CN117404284A

CN117404284A - Reactor coolant system and control method and system of main coolant pump of reactor coolant system

Info

Publication number: CN117404284A
Application number: CN202311458405.5A
Authority: CN
Inventors: 刘天泽; 田青旺; 鄢跃勇; 李侦; 王裕峰
Original assignee: State Nuclear Power Automation System Engineering Co Ltd
Current assignee: State Nuclear Power Automation System Engineering Co Ltd
Priority date: 2023-11-03
Filing date: 2023-11-03
Publication date: 2024-01-16

Abstract

The present disclosure provides a reactor coolant system and a control method, system of a main coolant pump thereof, the control method comprising: presetting a main coolant pump in the reactor coolant system, and corresponding preset protection conditions and preset protection control rules under each set control mode; wherein the different set control modes comprise at least one of a start mode, an operation mode, a speed gear mode, a power supply mode and a shutdown mode corresponding to the main coolant pump; and acquiring an actual mode of the main coolant pump, and controlling the main coolant pump by adopting the preset protection control rule corresponding to the preset protection condition matched with the actual mode. In the method, the efficiency and the precision of the protection control of the main coolant pump in the reactor coolant system are effectively improved, and the safety, the stability and the reliability of the overall operation of the reactor coolant system are ensured.

Description

Reactor coolant system and control method and system of main coolant pump of reactor coolant system

Technical Field

The disclosure relates to the technical field of industrial control, in particular to a reactor coolant system and a control method and a system of a main coolant pump thereof.

Background

For a reactor coolant system in a million kw-level passive pressurized water reactor nuclear power plant, the reactor coolant is driven by a large capacity main coolant pump (or simply a main pump). When the main coolant pump is started in a cold state, the variable frequency speed regulation control device is adopted for variable frequency starting, so that the main coolant pump is gradually accelerated under control, the motor power in the cold state starting working condition is effectively reduced, the motor size is reduced to the greatest extent, and the method is suitable for the design of a compact reactor coolant system. Meanwhile, due to the special process conditions of the one-loop coolant system, four main coolant pumps must receive the up-down rotation speed command at the same time under a specific rotation speed platform, and the main coolant pumps are not allowed to run under different rotation speed platforms. The protection control of the main coolant pump is mainly realized in a manual mode; however, the manual operation of the main coolant pump only by the operator greatly increases the workload of the operator, and there is a risk of equipment damage or even accidents due to improper operation of the operator.

Disclosure of Invention

The technical problem to be solved by the present disclosure is to overcome the above-mentioned drawbacks in the prior art, and to provide a reactor coolant system and a control method, system, device and medium for a main coolant pump thereof.

The technical problems are solved by the following technical scheme:

the present disclosure provides a control method of a main coolant pump in a reactor coolant system, characterized in that the control method comprises:

presetting a main coolant pump in the reactor coolant system, and corresponding preset protection conditions and preset protection control rules under each set control mode;

wherein the different set control modes comprise at least one of a start mode, an operation mode, a speed gear mode, a power supply mode and a shutdown mode corresponding to the main coolant pump;

and acquiring an actual mode of the main coolant pump, and controlling the main coolant pump by adopting the preset protection control rule corresponding to the preset protection condition matched with the actual mode.

Preferably, the start mode includes a non-forced start mode and a forced start mode;

the step of obtaining the actual mode of the main coolant pump and adopting the preset protection control rule corresponding to the preset protection condition matched with the actual mode to control the main coolant pump comprises the following steps:

in the starting mode, judging whether state parameters of all relevant equipment in the reactor coolant system meet a first protection condition, if so, determining to enter the non-forced starting mode, and adopting a corresponding first protection control rule to control the starting of the main coolant pump; wherein the first protection condition is used for representing that all associated devices meet a set starting condition;

If the protection condition is not met, determining to enter the forced starting mode, and adopting a corresponding second protection control rule to control the main coolant pump to start under the protection condition.

Preferably, the operating modes of the main coolant pump include a single operating mode and a group operating mode;

in the single working mode, a single main coolant pump is in an independent control state;

in the group working mode, a plurality of main coolant pumps in the same group are in a synchronous control state;

determining if the reactor coolant system satisfies all conditions, if so, receiving a first external execution command to switch the main coolant pump from a single mode of operation to the group mode of operation,

all states are:

for other main coolant pumps in the same group except the first main coolant pump, the single rotating speed command is consistent with the group rotating speed command, the frequency converter is in a remote control running state, the reactor is in a shutdown state, and each main coolant pump is at a reference rotating speed;

The main coolant pumps of the same group are controlled.

