KR102078193B1 - Control system for flow interruption test on nuclear power plant and method for controlling flow interruption test using the same - Google Patents

Abstract

In the flow control test control system of the original electric machine and the flow control test control method of the original electric machine using the same, the flow control test system for simulating the operating environment of the nuclear power plant, and includes a storage tank, a control valve, a test valve and a control unit. . The storage tank stores the fluid and provides the stored fluid at a first pressure. As the opening degree is controlled, the control valve discharges the fluid provided at the first pressure to the second pressure. The test valve is set to a pressure difference that is a difference between the second pressure upstream and the third pressure downstream, and is subject to a flow shutoff test. The control unit calculates the flow coefficient of the control valve and the opening degree of the control valve from the flow rate of the test valve, and further calculates the opening degree of the control valve through PID (proportional integral derivative control) control, Control the opening degree.

Description

CONTROL SYSTEM FOR FLOW INTERRUPTION TEST ON NUCLEAR POWER PLANT AND METHOD FOR CONTROLLING FLOW INTERRUPTION TEST USING THE SAME}

The present invention relates to a control system for a flow blocking test and a method for controlling a flow blocking test using the same. More specifically, the present invention relates to a nuclear power plant for performing performance evaluation of a valve used in a nuclear power plant by simulating conditions similar to those of a nuclear power plant. The present invention relates to a control system for a flow interruption test and a control valve for a flow interruption test of a raw machine using the same.

Performance evaluation is essential for nuclear power plants used in nuclear power plants. Especially, valves for nuclear power plants must be verified according to ASME QME-1. In the case of the flow blocking test by ASME QME-1, the maximum differential pressure set in actual operating conditions is The test is to be carried out with the valves actuated at both ends of the valve under test.

However, considering the actual operating conditions of the nuclear power plant, it is very important to maintain a large differential pressure across the valve, particularly when performing a valve test, that is, in the case of a flow shutoff test. Configuring the system is not easy.

In the related art, there has been a method in which the PID control method is used for the control at the reduced pressure while setting the pressure upstream of the valve to be larger than the maximum differential pressure required for the test and using the applied pressure at a reduced pressure.

However, when controlling the decompression using only the PID control, considering that the flow blocking test is performed in a very short time, there is a problem that it is difficult to maintain the differential pressure for a short time by the PID control alone. Since the opening and closing are repeated, the flow rate is so severe that there is a limit to control it only by PID control.

Furthermore, the gain used for PID control depends on the behavior characteristics of the system. Therefore, it is difficult to obtain the proportional gain, derivative gain, and integral gain multiplied by the error signal used for PID control in the flow blocking test. there is a problem.

In addition, in the flow-blocking test, the characteristics of the PID control must be changed according to the flow rate supply characteristics of the valve, and there is a problem that the simple control without consideration for this is inconsistent and the reproducibility is degraded.

As described above, in the simulation test of the conventional nuclear power valve, the application of only PID control has a limitation in simulating the actual nuclear power state.

Republic of Korea Patent No. 10-0909443

Therefore, the technical problem of the present invention has been conceived in this respect, the object of the present invention is to maintain the differential pressure more effectively, even in the flow-blocking test with a large flow rate change, effective compensation of the control error, and maintain consistency and reproducibility The present invention relates to a control system for flow interruption test of a source electric machine that can be improved.

In addition, another object of the present invention relates to a method for controlling the flow interruption test of the original electric machine using the control system for the flow interruption test of the original electric machine.

Flow control test control system according to an embodiment for realizing the object of the present invention to simulate the operating environment of a nuclear power plant, and includes a storage tank, a control valve, a test valve and a control unit. The storage tank stores the fluid and provides the stored fluid at a first pressure. As the opening degree is controlled, the control valve discharges the fluid provided at the first pressure to the second pressure. The test valve is set to a pressure difference that is a difference between the second pressure upstream and the third pressure downstream, and is subject to a flow shutoff test. The control unit calculates the flow coefficient of the control valve and the opening degree of the control valve from the flow rate of the test valve, and further calculates the opening degree of the control valve through PID (proportional integral derivative control) control, Control the opening degree.

