helium flow is small, and the nuclear power is stable. From the curve, it can be seen that the stronger the integral action, the more stable the system overall.
As shown in FIG. 10, a step signal of-1 kg/s helium mass flow set point is applied, the set point is lower than the measured value, the helium flow controller sends out a command for reducing the frequency of the main helium fan, so that the helium flow is reduced, the hot helium entering the evaporator is reduced due to the reduction of the helium flow, the vapor temperature at the outlet of the evaporator is reduced, the vapor temperature set point at the outlet of the evaporator is kept unchanged, positive deviation is generated between the two signals, the vapor temperature controller at the outlet of the evaporator sends out a command for increasing the helium flow set point, the larger the proportion is, the more obvious the command for increasing the helium flow is, the smaller the corresponding amplitude of the helium flow which is reduced along with the step disturbance is, and the higher the hot helium temperature is under the same nuclear power. From the curve, it can be seen that the stronger the integral action, the more stable the system overall.
As shown in FIG. 11, a step signal of-1 kg/s helium mass flow set point is applied, the set point is lower than the measured value, the helium flow controller sends out a command for reducing the frequency of the main helium fan, so that the helium flow is reduced, the hot helium entering the evaporator is reduced due to the reduction of the helium flow, the vapor temperature at the outlet of the evaporator is reduced, the vapor temperature set point at the outlet of the evaporator is kept unchanged, positive deviation is generated between the two signals, the vapor temperature controller at the outlet of the evaporator sends out a command for increasing the set point of the helium flow, and the vapor temperature at the outlet of the evaporator is changed due to the fluctuation of the helium flow. From the curve, it can be seen that the stronger the integral action, the more stable the system overall.
As shown in FIG. 12, a step signal of-1 kg/s helium mass flow set point is applied, the set point is lower than the measured value, the helium flow controller sends out a command for reducing the frequency of the main helium fan, so that the helium flow is reduced, the hot helium entering the evaporator is reduced due to the reduction of the helium flow, the steam temperature at the outlet of the evaporator is reduced, the steam temperature set point at the outlet of the evaporator is kept unchanged, positive deviation is generated between the two signals, the steam temperature controller at the outlet of the evaporator sends out a command for increasing the helium flow set point, the larger parameter is, the more obvious the command for increasing the helium flow is, the smaller the corresponding amplitude of the helium flow along with the step disturbance is, the fluctuation of the helium flow is small, and the nuclear power is stable. As can be seen from the curve, the nuclear power does not change greatly, so the output thermal power does not change greatly, and the whole curve is stable.
In summary, the disturbance is to apply a step disturbance signal of a helium mass flow set value of-1 kg/s; the proportional gain was p=5, the integral time constants were ki=0.5, ki=0.1, and ki=0.01, respectively, and helium mass flow, nuclear power, reactor outlet hot helium temperature, evaporator outlet vapor temperature, and output hot power were simulated in that order. The analysis of the data is integrated, and the proportional gain p=5 and the integration time constant ki=0.5 are suitable. That is, the target proportional gain is 5 and the target integration time constant is 0.5.
It should be noted that, the simulation verification in the present embodiment is only illustrative, that is, the selection and analysis of experimental parameters are both illustrative, and the simulation verification is not limited to the above method.
According to the simulation method for the high-temperature gas cooled reactor steam temperature control system, the helium flow controller is subjected to proportional action firstly through the simulation method, then proportional action and integral action are carried out, the debugging process of the evaporator outlet steam temperature controller is indirectly achieved, the target proportional gain and the target integral time constant are obtained according to the closed loop response curve corresponding to each process state variable of the steam temperature control system, and the accurate control of the evaporator outlet steam temperature is achieved in actual operation through the target proportional gain and the target integral time constant. The simulation method of the embodiment of the disclosure verifies the rationality and reliability of the debugging method of the steam temperature control system of the high-temperature gas cooled reactor demonstration project, and the debugging method and the operation characteristic of the device holding the key system are realized, so that frequent disturbance to a unit during actual application of the project is avoided, the debugging task of the high-temperature reactor demonstration project is completed, and the safe and reliable operation of the high-temperature reactor demonstration project is ensured.
As shown in fig. 13, another aspect of the embodiments of the present disclosure provides a simulation apparatus 100 for a steam temperature control system of a high temperature gas cooled reactor, the apparatus 100 comprising:
a first setting module 110 for scaling the helium flow controller and applying a negative/positive step disturbance to the helium flow controller for a first helium mass flow set point.
The first response curve obtaining module 120 is configured to obtain a closed-loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action according to the negative/positive step disturbance of the first helium mass flow set value.
A first selection module 130 is configured to select a target proportional gain according to each of the closed loop response curves of the steam temperature control system under the proportional action.
And a second setting module 140, configured to perform a proportional action and an integral action on the helium flow controller, and apply a negative/positive step disturbance to the helium flow controller with a second helium mass flow set value, where a proportional gain of the helium flow controller is the target proportional gain.
And the second response curve obtaining module 150 is configured to obtain a closed-loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action and the integral action according to the negative/positive step disturbance of the helium mass flow set value.
A second selection module 160 for selecting a target integration time constant based on each of the closed loop response curves of the vapor temperature control system under proportional and integral effects.
