CN115441472B - Nuclear power unit primary frequency modulation system switching control method and system - Google Patents
Nuclear power unit primary frequency modulation system switching control method and system Download PDFInfo
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- CN115441472B CN115441472B CN202211075857.0A CN202211075857A CN115441472B CN 115441472 B CN115441472 B CN 115441472B CN 202211075857 A CN202211075857 A CN 202211075857A CN 115441472 B CN115441472 B CN 115441472B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention discloses a method and a system for controlling the switching of a primary frequency modulation system of a nuclear power unit, wherein the method comprises the following steps: s1, acquiring equipment state information of a unit under the condition that a primary frequency modulation system of the unit is in a commissioning state; the equipment state information includes at least one of main equipment state information, core state information, control rod state information, and turbine state information; s2, judging whether the unit has the capability of operating the primary frequency modulation system according to the equipment state information, if so, returning to S1, otherwise, generating a primary frequency modulation exit signal; by implementing the invention, the primary frequency modulation system can be automatically withdrawn from the system in time when the primary frequency modulation system does not have the capability of operating, the risk of human error is reduced, the probability of unexpected fault events such as machine jump, pile jump and the like of the nuclear power unit is effectively reduced, and the running stability and reliability of the unit are enhanced.
Description
Technical Field
The invention relates to the technical field of primary frequency modulation, in particular to a method and a system for controlling switching of a primary frequency modulation system of a nuclear power unit.
Background
The primary frequency modulation system belongs to an important component of the normal operation of the nuclear power unit, and due to the randomness of the amplitude and the triggering frequency of the primary frequency modulation system and the uncertainty of the state of the transient initial reactor, the primary frequency modulation system can deviate the main parameters of the reactor from the steady-state operation point when the primary frequency modulation system participates in unsuitable conditions, so that the safety margin of the unit is reduced, and the long-term safe operation of the unit is threatened.
In the related art, the commissioning and the exiting of the primary frequency modulation system in some nuclear power units still depend on manual control of operators, which greatly increases the burden of operators and brings about the risk of human errors. When a certain unit has occurred, the operator misoperation of the primary frequency modulation dead zone switching control causes the fluctuation of unit parameters and the occurrence of operation transient faults. In addition, the manual primary frequency modulation system is withdrawn from the system to put forward higher requirements on technical capability and operation experience of operators, and if the operators respond untimely, the failure to withdraw from the primary frequency modulation system in time can cause the conditions that the unit exceeds the operation technical specification, the machine jumps to jump, even the accident coping capability is lost and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method and a system for controlling the switching of a primary frequency modulation system of a nuclear power unit aiming at least one defect existing in the prior art.
The technical scheme adopted for solving the technical problems is as follows: a method for controlling the switching of a primary frequency modulation system of a nuclear power unit is constructed, which comprises the following steps:
S1, acquiring equipment state information of a unit under the condition that a primary frequency modulation system of the unit is in a put-into-operation state; the equipment state information comprises at least one of main equipment state information, reactor core state information, control rod state information and turbine state information;
S2, judging whether the unit has the capability of operating the primary frequency modulation system according to the equipment state information, if so, returning to the S1, and if not, generating a primary frequency modulation exit signal.
Preferably, in the step S1, the main device status information includes at least one of a unit regulator pressure, a unit regulator water level, a steam generator water level, and a two-circuit operation status.
Preferably, in the step S2, determining whether the unit has a capability of operating a primary frequency modulation system according to the device state information includes:
When the pressure of the unit voltage stabilizer exceeds a first set range, the water level of the unit voltage stabilizer exceeds a second set range, the water level of the steam generator exceeds a third set range or the working state of the two loops is in an abnormal working condition, judging that the unit does not have the capability of operating the primary frequency modulation system; the abnormal working condition comprises at least one of load shedding of the steam-water separation reheater system, load shedding of the electric main water feed pump system and faults of a unit rotating speed measuring channel.
Preferably, in the S1, the core status information includes at least one of reactor coolant temperature data, fuel cladding status data, and fuel core status data; wherein the reactor coolant temperature data comprises a number of coolant average temperatures used to characterize coolant temperatures in different loops; the fuel cladding state data comprises a plurality of first detection data used for representing the temperature of the fuel cladding; the fuel pellet status data includes a number of second sensed data indicative of a temperature of the fuel pellet.