In one embodiment, the controller may calculate the flow coefficient of the control valve on the assumption that the same flow rate as the flow rate of the test valve flows in the control valve.

In one embodiment, the control unit, calculates the opening degree of the control valve based on the flow coefficient of the control valve, in order to minimize the error of the calculated opening degree, through the PID control to add the opening degree of the control valve Can be calculated as

In an embodiment, the controller may further calculate the opening degree of the control valve to receive the second pressure signal upstream of the test valve and perform the PID control to maintain the set differential pressure of the test valve. .

Flow control test control method according to an embodiment for realizing the object of the present invention to control the flow control test system that simulates the operating environment of the nuclear power plant, and sets the target pressure upstream of the test valve. Calculate the flow rate through the test valve. The flow coefficient of the control valve is calculated based on the flow rate of the test valve. The opening degree of the control valve is calculated based on the flow coefficient of the control valve. PID control further calculates the opening degree of the control valve.

In one embodiment, the calculating of the flow rate flowing through the test valve may include measuring a flow coefficient according to an opening degree of the test valve, and a difference between a second pressure upstream and a third pressure downstream of the test valve. Measuring the differential pressure.

In one embodiment, the flow rate (Qm) flowing through the test valve,

식 (1)

Formula (1)

: 시험밸브에 흐르는 유체의 밀도}{Cv: flow coefficient according to test valve opening, dp: test valve differential pressure,

: Density of fluid flowing through the test valve}

It can be calculated by the above formula (1).

In one embodiment, in calculating the flow coefficient of the control valve, the flow coefficient of the control valve may be calculated assuming that the same flow rate as the flow rate of the test valve flows in the control valve.

In one embodiment, the flow coefficient (Cvc) of the control valve,

식 (2)

Formula (2)

: 제어밸브에 흐르는 유체의 밀도}{Qm: flow rate through the test valve, dpc: control valve differential pressure,

: Density of fluid flowing through the control valve}

It can be calculated by the above formula (2).

In one embodiment, the opening degree (Ac) of the control valve,

식 (3)

Formula (3)

식 (4)

Formula (4)

식 (5)

Equation (5)

{Rc: control valve characteristic value, Cvc: control valve flow coefficient, Cvcmax: flow coefficient when control valve opening is 100%}

It can be calculated by the above formulas (3) to (5).

In an exemplary embodiment, the calculating of the opening degree of the control valve may further include receiving the second pressure signal upstream of the test valve, and performing the PID control to maintain the set target pressure of the test valve. The opening of the control valve can be further calculated.

In one embodiment, it may be repeated to calculate the opening degree of the control valve by periodically calculating the flow rate flowing in the test valve.

According to embodiments of the present invention, the problem of calculating the opening degree of a control valve using only conventional PID control is solved, and the control is performed by first calculating the opening degree of the control valve based on a physical law based on the actual flow rate. In this case, the error or error generated can be further controlled by using PID control to finely adjust the opening degree of the control valve, so that the target pressure set upstream of the test valve can be more accurately followed.

Thus, following the control of the nuclear power plant simulation test valve with a large change in pressure and flow rate from the macroscopic viewpoint to the physical law, and furthermore, the effective PID control in the relatively small control is applied from the microscopic perspective. In addition, the advantages of PID control can be further leveraged to follow the target pressure to improve reproducibility while maintaining more accurate consistency.

In particular, it solves a problem that it is difficult to follow in a system having relatively large changes in pressure and flow rate, and controls the average flow rate and pressure through physical laws and controls fine errors using a PID control method.

