JPH0491303A - Turbine controller - Google Patents

Abstract

PURPOSE:To eliminate need of operation for increasing a pressure set value by an operator even when a reactor pressure is raised in starting of a nuclear reactor by adding a bias to a deviation between the pressure set value and an actual pressure, and automatically bringing the pressure set value to a value higher than the actual pressure. CONSTITUTION:In normal operation, input of a pressure set deviation signal into an adder 20 is interrupted by a follow-up mode switch 21, and a pressure set value is operated only by a pressure setting increase manipulator 11 or a pressure setting decrease manipulator 12. And at a rise of reactor pressure in starting of a nuclear reactor, pressure setting follow-up is operated by connecting a contact point 19 by using a follow-up mode switch 21. At this time, a pressure setter 8 has an integrating function, and as for input of a signal in the positive polarity, for example, an output is increased. That is, when the contact point 19 is made connected, the pressure set value is follow-up controlled to a value higher than an actual pressure by a biasamount. By this, opening of a BPV at the reactor pressure rise in starting of the nuclear reactor is cancelled.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a turbine control device for an atomic couplant.

(Prior art) An example of a turbine steam system in an atomic coupler is shown in the third example.
As shown in the figure.

In FIG. 3, steam generated in a nuclear reactor 1 flows into a turbine 4 through a main steam stop valve (hereinafter referred to as MSV) 2 and a steam pipe control valve (hereinafter referred to as Cv) 3, and then flows into a condenser 5.
The water is condensed.

Further, some of the steam passes through a turbine bypass valve (hereinafter referred to as BPV) 6 from before the MSV 2, bypasses the turbine 4, and flows into the condenser 5.

Normally, MSV2 is fully open, and the turbine speed and turbine inlet steam pressure are controlled by adjusting the valve openings of CV3 and BPV6, and a pressure detector 7 is installed in front of MSV2 to control the latter turbine inlet steam pressure. It is provided.

In addition, in the new type of reactor, the reactor dome pressure is controlled by detecting the reactor dome pressure instead of the turbine inlet steam pressure.

A functional block diagram of a conventional turbine control device is shown in FIG.

In FIG. 3, the actual pressure V output from the pressure detector 7
6 is calculated by the adder 13 as a deviation from the pressure setting value -v5 output from the pressure setting device 8, and a pressure deviation signal V7 is obtained.
is obtained. The pressure deviation signal 7 is amplified by an amplifier 14 and output as a pressure control signal 7. Low value selector 15
What about this pressure control signal? e and a speed load control signal S for controlling the turbine rotational speed and output are input, and the one with the lower value of both signals is output as the CV flow rate command value -v9.

The adder 16 calculates the difference between the pressure control command VB and the CV flow rate command 9, and calculates the difference between the two (-v8-υ9) as B.
PV flow rate command. Bind and output.

CV3 and BPV6 are each based on this Cv flow rate command ㅅ8.
, BPV flow rate commandㅅ. The opening is adjusted and controlled according to the opening.

The above-mentioned pressure setting value t5 is set using the following pressure setting device 8.
obtained by the operation of The pressure setting device 8 has an integral operation function, and when the contact point 10 is made conductive by operating the pressure setting increaser 11 and a pressure control signal S with positive polarity is obtained as an input, the pressure setting value Z which is the output is obtained. 6 is continuously changed in the increasing direction. Further, when the contact 9 is connected by operating the pressure setting/decrementing device 12 and a pressure setting range signal 2 having a negative polarity is obtained as an input, the output pressure setting value ? ll is continuously changed in a decreasing direction. When there is no signal input to the pressure setting device 8, the output pressure setting value ヅ is held at a constant value.

When the reactor 1 is started up, that is, when the reactor pressure rises toward the reactor rated pressure, the CV3 is fully open, and the BPV6 adjusts the amount of steam led from the reactor 1 to the condenser 5 to maintain the reactor pressure. In the case of the above-mentioned turbine control device, this pressure control is performed as follows.

