JPS6212522B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that continuously controls a flow rate using an MG device and can smoothly switch between manual and automatic operation.

Flow rate control is generally performed by controlling the opening of a valve and controlling the number of revolutions (speed) of a pump motor. Recently, a method of controlling the rotation speed of a pump motor is often used for large-capacity flow control, and is applied to nuclear power plant recirculation systems, power plant water supply control systems, etc.

To control the rotation speed of the pump motor, use M-G.
There is a method using a fluid coupling provided in the device. As an example, a nuclear power plant recirculation flow control system will be described below. Since the reactor power varies in proportion to the recirculation flow rate, the nuclear power plant recirculation control system has the ability to adjust the recirculation flow rate by varying the speed of the recirculation pump. The speed of the recirculation pump is adjusted by a fluid coupling provided in the recirculation MG device.

This will be explained below using figures. FIG. 1 is a basic configuration diagram of a general recirculation flow rate control system implemented in nuclear power plants. In Fig. 1, MG device 12A
(A system) and 12B (B system) have the same configuration, and to simplify the explanation, the control operation of the MG device 12A will be mainly explained. The recirculation flow rate is controlled by changing the rotational speed of the pump motor 1A by changing the power frequency of the recirculation pump motor 1A, as shown in FIG. The power supply frequency is controlled by changing the speed of the variable frequency generator 2A.

The speed of the variable frequency generator 2A is controlled by adjusting the oil amount of the fluid coupling 3A provided between the generator drive electric motor 4A and the variable frequency generator 2A and changing the coupling force of the fluid coupling 3A. do. The oil amount in the fluid coupling 3A is determined by the recirculation pump speed request signal 4.
It can be changed by operating the scoop pipe controller 5A through 7a and changing the position of the fluid coupling scoop pipe (not particularly shown). Therefore, by adjusting the position of the scoop pipe and controlling the speed of the pump motor 1A, the recirculation pump 11A can be operated and the recirculation flow rate of the reactor 10 can be controlled.

The case where the recirculation flow rate control system is operated automatically, that is, the case where the manual/automatic switching devices 6A and 6B (hereinafter referred to as M/A switching devices) are set to the automatic A side and the main controller 7 is set to the automatic A side will be explained. . In this case, the main controller 7 receives a flow rate control command 8 from a plant computer or the like.
In response, the speed request command 30 is sent to the M/A switch 6A,
6B, via M/A switch 6A, 6B,
The recirculation pump speed request signal 47a is sent to the M-G device 1.
2A, 12B, and by controlling the scoop pipe position of the fluid coupling 3A, each recirculation M-G
Speed control of devices 12A and 12B is performed.

In addition, the main controller 7 is set to the manual M side, and the M/A switch 6 is set to the manual M side.
When A and 6B are set to the automatic side, the main controller 7 can manually control the recirculation MG devices 12A and 12B. Furthermore, when the M/A switch 6A, 6B is set to the manual M side, the recirculation M-G device 12A,
12B can be manually controlled by the respective M/A switchers 6A and 6B. However, when controlling the flow rate using this method, the operation becomes unstable within a certain range, making it impossible to control the flow rate with high precision.

FIG. 2 is a block diagram showing a conventional configuration for improving this point.
Speed request signal 30 from main controller 7 explained in the figure
When the recirculation M-G devices 12A, 12B enter the unstable region, the signal is converted to avoid the unstable region, and the M/A switch 6A, 6B is provided with speed request signals 30a, 30b, respectively. This is what I did.

FIG. 3 shows the operating characteristics of the unbalanced operation device 9, and when the speed request signal 30 is rising and falling at a constant rate, the speed request signal 30 is in the unstable region P1-
When the speed reaches the P2 period, add, for example, +α bias to the A system and -α bias to the B system to the speed request signal 30 to remove the signals given to the M/A switchers 6A and 6B shown in FIG. 2 from the unstable region. Signals 30a and 30b that enable stable operation are sent to M/A switchers 6A and 6B, respectively, and each recirculation M-G device 1
2A and 12B are operated stably and the recirculation flow rate is controlled. At this time, although the recirculation flow rates of the recirculation systems A and B are different, the total recirculation flow rate changes at the same rate as the speed request signal 30. Therefore, with this unbalanced operation device 9, it became possible to adjust the reactor output over a wide range, which had been limited in the past.
130876).

