JP4905782B2 - Plant control system, plant control method, and program for plant control - Google Patents

Description

  The present invention relates to a plant control system, a plant control method, and a program for plant control applied to a plant including a plurality of arithmetic devices.

  Systems that enable advanced control by executing multivariable model predictive control and property estimation in real time are known. For example, in a multivariable model predictive control system, for example, a process value is read from a control target at a constant control cycle, a control calculation is executed, and an operation amount that is a calculation result can be output. The property estimation system has a function of reading a measurable process value and outputting a property as an estimation result.

Each of these systems has a scheduler function. The scheduler function is a function for starting / stopping the calculation function and executing the calculation at a fixed period. The scheduler function has a timer inside, and this timer manages the cycle of execution in real time.
JP 2005-92584 A

  These systems can be applied to individual processes in a large-scale plant, and various systems having different calculation purposes and manufacturers can be mixed. As described above, since each system has an internal timer individually, each system operates in an independent cycle.

  However, the calculation result in each system is reflected in the plant, and at the same time, the state of the plant affects the calculation in another system. For this reason, in order to integrate the whole plant and to optimize the whole plant, it is necessary to synchronize the reading and calculation of data in each system, and the systems must be coordinated.

  An object of the present invention is to provide a plant control system, a plant control method, and a program for plant control that can synchronize operations of a plurality of systems.

The plant control system of the present invention executes a first calculation and outputs a calculation result to the plant, and the calculation related to the plant- related data is different from the calculation performed by the first calculation device. And a second arithmetic device that executes a second arithmetic operation based on the first arithmetic device and the second arithmetic device, each of the first arithmetic device and the second arithmetic device being repeatedly executed in a certain order. Is output, and an execution control means for controlling execution timing of the first calculation and the second calculation is provided , and the first calculation device is acquired from the plant in response to the calculation execution request. A prediction calculation based on the generated data is executed as the first calculation, and the prediction result is output to the plant. Serial prediction result, or acquires the calculation result of the calculation performed in the plant control system receives the prediction result, and executes a calculation based on the acquired prediction result or calculation result as the second operation .
According to this plant control system, the execution timing of the first calculation and the second calculation is controlled by outputting the calculation execution request to the first calculation device and the second calculation device, respectively. The first operation and the second operation can be synchronized.

The calculation execution control means outputs a calculation execution request to the second calculation device after outputting the prediction result in the first calculation device, and executes the first calculation after execution of the calculation in the second calculation device. An operation execution request to the arithmetic device may be output.

According to the plant control method of the present invention, the first calculation device that executes the first calculation and outputs the calculation result to the plant and the calculation related to the plant as the calculation different from the calculation by the first calculation device. In a plant control method applied to a plant comprising a second arithmetic device that executes a second arithmetic operation based on each of the first arithmetic device and the second arithmetic device in a certain order A step group for repeatedly outputting a calculation execution request , wherein the first calculation device executes a prediction calculation based on data acquired from the plant as the first calculation in response to the calculation execution request; The prediction result is output to the plant, and the second arithmetic unit receives the prediction result or the prediction result in response to the calculation execution request, Get the operation result of the operation was conducted, and executes a calculation based on the acquired prediction result or calculation result as the second operation.
According to this plant control method, the execution timing of the first calculation and the second calculation is controlled by outputting the calculation execution request to the first calculation device and the second calculation device, respectively. The first operation and the second operation can be synchronized.

The program according to the present invention executes a first calculation and outputs a calculation result to the plant, and a calculation based on data related to the plant as a calculation different from the calculation by the first calculation device. In a program for plant control applied to a plant comprising a second arithmetic device that executes two arithmetic operations, a computer is provided with respect to each of the first arithmetic device and the second arithmetic device . The step of outputting a calculation execution request repeatedly in a certain order is executed, and the first calculation device performs a prediction calculation based on data acquired from the plant in accordance with the calculation execution request. As a calculation, the prediction result is output to the plant, and the second calculation device outputs the prediction result or the prediction result according to the calculation execution request. Only acquires the calculation result of the calculation performed in the plant control device, and executes a calculation based on the acquired prediction result or calculation result as the second operation.
According to this program, the execution timing of the first calculation and the second calculation is controlled by outputting the calculation execution request to the first calculation device and the second calculation device, respectively. The operation and the second operation can be synchronized.

