JP2594976B2 - Function hierarchy configuration output control system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a function hierarchy configuration output control system, and more particularly to a function hierarchy configuration output control system suitable for application to a nuclear power plant.

[Conventional technology]

In recent years, as the specific gravity of the nuclear power plant in the power system has increased, it has been used to perform output adjustment operations such as load following operation, automatic frequency control operation, and governor-free operation without leaving the nuclear power plant at base load operation. The need to do so has grown. Further, from the viewpoint of improving the power generation efficiency of the nuclear power plant and reducing the burden on the operators, there is a need to automatically perform the output control for the start, stop, and constant output operation of the plant.

By the way, if the power control is automatically performed over a high range in a nuclear power plant, the related control devices are diversified, and the control process amount and the process amount that needs to be monitored when performing the control are large. Will be extended. For example, in a boiling water nuclear power plant, as a control device related to power control, a control rod control device that inserts and removes a control rod, which is a neutron absorbing material, into a core to change a core thermal output, a core flow rate having a neutron flux deceleration function There is a recirculation flow control device that changes the core thermal output by changing the density by changing the steam flow, and a turbine control device that changes the generator output by changing the steam flow that drives the turbine.

Conventionally, when performing predetermined output control by associating them, it has been considered to install an output adjustment device that supervises them and is positioned at the top. It is important that the boiling water reactor monitor various process quantities related to the core operating area and power in order to maintain the integrity of nuclear fuel and various equipment, and make sure that these are within specified limits. You need to consider driving. To solve these problems, the following two methods have been considered.

(1) One method uses a process amount to be monitored as a control process amount as a feedback signal to directly control the monitored process amount in a predetermined manner. For example, the neutron flux feedback system in the recirculation flow control system corresponds to this.

(2) Another method is to perform a predictive calculation in an output adjusting device in advance so that a parameter to be monitored does not exceed a predetermined limit value as disclosed in Japanese Patent Application Laid-Open No. 61-165690. And an output setting pattern (operation pattern).

[Problems to be solved by the invention]

 Problems with the prior art are described below.

In the method of feeding back the monitoring process volume,
When the output control extends over a high range, the amount of process to be monitored becomes large, and the amount of important monitored process varies depending on the control mode, so that the control algorithm may be complicated. Further, in the method disclosed in Japanese Patent Application Laid-Open No. 61-165690, the output setting pattern is determined based on the result of the prediction calculation before executing the control.
There is an inaccuracy associated with the prediction accuracy, and it is expected that the control range will be limited and detailed monitoring will not be performed by incorporating it into the initial setting pattern.

An object of the present invention is to provide a function hierarchy configuration output control system in which control is efficiently performed within a predetermined operation limit range for all output control modes, and the configuration is simple and scalable. It is in.

[Means for solving the problem]

The above object is to provide a control rod control device for controlling the output of a nuclear reactor plant, a recirculation flow control device and a control device in which a turbine control device is hierarchized, a control allowable amount monitoring setting device and a protection block device. A general control device that supervises the control means of each of the control devices, a general control allowance monitoring and setting device that supervises the control allowance monitoring and setting device of each of the control devices, and This can be attained by providing a general protection block device for controlling the protection block means.

[Action]

Each of the control rod control device, the recirculation flow control device and the turbine control device is provided with a hierarchized control means, a control allowance monitoring setting means and a protection block means.
The control, the setting of the allowable control amount, and the protection of the plant can be performed simultaneously and independently and functionally while interpolating each other. For this reason, efficient control can be quickly performed while maintaining the predetermined operation restriction range.

An output control system for a nuclear power plant according to a preferred embodiment of the present invention will be described below with reference to FIG.