Preferably, in the step S2, determining whether the unit has a capability of operating a primary frequency modulation system according to the device state information includes:
And when the difference between the minimum value of any coolant average temperature and the first reference value after correction is smaller than a first set threshold value, the maximum value of any coolant average temperature is larger than a second set threshold value, the difference between any coolant average temperature and the first reference value is smaller than a third set threshold value, the difference between any coolant average temperature and the first reference value is larger than a fourth set threshold value, the difference between any first detection data and the first set protection value is larger than a first safety margin or the difference between any second detection data and the second set protection value is larger than a second safety margin, judging that the unit does not have the capability of operating the primary frequency modulation system.
Preferably, in the step S1, the control bar state information includes at least one of a bar set real-time travel, a bar set limit command, and a bar set operation mode.
Preferably, in the step S2, determining whether the unit has a capability of operating a primary frequency modulation system according to the device state information includes:
And judging that the unit does not have the capability of operating the primary frequency modulation system when the real-time travel of the rod group is positioned at the upper limit of the set adjusting belt, the real-time travel of the rod group is positioned at the highest travel position, the real-time travel of the rod group is deviated from the set travel, the real-time travel of the rod group is positioned at the low travel limit position, the rod group limit instruction is a manual and automatic rod lifting prohibition mode or the rod group working mode is a non-automatic working mode.
Preferably, in the step S1, the turbine status information includes at least one of a turbine operation mode, a turbine valve status, a turbine transient status, and a turbine output frequency.
Preferably, in the step S2, determining whether the unit has a capability of operating a primary frequency modulation system according to the device state information includes:
And when the operation mode of the steam turbine is a load open-loop mode, the valve state of the steam turbine is in a valve regulating limit state, the instantaneous state of the steam turbine is in an instantaneous disturbance state or the difference between the output frequency of the steam turbine and the frequency of a power grid is larger than a fifth set threshold value, judging that the unit does not have the capability of operating the primary frequency modulation system.
Preferably, the primary frequency modulation system switching control method of the nuclear power unit further comprises the following steps:
and S3, controlling the primary frequency modulation system to exit after the primary frequency modulation exit signal is acquired.
Preferably, the primary frequency modulation system switching control method of the nuclear power unit further comprises the following steps:
And S4, judging whether all conditions for generating the primary frequency modulation exit signal are invalid when a commissioning instruction is acquired, if so, commissioning the primary frequency modulation system, and otherwise, prohibiting commissioning the primary frequency modulation system.
The invention also constructs a primary frequency modulation system switching control system of the nuclear power unit, which comprises:
The information acquisition unit is used for acquiring equipment state information of the unit according to the acquisition instruction when the primary frequency modulation system of the unit is in a put-into-operation state; the equipment state information comprises at least one of main equipment state information, reactor core state information, control rod state information and turbine state information;
And the signal generation unit is used for judging whether the unit has the capability of the operation primary frequency modulation system according to the equipment state information, generating the acquisition instruction when judging that the unit has the capability of the operation primary frequency modulation system, and generating a primary frequency modulation exit signal when judging that the unit does not have the capability of the operation primary frequency modulation system.
Preferably, the primary frequency modulation system switching control system of the nuclear power unit further comprises:
and the exit control unit is used for controlling the primary frequency modulation system to exit after receiving the primary frequency modulation exit signal.
Preferably, the primary frequency modulation system switching control system of the nuclear power unit further comprises:
And the commissioning control unit is used for commissioning the primary frequency modulation system if all the conditions for generating the primary frequency modulation exit signal are invalid when a commissioning instruction is acquired, and prohibiting commissioning of the primary frequency modulation system if at least one condition for generating the primary frequency modulation exit signal is not invalid.