Preferably, the step of controlling the main coolant pumps of the same group comprises:

judging whether the reactor coolant system meets at least one of the following conditions, and if so, controlling the main coolant pump to exit from a group working mode to restore to the single working mode;

at least one state is:

for other main coolant pumps in the same group except the first main coolant pump, the single rotating speed command is inconsistent with the group rotating speed command, and the frequency converter is in an in-situ mode, the communication of the frequency converter is interrupted, and the running signal of the frequency converter disappears;

or alternatively, the first and second heat exchangers may be,

judging whether the reactor coolant system meets at least one of the following conditions, if so, receiving a second external execution instruction to control all the main coolant pumps to exit from a group working mode so as to restore to the single working mode;

at least one state is:

the reactor is not shut down, the main coolant pump is at a reference speed, no main coolant pump speed change operation, and the remaining main coolant pumps are not running.

Preferably, different preset group mode control instructions correspond to different preset protection conditions and corresponding preset protection control rules;

The step of controlling the main coolant pumps of the same group by the control law comprises:

the actual burst mode control instruction is acquired,

based on the actual group mode control instruction, controlling all the main coolant pumps in the same group by adopting the preset protection control rule corresponding to the preset protection condition matched with the actual mode;

wherein the actual group mode control command corresponds to controlling at least one of the rotational speed, rotational speed lock, normal shut down or emergency shut down of all the main coolant pumps of the same group.

Preferably, the speed gear modes of the main coolant pump correspond to different preset speed gears;

wherein different preset rotational speed gears correspondingly match the preset protection conditions and the preset protection control rules;

acquiring an actual rotating speed gear;

and acquiring the preset protection control rule corresponding to the preset protection condition matched with the actual rotating speed gear, and controlling the main coolant pump.

Preferably, the power supply mode includes a frequency conversion mode and a power grid mode;

when the actual mode of the main coolant pump is a frequency conversion mode, controlling the power supply of a frequency converter to a motor of the main coolant pump to step up;

when the actual mode of the main coolant pump is a power grid mode, when the voltage frequency of the main coolant pump is increased to the same frequency as the voltage frequency of the power grid through the frequency converter, the frequency converter is driven to execute power supply switching operation, and the bypass frequency converter is controlled to be placed in a standby state.

Preferably, the step of obtaining the actual mode of the main coolant pump and controlling the main coolant pump by using the preset protection control rule corresponding to the preset protection condition matched with the actual mode includes:

in the shutdown mode, when the reactor coolant system is operated in a water entity operation mode and pressure fluctuation occurs to cause the water entity pressure to be lower than a specific value, triggering and controlling to shutdown all the main coolant pumps;

And when the main coolant pump operates under the working condition of non-full rotation speed and any working condition that the main coolant pump is in unexpected stopping operation occurs, triggering and controlling the main coolant pump which is in stopping operation.

Preferably, the control method is realized based on a digital control device platform NuCON of the nuclear power station;

and/or the number of the groups of groups,

the control method further includes:

and when an abnormal event of the reactor coolant system is detected, a third preset protection control rule matched with the abnormal event is adopted to control the main coolant pump.

The present disclosure also provides a control device for a main coolant pump in a reactor coolant system, characterized in that the control device comprises:

the preset module is used for presetting the main coolant pump in the reactor coolant system, and corresponding preset protection conditions and preset protection control rules under each set control mode;

and the protection control module is used for acquiring the actual mode of the main coolant pump and controlling the main coolant pump by adopting the preset protection control rule corresponding to the preset protection condition matched with the actual mode.

the protection control module is further configured to determine, in the start-up mode, whether status parameters of all devices associated with the reactor coolant system meet a first protection condition, and if so, determine to enter the non-forced start-up mode, and control the start-up of the main coolant pump by using a corresponding first protection control rule; wherein the first protection condition is used for representing that all associated devices meet a set starting condition;

the protection control module is further configured to determine whether the reactor coolant system satisfies all conditions, and if so, receive a first external execution command to switch the main coolant pump from a single mode of operation to the group mode of operation,

All states are:

the main coolant pumps of the same group are controlled.

Preferably, the protection control module is further configured to determine whether the reactor coolant system satisfies at least one of the following conditions, and if so, control the main coolant pump to exit from the group operation mode to restore to the single operation mode;

at least one state is:

or alternatively, the first and second heat exchangers may be,

At least one state is:

the protection control module is further configured to obtain an actual group mode control instruction,

the protection control module is also used for acquiring an actual rotating speed gear;

the protection control module is also used for controlling the power supply of the frequency converter to the main coolant pump motor to step up when the actual mode of the main coolant pump is a frequency conversion mode;

Preferably, the protection control module is further configured to trigger and control to shut down all of the main coolant pumps in the shutdown mode when the reactor coolant system is operating in a water entity operation mode and pressure fluctuations occur such that the water entity pressure is below a specific value;

Preferably, the control method is realized based on a digital control device platform NuCON of the nuclear power station.