As a result, the maintenance of the target pressure of the test valve is effectively controlled, so that the test on the performance of the test valve can be more accurately implemented in the ultimately simulated operating environment of the nuclear power plant.

Figure 1 is a schematic diagram showing a control system for the flow blocking test of the original electric machine according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a method of controlling a flow interruption test of the original electric machine using FIG.
3 is a flowchart illustrating a step of calculating a flow rate flowing through the test valve of FIG. 2.
4A and 4B are graphs illustrating a pressure error, a storage tank pressure, and an upstream pressure when only the conventional PID control is applied.
5A and 5B are graphs illustrating a pressure error, a storage tank pressure, and an upstream pressure when the control method of FIG. 2 is applied.

As the inventive concept allows for various changes and numerous modifications, the embodiments will be described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprise" or "consist of" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention.

Figure 1 is a schematic diagram showing a control system for the flow blocking test of the original electric machine according to an embodiment of the present invention.

Referring to FIG. 1, the control system 10 (hereinafter, referred to as the control system 10) for the flow interruption test of the original electric machine according to the present embodiment is for a nuclear power valve which is one of the original electric machines used in a nuclear power plant. For a performance test, the present invention relates to a control system that performs control of a system that simulates the usage environment of a nuclear power plant.

That is, the control system 10 may be referred to as a control system for more accurately evaluating a nuclear power valve that is an evaluation target, including a system that is similar to the use environment of a nuclear power plant.

In general, in the case of nuclear power valves used in nuclear power plants, it should be verified according to ASME QME-1, and in the verification according to ASME QME-1, the flow blocking test is a very important test.

The flow blocking test is characterized in that the operability is evaluated while applying the maximum differential pressure set under the operating conditions of the nuclear power plant, that is, the pressure difference between both ends of the valve, to both ends of the valve to be tested.

In this flow-blocking test, it is very important to evaluate the performance of the valve under test similarly because the actual operating conditions of the nuclear power plant are high temperature and high pressure, and the change in the differential pressure or flow rate at both ends is similar.

Accordingly, the control system 10 according to the present embodiment includes a storage tank 100, a control valve 200, a test valve 300, a control unit 400, and a flow path unit 500. It is possible to effectively perform the performance evaluation on the valve under test by simulating an environment for evaluating a nuclear power valve in an operating environment, and effectively simulating a situation where a change in the differential pressure and a flow rate is particularly large as operating conditions in a nuclear power plant.

More specifically, the storage tank 100 is a tank in which fluid is stored therein, and is located at one end of the control valve 200 and the test valve 300, and the flow valve unit is connected to the control valve 200. It is connected to the first flow path 510 of 500.

In this case, the size and capacity of the storage tank 100 may be designed to provide a pressure and a flow rate required for the test evaluation, and accordingly, the storage tank 100 may have the first flow path 510. The fluid may be provided at the first pressure P1 to the control valve 200 through the.

The control valve 200 is controlled by the control unit 400, the open rate (open rate), the control method of the opening degree of the control valve 200 will be described later.

The control valve 200 is connected to the storage tank 100 through a first flow path 510, and the test valve 300 is connected through a second flow path 520 of the flow path part 500.

In this case, as described above, when the pressure of the fluid in the first flow path 510 is defined as the first pressure P1, and the pressure of the fluid in the second flow path 520 is determined as the second pressure P2. As the opening degree is controlled by the controller 400, the fluid provided at the first pressure P1 is provided to the test valve 300 at the second pressure P2.

That is, the control valve 200 is controlled by the control unit 400, thereby controlling the second pressure (P2) to match the target pressure applied to the test valve (300).

After all, controlling the opening degree of the control valve 200 is to control the pressure applied to the test valve 300, in order to maintain a constant target pressure to be applied to the test valve 300, the control The opening degree of the valve 200 should be controlled in various ways.

The test valve 300 is a valve for a flow interruption test as a nuclear power valve.