Here, an example in which the present invention is applied to a boiling water nuclear power plant is shown. As control devices related to output control, a control rod control device 6, a recirculation flow control device 7, and a turbine control device 8 are provided. The control unit 6 includes a control unit 6A, a control allowable amount monitoring / setting unit 6B, and a protection block unit 6C, which are hierarchized. The control unit 7 also includes a hierarchical control unit 7A, a control allowable amount monitoring / setting unit. 7B and a protection block means 7C. The control device 8 also has a control means 8A, a control allowable amount monitoring and setting means 8B and a protection block means 8C in a hierarchical structure. Further, a general control device 3 for systematically controlling the control means 6A, 7A and 8A, a general control allowance monitoring and setting device 4 for controlling the control capacity monitoring setting means 6B, 7B and 8B, and protection block means 6C, 7C and 8C. Is provided with an overall protection block device 5 for supervising. What is important here is that each hierarchical section is systematically classified into functions, and the supervising devices 3 to 5 may be installed when necessary in an actual configuration. Each hierarchical unit is communicated (or directly) with the central power supply command center 1, the process computer 2, and a plant or the like (not shown in FIG. 1) via the above-mentioned control devices 3 to 5. 20 is an operator. Control means 6
A, 7A and 8A are arranged above the control devices 6, 7 and 8,
A control mode and a control process amount are selected based on a command from the general control device 3, and a control pattern set by the command from the general control device 3 is compared with the control pattern to calculate a corresponding control device 6. , 7 and 8 are calculated. The control allowable amount monitoring and setting means 6B, 7B and 8B are arranged at the operation amount setting portions of the control devices 6, 7 and 8, and the boiling required to be monitored at the time of control in each control device (6, 7 and 8). The monitoring process amount of the water nuclear power plant (for example, core operating area, reactor cycle, reactor water temperature change rate, neutron flux rise rate, neutron flux distribution, thermal limit value of fuel, etc.) and the predetermined limit value for each The operation amount and the operation amount change rate allowed by the corresponding control device are calculated and set from the allowance. Therefore, the manipulated variables calculated by the control means 6A, 7A, and 8A correspond to the corresponding control allowance monitoring setting means 6B, 7B, and 8B.
Will be limited. Protection block means 6C, 7C and 8
C is disposed at the output end of the corresponding control device 6, 7, and 8, and monitors the nuclear power plant or the core separately from the above-mentioned control allowable amount monitoring and setting means 6B, 7B, and 8B. These protection block means perform the protection operation of the output block and the operation end trip, etc., when necessary, by a function which is separated and independent from the control device in terms of structure.

Next, how the present embodiment operates will be described. The overall control device 3 is controlled by the central power supply command center 1, the operator 20 and the process computer 2 to output control mode, (start, stop, daily load compliance, automatic frequency control, governor free, constant output) and target Select output and output pattern. The overall control device 3 controls each of the control devices 6 to 8 in a control mode (automatic, constant) according to the selected output control mode.
Command the selection of control process amount (furnace cycle, reactor water temperature, output, manipulated variable) and set pattern (target value, time, cycle). The control means 6A, 7A and 8A of the control devices 6 to 8 execute the control calculation in accordance with the command output from the general control device 3 and operate the operation amounts (control rod movement amount, recirculation pump speed change amount,
The amount of change in the steam control valve opening is calculated. On the other hand, the control allowance monitoring setting means 6B, 7B, 8A controls the process amount (core operating area) of the nuclear power plant which needs to be monitored at the time of control by the corresponding control device or the general control allowance monitoring setting device 4. , Reactor cycle, reactor water temperature change rate, neutron flux rise rate, neutron flux distribution, fuel thermal limit value, etc.) and the predetermined limit value, and calculate the allowable operation amount and the operation amount change rate. , These manipulated variables and the rate of change of manipulated variables and the aforementioned control means 6A, 7A
And the operation amount calculated in the section 8A. If the operation amount calculated by the control means exceeds the allowable amount, the operation amount is limited and output by the corresponding control allowable amount monitoring and setting means. As a result, the above-mentioned monitoring parameter does not exceed the limit value, and the nuclear power plant is automatically controlled to the target output or output pattern within the predetermined operation limit range. Also, in the event that a failure or the like occurs in the control device and the above functions cannot be performed, and there is a possibility that a problem with the plant and core soundness may occur, the output terminal of each control device may be used. The protection operation such as the output block and the operation end trip is performed by the protection block means disposed in the above, so that the soundness of the plant and the core is not impaired.

The concept of the present embodiment has been described above, and will be described more specifically with reference to FIG.

Reference numerals 1 to 8 in FIG. 2 denote the function hierarchical configuration output control system shown in FIG. In the boiling water nuclear power plant, the steam generated in the nuclear power 9 is guided to the turbine 14 via the steam control valve 16, and the generator 15 is generated by the rotation of the turbine 14. Output control in such a boiling water nuclear power plant is performed by the control rod control device 6, the recirculation flow control device 7, and the turbine control device 8. The control rod control device 6 controls the control rod 11 which is a neutron absorbing material in the core.
The control rod drive device 12 that changes the reactor power by inserting or removing the control rod drive device 12 is controlled. The recirculation flow controller 7 controls the recirculation pump power supply 13. The recirculation pump power supply device 13 adjusts the rotation speed of the recirculation pump 10 that adjusts the core flow rate having a neutron flux deceleration function. Such a change in the core flow changes the density, thereby changing the reactor power. The steam control valve 16 that changes the generator output by changing the steam flow that drives the turbine 14 is controlled by the turbine controller 8. In FIG. 2, the configuration of the portion surrounded by the one-dot chain line is the first configuration.
In the figure, the configuration is the same as that of the portion surrounded by the dashed line.