The invention has at least the following beneficial effects: the method for controlling the switching of the primary frequency modulation system of the nuclear power unit comprises the following steps: the method comprises the steps of acquiring equipment state information of a unit under the condition that a primary frequency modulation system of the unit is in operation, generating a primary frequency modulation exit signal after determining that the unit does not have the capability of operating the primary frequency modulation system based on the equipment state information, further enabling the primary frequency modulation system to exit timely and automatically, reducing human error risks, and comprehensively, accurately and effectively triggering the condition of the primary frequency modulation exit signal, thereby reducing the probability of unexpected fault events such as machine tripping, pile tripping and the like of the nuclear power unit, and effectively enhancing the running stability and reliability of the unit.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flowchart I of a primary frequency modulation system switching control method of a nuclear power unit provided by the invention;
FIG. 2 is a logic diagram of the generation of a primary frequency modulated exit signal provided by the present invention;
FIG. 3 is a second flowchart of a primary frequency modulation system switching control method of a nuclear power unit provided by the invention;
Fig. 4 is a schematic structural diagram of a primary frequency modulation system switching control system of a nuclear power unit.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
Referring to fig. 1, the invention constructs a primary frequency modulation system switching control method of a nuclear power unit, which comprises a step S1 and a step S2.
The step S1 comprises the following steps: acquiring equipment state information of a unit under the condition that a primary frequency modulation system of the unit is in a running state; the plant status information includes at least one of main plant status information, core status information, control rod status information, and turbine status information.
The step S2 comprises the following steps: and judging whether the unit has the capability of operating the primary frequency modulation system according to the equipment state information, if so, returning to S1, and if not, generating a primary frequency modulation exit signal.
In some embodiments, the master status information in step S1 includes at least one of a group regulator pressure, a group regulator water level, a steam generator water level, and a two-circuit operating status.
Further, in some embodiments, referring to fig. 2, in step S2, determining whether the unit has a capability of commissioning a primary frequency modulation system according to the device status information includes: when the pressure of the unit voltage stabilizer exceeds a first set range, the water level of the unit voltage stabilizer exceeds a second set range, the water level of the steam generator exceeds a third set range or the working state of the two loops is in an abnormal working condition, judging that the unit does not have the capability of operating the primary frequency modulation system; the abnormal working condition comprises at least one of load shedding of the steam-water separation reheater system, load shedding of the electric main feed water pump system and faults of a unit rotating speed measuring channel.
Specifically, when the main equipment of the unit is in an unstable operation state, the important parameters participating in primary frequency modulation may be caused to fluctuate, and the fluctuation may reduce the reliability of the primary frequency modulation, so that the primary frequency modulation function should be exited at this time. Taking the pressure of the unit voltage stabilizer as an example, when the pressure of the unit voltage stabilizer is larger than the upper limit value of the first setting range or smaller than the lower limit value of the first setting range, the unit voltage stabilizer is indicated to be unstable in operation of the unit due to failure, external interference or special working condition and the like, if primary frequency modulation is performed at the moment, the stability and the accuracy of the primary frequency modulation are affected due to light weight, and fault events such as machine jump and pile jump are caused due to heavy weight, so that the primary frequency modulation system should be forbidden to operate at the moment. Similarly, when the water level of the unit voltage stabilizer and the water level of the steam generator exceed the set range and the working state of the two loops is in an abnormal working condition, the unit can be also indicated to be in an unstable working state.
In some embodiments, the core status information in step S1 includes at least one of reactor coolant temperature data, fuel cladding status data, and fuel core status data; wherein the reactor coolant temperature data comprises a number of coolant average temperatures used to characterize coolant temperatures in different loops; the fuel cladding status data includes a plurality of first sensed data indicative of fuel cladding temperature; the fuel pellet status data includes a number of second sensed data indicative of the temperature of the fuel pellet.
Further, in some embodiments, referring to fig. 2, determining whether the unit has a capability to operate the primary frequency modulation system according to the device status information in step S2 includes: and when the difference between the minimum value of any coolant average temperature after correction and the first reference value is smaller than a first set threshold value, the maximum value of any coolant average temperature is larger than a second set threshold value, the difference between any coolant average temperature and the first reference value is smaller than a third set threshold value, the difference between any coolant average temperature and the first reference value is larger than a fourth set threshold value, the difference between any first detection data and the first set protection value is larger than a first safety margin or the difference between any second detection data and the second set protection value is larger than a second safety margin, determining that the unit does not have the capability of operating the primary frequency modulation system. The first set threshold, the third set threshold and the fourth set threshold may be 2 ℃, and the second set threshold may be 310.83 ℃.
