阅读说明：本技术 核电厂cpr1000机组的电动给水泵跳泵逻辑控制方法 (Nuclear power plant CPR1000 unit electric feed pump tripping logic control method ) 是由 唐磊 甘长贤 赵志玲 胡琰军 刘帅 于 2021-09-26 设计创作，主要内容包括：本发明涉及核电厂CPR1000机组的电动给水泵跳泵逻辑控制方法,包括：对核电机组的电功率信号进行实时监测,获取机组总电功率；对电动主给水泵的运行状态进行实时监测,获取电动主给水泵的运行状态信息；根据机组总电功率和电动主给水泵的运行状态信息,判断是否满足启动备用泵条件；若是,控制备用泵启动；若否,保持备用泵处于热备用状态。本发明对核电机组总电功率和电动主给水泵的运行状态信息进行实时监测和判断,并在满足启动备用泵条件时,立即启动备用泵,从而在电动主给水泵转速控制回路异常时启动备用泵,使二回路给水不受影响,避免机组在满功率运行时发生一回路超功率或跳堆,还为操纵员采取干预措施争取更多时间,避免事故继续扩大。(The invention relates to a pump tripping logic control method for an electric feed pump of a nuclear power plant CPR1000 unit, which comprises the following steps: monitoring an electric power signal of a nuclear power unit in real time to obtain the total electric power of the unit; monitoring the running state of the electric main water-feeding pump in real time to obtain the running state information of the electric main water-feeding pump; judging whether the conditions for starting the standby pump are met or not according to the total electric power of the unit and the running state information of the electric main water feeding pump; if yes, controlling the standby pump to start; if not, the standby pump is kept in a hot standby state. The invention carries out real-time monitoring and judgment on the total electric power of the nuclear power unit and the running state information of the electric main water-feeding pump, and immediately starts the standby pump when the condition of starting the standby pump is met, thereby starting the standby pump when the rotating speed control loop of the electric main water-feeding pump is abnormal, enabling the water supply of the two loops not to be influenced, avoiding the occurrence of primary loop overpower or pile jump when the unit runs at full power, also striving for more time for an operator to take intervention measures, and avoiding the continuous expansion of accidents.)

1. A pump tripping logic control method for an electric feed pump of a nuclear power plant CPR1000 unit is characterized by comprising the following steps:

monitoring electric power signals of a nuclear power unit in real time, and acquiring the total electric power of the unit;

monitoring the running state of the electric main water-feeding pump in real time, and acquiring the running state information of the electric main water-feeding pump;

judging whether the condition of starting a standby pump is met or not according to the total electric power of the unit and the running state information of the electric main water-feeding pump;

if yes, controlling the standby pump to start;

if not, the standby pump is kept in a hot standby state.

2. The nuclear power plant CPR1000 set motor-feed pump trip logic control method of claim 1, wherein the operational status information of the motor-driven main feed pump comprises: the system comprises an operation signal of the electric main water feed pump, an outlet pressure signal of the electric main water feed pump, a rotating speed control mode of the electric main water feed pump, an actual rotating speed signal of the electric main water feed pump and a rotating speed set value signal output by a rotating speed adjusting loop of the pump.

3. The nuclear power plant CPR1000 unit pump tripping logic control method according to claim 2, wherein the determining whether a startup backup pump condition is met according to the unit total electric power and the running state information of the electric main feed pump comprises:

acquiring the total electric power of the unit, an operation signal of the electric main water feed pump, an outlet pressure signal of the electric main water feed pump, a rotating speed control mode of the electric main water feed pump, an actual rotating speed signal of the electric main water feed pump and a rotating speed set value signal output by a rotating speed adjusting loop of the pump;

and judging whether the conditions for starting the standby pump are met or not according to the total electric power of the unit, the operation signal of the electric main water feed pump, the outlet pressure signal of the electric main water feed pump, the rotating speed control mode of the electric main water feed pump and the deviation value of the actual rotating speed signal of the electric main water feed pump and the rotating speed set value signal.