When the actual pressure 1)6 is higher than the pressure setting value -v5 which is the output of the pressure setting device 8, a positive polarity (+x%) pressure control signal S is obtained in accordance with the pressure deviation signal S. At reactor startup, the speed load control command is held at 0%, and the C■ flow rate command is, in this case, a +X% pressure control signal, a 0% speed control signal, The lower value of 0% is output by the low value selector 15. In addition, the pressure control command -
As a result of the deviation calculation between v8 and C■ liquid flow rate command 1Jg, +
A value of x% is obtained and BPV6 is controlled in the open direction.

If the actual pressure is lower than the pressure setting value output from the pressure setting device 8, the negative polarity (
-y%) pressure control signal VII is obtained. In this case, the flow rate command C■ is compared with the speed load control command V□, which is a value of 0%, and the pressure control command V, which is -y%, as described above, and the lower value, 1y%, is It is output from the low value selector 15. BPv flow rate command. Adder 1 that calculates
The CV flow rate command input to 6 is input after being limited to a value from -y% to 0% by a lower limiter 17 having a lower limit setting of 0%, and the adder 16 inputs a value on the pressure side of -y%. The deviation calculation was performed using the control signal tll and this 0% value.
% to BPV flow rate commandㅅ. Bind and output. In addition, CV
Both CV3 and BPV6 are fully open when the flow rate command is 0% or less, and in this case, both CV3 and BPV6 are fully closed.

As mentioned above, when starting the reactor, CV3 is always fully open, and if the actual pressure TG is higher than the pressure set value V, BPV6 opens according to the deviation, and the pressure set value? Actual pressure bulkier than S,
is low, BPV6 is fully closed.

(Problems to be Solved by the Invention) When starting up a nuclear reactor, the reactor output is increased based on a certain pattern as shown in FIG. 5, and the reactor pressure is raised to the rated value. When the reactor pressure increases, there is no need to guide the reactor-generated steam to the turbine 4 and condenser 5, and control is performed so that the CV3 and BPV6 are fully closed.

In this case, as described above, the speed load control command 7j of 0%
, CV3 is kept fully closed, but for BP■6, the actual pressure v6, which fluctuates depending on the reactor pressure, is the pressure set value V.
When the value exceeds 5, the opening operation occurs. In order to prevent this BPVe opening operation, it is necessary to increase the pressure setting value V5 according to the actual pressure as shown in FIG. , it was necessary to operate the pressure setting intensifier 11 based on commands from other control devices.

The present invention provides turbine control with a function to automatically follow a pressure setting value slightly higher than the actual pressure in order to prevent the BPV opening operation due to the rise in reactor pressure at the time of reactor startup. The purpose is to provide equipment.

[Structure of the invention]

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a plurality of steam control valves that adjust the flow rate of steam guided from the nuclear reactor to the turbine, and a turbine that adjusts the flow rate of steam bypassing the turbine. A turbine control device that controls turbine inlet steam pressure or reactor dome pressure by controlling the opening degrees of both bypass valves includes a circuit that detects turbine inlet steam pressure or reactor dome pressure, and a circuit that detects the turbine inlet steam pressure or reactor dome pressure, and a circuit that detects the detected pressure signal. The present invention is characterized by comprising a bias circuit that adds values, and a circuit that follows and controls the set value of the pressure setting device using the signal after the bias value addition as a target value.

(Function) In the above configuration, when pressure control is performed so that the turbine inlet steam pressure or the reactor dome pressure becomes equal to the pressure setting value, the present invention calculates the deviation between the pressure setting value and the actual pressure, and calculates the deviation between the pressure setting value and the actual pressure. By applying a bias as shown in Figure 2, the pressure setting value is automatically brought to a value higher than the actual pressure. As a result, even when reactor pressure rises during reactor startup,
There is no need for the operator to increase the pressure setting value, and the operational burden can be greatly reduced.

(Example) An embodiment of the present invention is shown in FIG.

In FIG. 1, the same reference numerals as those in FIG. 4 indicate the same or corresponding parts.