In some embodiments, the correction process for the minimum of the average coolant temperatures is: the minimum of the coolant average temperatures is added to the correction temperature.
Specifically, in a nuclear power plant, the reactor includes 3 loops, each of which is cooled by coolant; when the load of the steam turbine is increased too fast, the average temperature of the coolant is low, a shutdown signal can occur, and if the average temperature of the coolant is reduced continuously, the risks of neutron fluence rate distortion and the excessively low average temperature of the coolant can occur; conversely, when the load of the turbine is reduced too rapidly, the average temperature of the coolant is high, and there is a risk that the neutron fluence rate is distorted and the average temperature of the coolant is too high; therefore, in order to ensure that the primary frequency modulation can be performed stably and reliably, when the average temperature of the coolant of any loop is too high or too low and the average temperature of the coolant is too far from the set temperature value, the unit should exit the primary frequency modulation;
If any of the first detection data is too high (corresponding to the situation that the difference between the first detection data and the first set protection value is larger than the first safety margin), the reactor may deviate from nucleate boiling, so that the fuel cladding is burnt; however, if any of the second detection data is too high (corresponding to the case that the difference between the second detection data and the second set protection value is greater than the second safety margin), the pellets may be melted to cause the cladding to be damaged. And when primary frequency modulation is performed, the average temperature, neutron fluence rate and loop pressure change of the reactor may be caused, the changes of the parameters are closely related to the first detection data and the second detection data, if the first detection data or the second detection data are too high, the fuel cladding or the fuel core block may be burnt out finally, so that in order to avoid the situations, the unit should exit from primary frequency modulation when any one of the first detection data or the second detection data is too high.
In a preferred embodiment, the first sensed data comprises fuel cladding temperature values acquired at a plurality of temperature measurement points and the second sensed data comprises fuel pellet temperature values acquired at a plurality of temperature measurement points.
Further, in some embodiments, the first detection data and the second detection data may also be temperature difference values of the input and output ports of each loop, so as to represent the states of the fuel cladding and the fuel pellet by the temperature difference values of the input and output ports of each loop, and it is understood that the first detection data and the second detection data are the same data, and although in this embodiment, the first detection data and the second detection data cannot directly represent the temperatures of the fuel cladding and the fuel pellet, the implementation means of this sampling manner is relatively simple. In addition, the first set protection value, the second set protection value, the first safety margin and the second safety margin may be set according to engineering requirements.
In some embodiments, the control bar status information in step S1 includes at least one of a bar set real-time travel, a bar set limit command, and a bar set mode of operation.
Further, in some embodiments, referring to fig. 2, determining whether the unit has a capability of commissioning a primary frequency modulation system according to the device status information in step S2 includes: when the real-time travel of the rod group is positioned at the upper limit of the set adjusting belt, the real-time travel of the rod group is positioned at the highest travel position, the real-time travel of the rod group has deviation from the set travel, the real-time travel of the rod group is positioned at the low travel limit position, the rod group limit instruction is a manual and automatic rod lifting prohibition mode or the rod group working mode is a non-automatic working mode, and the machine set is judged to have no capability of operating the primary frequency modulation system.
In particular, the bar sets may include R bar sets and G bar sets; when the lifting or inserting of the R rod group and the G rod group is limited, if primary frequency modulation is performed at the moment, neutron fluence rate distortion is likely to be caused, and the unit should exit the primary frequency modulation at the moment, so that the load change of the steam turbine is stopped. When the real-time travel of the bar set is at the upper limit of the set adjustment band, the bar set is in principle not allowed to overrun (the condition that the adjustment exceeds the set adjustment band), and primary frequency modulation should be exited; similarly, when the real-time travel of the rod group is positioned at the highest travel position, the rod group is not provided with the allowance for continuously lifting the rods, and the primary frequency modulation is required to be withdrawn; the deviation exists between the real-time travel and the set travel of the rod group, which indicates that the rod group or a rod group control system may have faults and the primary frequency modulation should be exited; when the real-time travel of the bar set is at the set low travel limit position, the adjustment of the bar set is limited, and the bar set should be withdrawn from the primary frequency modulation in order to avoid unexpected faults caused by control conflict with the primary frequency modulation; when the rod group limiting instruction is to prohibit manual and automatic rod lifting, the rod group is prohibited to operate, and the primary frequency modulation is limited at the moment and the primary frequency modulation should be exited; when the rod group working mode is a non-automatic working mode, the control of the primary frequency modulation on the rod group is limited, and the primary frequency modulation should be exited.