4. The nuclear power plant CPR1000 unit electric feed pump trip logic control method according to claim 3, wherein the determining whether the start-up backup pump condition is satisfied according to the unit total electric power, the operation signal of the electric main feed pump, the outlet pressure signal of the electric main feed pump, the rotation speed control mode of the electric main feed pump, and the deviation value of the actual rotation speed signal of the electric main feed pump from the rotation speed set value signal comprises:

judging whether the electric main water feed pump is in an operating state or not according to the operating signal of the electric main water feed pump;

judging whether the total electric power of the unit is greater than a power threshold value;

judging whether an outlet pressure signal of the electric main water supply pump is greater than an outlet pressure threshold value or not;

judging whether the rotation speed control mode of the electric main water feeding pump is automatic control or not;

judging whether the deviation between the actual rotating speed signal of the electric main water feeding pump and the rotating speed set value signal is greater than a deviation threshold value or not;

and if the electric main water-feeding pump is in a running state, the total electric power of the unit is greater than a power threshold value, an outlet pressure signal of the electric main water-feeding pump is greater than an outlet pressure threshold value, the rotating speed control mode of the electric main water-feeding pump is automatic control, and the deviation between an actual rotating speed signal of the electric main water-feeding pump and a rotating speed set value signal is greater than a deviation threshold value, judging that the condition of starting the standby pump is met.

5. The nuclear power plant CPR1000 set motor-feed pump trip logic control method of claim 4, wherein the power threshold is 55%; the outlet pressure threshold is 73 bar.g; the deviation threshold is: at 250 rpm.

6. The nuclear power plant CPR1000 set motor-feed pump trip logic control method of claim 4, further comprising:

if the electric main water-feeding pump is judged to be in a running state, the total electric power of the unit is greater than a power threshold, the pump outlet pressure of the electric main water-feeding pump is greater than an outlet pressure threshold, the rotating speed control mode of the electric main water-feeding pump is automatic control, and the deviation between the actual rotating speed of the electric main water-feeding pump and the set rotating speed is greater than a deviation threshold, delaying a preset time period;

after a preset time period is reached, continuously judging whether the electric main water-feeding pump is in a running state, judging whether the total electric power of the unit is greater than a power threshold value, judging whether the pump outlet pressure of the electric main water-feeding pump is greater than an outlet pressure threshold value, judging whether the rotating speed control mode of the electric main water-feeding pump is automatic control, and judging whether the deviation of the actual rotating speed of the electric main water-feeding pump and the set rotating speed is greater than a deviation threshold value;

and if the electric main water-feeding pump is in a running state, the total electric power of the unit is greater than a power threshold value, the pump outlet pressure of the electric main water-feeding pump is greater than an outlet pressure threshold value, the rotating speed control mode of the electric main water-feeding pump is automatic control, and the deviation between the actual rotating speed and the set rotating speed of the electric main water-feeding pump is greater than a deviation threshold value, starting the standby pump.

7. The method for controlling the electric feedwater pump trip logic of the nuclear power plant CPR1000 unit of any of claims 1-6, further comprising:

and when the standby pump is started, outputting an abnormal alarm signal of the electric main water feeding pump.

8. A nuclear power plant DCS control system, comprising: the monitoring system comprises a first monitoring module, a second monitoring module, a third monitoring module, a fourth monitoring module and a logic control module;

the logic control module is respectively connected with the first monitoring module, the second monitoring module, the third monitoring module, the fourth monitoring module and the standby pump;

the first monitoring module is used for monitoring the electric power of the nuclear power unit in real time to obtain the total electric power of the unit and judging the power according to the total electric power of the unit;

the second monitoring module is used for monitoring the running state of the electric main water-feeding pump in real time to acquire the running state information of the electric main water-feeding pump and judging the running state of the electric main water-feeding pump according to the running state information;