The test valve 300 is connected upstream with the control valve 200 by a second flow passage 520, and downstream thereof is connected with a third flow passage 530.

In this case, although not shown, the third flow path 530 is connected to the storage tank 100, and the fluid used for the test may be provided to the storage tank 100 again.

The test and evaluation of the test valve 300 is performed by applying a difference in pressure at both ends of the test valve 300, ie, upstream and downstream, and converts the pressure of the upstream second flow path 520 into the second pressure. (P2) If the pressure of the downstream third flow path 530 is defined as a third pressure P3, the performance of the test valve 300 through the differential pressure that is the difference between the second pressure and the third pressure. An evaluation will be performed.

In this case, the differential pressure required for the performance evaluation of the test valve 300 is already provided as a set value, and if the third pressure P3 is kept constant, eventually the test and evaluation of the test valve 300 May be performed by maintaining the second pressure P2 at a target pressure.

As described above, the performance evaluation of the test valve 300 may be performed by maintaining the second pressure P2 at a predetermined set value, which is a state in which the opening degree of the test valve 300 is variously set. Also, it is essential to maintain the second pressure P2 at a set value.

As a result, by controlling the opening degree of the control valve 200, the second pressure (P2) is maintained at the set value set for the test in various environments, thereby maintaining the differential pressure at both ends of the test valve 300 at the set value It is necessary to do

The controller 400 controls the control valve 200 and the test valve 300. That is, the controller 400 controls the opening degree of the control valve 200, in particular, to maintain the differential pressure at both ends of the test valve 300 at the set value set for the test.

In this case, the control unit 400 calculates the flow coefficient and the opening degree of the control valve 200 from the flow rate of the test valve 300, and through the PID (proportional integral derivative control) control of the control valve 200 The opening degree is further calculated to finally control the opening degree of the control valve 200.

More specifically, the control method of the control unit 400 will be described later.

The flow path part 500 may include first to third flow paths 510, 520, and 530. As described above, the first flow path 510 may have the storage tank at a first pressure P1. 100) and the control valve 200, the second flow path 520 connects the control valve 200 and the test valve 300 at a second pressure (P2), the third flow path ( 530 connects the test valve 300 to the outside at a third pressure P3.

FIG. 2 is a flowchart illustrating a method of controlling a flow interruption test of the original electric machine using FIG. 1. 3 is a flowchart illustrating a step of calculating a flow rate flowing through the test valve of FIG. 2.

Referring to FIG. 2, in the flow interruption test control method of the original electric machine using the flow interruption test control system 10 of the original electric machine, first, a target pressure upstream of the test valve 300 is set (step S10).

As described above, the performance evaluation of the test valve 300, which is the object of the flow blocking test in the present embodiment, needs to be performed while maintaining the differential pressure at both ends of the test valve 300. Assuming that the third pressure P3 is constant, it is necessary to set a target pressure for the second pressure P2.

That is, setting the target pressure with respect to the second pressure P2 means setting the differential pressures at both ends of the test valve 300. Otherwise, if the third pressure P3 is changed, Instead of setting the second pressure P2 as the target pressure, the differential pressure at both ends of the test valve 300 may be replaced with the target differential pressure.

2 and 3, the flow rate flowing through the test valve 300 is calculated (step S20).

In this case, in order to calculate the flow rate which flows through the said test valve 300, it is necessary to measure the flow coefficient according to the opening degree of the said test valve 300 (step S21).

Although not shown, the flow coefficient Cv according to the opening degree of the test valve 300 may be measured using a separate flow meter.

Thereafter, the differential pressures dp of both ends of the test valve 300 are measured (step S22).

In order to measure the differential pressure at both ends of the test valve 300, the second pressure P2 upstream and the third pressure P3 downstream may be measured, and then the differential pressure may be calculated and derived.