Preferably, the control device further includes:

and the abnormality processing module is used for controlling the main coolant pump by adopting a preset third protection control rule matched with the abnormal event when the abnormal event of the reactor coolant system is detected.

The disclosure also provides a reactor coolant system comprising a control device for a main coolant pump in the reactor coolant system described above.

The present disclosure also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and operable on the processor, the processor implementing the above-described method of controlling a main coolant pump in a reactor coolant system when executing the computer program.

The present disclosure also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements the above-described method of controlling a main coolant pump in a reactor coolant system.

On the basis of conforming to the common knowledge in the art, the preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present disclosure.

The positive progress effect of the present disclosure is:

according to the control scheme of the main coolant pump based on the NuCON platform, corresponding preset protection conditions and preset protection control rules under preset control modes (such as a starting mode, an operating mode, a speed gear mode, a power supply mode, a shutdown mode and the like) are set in advance, so that operators are guided to realize the operation operations of starting, running, power supply switching, shutdown and the like of the main coolant pump, the personnel operation workload and the personnel investment cost are greatly reduced, the possibility of danger caused by personnel errors is effectively improved, and the safety, stability and reliability of the overall operation of the reactor coolant system are effectively ensured; in addition, the system can provide corresponding protection control functions for abnormal events so as to effectively avoid the probability of equipment damage caused by accident working conditions, and further ensure the safety and stability of the overall operation of the system.

Drawings

FIG. 1 is a flow schematic of a method of controlling a main coolant pump in a reactor coolant system of embodiment 1 of the present disclosure;

FIG. 2 is a block schematic diagram of a controller system of a main coolant pump in a reactor coolant system of embodiment 3 of the present disclosure;

FIG. 3 is a block schematic diagram of a controller system of a main coolant pump in a reactor coolant system of example 4 of the present disclosure;

FIG. 4 is a schematic block diagram of a reactor coolant system of example 5 of the present disclosure;

fig. 5 is a schematic block diagram of an electronic device according to embodiment 6 of the present disclosure.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.

Example 1

As shown in fig. 1, the control method of the main coolant pump in the reactor coolant system of the present embodiment includes:

s101, presetting a main coolant pump in a reactor coolant system, and corresponding preset protection conditions and preset protection control rules under each set control mode;

the different setting control modes comprise at least one of a starting mode, an operating mode, a speed gear mode, a power supply mode and a shutdown mode corresponding to the main coolant pump;

S102, acquiring an actual mode of the main coolant pump, and controlling the main coolant pump by adopting a preset protection control rule corresponding to preset protection conditions matched with the actual mode.

In the scheme, a novel control scheme of the main coolant pump is provided, corresponding preset protection conditions and preset protection control rules under preset control modes (such as a starting mode, an operating mode, a speed gear mode, a power supply mode, a shutdown mode and the like) are set in advance, so that operators are guided to realize the starting, running, power supply switching, shutdown and other running operations of the main coolant pump, the personnel operation workload and the labor input cost are greatly reduced, the possibility of danger caused by personnel errors is effectively improved, the efficiency and the accuracy of the control of the main coolant pump in the reactor coolant system are effectively guaranteed, and the safety, the stability and the reliability of the overall running of the reactor coolant system are effectively guaranteed.

Example 2

The control method of the main coolant pump in the reactor coolant system of this embodiment is a further improvement of embodiment 1, specifically:

in one embodiment, the start-up mode includes a non-forced start-up mode and a forced start-up mode;

Step S102, including:

in a starting mode, judging whether state parameters of all associated equipment in a reactor coolant system meet a first protection condition, if so, determining to enter a non-forced starting mode, and adopting a corresponding first protection control rule to control the starting of a main coolant pump; wherein the first protection condition is used for representing that all the associated devices meet the set starting condition;

if the protection condition is not satisfied, determining to enter a forced starting mode, and adopting a corresponding second protection control rule to control the main coolant pump to start under the protection condition.

A non-forced start mode of the main coolant pump corresponds to a start-up lockout function of the main coolant pump:

before the main coolant pump is started, the reactor coolant system, a related process system, main coolant pump equipment, frequency converter equipment and the like are required to be confirmed to set starting conditions before the main coolant pump is started, and the main coolant pump can be allowed to be started after all the conditions are met.

Specifically, (1) the reactor coolant system pressure at the start-up of the main coolant pump should meet the cavitation margin requirement (NPSH) necessary at the start-up of the main coolant pump; specifically, the main coolant pump should be allowed to start only when the calculated cavitation margin from the reactor coolant temperature and the actual pressure is greater than necessary.