the third monitoring module is used for monitoring the pump outlet pressure of the electric main water-feeding pump in real time to obtain a pump outlet pressure signal of the electric main water-feeding pump and judging according to the pump outlet pressure of the electric main water-feeding pump;

the fourth monitoring module is used for monitoring the rotating speed control mode and the actual rotating speed of the electric main water-feeding pump in real time to obtain an actual rotating speed signal of the electric main water-feeding pump, and judging according to the rotating speed control mode, the actual rotating speed signal and a rotating speed set value of the electric main water-feeding pump;

the logic control module is used for controlling the standby pump to start or keeping the standby pump in a hot standby state according to the judgment result of the first monitoring module, the judgment result of the second monitoring module, the judgment result of the third monitoring module and the judgment result of the fourth monitoring module.

Technical Field

The invention relates to the technical field of nuclear power unit water pump control, in particular to a nuclear power plant CPR1000 unit electric feed pump tripping logic control method.

Background

A two-loop electric main water supply pump (APA pump) of a nuclear power plant provides a water supply function for a steam generator, three electric main water supply pumps are arranged in a CPR1000 nuclear power unit, a two-operation one-standby operation mode is adopted when the unit operates normally, and a control logic automatically starts a standby pump in an interlocking mode when any one electric main water supply pump trips or fails so as to meet the two-loop water supply function.

During the full power operation of No. 1 unit of a certain nuclear power plant, No. 1 and No. 3 electronic main feed water pump on-line operation, No. 2 electronic main feed water pump is in hot standby state. The speed of the pump is suddenly reduced from 4500rpm to 760rpm due to the abnormality of a control loop of the scoop tube of the No. 1 electric main water-feeding pump, the pressure of the pump outlet is reduced from 76.4bar.g to 31.3bar.g, but the No. 2 electric main water-feeding pump cannot be automatically started at the moment, and a main control operator needs to start the No. 2 electric main water-feeding pump emergently and manually reduce the power of the unit. During this period, the water level of No. 2 steam generator has been reduced to-1.06 m (reactor trip value: -1.26m), and the heat power of the primary circuit is up to 102.09%. The reason for the sudden drop of the rotating speed of the No. 1 electric main water-feeding pump is that a spoon pipe position sensor fails, so that the position of a spoon pipe is suddenly dropped to 0%, the rotating speed of the pump is suddenly reduced, meanwhile, the interlocking control logic design of the electric water-feeding pump is unreasonable, when the operating pump loses working output, a standby pump cannot be started in an interlocking manner in time, so that the standby pump cannot be automatically started, if a main control operator cannot intervene in time, the risk of the over-power of a loop and even the reactor tripping can exist, and therefore, the existing control logic cannot meet the water supply requirement of a secondary loop when a unit runs at full power.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a trip pump logic control method for a nuclear power plant CPR1000 unit electric feed pump, aiming at the above-mentioned defects of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: a method for logically controlling the pump tripping of an electric feed pump of a nuclear power plant CPR1000 unit is constructed, and comprises the following steps:

monitoring electric power signals of a nuclear power unit in real time, and acquiring the total electric power of the unit;

monitoring the running state of the electric main water-feeding pump in real time, and acquiring the running state information of the electric main water-feeding pump;

judging whether the condition of starting a standby pump is met or not according to the total electric power of the unit and the running state information of the electric main water-feeding pump;

if yes, controlling the standby pump to start;

if not, the standby pump is kept in a hot standby state.

In the method for logically controlling the pump tripping of the electric feed pump of the nuclear power plant CPR1000 unit, the operation state information of the electric main feed pump comprises: the system comprises an operation signal of the electric main water feed pump, an outlet pressure signal of the electric main water feed pump, a rotating speed control mode of the electric main water feed pump, an actual rotating speed signal of the electric main water feed pump and a rotating speed set value signal output by a rotating speed adjusting loop of the pump.