However, if a failure occurs in the unbalanced operation device 9, the operator should check the cause of the failure and
After carrying the manual signal to the automatic signal at the time of failure through manual operation, it was necessary to switch to manual and then manually adjust the reactor output using M/A switchers 6A and 6B. In other words, if an operator immediately switches from automatic to manual using the M/A switch 6A, 6B when the unbalanced operation device 9 fails, the signal will suddenly change to the manual signal position, and the recirculation flow rate and reactor output will be greatly affected. This is because fluctuations may eventually lead to a reactor scram. Therefore, it is necessary to switch from automatic to manual in a bumpless manner when the unbalanced operation device fails, and to continue stable operation as a system.

In view of the above, the present invention allows the output of the unbalanced operating device to always follow the manual setting value, and switches from automatic to manual without bumping when the unbalanced operating device fails, and when the unbalanced operating device fails, The present invention provides a device that can be operated by a main controller by bypassing an unbalanced operation device, and can be operated outside an unstable region using only the main controller.

FIG. 4 is a block diagram showing an embodiment of the present invention, and 9' is an unbalanced device 60A, 6 which is an unbalanced operating device 9 in FIG.
0B is a bumpless M/A switch which is a bumpless switch of the M/A switch 6A, 6B shown in FIG. When the unbalanced operation device 9' fails, the failure signal X is sent to the bumpless M/A switch 60A, 60B
and bumpless M/A switch 60A, 60
B is switched from automatic to manual,
The configuration is the same as that shown in FIG. 2 except for the unbalanced operation device 9' and the bumpless M/A switching devices 60A and 60B.

FIG. 5 is a block diagram showing in detail the structure of the unbalanced operating device 9' of FIG. 4. The general operation of the unbalanced operating device 9' is similar to that shown in FIGS. 2 and 3. That is, the speed request signal 30 sent from the main controller 7 enters the unbalanced operation device 9' and is sent to the setters 32a, 32b and the bias setting adders 31a, 31b.

The setting devices 32a and 32b receive the speed request signal 30, compare this speed request signal with a preset setting value, and constantly monitor whether or not the speed has entered an unstable region. . Setting device 3
2a and 32b operate at points P ₁ and P ₂ shown in FIG. In other words, the contact OPA of the setting device 32a is set to close at a speed of P ₂ or less, and the contact OPB of the setting device 32b is set to close at a speed of P ₁ or more.
are connected in series to excite the relay 37.

That is, when the speed request signal 30 enters the region between P ₁ and _{P 2} , the setting devices 32a and 32b operate, and the relay 37
energizes and closes bias contacts 37a and 37b,
The adders 31a and 31b add + to the A system and B system, respectively.
α bias − α bias signal is applied to the recirculation MG device 12 via inverters 33a and 33b.
A, 12B as speed request commands 30a, 30b. Therefore, although the speeds of the recirculation M-G devices 12A and 12B are different, the recirculation flow rate is determined by the speed request signal 3.
The amount is proportional to 0, and stable operation is possible.

The power supply device 36 of the unbalanced operation device 9' is connected to the relay 3
7 and adders 31a, 31b, etc. That is, the power supply device 36 converts the power input P to create and supply a power supply 35 for a relay drive power supply 34, an adder setting device, etc.

If these power supplies fail, no signal will be output from the unbalanced operating device 9'. In order to detect this, a failure signal X is generated by the relay power monitoring relay 27-1 and the adder setter power monitoring relay 27-2. The failure signal X is sent to the alarm output and bumpless M/A switching device 60A,
Sent to 0B. Monitoring relay 27-1, 27
-2 is constantly energized, and the contacts that turn on when power is lost are connected in parallel, and output is produced even if one of them fails.

Figure 6 shows bumpless M/A switching device 60A, 6.
0B is a detailed block diagram of 0B. Incidentally, in order to simplify the following explanation, the bumpless M/A switching device 6
0A will be explained.