(2) The stabilizer level should meet the main coolant pump start condition when the main coolant pump is started: when the main coolant pump is started in a hot state, the pressure stabilizer liquid level must be smaller than a specific value to allow the main coolant pump to be started; there is no such limitation when the main coolant pump is cold started.

(3) The temperature difference between the temperature of the steam generator and the primary loop when the main coolant pump is started meets the starting condition of the main coolant pump: when the main coolant pump is started in a cold state, the reverse temperature difference between the steam generator and the primary loop is required to be smaller than a specific value to allow the main coolant pump to be started; there is no such limitation when the main coolant pump is started in a hot state.

(4) The main coolant pump to be started must be started under the rotation speed 2 instruction when the main coolant pump is started, and other loop main coolant pumps are in a stop state or run under the rotation speed 2 instruction, so that the main coolant pump can be allowed to be started; wherein, the rotating speed 1 is used for stopping the pump; the rotating speed 2 is used for starting a main coolant pump, and the rotating speed 3 is used for establishing the spraying flow of the pressure stabilizer, and the same applies below;

(5) When the main coolant pump is started, the frequency converter must be in a ready and ready state to allow the main coolant pump to start.

(6) When the main coolant pump is started, the actual rotational speed fed back by the rotational speed sensor of the main coolant pump to be started must be smaller than a specific value to allow the main coolant pump to be started.

(7) The reactor shutdown circuit breaker must be fully opened at the start of the main coolant pump to start the main coolant pump.

Of course, besides the listed protection conditions, corresponding adjustment can be performed based on actual scene requirements, which is not described herein.

Forced start mode of the main coolant pump corresponds to a start-up lockout bypass function of the main coolant pump:

when the partially set start condition in the non-forced start mode is not satisfied, the main coolant pump may be forced to be started by the start lock bypass function, but the following conditions must be satisfied to bypass the start lock function to start the main coolant pump.

Specifically, (1) when the main coolant pump is started, the main coolant pump to be started must be started at the speed 2 command, and the other loop main coolant pumps are in a shutdown state or operated at the speed 2 command to allow the main coolant pump to be started.

(2) The frequency converter must be in a ready-to-operate and ready state at the start of the main coolant pump to allow the main coolant pump to start.

(3) When the main coolant pump to be started is already in the bypass state, the operator is required to confirm the main coolant pump start condition again when a change occurs in the blocked condition.

In the scheme, the main coolant pump is efficiently and accurately protected and controlled by adopting matched protection control logic in time according to different conditions under the starting mode, so that the precision and rationality of the starting control are ensured.

In an embodiment, the operating modes of the main coolant pump include a single operating mode and a group operating mode;

in the single working mode, a single main coolant pump is in an independent control state, and at the moment, the single main coolant pump corresponds to a control panel;

in the group working mode, a plurality of main coolant pumps in the same group are in a synchronous control state; at the moment, a plurality of main coolant pumps in the same group correspond to one control panel;

specifically, the main coolant pump can be independently controlled in a single working mode, and other main coolant pumps are not influenced; and in the group working mode, the specific soft controller is used for uniformly controlling all the main coolant pumps which are operated, so that all the main coolant pumps are ensured to respond simultaneously.

Step S102, including:

judging whether the reactor coolant system satisfies all conditions, if so, receiving a first external execution instruction to switch the main coolant pump from a single operation mode to a group operation mode,

All states are:

the main coolant pumps of the same group are controlled.

In the scheme, the matched protection control logic is adopted in time to carry out efficient and accurate protection control on the main coolant pump according to different conditions under the operation mode, so that the timely switching of the operation mode of the main coolant pump is ensured.

In an embodiment, the step of controlling the main coolant pumps of the same group comprises:

judging whether the reactor coolant system meets at least one of the following conditions, and if so, controlling the main coolant pump to exit from the group working mode to restore to the single working mode;

at least one state is:

Or alternatively, the first and second heat exchangers may be,

judging whether the reactor coolant system meets at least one of the following conditions, if so, receiving a second external execution instruction to control all the main coolant pumps to exit from the group working mode so as to restore to the single working mode;

at least one state is:

Specifically, the blocking and switching functions of the group operation mode and the simplex mode of the corresponding main coolant pump:

the initial state of the main coolant pump before starting is defaulted to a single working mode, and when a certain condition is met, operators are allowed to manually switch the main coolant pump in the single working mode to a group working mode; clicking operation is performed in an operation interface corresponding to a specific operator so as to switch a single working mode and a group working mode; the control interface is arranged on the panel through highlighting and other display modes so as to distinguish different working modes.

For all main coolant pumps in the group, if the single rotating speed command is consistent with the group rotating speed command, the frequency converter is in a remote control running state, the reactor is in a shutdown state, and the main coolant pumps are in a reference rotating speed and are not operated at a changed rotating speed.