In the method for logically controlling the pump tripping of the electric feed pump of the nuclear power plant CPR1000 unit, judging whether the condition of starting the standby pump is met or not according to the total electric power of the unit and the running state information of the electric main feed pump comprises the following steps:

acquiring the total electric power of the unit, an operation signal of the electric main water feed pump, an outlet pressure signal of the electric main water feed pump, a rotating speed control mode of the electric main water feed pump, the actual rotating speed of the electric main water feed pump and a rotating speed set value signal output by a rotating speed adjusting loop of the pump;

and judging whether the conditions for starting the standby pump are met or not according to the total electric power of the unit, the operation signal of the electric main water-feeding pump, the pump outlet pressure of the electric main water-feeding pump, the rotating speed control mode of the electric main water-feeding pump, the actual rotating speed signal of the electric main water-feeding pump and the deviation value of the rotating speed set value signal.

In the method for logically controlling the pump tripping of the electric main feed pump of the nuclear power plant CPR1000 unit, the judging whether the conditions for starting the backup pump are met according to the deviation values of the total electric power of the unit, the operation signal of the electric main feed pump, the outlet pressure signal of the electric main feed pump, the rotating speed control mode of the electric main feed pump, the actual rotating speed signal of the electric main feed pump and the rotating speed set value signal comprises the following steps:

judging whether the electric main water feed pump is in an operating state or not according to the operating signal of the electric main water feed pump;

judging whether the total electric power of the unit is greater than a power threshold value;

judging whether an outlet pressure signal of the electric main water supply pump is greater than an outlet pressure threshold value or not;

judging whether the rotation speed control mode of the electric main water feeding pump is automatic control or not;

judging whether the deviation between the actual rotating speed signal of the electric main water feeding pump and the rotating speed set value signal is greater than a deviation threshold value or not;

and if the electric main water-feeding pump is in a running state, the total electric power of the unit is greater than a power threshold value, an outlet pressure signal of the electric main water-feeding pump is greater than an outlet pressure threshold value, the rotating speed control mode of the electric main water-feeding pump is automatic control, and the deviation between an actual rotating speed signal of the electric main water-feeding pump and a rotating speed set value signal is greater than a deviation threshold value, judging that the condition of starting the standby pump is met.

In the logical control method for the electric feed pump tripping of the nuclear power plant CPR1000 unit, the power threshold value is 55%; the outlet pressure threshold is 73 bar.g; the deviation threshold is: at 250 rpm.

In the method for logically controlling the pump tripping of the electric feed water pump of the nuclear power plant CPR1000 unit, the method further comprises the following steps:

if the electric main water-feeding pump is judged to be in an operating state, the total electric power of the unit is greater than a power threshold, an outlet pressure signal of the electric main water-feeding pump is greater than an outlet pressure threshold, the rotating speed control mode of the electric main water-feeding pump is automatic control, and the deviation between an actual rotating speed signal of the electric main water-feeding pump and a rotating speed set value signal is greater than a deviation threshold, delaying a preset time period;

after a preset time period is reached, continuously judging whether the electric main water-feeding pump is in a running state, judging whether the total power of the unit is greater than a power threshold value, judging whether an outlet pressure signal of the electric main water-feeding pump is greater than an outlet pressure threshold value, judging whether a rotating speed control mode of the electric main water-feeding pump is automatic control or not and judging whether the deviation of the actual rotating speed of the electric main water-feeding pump and a set rotating speed is greater than a deviation threshold value or not;

and if the electric main water-feeding pump is in a running state, the total electric power of the unit is greater than a power threshold value, an outlet pressure signal of the electric main water-feeding pump is greater than an outlet pressure threshold value, the rotating speed control mode of the electric main water-feeding pump is automatic control, and the deviation between an actual rotating speed signal of the electric main water-feeding pump and a rotating speed set value signal is greater than a deviation threshold value, starting the standby pump.

In the method for logically controlling the pump tripping of the electric feed water pump of the nuclear power plant CPR1000 unit, the method further comprises the following steps:

and when the standby pump is started, outputting an abnormal alarm signal of the electric main water feeding pump.