Thus, after measuring the flow coefficient (Cv) and the differential pressure (dp) of both ends according to the opening degree of the test valve 300, the flow rate (Qm) flowing through the test valve 300 through the following equation (1) Can be calculated

식 (1)

Formula (1)

: 시험밸브에 흐르는 유체의 밀도}{Cv: flow coefficient according to test valve opening, dp: test valve differential pressure,

: Density of fluid flowing through the test valve}

In this case, the density of the fluid flowing in the test valve 300 may be derived through a thermodynamic state equation according to the fluid used.

After that, referring to FIG. 2, the flow rate coefficient Cvc of the control valve 200 is calculated from the flow rate Qm flowing through the test valve 300 (step S30).

When calculating the flow coefficient Cvc of the control valve 200, the test valve considering that the first flow path 510, the second flow path 520, and the third flow path 530 are the same size. It may be assumed that a flow rate equal to the flow rate flowing through 300 flows through the control valve 200.

That is, assuming that the same flow rate as that of the test valve 300 flows in the control valve 200, the flow coefficient Cvc of the control valve 200 may be derived through the following equation (2). have.

식 (2)

Formula (2)

: 제어밸브에 흐르는 유체의 밀도}{Qm: flow rate through the test valve, dpc: control valve differential pressure,

: Density of fluid flowing through the control valve}

)는 이미 구한 시험밸브(300)에 흐르는 밀도(

)와 동일하다. In this case, a differential pressure (dpc) of both ends of the control valve 200 may be derived through the pressure of the storage tank 100, and the fluid flowing through the control valve 200 is a fluid flowing through the test valve 300. Is the same as the density of the fluid (

) Is the density (

Same as)

Thereafter, referring to FIG. 2, the opening degree of the control valve 200 is calculated based on the flow coefficient Cvc of the control valve 200 (step S40).

In this case, assuming that the control valve 200 is a preceding valve, the opening degree Ac of the control valve 200 is calculated through the following equations (3) to (5).

식 (3)

Formula (3)

식 (4)

Formula (4)

식 (5)

Equation (5)

{Rc: control valve characteristic value, Cvc: control valve flow coefficient, Cvcmax: flow coefficient when control valve opening is 100%}

In this case, the characteristic value (Rc) of the control valve 200 is when the conditions related to the flow rate, such as the type of fluid, temperature, pressure, pressure difference is constant, when all the valves for the flow rate when all the valves are closed It is rangeability that is the ratio of the flow rate of. In addition, the rangeability may be experimentally derived in advance or the value may be derived based on data of a supplier.

Accordingly, the opening degree Ac of the control valve 200 may be primarily derived through the equations (3) to (5), that is, using a physical law. The control valve 200 is controlled based on the derived opening degree Ac of the control valve 200.

However, when controlling based on the opening degree Ac of the control valve 200 derived by the physical law, the macroscopic control of the opening degree of the control valve 200 is possible, but the actual micro control valve 200 is Control of the opening degree is difficult.

That is, errors due to factors such as time delay or various physical disturbances, for example, phase change, condensation, heat transfer, etc. of the components including the control valve 200 are accumulated. In an environment where the flow rate is large, this error makes it difficult to accurately control the opening degree of the control valve 200.

Accordingly, referring to FIG. 2, in the present embodiment, the opening degree of the control valve 200 is further calculated through PID control (step S50).

That is, by comparing the measured value for the second pressure (P2) upstream of the test valve 300 and the target pressure upstream of the preset test valve 300, the error value is calculated, and the pressure error is inputted. PID (proportional integral derivative control) control is performed with the data to minimize the pressure error.

Thus, in addition to controlling the opening degree with an accuracy of approximately 80 to 90% through macroscopic control of the opening degree of the control valve 200, the opening degree is controlled through the PID control for the remaining error of about 10 to 20%. It can improve the accuracy of control.

In this case, the specific method of the PID control is a conventionally known control method, and redundant description thereof will be omitted.

As described above, the controller 400 controls the opening degree of the control valve 200.