After the main coolant pump has entered the group operation mode, the group operation mode is exited when the following occurs: the single rotational speed command is inconsistent with the group rotational speed command, the frequency converter is in an in-situ mode, the frequency converter communication is interrupted, and the frequency converter operation signal disappears.

After the main coolant pump has entered the group operation mode, the operator is allowed to manually switch the main coolant pump in the group operation mode to the single operation mode when the following conditions are met: the reactor is not shut down, the reference speed has been reached, no main coolant pump speed change operation, and the remaining main coolant pumps are not running.

In the scheme, the actual state of the main coolant pump is compared with preset protection conditions, whether the main coolant pump can enter a group working mode or not is timely determined, and if so, a user is allowed to manually switch so as to realize timely and flexible switching of the group or single working mode; for the grouped main coolant pumps, the states of the main coolant pumps are detected in real time, and when the states meet different conditions, corresponding protection control flows are automatically executed, so that the timely, reasonable and reliable control of the main coolant pumps is ensured, and the safety of the overall operation of the whole reactor coolant system is also ensured.

In an embodiment, different preset group mode control instructions correspond to different preset protection conditions and corresponding preset protection control rules;

the step of controlling the main coolant pumps of the same group by a control law comprises:

the actual burst mode control instruction is acquired,

based on the actual grouping mode control instruction, a preset protection control rule corresponding to preset protection conditions matched with the actual mode is adopted to control all main coolant pumps in the same group;

wherein the actual group mode control command corresponds to controlling at least one of the rotational speed, rotational speed lock, normal shut down or emergency shut down of all main coolant pumps of the same group.

Specifically, the control function of the main coolant pump in the group operation mode corresponds to:

(1) Rotational speed control function with main coolant pump in group operation mode:

when all the main coolant pumps are in the group working mode, the group working mode can be used for simultaneously controlling all the main coolant pumps so as to realize synchronous action of all the main coolant pumps; the group working mode has a gear control function; the rotating speeds 1 to 3 are the same as the single working mode, and the rotating speeds 4 and 5 are respectively corresponding to the power rotating speed and the full rotating speed of the main coolant pump.

(2) Rotational speed lock function of the main coolant pump in group operation mode:

similar to the monomer mode of operation, the main coolant pump speed function will be blocked for the following conditions: in addition to the general requirements, the reactor is in an operating state, the main coolant pump does not enter a reference rotating speed, the main coolant pump is not in a group working mode, the rotating speed of the group working mode is changed, and the like, the continuous lifting rotating speed operation can be required to be locked, and the power protection of the main coolant pump is locked (the power protection of the main coolant pump can be allowed to be raised to a specific rotating speed after the temperature of the coolant of the reactor is larger than a specific value); specifically, other conditions can be adjusted or added according to actual scene requirements, which are not described herein.

(3) Normal shutdown function of the main coolant pump in group operation mode:

under the normal operation condition, the main coolant pump is stopped and stopped simultaneously through the rotating speed 1 command of the group working mode; the main coolant pump shutdown function will be blocked for the following conditions: the reactor is in an operational state, the main coolant pump does not enter a reference rotational speed, the main coolant pump is put into operation, the group operation mode rotational speed is changed to operate.

(4) Pump emergency shutdown function with primary coolant in group mode:

Under the condition that the main coolant pumps need to be emergently stopped, the emergency stop function of the group working mode is used for disconnecting the upstream feeder circuit breaker of the main coolant pumps to realize the emergency stop of all the main coolant pumps; in addition, the emergency shutdown function is blocked when the reactor is in an operational state.

In the scheme, the matched protection control logic is adopted in time to carry out efficient and accurate protection control on the main coolant pump according to different conditions under the group working mode, so that the accuracy and rationality of the protection control on the main coolant pump under the group working mode are ensured.

In an embodiment, the speed gear modes of the main coolant pump correspond to different preset speed gears;

wherein, different preset rotational speed gears correspond to matched preset protection conditions and preset protection control rules;

step S102, including:

acquiring an actual rotating speed gear;

and acquiring a preset protection control rule corresponding to a preset protection condition matched with the actual rotation speed gear, and controlling the main coolant pump.

Specifically, the rotational speed control function in the single operation mode of the main coolant pump corresponds to:

in the single mode of operation of the main coolant pump, three rotational speed gears are typically provided to meet the control demands of the main coolant pump normal start and the main coolant pump single test. Wherein, the rotating speed 1 is used for stopping the pump; the rotation speed 2 is used for the main coolant pump start and the rotation speed 3 is used for establishing the pressure stabilizer spray flow. In order to prevent mutual interference in the process of starting the main coolant pump caused by human errors of operators, the following locking is carried out on the rotation speed gear operation of the main coolant pump:

(1) For speed 1, the single mode speed 1 function is blocked when the following occurs: the reactor is in an operating state, the main coolant pump does not enter the reference rotational speed, the frequency converter is not in an operating state, the single operating mode rotational speed is changed to operate, and the rest of the main coolant pumps are in an operating state.