Since the outline of the operation of this embodiment has already been described, the operation of this embodiment for various output control modes will now be specifically described. As described above, the selection of the output control mode, the target output, and the output pattern described below are determined by the central control device 3 according to commands or operations from the central power supply command station 1, the operator, and the process computer 2. You.

(1) Reactor start-up a) Critical proximity The control rod controller 6 selects an automatic mode, a reactor cycle as a control process amount according to a command signal output from the overall controller 3, and the recirculation flow controller 7 is constant. Mode, and the turbine controller 8 selects the pressure control mode.
In the control allowable amount monitoring and setting means, the furnace cycle and the like are monitored as important process amounts. Thus, the operation amount of the control rod 11 is calculated so as to have the set furnace cycle, and the allowable operation amount is similarly calculated from the margin between the furnace cycle and the limit value to limit the control rod operation amount.

b) Pressure rise Based on the command signal output from the general controller 3, the control rod controller 6 selects the automatic mode, the core temperature change rate as the control process amount, and the recirculation flow controller 7 selects the constant mode. In the turbine control device 8, the pressure control mode is selected. In the control allowance monitoring setting means,
Reactor water temperature change rate, neutron flux distribution, thermal limitation of fuel, etc. are monitored as important process quantities. As a result, the operation amount of the control rod 11 is calculated so as to become the set reactor water temperature rise rate, and the allowable operation amount is calculated from the tolerance between the monitoring process amount and the limit value, and the control rod operation amount is calculated. Restrict.

c) Output rise Control rod controller 6 according to a command from general controller 3
In the automatic mode, the output is selected as the control process amount. In the recirculation flow control device 7, a constant mode is selected. In the control rod control device 6, a constant mode is selected.
In the recirculation flow controller 7, the output may be selected as the automatic mode and the control process amount in some cases. In either case, the turbine controller 8 selects the pressure / load mode. The control allowable amount monitoring and setting means monitors the core operation region, the neutron flux rising rate, the neutron flux distribution, the thermal limit value of the fuel, and the like as important process quantities. As a result, control of the control rod 11 and control of the recirculation pump 10 are alternately performed to reach a predetermined target output. During this time, the operation amount of the control rod operation amount and the operation amount of the recirculation pump are limited in accordance with the tolerance between the above-mentioned monitoring process amount and the limit value. If the monitoring process amount exceeds the monitoring limit value and reaches a separately specified protection limit value due to some failure or the like, the protection block means operates the control rod 11 or blocks the recirculation pump 10. Perform some trips to maintain the integrity of the plant and core.

(2) Load following operation In response to a command signal from the overall control device 3, a load following mode operation and a superimposed operation thereof can be performed as described below. In any case, the control allowable amount monitoring and setting means uses the core operation area,
The neutron flux rising rate, the neutron flux distribution, the thermal limit value of the fuel, and the like are monitored as important process amounts, and the allowable operation amounts of the respective control devices are calculated according to the margin with the limit values, and the operation amount is limited. . Also in this case, as in the case described above, monitoring and protection of the plant and core soundness are performed in the protection block.

a) Daily load follow-up A control rod operation amount is directly set in the control rod control device 6 by a command signal from the general control device 3, and an output is selected as an automatic mode and a control process amount in the recirculation flow control device 7. You. FIG. 3 shows how each process amount and output change at this time. After the output is changed, a change in the concentration of the neutron absorbing substance Zenon 135 occurs, but the output is kept constant by the recirculation flow rate control. The operation examples of the control allowable amount monitoring setting unit and the protection block means at this time will be described below with reference to FIGS. 4 to 6. FIG. 4 shows the relationship between the reactor power and the core flow rate, but shows the core operating region. The control allowable amount monitoring and setting unit divides the core operation region into three regions (a) to (c). FIG. 5 is an example of a block diagram of each control device. An output and an output setting pattern are compared and calculated by a control computing unit 17 as a control means, and an operation amount is calculated. Signal limiter 1
8. The operation amount is limited by the change rate limiter 19. By changing the settings of the signal limiter 18 and the change rate limiter 19 in accordance with the above-described operating ranges A to C, the closer the operating range is to the limit value, the more the tolerance of the control allowable amount becomes. It is getting smaller. FIG. 6 shows the operation of the recirculation flow rate control. By monitoring the core operating region and setting the control allowance, it can be seen that the reactor responds promptly without exceeding the limit value. In FIG. 4, the dashed line 2 is a setting provided from the viewpoint of maintaining the integrity of the core. If the setting is exceeded, the protection block means protects the control rod block and a part of the recirculation pump trip. Is performed.