In this circuit, when switching from manual to automatic or from automatic to manual, the output signals are mutually tracked during manual and automatic, and the switching is bumpless so that there is no shock when switching. Further, when the unbalanced operation device 9' fails during automatic operation, a failure signal X is received and the automatic to manual mode is switched from bumpless to manual.

The bumpless M/A switch 60A includes an M/A operator 40 that performs manual automatic switching and manual operation, a proportional delay unit (PDU) 42 that changes in a ramp shape in response to input step changes, and a proportional delay unit (PDU) 42 that changes in a ramp shape in response to input step changes. It consists of a manual unit (MU) 43 that constantly tracks signals from the PDU 42, and a logic unit (LU) 41 that performs amplification of manual and automatic switching signals.

When operating the bumpless M/A switch 60A in automatic mode, the M/A operating device 40 is set to automatic A. An automatic signal 44 is sent from the M/A operator 40 to a logic unit (LU) 41, and the automatic signal 44 amplified by the logic unit (LU) 41 is sent to a proportional delay unit (PDU)-4.
Sent to 2. By this automatic signal, the speed request 30a in automatic is converted into a signal 46 corresponding to the speed request signal 30a via the proportional delay unit 42, and the recirculation M-G device 12A
The speed request signal 47a is sent to the speed request signal 47a. Further, the speed request signal 47a is sent to the M/A operating device 40 and displayed on the M/A operating device 40 with an indicator.

In this way, when the bumpless M/A switch 60A is in the automatic mode, the output signal 46 of the proportional delay unit (PDU) 42 is always tracked by the manual unit 43 as the tracking signal 49, and the manual unit (MU) 43
Keep it in standby mode all the time. In this way, when the unbalanced operating device 9' is in the standby state, the unbalanced operation device 9' malfunctions, and a failure signal X is generated.
is output, the bumpless M/A switch 60A
The logic unit (LU) 41 receives the failure signal X of the unbalanced operation device 9', turns off the automatic output A of the logic unit (LU) 41, turns on the manual output, and sends the manual signal M to the manual unit (MU) 43. input, and the operation is performed using the set values of the manual unit 43. After that, manual speed setting changes can be made using the up and down setting buttons on the M/A controller 40.
40C400 generates an output signal 51, changes the settings of the manual unit (MU) 43, outputs a signal 47a containing the output signal 48 to the recirculation M-G device 12A, and also instructs the M/A operator 40. Let the meter fluctuate.

The manual unit (MU) 43 automatically connects to the proportional delay unit (PDU) 42.
Tracking signal 49 for automatic speed request signal 46
Since the signal is tracked by , it is possible to change the signal from automatic to manual without bumping. This also applies when the M/A operating device 40 is switched to manual mode.

In addition, a manual signal is always input as a tracking signal 50 from the manual unit MU43 to the proportional delay unit (PDU) 42, and when switching from manual to automatic, the switching with the automatic speed request signal 30a is changed in a ramp shape, The switch is made bumpless to avoid sudden changes in speed.

In this way, the unbalanced operation device 9' is used to avoid the unstable region of the recirculation M-G devices 12A and 12B.
Bumpless M/A switching devices 60A and 60B are provided to switch automatic manual switching to bumpless switching, and when an unbalanced operation device failure occurs, a failure signal X is sent to the bumpless M/A switching devices 60A and 60B.
, and can be switched from automatic to manual without bumping and can be operated using the M/A operating device 40.

As described above, the recirculation flow rate control system includes the unbalanced operation device 9' and the bumpless M/A switching devices 60A and 60A.
With 0B, it is possible to switch from automatic to manual in a bumpless manner in the event of a failure of the automatic operation or unbalanced operation device 9', allowing the operator to smoothly transition to manual operation, and making it possible for the recirculation flow rate control system to The automation of reactor power adjustment can be made more complete.

FIG. 7 is a block diagram showing another embodiment of the present invention, in which when the unbalanced operating device fails, the unbalanced operating device 9' is bypassed and the bumpless M/A switch is directly controlled by the main controller 7. 60A and 60B are controlled.