(2) For speed 2, there are two cases, depending on whether the main coolant pump is started or not: for an inactive main coolant pump, shutting down the speed 2 function when the reactor is not shut down or the monomer mode of operation speed change is operating; for the main coolant pump that is started, the speed 2 function is blocked when the following occurs: the reactor is not shut down, the reference speed is not reached, the single operating mode speed is changed to operate, and the rest of the main coolant pumps are in an operating state.

(3) For speed 3, the single body mode speed 3 function is blocked when the following occurs: the reactor is in an operating state, the main coolant pump does not enter the reference rotational speed, the frequency converter is not in an operating state, the single operating mode rotational speed is changed to operate, and the rest of the main coolant pumps are in an operating state.

In the scheme, the matched protection control logic is adopted in time to carry out efficient and accurate protection control on the main coolant pump according to different conditions in the speed gear mode, so that the accuracy and rationality of the protection control on the main coolant pump in the speed gear mode are ensured.

In one embodiment, the power modes include a variable frequency mode and a grid mode.

Step S102, including:

when the actual mode of the main coolant pump is a frequency conversion mode, controlling the power supply of the frequency converter to the motor of the main coolant pump so as to gradually increase the speed;

when the actual mode of the main coolant pump is the power grid mode, when the voltage frequency of the main coolant pump is increased to the same frequency as the voltage frequency of the power grid through the frequency converter, the frequency converter is driven to execute power supply switching operation, and the bypass frequency converter is controlled to be placed in a standby state.

Specifically, the variable frequency mode and grid mode switching function of the main coolant pump is corresponded:

for a single main coolant pump, two modes of operation are provided, depending on the manner in which it is supplied: a variable frequency mode and a grid mode; in the variable frequency mode, the frequency converter can supply power to the motor of the main coolant pump to realize gradual speed rise; in the power grid mode, the power grid directly supplies power, when the main coolant pump increases the voltage frequency to the same frequency as the power grid through the frequency converter, the frequency converter executes power supply switching operation, and the bypass frequency converter is placed in a standby state so as to improve the operation reliability; in addition, when the actual running rotating speed of the main coolant pump is lower than the rated rotating speed, the frequency conversion switching power grid function is locked; when the power grid switches the frequency conversion mode, the power grid can be switched to the frequency conversion mode after an allowable switching signal is generated on the side of the frequency converter.

In the scheme, the main coolant pump is efficiently and accurately protected and controlled by adopting matched protection control logic in time according to different conditions in the power supply mode, so that the precision and rationality of the protection control of the main coolant pump in the power supply mode are ensured.

In one embodiment, step S102 includes:

in the shutdown mode, when the reactor coolant system is operated in a water entity operation mode and pressure fluctuation occurs to cause the water entity pressure to be lower than a specific value, triggering and controlling all main coolant pumps to be shut down;

when the main coolant pump operates under the working condition of non-full rotation speed and any working condition of unexpected stopping of the main coolant pump occurs, the main coolant pump which is stopped and operated is triggered and controlled.

Specifically, the shutdown protection function of the main coolant pump corresponds to:

(1) The reactor coolant system water entity operation mode is a low-pressure protection shutdown pump, specifically, when the reactor coolant system operation and the water entity operation mode are in the reactor coolant system operation mode, if the pressure fluctuation occurs to cause the water entity pressure to be lower than a specific value, all main coolant pumps are triggered to be automatically shut down.

(2) For unexpected pump shut down, when the main coolant pump is operating at a non-full speed condition, if any unexpected pump shut down condition of the main coolant pump occurs, it may trigger the shut down of all of the on-stream main coolant pumps.

In the scheme, the main coolant pump is protected and controlled efficiently and accurately by adopting matched protection control logic in time according to different conditions in the shutdown mode, so that the precision and rationality of the protection control of the main coolant pump in the shutdown mode are ensured.

In an implementation manner, the control method of the present embodiment is implemented based on a digital control device platform NuCON of the nuclear power plant.

Specifically, the reactor coolant system is arranged in the passive pressurized water reactor nuclear power station, and the control function of the main coolant pump in the reactor coolant system is realized based on the software configuration in the NuCON platform; of course, other control platforms for implementing the corresponding functions may be employed, so long as protection control logic of the corresponding main coolant pump can be implemented, and will not be described herein.