The invention also provides a nuclear power plant DCS control system, comprising: the monitoring system comprises a first monitoring module, a second monitoring module, a third monitoring module, a fourth monitoring module and a logic control module;

the logic control module is respectively connected with the first monitoring module, the second monitoring module, the third monitoring module, the fourth monitoring module and the standby pump;

the first monitoring module is used for monitoring the electric power of the nuclear power unit in real time to obtain the total electric power of the unit and judging the power according to the total electric power of the unit;

the second monitoring module is used for monitoring the running state of the electric main water-feeding pump in real time to acquire the running state information of the electric main water-feeding pump and judging the running state of the electric main water-feeding pump according to the running state information;

the third monitoring module is used for monitoring the pump outlet pressure of the electric main water-feeding pump in real time to obtain the pump outlet pressure of the electric main water-feeding pump and judging according to the pump outlet pressure of the electric main water-feeding pump;

the fourth monitoring module is used for monitoring the rotating speed control mode and the actual rotating speed of the electric main water-feeding pump in real time to obtain an actual rotating speed signal of the electric main water-feeding pump, and judging according to the rotating speed control mode, the actual rotating speed signal and a rotating speed set value of the electric main water-feeding pump;

the logic control module is used for controlling the standby pump to start or keeping the standby pump in a hot standby state according to the judgment result of the first monitoring module, the judgment result of the second monitoring module, the judgment result of the third monitoring module and the judgment result of the fourth monitoring module.

The implementation of the logical control method for the pump tripping of the electric feed pump of the nuclear power plant CPR1000 unit has the following beneficial effects: the method comprises the following steps: monitoring the electric power of a nuclear power unit in real time, and acquiring the total electric power of the unit; monitoring the running state of the electric main water-feeding pump in real time, and acquiring the running state information of the electric main water-feeding pump; judging whether the conditions for starting the standby pump are met or not according to the total electric power of the unit and the running state information of the electric main water feeding pump; if yes, controlling the standby pump to start; if not, the standby pump is kept in a hot standby state. The invention monitors the total electric power of the nuclear power unit and the running state information of the electric main water-feeding pump in real time, and immediately starts the standby pump when the condition of starting the standby pump is met, thereby starting the standby pump in time when the rotating speed control loop of the electric main water-feeding pump is abnormal, leading the water supply of the two loops not to be influenced, avoiding the over-power or pile-jumping of the primary loop, simultaneously striving for more time for an operator to take intervention measures, and avoiding the continuous expansion of accidents.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic flow chart of a pump tripping logic control method of a nuclear power plant CPR1000 unit according to an embodiment of the present invention;

fig. 2 is a control logic diagram of pump tripping logic control of an electric feed water pump in the nuclear power plant DCS control system according to an embodiment of the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

In order to solve the problem that the pump tripping control logic of the conventional electric water-feeding pump cannot meet the water feeding requirement of a secondary loop when the set runs at full power, the invention provides the pump tripping logic control method of the electric water-feeding pump of the CPR1000 set of the nuclear power plant, so that when the output of the electric main water-feeding pump is insufficient, a standby pump can be immediately started, the water feeding disturbance of the secondary loop is reduced, and accidents such as primary loop overpower or forced set electric power descent and the like are avoided.

Specifically, referring to fig. 1, a schematic flow chart of an alternative embodiment of the logic control method for the pump tripping of the electric feed water pump of the CPR1000 unit in the nuclear power plant provided by the present invention is shown.

As shown in fig. 1, the method for logically controlling the pump tripping of the electric feed water pump of the CPR1000 unit in the nuclear power plant comprises the following steps:

and S101, monitoring electric power signals of the nuclear power unit in real time, and acquiring the total electric power of the unit.

And S102, monitoring the running state of the electric main water-feeding pump in real time, and acquiring the running state information of the electric main water-feeding pump.