  According to the plant control system of the present invention, the execution timing of the first calculation and the second calculation is controlled by outputting the calculation execution request to the first calculation device and the second calculation device, respectively. The first calculation and the second calculation can be synchronized.

  According to the plant control method of the present invention, the execution timing of the first calculation and the second calculation is controlled by outputting the calculation execution request to the first calculation device and the second calculation device, respectively. The first calculation and the second calculation can be synchronized.

  According to the program of the present invention, the execution timing of the first calculation and the second calculation is controlled by outputting the calculation execution request to the first calculation device and the second calculation device, respectively. The first operation and the second operation can be synchronized.

  Hereinafter, with reference to FIGS. 1-2, one Embodiment of the plant control system by this invention is described.

  FIG. 1 is a block diagram showing the configuration of the plant control system of the present embodiment.

  As shown in FIG. 1, the plant control system of the present embodiment executes a predetermined calculation, outputs a calculation result to the plant 1, executes a predetermined calculation, and outputs the calculation result to the plant. The second arithmetic device 2B that outputs to 1 and the third arithmetic device 2C that executes a predetermined operation and outputs the operation result to the plant 1 are provided. Each arithmetic device 2A, 2B, 2C performs a calculation independently of each other.

  The first arithmetic unit 2A includes a scheduler 21A and an arithmetic unit 22A as its functions. In the example of the present embodiment, the computing device 2A is configured by modifying a part of conventional software for executing a predetermined computation for plant control. The calculation unit 22 is a part of the function of the conventional software.

  The scheduler 21 is configured by newly providing a request reception interface 26 in addition to the timer 23, the start / stop unit 24, and the control execution unit 25 included in the software.

  Similar to the first arithmetic unit 2A, the second arithmetic unit 2B is provided with a scheduler 21B and an arithmetic unit 22B, and the third arithmetic unit 2C is provided with a scheduler 21C and an arithmetic unit 22C. Each of the scheduler 21B and the scheduler 21C is configured in the same manner as the scheduler 21A.

  In FIG. 1, an application 3 is a program for controlling the timing of calculation in the arithmetic devices 2A, 2B, and 2C, and is activated toward the arithmetic devices 2A, 2B, and 2C as a function of a computer on which the program is installed. A request output means 31 is provided for outputting a stop request and an operation execution request. By mounting the application 3 on a computer separate from the arithmetic devices 2A, 2B, and 2C, the timing of the arithmetic can be remotely controlled.

  The request output means 31 and the request reception interface provided in the arithmetic devices 2A, 2B, and 2C function as arithmetic execution control means that cooperate to control the timing of arithmetic operations in the arithmetic devices 2A, 2B, and 2C. To do.

  Next, operation | movement of the plant control system of this embodiment is demonstrated.

  FIG. 2 is a flowchart showing a processing procedure in the application 3.

  In step S1 of FIG. 2, a request for starting is transmitted from the request output means 31 to the arithmetic devices 2A, 2B, 2C. In the first arithmetic device 2A, the request reception interface 26 of the scheduler 21A interprets the received activation request, and the activation / stop unit 24 activates the arithmetic unit 22A.

  Similarly, in the second arithmetic unit 2B, the request reception interface of the scheduler 21B interprets the received activation request and activates the arithmetic unit 22B. In the third arithmetic device 2C, the request reception interface of the scheduler 21C interprets the received activation request and activates the arithmetic unit 22C.

  In this way, the arithmetic units 22A, 22B, and 22C are activated, so that arithmetic processing in the arithmetic devices 2A, 2B, and 2C can be accepted.

  Next, in step S2, a calculation execution request is transmitted from the request output means 31 to the first calculation device 2A. In the first arithmetic unit 2A, the request reception interface 26 of the scheduler 21A interprets the received arithmetic execution request and causes the arithmetic unit 22A to execute arithmetic via the control execution unit 25. As a result, the calculation unit 22A executes a predetermined calculation process once.