In one embodiment, the control method further comprises:

In this scheme, also can provide corresponding protection control function to the unusual event to effectively avoid causing the probability of equipment damage under the accident operating mode, also further guaranteed the safety and the stability of system's overall operation simultaneously.

Example 3

As shown in fig. 2, the control device of the main coolant pump in the reactor coolant system in this embodiment includes:

the preset module 1 is used for presetting a main coolant pump in a reactor coolant system, and corresponding preset protection conditions and preset protection control rules under each set control mode;

and the protection control module 2 is used for acquiring the actual mode of the main coolant pump and controlling the main coolant pump by adopting a preset protection control rule corresponding to a preset protection condition matched with the actual mode.

In the scheme, a novel control scheme of the main coolant pump is provided, corresponding preset protection conditions and preset protection control rules under preset control modes (such as a starting mode, an operating mode, a speed gear mode, a power supply mode, a shutdown mode and the like) are reduced, operators are guided to realize the starting, running, power supply switching, shutdown and other running operations of the main coolant pump, so that the personnel operation workload and the labor input cost are greatly reduced, the possibility of danger caused by personnel errors is effectively improved, the efficiency and the accuracy of the control of the main coolant pump in the reactor coolant system are effectively guaranteed, and the safety, the stability and the reliability of the overall running of the reactor coolant system are effectively guaranteed.

Example 4

As shown in fig. 3, the control device of the main coolant pump in the reactor coolant system in this embodiment is a further improvement in embodiment 3, specifically:

the protection control module 2 is further configured to determine, in a start-up mode, whether status parameters of all devices associated with the reactor coolant system meet a first protection condition, and if so, determine to enter a non-forced start-up mode, and control the start-up of the main coolant pump by using a corresponding first protection control rule; wherein the first protection condition is used for representing that all the associated devices meet the set starting condition;

(3) When the main coolant pump to be started is already in the bypass state, the operator is required to confirm the main coolant pump start condition again when a change occurs in the blocked condition. In the scheme, the main coolant pump is efficiently and accurately protected and controlled by adopting matched protection control logic in time according to different conditions under the starting mode, so that the precision and rationality of the starting control are ensured.

The protection control module 2 is also adapted to judging whether the reactor coolant system fulfils all conditions, and if so, to receiving a first external execution command to switch the main coolant pump from the single operation mode to the group operation mode,

all states are:

the main coolant pumps of the same group are controlled.

In an embodiment, the protection control module 2 is further configured to determine whether the reactor coolant system satisfies at least one of the following conditions, and if so, control the main coolant pump to exit the group operation mode to restore to the single operation mode;

at least one state is:

Or alternatively, the first and second heat exchangers may be,

at least one state is:

the protection control module 2 is also arranged to obtain the actual group mode control instruction,

(3) Normal shutdown function of the main coolant pump in group operation mode:

(4) Pump emergency shutdown function with primary coolant in group mode:

the protection control module 2 is also used for acquiring an actual rotating speed gear;

The protection control module 2 is further used for controlling the frequency converter to supply power to the motor of the main coolant pump to step up when the actual mode of the main coolant pump is the frequency conversion mode;

In an embodiment, the protection control module 2 is further configured to trigger control of all main coolant pumps to be shut down when the reactor coolant system is operating in the water entity operation mode and pressure fluctuations occur such that the water entity pressure is below a certain value in the shutdown mode;

In one embodiment, the control device is implemented based on a nuclear power plant digital control device platform NuCON.

In an embodiment, the control device of the present embodiment further includes:

and the abnormality processing module 3 is used for controlling the main coolant pump by adopting a preset third protection control rule matched with the abnormal event when the abnormal event of the reactor coolant system is detected.

Example 5

As shown in fig. 4, the reactor coolant system of the present embodiment includes the control device 100 of the main coolant pump in the reactor coolant system described above.

Wherein the reactor coolant system is disposed in an passive pressurized water reactor nuclear power plant.

The reactor coolant system in the scheme is integrated with the control device of the main coolant pump in the embodiment 3 or 4, and can guide operators to realize the operation operations such as starting, running, power supply switching, shutdown and the like of the main coolant pump by presetting corresponding preset protection conditions and preset protection control rules under preset control modes (such as starting mode, running mode, speed gear mode, power supply mode, shutdown mode and the like), thereby greatly reducing the workload of personnel operation, the labor input cost and the possibility of danger caused by personnel errors, effectively improving the efficiency and the accuracy of the control of the main coolant pump in the reactor coolant system, and effectively guaranteeing the safety, the stability and the reliability of the integral operation of the reactor coolant system; in addition, the system can provide corresponding protection control functions for abnormal events so as to effectively avoid the probability of equipment damage caused by accident working conditions, and further ensure the safety and stability of the overall operation of the system.