In some embodiments, the turbine state information in step S1 includes at least one of a turbine operating mode, a turbine valve state, a turbine transient state, and a turbine output frequency.
Further, in some embodiments, referring to fig. 2, determining whether the unit has a capability of commissioning a primary frequency modulation system according to the device status information in step S2 includes: and when the operation mode of the steam turbine is a load open-loop mode, the valve state of the steam turbine is in a valve regulating limit state, the instantaneous state of the steam turbine is in an instantaneous disturbance state or the difference between the output frequency of the steam turbine and the frequency of a power grid is greater than a fifth set threshold value, judging that the unit does not have the capability of operating the primary frequency regulating system.
Specifically, the load open-loop mode is mainly used for ensuring that the unit operates stably, and primary frequency modulation can cause unnecessary disturbance, so that the primary frequency modulation should be exited when the operation mode of the steam turbine is in the load open-loop mode; when the valve state of the steam turbine is in the valve regulating limiting state, the capacity of the steam turbine for regulating active power is limited, and primary frequency modulation should be exited; when the transient state of the steam turbine is in the transient disturbance state, such as the load shedding phenomenon of the steam turbine, in order to avoid the main parameter fluctuation participating in primary frequency modulation and influence the reliability of the primary frequency modulation, when the difference between the output frequency of the primary frequency modulation steam turbine and the power grid frequency is larger than a fifth set threshold value, the primary frequency modulation is corrected to have exceeded the regulation capacity limit of the steam turbine, so that the primary frequency modulation is withdrawn, wherein the fifth set threshold value can be combined with the unequal rotation speed rate and the regulation capacity of the reactor, and optionally, the fifth set threshold value can be 0.2Hz.
It can be understood that in this embodiment, as long as any condition shown in fig. 2 is satisfied, a primary frequency modulation exit signal is generated, so that the conditions can be arbitrarily combined with each other, and in consideration of different operation parameters, system configuration, and the like of different nuclear power units, the exit adjustment, monitoring parameters, and design limit selection can be adjusted according to actual requirements of unit operation.
In some embodiments, as shown in fig. 3, the method for controlling the primary frequency modulation system switching of the nuclear power unit further includes: step S3: and after the primary frequency modulation exit signal is obtained, controlling the primary frequency modulation system to exit.
In order to ensure that the primary frequency modulation system can stably operate, when the primary frequency modulation system is put back into service, all failure faults should be removed, and the unit has the capability of putting into service the primary frequency modulation system, in some embodiments, as shown in fig. 3, the method for controlling the switching of the primary frequency modulation system of the nuclear power unit further comprises: step S4: when a commissioning instruction is acquired, judging whether all conditions for generating the primary frequency modulation exit signal are invalid, if so, commissioning the primary frequency modulation system, otherwise, prohibiting commissioning the primary frequency modulation system. Wherein, the staff can input the operation instruction to the system.
Referring to fig. 4, the invention further constructs a primary frequency modulation system switching control system of the nuclear power unit, which comprises an information acquisition unit 1 and a signal generation unit 2.
The information acquisition unit 1 is used for acquiring equipment state information of the unit according to an acquisition instruction when the primary frequency modulation system of the unit is in a put-into-operation state; the plant status information includes at least one of main plant status information, core status information, control rod status information, and turbine status information.
The signal generating unit 2 is configured to determine whether the unit has a capability of operating the primary frequency modulation system according to the device state information, generate an acquisition instruction when it is determined that the unit has the capability of operating the primary frequency modulation system, and generate a primary frequency modulation exit signal when it is determined that the unit does not have the capability of operating the primary frequency modulation system.