In some embodiments, the operational status information of the electric main feedwater pump includes: the system comprises an operation signal of the electric main water feed pump, an outlet pressure signal of the electric main water feed pump, a rotating speed control mode of the electric main water feed pump, an actual rotating speed signal of the electric main water feed pump and a rotating speed set value signal output by a rotating speed adjusting loop of the pump.

And step S103, judging whether the condition for starting the standby pump is met or not according to the total electric power of the unit and the running state information of the electric main water-feeding pump.

And step S104, if yes, controlling the standby pump to start.

And step S105, if not, keeping the standby pump in a hot standby state.

In some embodiments, determining whether the starting standby pump condition is met according to the total unit electric power and the running state information of the electric main water-feeding pump comprises: acquiring total electric power of a unit, an operation signal of an electric main water supply pump, an outlet pressure signal of the electric main water supply pump, a rotating speed control mode of the electric main water supply pump, an actual rotating speed signal of the electric main water supply pump and a rotating speed set value signal output by a rotating speed adjusting loop of the pump; and judging whether the conditions for starting the standby pump are met or not according to the total electric power of the unit, the operation signal of the electric main water feed pump, the outlet pressure signal of the electric main water feed pump, the rotating speed control mode of the electric main water feed pump and the deviation value of the actual rotating speed signal and the rotating speed set value signal of the electric main water feed pump.

In some embodiments, the determining whether the condition for starting the backup pump is satisfied according to the total electric power of the unit, the operation signal of the electric main water-feeding pump, the outlet pressure signal of the electric main water-feeding pump, the rotation speed control mode of the electric main water-feeding pump, and the deviation value of the actual rotation speed signal of the electric main water-feeding pump and the rotation speed set value signal comprises: judging whether the electric main water feed pump is in an operating state or not according to an operating signal of the electric main water feed pump; judging whether the total electric power of the unit is greater than a power threshold value; judging whether an outlet pressure signal of the electric main water supply pump is greater than an outlet pressure threshold value or not; judging whether the rotation speed control mode of the electric main water feeding pump is automatic control or not; judging whether the deviation of the actual rotating speed of the electric main water feeding pump and a rotating speed set value is larger than a deviation threshold value or not; and if the electric main water-feeding pump is in an operating state, the total electric power of the unit is greater than a power threshold, an outlet pressure signal of the electric main water-feeding pump is greater than an outlet pressure threshold, the rotating speed control mode of the electric main water-feeding pump is automatic control, and the deviation between the actual rotating speed of the electric main water-feeding pump and a rotating speed set value is greater than a deviation threshold, judging that the condition for starting the standby pump is met.

Further, in some embodiments, if it is determined that the electric main water-feeding pump is in an operating state, the total electric power of the unit is greater than a power threshold, an outlet pressure signal of the electric main water-feeding pump is greater than an outlet pressure threshold, a rotation speed control mode of the electric main water-feeding pump is automatic control, and a deviation between an actual rotation speed signal of the electric main water-feeding pump and a rotation speed set value signal is greater than a deviation threshold, delaying a preset time period; after a preset time period is reached, continuously judging whether the electric main water-feeding pump is in a running state, judging whether the total electric power of the unit is greater than a power threshold value, judging whether the pump outlet pressure of the electric main water-feeding pump is greater than an outlet pressure threshold value, judging whether the rotating speed control mode of the electric main water-feeding pump is automatic control, and judging whether the deviation of an actual rotating speed signal of the electric main water-feeding pump and a rotating speed set value signal is greater than a deviation threshold value; and if the electric main water-feeding pump is in an operating state, the total electric power of the unit is greater than a power threshold, an outlet pressure signal of the electric main water-feeding pump is greater than an outlet pressure threshold, the rotating speed control mode of the electric main water-feeding pump is automatic control, and the deviation between the actual rotating speed signal of the electric main water-feeding pump and a rotating speed set value signal is greater than a deviation threshold, starting the standby pump.