On the other hand, the flow rate passing through the test valve 300 is not constant, it is changed according to the opening degree of the control valve 200 as well as the opening degree of the test valve 300.

Therefore, the opening degree of the control valve 200 controlled through the steps must be adjusted repeatedly.

Accordingly, the steps (steps S20 to S50) of calculating the opening degree of the control valve 200 are repeated, and each time, the opening degree of the control valve 200 is derived, and the controller 400 is based on this. Is to control the control valve 200.

4A and 4B are graphs illustrating a pressure error, a storage tank pressure, and an upstream pressure when only the conventional PID control is applied.

4A and 4B, as a result of controlling the opening degree of the control valve 200 using only conventional PID control, 0.02 is set to a pressure error value that is a difference between the measured second pressure P2 and a target pressure. The result of controlling the opening degree of the said control valve 200 by multiplying is shown.

As can be seen through FIG. 4A, as time passes, the pressure P2 upstream of the test valve 300 does not follow the target pressure, and an error that is a difference from the target pressure increases.

In addition, as confirmed through FIG. 4B, as the pressure of the storage tank 100, that is, the first pressure P1, decreases with time, the pressure P2 upstream of the test valve 300 also decreases. Thus, unlike the second pressure P2 maintaining the target pressure, a result of following the first pressure P1 may be confirmed.

5A and 5B are graphs illustrating a pressure error, a storage tank pressure, and an upstream pressure when the control method of FIG. 2 is applied.

5A and 5B, as a result of controlling the opening degree of the control valve 200 through the flow shutoff test control method according to the present embodiment, the control valve is primarily macroscopically by a physical calculation method ( The opening degree of the control valve 200 is microscopically calculated through the PID control.

As shown in FIG. 5A, as a result of controlling the opening degree of the control valve 200 through the flow blocking test control method according to the present embodiment, the pressure P2 upstream of the test valve 300 as time passes. By following this target pressure accurately, it can be confirmed that there is almost no pressure error that is the difference between the upstream pressure P2 and the target pressure.

In addition, as shown in Figure 5b, despite the pressure of the storage tank 100, that is, the first pressure (P1) decreases over time, the pressure (P2) upstream of the test valve 300 is It can be seen that it is maintained constant, so that the target pressure can be maintained accurately.

As described above, in particular, in consideration of the fact that PID control becomes higher in accuracy of control when the amount of error is relatively small, in the present embodiment, the opening degree of the control valve 200 is primarily determined by the test valve 300. By controlling based on the result calculated from the flow rate and minimizing the error by the remaining variables by applying PID control, it is possible to more accurately maintain the target pressure upstream of the test valve 300 in the flow shutoff test.

According to the embodiments of the present invention as described above, the problem of calculating the opening degree of the control valve using only conventional PID control is solved, and the opening degree of the control valve is first calculated based on the physical law based on the actual flow rate. Control is performed, and in this case, the error or error generated can be further controlled by using PID control to finely adjust the opening degree of the control valve, thereby more accurately following the target pressure set upstream of the test valve.

Thus, following the control of the nuclear power plant simulation test valve with a large change in pressure and flow rate from the macroscopic viewpoint to the physical law, and furthermore, the effective PID control in the relatively small control is applied from the microscopic perspective. In addition, the advantages of PID control can be further leveraged to follow the target pressure to improve reproducibility while maintaining more accurate consistency.

In particular, it solves a problem that it is difficult to follow in a system having relatively large changes in pressure and flow rate, and controls the average flow rate and pressure through physical laws and controls fine errors using a PID control method.

As a result, the maintenance of the target pressure of the test valve is effectively controlled, so that the test on the performance of the test valve can be more accurately implemented in the ultimately simulated operating environment of the nuclear power plant.

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

The control system for the flow interruption test of the original electric machine according to the present invention and the method for controlling the flow interruption test of the original electric machine using the same have industrial applicability that can be used for the flow interruption test through nuclear power plant simulation.