In other words, even if the unbalanced operation device fails, there are cases where it is necessary to control the recirculation flow rate with a single operation, such as when controlling outside the unstable region of 12A and 12B of the M-G device, so bypass operation is possible. It is something.

When the unbalanced operation device 9' fails, the bumpless M/A is activated as explained in Figs. 4, 5, and 6.
Switchers 60A and 60B are manually switched to bumpless mode. At this time, as shown in FIG. 7, the unbalanced operating device 9' is bypassed by the failure signal X of the unbalanced operating device 9'. Next, bumpless M/A switching device 60
Since A and 60B have been switched to manual mode, the switch S1 for resetting the unbalanced operating device failure signal X shown in FIG. 5 is turned off. switch S1
By turning off the bumpless M/
Logic unit 41 of A switch 60A, 60B
The manual command to is lifted. Then, when the operator switches the M/A operation device 40 to automatic mode,
Bumpless M/ directly from the main controller 7 shown in FIG.
Give a speed request signal to the A switching devices 60A and 60B,
The recirculation MG devices 12A and 12B can be controlled to adjust the recirculation flow rate and reactor power.

As described above, according to the present invention, recirculation flow rate control and reactor power adjustment can be performed automatically over a wide range by avoiding the unstable region of the M-G device, and in order to avoid the above-mentioned unstable region. When the unbalanced operation device installed in You can drive with.

The present invention makes it possible to easily perform extensive automation and manual operation as a backup thereof, and is useful for stable operation of nuclear power plants. Further, the present invention can be widely used not only as a recirculation flow rate control system but also as a flow rate control device using an MG device.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the basic configuration of a conventional recirculation control system, Figure 2 is a block diagram that also includes an unbalanced operating device, and Figure 3 is a characteristic diagram showing the operating characteristics of the unbalanced operating device. , FIG. 4 is a block diagram of a control system according to the present invention, FIG. 5 is a circuit diagram of an unbalanced operation device constituting the present invention, and FIG. 6 is a diagram of an M/A switch constituting the present invention. The block diagram in FIG. 7 is a block diagram of a control system according to another embodiment of the present invention. 1A... Recirculation pump motor, 2A... Variable frequency generator, 3A... Fluid coupling, 4A... Generator drive electric motor, 5A... Rake tube controller, 6A,
6B...M/A switch, 7...Main controller, 9,
9'... Unbalanced operating device, 10... Nuclear reactor, 11
A, 11B...Recirculation pump, 12A...Recirculation MG device A system, 12B...Recirculation MG device B
System, 32a, 32b... Setting device, 27-1, 27
-2...Power monitoring relay, S1...Reset switch, 31a, 31b...Adder, 33a, 33
b... Inverter, 36... Power supply, 34... Relay drive power setting device, inverter, adder power supply, 40... M/A operation device, 41... Logic unit, 42... Proportional delay unit, 43 ...Manual unit, 60A, 60
B...Bumpless M/A switch.

Claims (1)

[Claims] 1 A pump consisting of a pump that recirculates cooling water, a drive source that drives the pump, a fluid coupling that supplies the output of the drive source to the pump, and a controller that controls the amount of power transmitted by the fluid coupling. It has two control systems, A and B, and has a main controller that controls the total flow rate, and is controlled by the main controller, and is controlled by the main controller, while maintaining the total flow rate constant in the unstable region where the operation of the pump control device becomes unstable. and an unbalanced operation device that controls the controller to increase or decrease the flow rate of each of the pumps to achieve a flow rate that can be stably controlled, and a flow rate control that manually or automatically controls the recirculation flow rate of the reactor. The device includes a bumpless manual/automatic switch having means for causing the automatic control system to follow the manual control amount during manual control and for causing the manual control system to follow the automatic control amount during automatic control; means for detecting a failure of the operating device, when a failure of the unbalanced operating device is detected, manual operation is performed by the manual/automatic switch in the unstable region, and manual operation is performed by the manual/automatic switch outside the unstable region. A flow rate control device characterized in that the balance operation device is bypassed and the bumpless manual/automatic switch is directly controlled by the main controller.