JP2009169772A - Plant operation support device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plant operation support device obtaining a control parameter proper for a process controller without imparting test operation to an actual process, and reflecting the obtained control parameter in the actual process. <P>SOLUTION: This plant operation support device has: an online simulator obtaining a high-accuracy simulation result by online collecting actually measured data from an actual plant and updating an internal model thereof; an analysis part including a control performance confirmation part and a control parameter analysis part; and an operation setting interface performing operation setting to the analysis part and the actual plant. The analysis part receives a value of a state variable from the online simulator, obtains the control parameters proper for the actual plant by performing the test operation to obtain a response of the process, and reflects the obtained control parameters in the actual plant through the operation setting interface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plant operation support apparatus, and more particularly to adjustment of control parameters in a process control apparatus.

  The applicant of the present invention performs a process simulation in parallel with the operation of an actual plant as a plant operation support device that supports the operation of a plant having complicated process control operations such as a chemical process in oil refining and a water treatment process of water and sewage. And has applied for a plant operation support apparatus that predicts the operation of the actual plant based on the simulation results (Patent Document 1).

JP 2005-332360 A

  FIG. 2 is a block diagram showing a conceptual configuration of such a conventional plant operation support apparatus. In FIG. 2, the online simulator 10 obtains highly accurate simulation results by collecting measured data online from the actual plant 20 and updating its internal model. The tracking model unit 11, the parameter adjustment unit 12, It consists of

  The tracking model unit 11 collects actual measurement data from the actual plant 20 online, and performs dynamic simulation while matching the actual measurement data. The tracking model unit 11 passes the value of the state variable calculated by the dynamic simulation to the parameter adjustment unit 12 at a predetermined timing or an arbitrary timing.

  The parameter adjustment unit 12 performs parameter adjustment calculation based on, for example, the balance of the entire plant and reflects the calculation in the online simulator 10. As a reference for the adjustment calculation, for example, the one that minimizes the weighted error sum of squares of the measurement data (simulation data that can be specified in advance) and the simulation data specified in advance is selected.

  By performing parameter adjustment calculation online as described above, a highly accurate model reflecting the current situation of the plant can be used, and prediction calculation and optimization calculation based on an analysis model can be performed.

  By the way, when adjusting the control parameters in the process control apparatus constituting the conventional actual plant 20, the operator adjusts by trial and error, or gives some test operation to the actual control object, and the response characteristics are adjusted. It has been performed using a model that approximates a process in a specific system such as a first-order lag system or an integration system.

  However, in the control parameter adjustment using the conventional approximate model, it is said that an appropriate control performance cannot be obtained if the operation is performed under a condition different from the operation condition for which the approximate model is obtained, particularly in a process with strong nonlinearity. There's a problem.

  In addition, in order to obtain an appropriate control parameter, a test operation must be given to the actual process near the actual operating conditions.

  Furthermore, for example, when the control parameters up to that point become inappropriate due to a change in operating conditions, the test parameters must be given again to the actual plant to obtain the control parameters.

  In addition, when adjusting the control parameters on a trial and error basis based on the rules of thumb of the operator, the behavior of the control devices that make up the actual process is directly changed, so the adjusted control parameters are optimal. In addition, there is a problem that the behavior of the process after the adjustment is given cannot be grasped in advance.

  The present invention solves these problems, and its purpose is to obtain an appropriate control parameter in the process control apparatus without giving a test operation to the actual process, and to reflect the obtained control parameter in the actual process. It is to realize a plant operation support apparatus that can be used.

In order to achieve such a problem, the invention according to claim 1 of the present invention is an online simulator that obtains highly accurate simulation results by collecting measured data online from an actual plant and updating its internal model. An analysis unit including a control performance confirmation unit and a control parameter analysis unit, and an operation setting interface for performing operation settings for the actual plant and the analysis unit,
The analysis unit receives a value of a state variable from the online simulator, obtains a process response by performing a test operation, obtains an appropriate control parameter for the actual plant, and sends the obtained control parameter via the operation setting interface. The plant operation support apparatus is reflected in the actual plant.

  According to a second aspect of the present invention, in the plant operation support apparatus according to the first aspect, the analysis unit is modeled in accordance with a physical or chemical principle.

  According to a third aspect of the present invention, in the plant operation support device according to the first or second aspect, the analysis unit includes at least one control parameter analysis unit.

  According to a fourth aspect of the present invention, in the plant operation support device according to any one of the first to third aspects, the operation setting interface provides the actual plant with control parameters appropriate for the actual plant obtained by the analysis unit. The process behavior prediction when reflected is displayed on the screen.

  The invention according to claim 5 is the plant operation support device according to any one of claims 1 to 4, wherein the calculation time of the online simulator is made earlier than the actual time in the analysis of the control parameter. .

  According to the present invention, it is possible to obtain an appropriate control parameter for the process control apparatus without giving a test operation to the actual process, and to reflect the obtained control parameter in the actual process.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, and the same reference numerals are given to portions common to FIG.

  In FIG. 1, an analysis unit 30 is connected to the online simulator 10, and an operation setting interface 40 is connected to the analysis unit 30. The operation setting interface 40 is also connected to the actual plant 20.

  The analysis unit 30 includes a control performance confirmation unit 31 and a control parameter analysis unit 32.

  The operation setting interface 40 includes a control parameter setting unit 41, an analysis condition setting unit 42, an analysis result display unit 43, and the like.