Alternatively, the preset time period may be 5 s. It can be understood that by delaying the preset time period, interference and disturbance can be prevented, and false start of the backup pump due to signal fluctuation can be avoided.

In the embodiment of the present invention, optionally, the power threshold is 55%; the outlet pressure threshold was 73 bar.g; the deviation threshold is: at 250 rpm.

In the embodiment of the invention, each unit is provided with 2 electric main water-feeding pumps and 1 standby pump, wherein when the electric power of the nuclear power unit is less than 55%, even if one pump tripping fault of the 2 electric main water-feeding pumps is abnormal, the other electric main water-feeding pump can meet the operation requirement of the electromechanical unit, so that when the electric power of the nuclear power unit is less than 55%, the standby pump does not need to be started.

The scoop tube falls down 7% in the twinkling of an eye under the different power platforms of unit and corresponds the pump speed and reduces about 250rpm, and the influence to feedwater regulation and steam generator water level can be in control range, and each platform can not jump the heap. When the instant fall of the scoop tube is more than 7%, if an operator does not intervene or intervenes untimely, the water level of the steam generator cannot be adjusted to a stable state, and finally the risk of pile jumping is caused. The maximum deviation of the actual rotating speed and the set value during the normal operation of the electric water-feeding pump is about 81rpm, so that the selection mode of the deviation threshold value of the set value and the actual rotating speed is increased by 2 times of margin on the basis of the operation experience value, and the signal false triggering during the normal operation is avoided. Therefore, the embodiment of the invention sets the deviation threshold value to 250rpm, and can avoid signal false triggering during normal operation.

Further, in some embodiments, an electric main pump abnormality signal is output when the backup pump is activated. Optionally, the abnormal signal may be implemented by means of picture display and alarm reminding.

The embodiment of the invention comprises the following steps before monitoring the electric power of the nuclear power unit in real time and acquiring the total electric power of the unit: acquiring a rotating speed control mode of a nuclear power unit; judging whether the nuclear power unit is in an automatic control mode or not according to a rotating speed control mode; and if so, carrying out real-time monitoring on the electric power of the nuclear power unit and acquiring the total electric power of the unit. It can be understood that the method for logically controlling the pump tripping of the electric feed pump of the nuclear power plant CPR1000 unit according to the embodiment of the invention is performed in the automatic control mode of the rotation speed control of the nuclear power plant unit.

In the embodiment of the present invention, the operation states of the 2 electric main water-feeding pumps are individually monitored and individually determined, that is, when the pump outlet pressure of any one (the #1 electric main water-feeding pump) of the 2 electric main water-feeding pumps (the #1 electric main water-feeding pump and the #2 electric main water-feeding pump) is greater than the outlet pressure threshold value, and the deviation between the actual rotation speed and the set rotation speed is greater than the deviation threshold value, the backup pump is immediately started, and the related information of the #1 electric main water-feeding pump and the corresponding alarm signal are output.

Referring to fig. 2, a control logic block of an alternative embodiment of the nuclear power plant DCS control system provided by the present invention is shown.

The method for controlling the pump tripping logic of the electric feed water pump of the nuclear power plant CPR1000 unit can be realized based on the control logic shown in FIG. 2.

Specifically, as shown in fig. 2, the nuclear power plant DCS control system includes: the monitoring system comprises a first monitoring module 11, a second monitoring module 12, a third monitoring module 13, a fourth monitoring module 14 and a logic control module 15.

The logic control module 15 is respectively connected with the first monitoring module 11, the second monitoring module 12, the third monitoring module 13, the fourth monitoring module 14 and the standby pump.

The first monitoring module 11 is configured to monitor an electric power signal of a nuclear power generating unit in real time to obtain a total electric power of the unit, and perform power judgment according to the total electric power of the unit.

The second monitoring module 12 is configured to monitor the operation state of the electric main water-feeding pump in real time to obtain operation state information of the electric main water-feeding pump, and determine the operation state of the electric main water-feeding pump according to the operation state information.