In FIG. 1, an adder 18 calculates the deviation (#G-
ys), a bias sensor □□ is added to it, and a pressure setting signal V□2 is output. In adder 20, adder 1
The pressure setting signal V1□ which is the output of 8 and the pressure setting operation signal υ4 are added and the result of the addition is output to the pressure setting device 8. The contact 19 is turned on and off by operating the follow-up mode switch 21, and operates the input of the pressure setting deviation signals S and □ to the adder 20.

Next, the effect of the above configuration will be explained.

During normal operation, the follow-up mode switch 21 controls the adder 20.
The input of the pressure setting deviation signal □2 to the pressure setting deviation signal □2 is cut off, and the pressure setting value -v5 is operated only by the pressure setting increasing operation device 11 or □2 or the pressure setting decreasing operation.

Follow-up mode switch 2 when the reactor pressure increases during reactor startup
1, the following pressure setting follow-up operation is performed by turning on the contact 19.

As mentioned above, the pressure setting device 8 has an integral operation function, increases the output in response to a positive polarity signal input, decreases the output in response to a negative polarity signal input, and keeps the output constant when the input is O. An action is taken. Therefore, the obtained value (#s+Z'l□)
If the pressure setting value is lower than the pressure setting value, the pressure setting deviation signal is
□ becomes positive polarity, increase pressure setting value V5, pressure setting value? , , is high.

The pressure setting deviation signal υ,2 becomes negative polarity, and the pressure setting value t
Perform a subtraction operation of 5.

In this way, when the contacts 1 and 9 are conductive, the pressure set value V5 is always controlled to follow the actual pressure bulk and to a value higher by 1□ of the bias voltage.

In this way, it is possible to automatically control the pressure setting value to be higher than the actual pressure by operating the follow-up mode switch to prevent BP■ from opening when the reactor pressure increases at reactor startup. Become.

In addition, the present invention can obtain more desirable results by adding the following circuit.

In FIG. 1, the pressure set value S, which is the output of the pressure setting device 8, is made to follow the value obtained by adding the bias V11 to the actual pressure bulk, by operating the follow-up mode switch 21 at the contact 19.
It is started by turning on.

This follow-up mode switch 21 is provided with an operation prohibition circuit so that the contact 19 will not be brought into conduction when the operation is normally performed manually.

Examples of this follow-up prohibition condition include a turbine start signal, a BPV6 open signal, and the like.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible for the turbine control device to automatically increase the pressure set value in accordance with the rise in reactor pressure so that the BPV does not open when the reactor pressure rises during reactor startup. , the operational burden on the operator can be greatly reduced.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram showing one embodiment of the present invention;
3 is a system diagram showing the general configuration of a turbine, FIG. 4 is a functional block diagram of a conventional turbine control device, and FIG. 5 is a diagram showing a furnace pressure raising operation according to the present invention. FIG. 3 is a diagram showing a furnace pressure increasing operation by the turbine control device. 3... Steam control valve 4 - Turbine 6... Turbine bypass valve 9, 10.19... Contact 13, 16.18.20... Adder 15... Low value selector 17... Lower limit limiter 21...Following mode switch

Claims (2)

[Claims] (1) By controlling the opening degrees of both the multiple steam control valves that adjust the flow rate of steam led from the reactor to the turbine and the turbine bypass valve that adjusts the flow rate of steam bypassing the turbine, the turbine inlet steam pressure or the In a turbine control device that controls reactor dome pressure, a circuit that detects the turbine inlet steam pressure or reactor dome pressure;
A turbine control device comprising: a bias circuit that adds a constant value to the detected pressure signal; and a circuit that follows and controls a set value of a pressure setting device using the signal after adding the bias value as a target value. (2) It is characterized by having a switching circuit for turning on and off the automatic follow-up circuit for the pressure setting device setting value, and a circuit for forcibly disabling the switching circuit by a turbine start signal or a turbine bypass valve opening signal. The turbine control device according to claim 1.