  The online simulator 10 is a process simulator that is configured to generate a process as a model in accordance with laws of physics and chemistry, and that also models an algorithm of a control device.

  The tracking model unit 11 constituting the online simulator 10 acquires a set value and a process value for locally adjusting the simulator model from the actual plant 20. In addition, the parameter adjustment unit 12 corrects the model parameter periodically or as necessary in order to make the entire simulator model an appropriate parameter. In this way, the tracking model unit 11 always functions as a simulator that appropriately simulates the state of the actual plant 20.

  The control performance confirmation unit 31 that constitutes the analysis unit 30 simulates an actual plant and is configured by a model that conforms to physics and chemistry. The value of the current state variable or the value of the past state variable is obtained from the tracking model unit 11. Can be captured as an initial state for simulation.

  The control parameter analysis unit 32 is provided with a model based on physics and chemistry that simulates an actual plant including a control algorithm similar to the process of the actual plant 20. When there is an analysis request from the analysis condition setting unit 42, the control parameter analysis unit 32 takes in the current state variable value or the past state variable value from the tracking model unit 11 as an initial state, and the analysis condition setting unit 42. In accordance with the analysis conditions and algorithm instructed in the above, the amount of test operation required for the analysis of the control parameter is calculated, and the control parameter analysis unit 32 itself is subjected to a test operation such as an impulse signal or a step-like signal so that optimum control is achieved. Calculate the parameters. Here, the value of the state variable fetched from the tracking model unit 11 includes not only an actual process value but also a state quantity inside the process calculated by the tracking model unit 11.

  The analysis result display unit 43 of the operation setting interface 40 displays the type of control device (PID control, model predictive control, etc.) and the current control parameter.

  The analysis condition setting unit 42 uses the limit sensitivity method, the step response method, the limit cycle method, and the like as the algorithm for obtaining the control parameters when analyzing the analysis unit 30 with respect to the analysis conditions and algorithms (for example, when obtaining control parameters for PID control). Selection or model order in the case of model predictive control).

  The control parameter calculated by the control parameter analysis unit 32 is displayed to the driving operator by the analysis result display unit 43. The driving operator checks the output result to see if this result is appropriate. If it is difficult to make a determination based on the control parameter value itself, the control performance confirmation unit 31 is set with control parameters, and various virtual operating conditions are given to the control performance confirmation unit 31 for simulation. The result of this simulation is displayed on the analysis result display unit 43, and it is verified whether desired control performance can be obtained by the calculated control parameter.

  When the driving operator determines that the desired control performance can be obtained based on the result of the analysis, the calculation expressed by the button on the screen of the analysis result display unit 43 with respect to the control parameter setting unit 41, for example. An operation of reflecting the control parameters thus obtained on the control device of the actual plant 20 is given.

  Thereby, the newly determined control parameter can be reflected on the control device of the actual plant 20.

  That is, by using the online simulator 10, the analysis unit 30, and the operation setting interface 40, an operation substantially similar to the test operation that has been directly performed on the actual plant 20 is directly performed on the actual plant 20. Therefore, it is possible to obtain an appropriate control parameter for the control device, and it is possible to safely set an appropriate control parameter for the actual plant 20.

  In the control parameter analysis, a test operation is given to the control parameter analysis unit 32 to obtain a process response, so that the simulation time of the control parameter analysis unit 32 can be made faster than the actual time, and the response in the actual plant 20 Results can be obtained faster than testing.

  Then, by performing a test operation using the control parameter analysis unit 32, a plurality of control parameter analysis methods can be applied to a plurality of response tests, and the operator can select the most appropriate one among them.

  Furthermore, since the online simulator 10 and the analysis unit 30 are composed of models based on the principles of physics and chemistry, the control parameters must be readjusted due to factors such as changes in operating conditions, particularly in a highly nonlinear process. If it is anticipated that it will be necessary, control parameters can be obtained in advance.

  As described above, according to the present invention, there is provided a plant operation support apparatus capable of obtaining an appropriate control parameter in a process control device without giving a test operation to the actual process and reflecting the obtained control parameter in the actual process. realizable.

It is a block diagram which shows one Example of this invention. It is a block diagram which shows an example of the conventional plant operation assistance apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Online simulator 11 Tracking model part 12 Parameter adjustment part 20 Actual plant 30 Analysis part 31 Control performance confirmation part 32 Control parameter analysis part 40 Operation setting interface 41 Control parameter setting part 42 Analysis condition setting part 43 Analysis result display part

Claims (5)

Online simulator that obtains high-precision simulation results by collecting measured data online from actual plant and updating its internal model, analysis unit including control performance confirmation unit and control parameter analysis unit, these actual plant and analysis An operation setting interface for performing operation settings for the unit,
The analysis unit receives a value of a state variable from the online simulator, obtains a process response by performing a test operation, obtains an appropriate control parameter for the actual plant, and sends the obtained control parameter via the operation setting interface. A plant operation support apparatus, which is reflected in the actual plant.   The plant operation support apparatus according to claim 1, wherein the analysis unit is modeled in accordance with a physical or chemical principle.   The plant operation support apparatus according to claim 1, wherein the analysis unit includes at least one control parameter analysis unit.   The operation setting interface displays on a screen a process behavior prediction when a control parameter appropriate for the actual plant obtained by the analysis unit is reflected in the actual plant. The plant operation assistance apparatus in any one.   The plant operation support apparatus according to any one of claims 1 to 4, wherein in the analysis of the control parameter, the calculation time of the online simulator is made earlier than an actual time.

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