The third monitoring module 13 is configured to monitor an outlet pressure signal of the electric main water feed pump in real time to obtain a pump outlet pressure of the electric main water feed pump, and determine according to the outlet pressure signal of the electric main water feed pump.

The fourth monitoring module 14 is configured to determine a rotation speed control manner of the electric main water-feeding pump, monitor the actual rotation speed in real time to obtain an actual rotation speed signal of the electric main water-feeding pump, and compare and determine a rotation speed set value calculated by the electric main water-feeding pump regulation loop with the actual rotation speed signal of the electric main water-feeding pump.

The logic control module 15 is configured to control the backup pump to start or maintain the backup pump in a hot standby state according to the determination result of the first monitoring module 11, the determination result of the second monitoring module 12, the determination result of the third monitoring module 13, and the determination result of the fourth monitoring module 14. Optionally, in this embodiment of the present invention, the logic control module 15 may be an and gate.

As shown in fig. 2, when the first monitoring module 11 outputs the following judgment result: the total electric rate of the unit is greater than 55%, and the judgment result output by the second monitoring module 12 is as follows: the #1 electric main water-feeding pump and the #2 electric main water-feeding pump are in an operation state, and the judgment result output by the third monitoring module 13 is as follows: the pump outlet pressure of the #1 electric main water feed pump (or #2 electric main water feed pump) is less than 73bar. g, and the judgment result output by the fourth monitoring module 14 is as follows: if the deviation between the actual rotating speed and the set rotating speed of the #1 electric main water-feeding pump (or the #2 electric main water-feeding pump) in the automatic mode is more than 250rpm, the standby pump is started immediately after the delay time of 5s and is still in the current state, and meanwhile, a corresponding alarm signal is output.

When any one of the judgment result output by the first monitoring module 11, the judgment result output by the second monitoring module 12, the judgment result output by the third monitoring module 13 and the judgment result output by the fourth monitoring module 14 is not satisfied (the total electric power of the unit is less than 55%, or the electric main water-feeding pump is in a stop state, or the pump outlet pressure of the electric main water-feeding pump is greater than 73bar.g, or the deviation between the actual rotating speed of the electric main water-feeding pump and the set rotating speed is less than 250rpm), the standby pump is not started, and the standby pump is still in a hot standby state.

It can be understood that, in the embodiment of the present invention, when the total electric power of the unit is greater than 55%, the electric water-feeding pump operates and the rotation speed control mode is the automatic control mode, the deviation between the actual rotation speed and the set rotation speed is greater than 250rpm, and the pump outlet pressure is less than 73bar.g, the backup pump is directly started, and the electric main water-feeding pump still keeps operating, at this time, the three electric water-feeding pumps are all in the operating state, and the operating mode does not generate any disturbance to the unit. The method provided by the embodiment of the invention can be used for judging whether the water supply capacity of the two-loop electric main water supply pump to the steam generator meets the design requirement or not earlier, can effectively prevent the primary loop from operating in an overpower manner due to the fact that the two-loop water supply does not meet the requirement, and has no influence on the operation of the unit when the system parameters are abnormal and the backup pump is started earlier.

By adopting the logical control method for the electric feed pump tripping of the nuclear power plant CPR1000 unit, provided by the embodiment of the invention, if the APA pump rotating speed control loop in operation generates abnormal disturbance when the unit is in normal operation, the standby APA pump can be automatically started in time, the water supply of the two loops is not influenced, and the hidden danger of the overpower and even the tripping of the primary loop possibly caused by the abnormal water supply of the two loops is eliminated.

In addition, by adopting the control logic of the embodiment of the invention, the backup pump can be automatically and preferentially started when the water feeding pump of the two loops is abnormal, and even if the two loops are disturbed, the backup pump can be started in time, more time for an operator to take intervention measures can be won, and the accident expansion is avoided.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.