b) Automatic frequency control According to a command from the central power supply command center 1, the central control device 3
Commands the recirculation flow control device 7 to select an output as an automatic mode and a control process amount, and gives an output setting pattern. Thereby, the automatic frequency control operation by the recirculation flow rate control is performed.

c) Governor-free The general control device 3 instructs the turbine control device 8 to select a governor-free mode. Accordingly, the turbine control device 8 controls the turbine speed, and
An output change request is output to the recirculation flow controller 7.

(A description of the constant output operation and the stop mode is omitted.) As described above, according to the present embodiment, for all the modes of the output control, the predetermined operation restriction range is maintained, and prompt control is performed. Can be performed.

〔The invention's effect〕

According to the function hierarchical configuration output control system of the present invention,
For all power control modes, setting of allowable control amount by monitoring the control / monitoring process amount of each power control unit, and protecting the soundness of the plant and core simultaneously and efficiently while interpolating independently and functionally Since it can be performed, there is an effect that a predetermined operation restriction range can be maintained and quick control can be performed. Also, this output control system
Since the configuration is separated for each function, there is an effect that the configuration is simple and that there is much expandability.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a function hierarchical configuration output control system according to an embodiment of the present invention, FIG. 2 is a configuration diagram showing an example in which the control system of FIG. 1 is applied to a boiling water nuclear power plant,
FIG. 3 is a characteristic diagram of the daily load following operation in FIG.
FIG. 5 is an explanatory diagram showing a core operation region, FIG. 5 is a block diagram of a control device in the embodiment of FIG. 2, and FIG. 6 is a characteristic diagram of an output increase by recirculation flow control in the embodiment of FIG. is there. DESCRIPTION OF SYMBOLS 1 ... Central power supply dispatching station, 2 ... Process computer, 3 ... Overall control device, 4 ... Overall control allowable amount monitoring and setting device, 5 ... Overall protection block device, 6 ... Control rod control device, 7 ... Recirculation flow control device, 8 Turbine controller, 9 Reactor, 10 Recirculation pump, 11 Control rod, 12 Control rod drive, 13 Recirculation pump power supply, 14 Turbine, 15 Generator, 16
Steam control valve, 17 ... Control calculator, 18 ... Signal limiter, 19 ... Change rate limiter.

Claims (4)

(57) [Claims] 1. A control rod control device, a recirculation flow control device, and a turbine control device for controlling the output of a nuclear reactor plant, wherein each of the control devices is hierarchized control means, and a control allowable amount monitoring and setting means. And a protection block unit, and a general control unit for supervising the control unit of each of the control units, and a general control allowance monitoring unit for supervising the control allowance monitoring setting unit of each of the control units. A functional hierarchy configuration output control system, comprising: a setting device; and a general protection block device that supervises the protection block means of each of the control devices. 2. The control means is arranged above each of the control devices, and performs a comparison operation between the control process amount and the control pattern based on a selected control mode, a control process amount, and a set control pattern. An operation amount is calculated, and the control allowable amount monitoring and setting means is provided at an operation amount setting portion of each of the control devices, and when performing control, a margin between a process amount to be monitored and a predetermined limit value. The operation amount is limited by setting the allowable operation amount of each control device operation amount, and the protection block means is provided at the output end of each of the control devices, and when necessary by plant or core monitoring. 2. A function hierarchy configuration output control system according to claim 1, wherein an operation of an output block, an operation end trip, and the like is performed by a function which is configured and separated and independent from the control device. 3. The control means grasps output control modes such as start, stop, daily load follow-up / automatic frequency control, governor-free, and constant output by a command signal from an operator, a process computer or a central power supply command station. 3. The function hierarchy configuration output control system according to claim 2, wherein a control mode, a control process amount, and a control pattern are set for each of said control devices. 4. The control permissible amount monitoring means includes a monitoring process amount such as a core operation area, a reactor cycle, a reactor water temperature change rate, a neutron flux rising rate, a neutron flux distribution, and a fuel thermal limit value, and a predetermined process quantity for each. 3. The function hierarchy configuration output control system according to claim 2, wherein an operation amount and an operation amount change rate allowed for each of said control devices are calculated and set from a margin with respect to the limit value.