In some embodiments, as shown in fig. 4, the primary frequency modulation system switching control system of the nuclear power unit further comprises a switching control unit 3. The exit control unit 3 is used for controlling the primary frequency modulation system to exit after receiving the primary frequency modulation exit signal.
In some embodiments, as shown in fig. 4, the primary frequency modulation system switching control system of the nuclear power unit further comprises a switching control unit 4. And the commissioning control unit 4 is used for commissioning the primary frequency modulation system if all the conditions for generating the primary frequency modulation exit signal are invalid when the commissioning instruction is acquired, and forbidding the commissioning of the primary frequency modulation system if at least one condition for generating the primary frequency modulation exit signal is not invalid.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
It can be understood that by implementing the invention, whether the unit has the capability of operating the primary frequency modulation system can be judged according to the equipment state information, when the unit is judged not to have the capability of operating the primary frequency modulation system, a primary frequency modulation exit signal is generated, so that the primary frequency modulation system automatically exits in time, the risk of human error is reduced, the condition of triggering the primary frequency modulation exit signal is comprehensive and accurate, the probability of unexpected fault events such as machine jump, pile jump and the like of the nuclear power unit is effectively reduced, and the running stability and reliability of the unit are enhanced.
It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (14)
1. The switching control method of the primary frequency modulation system of the nuclear power unit is characterized by comprising the following steps of:
S1, acquiring equipment state information of a unit under the condition that a primary frequency modulation system of the unit is in a put-into-operation state; the equipment state information comprises at least one of main equipment state information, reactor core state information, control rod state information and turbine state information; the core status information includes fuel cladding status data and fuel core status data; wherein the fuel cladding status data comprises a plurality of first detection data for representing the temperature of the fuel cladding; the fuel pellet state data comprises a plurality of second detection data used for representing the temperature of the fuel pellet; the first detection data and the second detection data are temperature difference values of input and output ports of each loop;
s2, judging whether the unit has the capability of operating the primary frequency modulation system according to the equipment state information, if so, returning to the S1, otherwise, generating a primary frequency modulation exit signal;
In the step S2, determining whether the unit has a capability of commissioning a primary frequency modulation system according to the device state information includes: and when the difference value between any one of the first detection data and the first set protection value is larger than a first safety margin or the difference value between any one of the second detection data and the second set protection value is larger than a second safety margin, judging that the unit does not have the capability of operating the primary frequency modulation system.
2. The primary frequency modulation system switching control method of a nuclear power unit according to claim 1, wherein in S1, the main equipment status information includes at least one of a unit voltage stabilizer pressure, a unit voltage stabilizer water level, a steam generator water level and a two-loop working state.
3. The method for controlling switching of a primary frequency modulation system of a nuclear power unit according to claim 2, wherein in S2, determining whether the unit has a capability of switching the primary frequency modulation system according to the equipment status information includes:
When the pressure of the unit voltage stabilizer exceeds a first set range, the water level of the unit voltage stabilizer exceeds a second set range, the water level of the steam generator exceeds a third set range or the working state of the two loops is in an abnormal working condition, judging that the unit does not have the capability of operating the primary frequency modulation system; the abnormal working condition comprises at least one of load shedding of the steam-water separation reheater system, load shedding of the electric main water feed pump system and faults of a unit rotating speed measuring channel.
4. The nuclear power unit primary frequency modulation system switching control method of claim 1, wherein in S1, the core status information further includes reactor coolant temperature data, fuel cladding status data, and fuel core status data; wherein the reactor coolant temperature data comprises a number of coolant average temperatures used to characterize coolant temperatures in different loops.
5. The method for controlling switching of a primary frequency modulation system of a nuclear power unit according to claim 4, wherein in S2, determining whether the unit has a capability of switching the primary frequency modulation system according to the equipment status information, further comprises:
And when the difference between the minimum value of any coolant average temperature after correction and the first reference value is smaller than a first set threshold value, the maximum value of any coolant average temperature is larger than a second set threshold value, the difference between any coolant average temperature and the first reference value is smaller than a third set threshold value or the difference between any coolant average temperature and the first reference value is larger than a fourth set threshold value, judging that the unit does not have the capability of operating the primary frequency modulation system.