10: flow control test system
100: storage tank 200: control valve
300: test valve 400: control unit
500: flow path portion 510: first flow path
520: second euro 530: third euro

Claims (12)

In the flow control test system that simulates the operating environment of a nuclear power plant,
A storage tank storing the fluid and providing the stored fluid at a first pressure through the first flow path;
A control valve for discharging the fluid provided at the first pressure to the second pressure through a second flow path as the opening degree is controlled;
A test valve which is set to a differential pressure which is a difference between the second pressure of the second flow path upstream and the third pressure of the third flow path downstream, and which is subject to a flow interruption test; And
Using the same size of the first to third flow paths, a flow rate coefficient of the control valve is derived from the flow rate of the test valve on the assumption that the same flow rate as the flow rate of the test valve flows to the control valve, and the control And a control unit for first calculating the opening degree of the control valve from a flow coefficient of the valve, and further calculating the opening degree of the control valve through PID (proportional integral derivative control) control to control the opening degree of the control valve. ,
The controller may compare the second pressure of the second flow path with a preset target pressure of the second flow path to calculate an error, and perform the PID control using the pressure error as input data. Control system. delete delete The method of claim 1, wherein the control unit,
And receiving the second pressure signal upstream of the test valve, and further calculating the opening degree of the control valve to perform the PID control to maintain the set differential pressure of the test valve. And a control valve positioned between the first flow path and the second flow path, and a test valve located between the second flow path and the third flow path, for controlling a flow interruption test control system that simulates an operating environment of a nuclear power plant.
Setting a target pressure of the second flow path upstream of a test valve;
Calculating a flow rate flowing through the test valve;
Calculating a flow coefficient of the control valve based on the flow rate of the test valve on the assumption that the same flow rate as the flow rate of the test valve flows to the control valve using the same size of the first to third flow paths; ;
Firstly calculating an opening degree of the control valve based on a flow coefficient of the control valve; And
Further calculating the opening degree of the control valve through PID control,
In the step of further calculating the opening degree of the control valve, the error is calculated by comparing the second pressure of the second flow path and the preset target pressure of the second flow path, and the PID error as the input data to the PID control Flow block test control method, characterized in that performing. The method of claim 5, wherein calculating the flow rate of the test valve comprises:
Measuring a flow coefficient according to the opening degree of the test valve; And
And measuring a differential pressure that is a difference between a second pressure upstream of the test valve and a third pressure downstream of the test valve. The method of claim 6,
Flow rate (Qm) flowing through the test valve,

Formula (1)
{Cv: flow coefficient according to test valve opening, dp: test valve differential pressure,

: Density of fluid flowing through the test valve}
Flow block test control method, characterized in that calculated by the formula (1). According to claim 5, In the step of calculating the flow coefficient of the control valve,
And a flow rate coefficient of the control valve is calculated on the assumption that a flow rate equal to that of the test valve flows in the control valve. The method of claim 8,
Flow rate coefficient (Cvc) of the control valve,

Formula (2)
{Qm: flow rate through the test valve, dpc: control valve differential pressure,

: Density of fluid flowing through the control valve}
Flow block test control method, characterized in that calculated by the formula (2). The method of claim 5,
The opening degree Ac of the control valve is

Formula (3)

Formula (4)

Equation (5)
{Rc: control valve characteristic value, Cvc: control valve flow coefficient, Cvcmax: flow coefficient when control valve opening is 100%}
Flow control test control method characterized in that it is calculated by the formulas (3) to (5). The method of claim 5, wherein further calculating the opening degree of the control valve,
Receiving the second pressure signal upstream of the test valve, and performing the PID control to further calculate the opening degree of the control valve to maintain the set target pressure of the test valve; . The method of claim 5,
And periodically calculating the flow rate flowing through the test valve to calculate the opening degree of the control valve.

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