Example 6

Fig. 5 is a schematic structural diagram of an electronic device according to embodiment 3 of the present disclosure. The electronic device comprises a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the methods of the above embodiments when executing the program. The electronic device 30 shown in fig. 5 is merely an example and should not be construed to limit the functionality and scope of use of the disclosed embodiments.

As shown in fig. 5, the electronic device 30 may be in the form of a general purpose computing device, which may be a server device, for example. Components of electronic device 30 may include, but are not limited to: the at least one processor 31, the at least one memory 32, a bus 33 connecting the different system components, including the memory 32 and the processor 31.

The bus 33 includes a data bus, an address bus, and a control bus.

Memory 32 may include volatile memory such as Random Access Memory (RAM) 321 and/or cache memory 322, and may further include Read Only Memory (ROM) 323.

Memory 32 may also include a program/utility 325 having a set (at least one) of program modules 324, such program modules 324 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment.

The processor 31 executes various functional applications and data processing, such as the methods of the above-described embodiments of the present disclosure, by running a computer program stored in the memory 32.

The electronic device 30 may also communicate with one or more external devices 34 (e.g., keyboard, pointing device, etc.). Such communication may be through an input/output (I/O) interface 35. Also, model-generating device 30 may also communicate with one or more networks, such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet, via network adapter 36. As shown in fig. 5, network adapter 36 communicates with the other modules of model-generating device 30 via bus 33. It should be appreciated that although not shown in the figures, other hardware and/or software modules may be used in connection with the model-generating device 30, including, but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, data backup storage systems, and the like.

It should be noted that although several units/modules or sub-units/modules of an electronic device are mentioned in the above detailed description, such a division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more units/modules described above may be embodied in one unit/module in accordance with embodiments of the present disclosure. Conversely, the features and functions of one unit/module described above may be further divided into ones that are embodied by a plurality of units/modules.

Example 7

The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method in the above-described embodiment.

More specifically, among others, readable storage media may be employed including, but not limited to: portable disk, hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.

In a possible implementation, the disclosure may also be implemented in the form of a program product comprising program code for causing a terminal device to carry out the steps of implementing the method in the embodiments described above, when the program product is run on the terminal device.

Wherein the program code for carrying out the present disclosure may be written in any combination of one or more programming languages, and the program code may be executed entirely on the user device, partially on the user device, as a stand-alone software package, partially on the user device, partially on a remote device, or entirely on the remote device.

While specific embodiments of the present disclosure have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and the scope of the disclosure is defined by the appended claims. Various alterations and modifications may be made to these embodiments without departing from the principles and spirit of the disclosure, which are intended to be within the scope of the disclosure.

Claims

1. A method of controlling a main coolant pump in a reactor coolant system, the method comprising:

2. The method of controlling a main coolant pump in a reactor coolant system of claim 1, wherein the start mode includes a non-forced start mode and a forced start mode;

3. The method of controlling a main coolant pump in a reactor coolant system of claim 1, wherein the operating modes of the main coolant pump include a single operating mode and a group operating mode;

all states are:

The main coolant pumps of the same group are controlled.

4. A method of controlling a main coolant pump in a reactor coolant system as set forth in claim 3, wherein said step of controlling said main coolant pump of the same group comprises:

at least one state is:

or alternatively, the first and second heat exchangers may be,

at least one state is:

5. A method of controlling a main coolant pump in a reactor coolant system as claimed in claim 3, characterized in that different preset group mode control commands correspond to different preset protection conditions and to corresponding preset protection control rules;

the actual burst mode control instruction is acquired,

6. Method for controlling a main coolant pump in a reactor coolant system according to claim 1, characterized in that the speed gear modes of the main coolant pump correspond to different preset speed gears;

acquiring an actual rotating speed gear;

7. The method of controlling a main coolant pump in a reactor coolant system of claim 1, wherein the power mode includes a variable frequency mode and a grid mode;

8. The method of controlling a main coolant pump in a reactor coolant system according to claim 1, wherein the step of obtaining an actual pattern of the main coolant pump and controlling the main coolant pump using the preset protection control rule corresponding to the preset protection condition matched to the actual pattern includes:

9. The method of controlling a main coolant pump in a reactor coolant system according to any of the claims 1-8, characterized in that the control method is implemented based on a nuclear power plant digital control device platform NuCON;

and/or the number of the groups of groups,

the control method further includes:

10. A control device for a main coolant pump in a reactor coolant system, said control device comprising:

11. A reactor coolant system, characterized in that it comprises a control device for a main coolant pump in the reactor coolant system according to claim 9.

12. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method of controlling a main coolant pump in a reactor coolant system according to any of claims 1-9 when executing the computer program.

13. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements a method of controlling a main coolant pump in a reactor coolant system according to any of claims 1-9.