  In the calculation process, the calculation unit 22A reads the current data of the plant 1 and executes a calculation using the read data. The calculation result is output to the plant 1.

  Next, in step S3, an operation execution request is transmitted from the request output means 31 to the second arithmetic device 2B. In the second calculation device 2B, the request reception interface of the scheduler 21B interprets the received calculation execution request and causes the calculation unit 22B to execute the calculation. Thereby, in the calculation part 22B, a predetermined calculation process is performed once.

  In the calculation process, the calculation unit 22B reads the current data of the plant 1 and executes a calculation using the read data. The calculation result is output to the plant 1.

  Next, in step S4, a calculation execution request is transmitted from the request output means 31 to the third calculation device 2C. In the third computing device 2C, the request reception interface of the scheduler 21C interprets the received computation execution request and causes the computation unit 22C to execute the computation. As a result, the calculation unit 22C executes a predetermined calculation process once.

  In the calculation process, the calculation unit 22C reads the current data of the plant 1 and executes a calculation using the read data. The calculation result is output to the plant 1.

  Next, in step S5, it is determined whether or not a calculation stop is instructed. If the determination is affirmative, the process proceeds to step S6, and if the determination is negative, the process returns to step S2.

  In step S6, a stop request is transmitted from the request output means 31 to the arithmetic devices 2A, 2B, 2C. In the first arithmetic device 2A, the request reception interface 26 of the scheduler 21A interprets the received stop request, and the start / stop unit 24 stops the function of the arithmetic unit 22A.

  Similarly, in the second arithmetic unit 2B, the request reception interface of the scheduler 21B interprets the received stop request and stops the function of the arithmetic unit 22B. In the third arithmetic device 2C, the request reception interface of the scheduler 21C interprets the received stop request and stops the function of the arithmetic unit 22C.

  After step S6 ends, the series of processing ends.

  As described above, in the plant control system of the present embodiment, the arithmetic devices 2A, 2B, 2C and the application 3 are linked to control the calculation timing on the application 3 side, and the arithmetic devices 2A, 2B, 2C. The computation processing in is synchronized. That is, after the calculation at the first calculation device 2A is completed, the calculation at the second calculation device 2B is performed. After the calculation at the second calculation device 2B is completed, the calculation at the third calculation device 2C is calculated as the third calculation. After completion of the calculation in the device 2C, the calculation in the first calculation device 2A is executed.

  As described above, the calculation results of the calculation devices 2A, 2B, and 2C are reflected in the data of the plant 1, and at the same time, the calculation devices 2A, 2B, and 2C execute the calculation based on the data of the plant 1. For this reason, the order and timing of the calculations in the arithmetic devices 2A, 2B, and 2C affect the individual calculation accuracy. In a state where the calculation order and timing cannot be controlled, the accuracy of plant control and the prediction accuracy of the plant situation are low. descend. On the other hand, in the plant control system of the present embodiment, the calculation order and timing in the calculation devices 2A, 2B, and 2C are completely controlled on the application 3 side, so that the calculation devices 2A, 2B, and 2C are synchronized. Thus, the calculation accuracy can be kept in an ideal state, and the accuracy of plant control and prediction of plant status can be greatly improved. Moreover, the control operation in the plant 1 is also optimized.

  Note that data widely generated in the plant 1 is used as data used for the calculations in the calculation devices 2A, 2B, and 2C. That is, the computations in the arithmetic devices 2A, 2B, and 2C are not limited to the case where the arithmetic results in other arithmetic devices are directly used. For example, in the plant 1, plant control is executed by various methods and process values vary based on analysis data and prediction data obtained by calculations in the calculation devices 2 </ b> A, 2 </ b> B, and 2 </ b> C. In the arithmetic devices 2A, 2B, and 2C, various control values and process values generated in the plant 1 can be read, and the arithmetic results can be updated based on these values.