According to the simulation device for the steam temperature control system of the high-temperature gas cooled reactor, the simulation device is used for performing proportional action on the helium flow controller, then performing proportional action and integral action, indirectly realizing the debugging process of the steam temperature controller at the outlet of the evaporator, obtaining the target proportional gain and the target integral time constant according to the closed loop response curve corresponding to each process state variable of the steam temperature control system, and realizing the accurate control of the steam temperature at the outlet of the evaporator in actual operation. The simulation device of the embodiment of the disclosure verifies the rationality and reliability of a debugging method of a steam temperature control system of a high-temperature gas cooled reactor demonstration project, and the debugging method and the operation characteristic of the device of a holding key system are realized, so that frequent disturbance for a unit during actual application of the project is avoided, the debugging task of the high-temperature reactor demonstration project is completed, and the safe and reliable operation of the high-temperature reactor demonstration project is ensured.
It is to be understood that the above implementations are merely exemplary implementations employed to illustrate the principles of the disclosed embodiments, which are not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the embodiments of the disclosure, and these modifications and improvements are also considered to be within the scope of the embodiments of the disclosure.
Claims (10)
1. A simulation method for a high temperature gas cooled reactor steam temperature control system, the method comprising:
performing a proportional action on a helium flow controller and applying a negative/positive step disturbance signal of a first helium mass flow set point to the helium flow controller;
obtaining a closed loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action according to the negative/positive step disturbance signal of the first helium mass flow set value;
selecting a target proportional gain according to each closed-loop response curve of the steam temperature control system under the proportional action;
performing proportional action and integral action on the helium flow controller, and applying negative/positive step disturbance of a second helium mass flow set value to the helium flow controller, wherein the proportional gain of the helium flow controller is the target proportional gain;
obtaining a closed loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action and the integral action according to the negative/positive step disturbance of the helium mass flow set value;
and selecting a target integration time constant according to each closed-loop response curve of the steam temperature control system under the proportional action and the integral action.
2. The method of claim 1, wherein said deriving a closed loop response curve for each process state variable of said vapor temperature control system in proportion to said negative/positive step disturbance signal of said first helium mass flow setpoint comprises:
and adjusting the proportional gain of the helium flow controller according to the negative/positive step disturbance signal of the first helium mass flow set value to obtain a closed-loop response curve corresponding to each process state variable of the steam temperature control system from the initial state to the steady state under the proportional action under different proportional gains, so as to obtain a closed-loop response curve corresponding to each process state variable of the steam temperature control system under the proportional action.
3. The method of claim 2, wherein said adjusting the proportional gain of said helium flow controller comprises:
firstly, setting the proportional gain of the helium flow controller to be smaller and gradually increasing to be larger; wherein, the liquid crystal display device comprises a liquid crystal display device,
the adjusting range of the proportional gain of the helium flow controller is 0.5-5.
4. The method of claim 2, wherein said selecting a target proportional gain based on each of said closed loop response curves of said steam temperature control system under proportional action comprises:
and selecting the target proportional gain from different proportional gains according to at least one of the oscillation size, the short settling time and the deviation size of each closed-loop response curve under the proportional action.
5. A method according to any one of claims 1 to 3, wherein said applying a negative/positive step disturbance signal to said helium flow controller at a first helium mass flow set point comprises:
and applying a negative/positive step disturbance signal with the amplitude range of 0.5kg/s to 1.5kg/s of helium mass flow set value to the helium flow controller.
6. A method according to any one of claims 1 to 3, wherein said deriving a closed loop response curve for each process state variable of said vapor temperature control system under proportional and integral effects based on said negative/positive step disturbance signal of said second helium mass flow setpoint comprises:
and adjusting the integration time constant of the helium flow controller according to the negative/positive step disturbance signal of the second helium mass flow set value to obtain closed-loop response curves corresponding to all process state variables of the steam temperature control system from the initial state to the steady state under different integration time constants so as to obtain closed-loop response curves corresponding to all process state variables of the steam temperature control system under the proportional action and the integral action.
7. The method of claim 6, wherein said adjusting an integration time constant of said helium flow controller comprises:
setting the integration time constant to a larger value, and gradually reducing the integration time constant; wherein the adjustment range of the integration time constant is 0.5-0.01.
8. The method of claim 6, wherein said selecting a target integration time constant based on each of said closed loop response curves of said vapor temperature control system under proportional action and integral action comprises:
the target integration time constant is selected from among different integration time constants according to at least one of the oscillation magnitude, the settling time length and the deviation magnitude of each of the closed loop response curves under proportional action and integral action.
9. A method according to any one of claims 1 to 3 wherein the process state variables include at least one of helium blower speed set point and its correction, primary helium blower speed, primary circuit helium mass flow, nuclear power, reactor outlet hot helium temperature, evaporator outlet vapor temperature and output hot power.
10. A method according to any one of claims 1 to 3, wherein said applying a negative/positive step disturbance signal to said helium flow controller at a second helium mass flow set point comprises:
and applying a negative/positive step disturbance signal with the amplitude range of 0.5kg/s to 1.5kg/s of helium mass flow set value to the helium flow controller.
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