6. The primary frequency modulation system switching control method of a nuclear power unit according to claim 1, wherein in S1, the control bar status information includes at least one of a bar set real-time travel, a bar set limit instruction, and a bar set operation mode.
7. The method for controlling switching of a primary frequency modulation system of a nuclear power unit according to claim 6, wherein in S2, determining whether the unit has a capability of switching the primary frequency modulation system according to the equipment status information includes:
And judging that the unit does not have the capability of operating the primary frequency modulation system when the real-time travel of the rod group is positioned at the upper limit of the set adjusting belt, the real-time travel of the rod group is positioned at the highest travel position, the real-time travel of the rod group is deviated from the set travel, the real-time travel of the rod group is positioned at the low travel limit position, the rod group limit instruction is a manual and automatic rod lifting prohibition mode or the rod group working mode is a non-automatic working mode.
8. The method for controlling switching of a primary frequency modulation system of a nuclear power plant according to claim 1, wherein in S1, the turbine status information includes at least one of a turbine operation mode, a turbine valve status, a turbine transient status, and a turbine output frequency.
9. The method for controlling switching of a primary frequency modulation system of a nuclear power unit according to claim 8, wherein in S2, determining whether the unit has a capability of switching the primary frequency modulation system according to the equipment status information includes:
And when the operation mode of the steam turbine is a load open-loop mode, the valve state of the steam turbine is in a valve regulating limit state, the instantaneous state of the steam turbine is in an instantaneous disturbance state or the difference between the output frequency of the steam turbine and the frequency of a power grid is larger than a fifth set threshold value, judging that the unit does not have the capability of operating the primary frequency modulation system.
10. The primary frequency modulation system switching control method of a nuclear power unit according to any one of claims 1 to 9, further comprising:
and S3, controlling the primary frequency modulation system to exit after the primary frequency modulation exit signal is acquired.
11. The primary frequency modulation system switching control method of a nuclear power unit according to claim 10, further comprising:
And S4, judging whether all conditions for generating the primary frequency modulation exit signal are invalid when a commissioning instruction is acquired, if so, commissioning the primary frequency modulation system, and otherwise, prohibiting commissioning the primary frequency modulation system.
12. The utility model provides a nuclear power unit primary frequency modulation system throws and moves back control system which characterized in that includes:
the information acquisition unit is used for acquiring equipment state information of the unit according to the acquisition instruction when the primary frequency modulation system of the unit is in a put-into-operation state; the equipment state information comprises at least one of main equipment state information, reactor core state information, control rod state information and turbine state information; the core status information includes fuel cladding status data and fuel core status data; wherein the fuel cladding status data comprises a plurality of first detection data for representing the temperature of the fuel cladding; the fuel pellet state data comprises a plurality of second detection data used for representing the temperature of the fuel pellet; the first detection data and the second detection data are temperature difference values of input and output ports of each loop;
the signal generating unit is used for judging whether the unit has the capability of the operation primary frequency modulation system according to the equipment state information, generating the acquisition instruction when judging that the unit has the capability of the operation primary frequency modulation system, and generating a primary frequency modulation exit signal when judging that the unit does not have the capability of the operation primary frequency modulation system; judging whether the unit has the capability of operating the primary frequency modulation system according to the equipment state information, comprising the following steps: and when the difference value between any one of the first detection data and the first set protection value is larger than a first safety margin or the difference value between any one of the second detection data and the second set protection value is larger than a second safety margin, judging that the unit does not have the capability of operating the primary frequency modulation system.
13. The primary frequency modulation system switching control system of a nuclear power unit as set forth in claim 12, further comprising:
and the exit control unit is used for controlling the primary frequency modulation system to exit after receiving the primary frequency modulation exit signal.
14. The primary frequency modulation system switching control system of a nuclear power unit as set forth in claim 13, further comprising:
And the commissioning control unit is used for commissioning the primary frequency modulation system if all the conditions for generating the primary frequency modulation exit signal are invalid when a commissioning instruction is acquired, and prohibiting commissioning of the primary frequency modulation system if at least one condition for generating the primary frequency modulation exit signal is not invalid.
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