  As described above, the various data of the plant 1 changes every moment according to the situation of the plant 1 and the calculation results of the calculation devices 2A, 2B, and 2C, so that the calculation devices 2A, 2B, and 2C read the data from the plant 1. By managing the order and timing of executing operations, the accuracy of plant control and prediction accuracy can be greatly improved. By controlling the order and timing of execution of calculations, the entire plant can be integrated and optimized as a whole plant.

  As calculation contents in the calculation device, control contents, prediction, and other calculation contents such as multivariable model predictive control, property estimation, and plant simulator can be widely applied.

  In the above embodiment, the arithmetic devices 2A, 2B, and 2C are configured by modifying software that has been used conventionally, but any method can be selected as a method for configuring the arithmetic execution control means. Note that, as in the present embodiment, by modifying the software such as adding an interface, the original functions of the software can be utilized and the work process can be reduced.

  As described above, according to the present invention, the execution timing of the first calculation and the second calculation is controlled by outputting the calculation execution request to the first calculation device and the second calculation device, respectively. Therefore, the first calculation and the second calculation can be synchronized. Therefore, optimization of the whole plant can be achieved by integrating the whole plant.

  The scope of application of the present invention is not limited to the above embodiment. The present invention can be widely applied to control of a plant provided with a plurality of devices that execute computation.

The block diagram which shows the structure of the plant control system of one Embodiment. The flowchart which shows the process sequence for timing control of a calculation.

Explanation of symbols

1 plant 2A, 2B, 2C arithmetic unit (first arithmetic unit, second arithmetic unit)
3 Application 26 Request reception interface (first interface, second interface, operation execution control means)
31 Request output means (calculation execution control means)

Claims (4)

A first arithmetic unit that executes a first calculation and outputs a calculation result to the plant;
As a calculation different from the calculation by the first calculation device, a second calculation device that executes a second calculation based on data related to the plant;
In a plant control system comprising:
The execution timing of the first calculation and the second calculation is controlled by repeatedly outputting a calculation execution request to each of the first arithmetic unit and the second arithmetic unit in a certain order. Computation execution control means ,
In response to the calculation execution request, the first calculation device executes a prediction calculation based on data acquired from the plant as the first calculation, and outputs the prediction result to the plant.
In response to the calculation execution request, the second calculation device acquires the prediction result or the calculation result of the calculation performed in the plant control apparatus in response to the prediction result, and the acquired prediction result or calculation result A plant control system that executes a calculation based on the second calculation . The calculation execution control means outputs a calculation execution request to the second calculation device after outputting the prediction result in the first calculation device, and executes the first calculation after execution of the calculation in the second calculation device. The plant control system according to claim 1, wherein a calculation execution request to the arithmetic device is output . A first arithmetic unit that executes a first calculation and outputs a calculation result to the plant;
As a calculation different from the calculation by the first calculation device, a second calculation device that executes a second calculation based on data related to the plant;
In a plant control method applied to a plant comprising:
For each of the first arithmetic unit and the second arithmetic unit, a group of steps that repeatedly outputs an arithmetic execution request in a certain order ,
In response to the calculation execution request, the first calculation device executes a prediction calculation based on data acquired from the plant as the first calculation, and outputs the prediction result to the plant.
In response to the calculation execution request, the second calculation device acquires the prediction result or the calculation result of the calculation performed in the plant control apparatus in response to the prediction result, and the acquired prediction result or calculation result A plant control method characterized by executing a calculation based on the second calculation . A first arithmetic unit that executes a first calculation and outputs a calculation result to the plant;
As a calculation different from the calculation by the first calculation device, a second calculation device that executes a second calculation based on data related to the plant;
In a program for plant control applied to a plant comprising
On the computer,
Causing each of the first arithmetic unit and the second arithmetic unit to execute a step group that repeatedly outputs an operation execution request in a certain order ;
In response to the calculation execution request, the first calculation device executes a prediction calculation based on data acquired from the plant as the first calculation, and outputs the prediction result to the plant.
In response to the calculation execution request, the second calculation device acquires the prediction result or the calculation result of the calculation performed in the plant control apparatus in response to the prediction result, and the acquired prediction result or calculation result A program that executes a calculation based on the second calculation .

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