Method and System for Modeling Behavior in a Process Plant
First Claim
1. A method for modeling behavior in a process plant, comprising:
- receiving M process variable data sets, wherein M is an integer;
calculating statistical data for process variables associated with the M process variable data sets using the M process variable data sets and not using additional process variable data sets;
scaling the M process variable data sets using the statistical data;
calculating a plurality of intermediate modeling terms using the scaled M process variable data sets;
receiving the additional process variable data sets associated with the process variables;
scaling the additional process variable data sets using the statistical data;
after calculating the plurality of intermediate modeling terms using the scaled M process variable data sets, updating the plurality of intermediate modeling terms using the scaled additional process variable data sets; and
calculating a model of the process variable using the plurality of intermediate modeling terms.
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Abstract
In a method for generating a model for modeling at least a portion of the process plant, M process variable data sets, where M is an integer, may be used to determine statistical data that may be utilized to scale process variable data sets. The M process variable data sets are scaled and then utilized to calculate intermediate model terms. For each additional process variable data set, it is scaled using the statistical data and then utilized to update the intermediate model terms. When an adequate number of process variable data sets have been processed, the model may be calculated using the intermediate model terms.
68 Citations
23 Claims
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1. A method for modeling behavior in a process plant, comprising:
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receiving M process variable data sets, wherein M is an integer; calculating statistical data for process variables associated with the M process variable data sets using the M process variable data sets and not using additional process variable data sets; scaling the M process variable data sets using the statistical data; calculating a plurality of intermediate modeling terms using the scaled M process variable data sets; receiving the additional process variable data sets associated with the process variables; scaling the additional process variable data sets using the statistical data; after calculating the plurality of intermediate modeling terms using the scaled M process variable data sets, updating the plurality of intermediate modeling terms using the scaled additional process variable data sets; and calculating a model of the process variable using the plurality of intermediate modeling terms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for modeling behavior in a process plant, comprising:
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a memory; a processor coupled to the memory, the processor configured according to machine readable instructions stored in the memory to; calculate statistical data for process variables associated with M process variable data sets using the M process variable data sets and not using additional process variable data sets, the M process variable data sets stored in the memory, wherein M is an integer, scale the M process variable data sets using the statistical data, calculate a plurality of intermediate modeling terms using the scaled M process variable data sets, scale additional process variable data sets using the statistical data, after calculating the plurality of intermediate modeling terms using the scaled M process variable data sets, update the plurality of intermediate modeling terms using the scaled additional process variable data sets, and calculate a model of the process variable using the plurality of intermediate modeling terms. - View Dependent Claims (18, 19)
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20. A tangible medium storing machine readable instructions, the machine readable instructions capable of causing one or more machines to:
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calculate statistical data for process variables associated with M process variable data sets using the M process variable data sets and not using additional process variable data sets, the M process variable data sets stored in the memory, wherein M is an integer; scale the M process variable data sets using the statistical data; calculate a plurality of intermediate modeling terms using the scaled M process variable data sets; scale additional process variable data sets using the statistical data; after calculating the plurality of intermediate modeling terms using the scaled M process variable data sets, update the plurality of intermediate modeling terms using the scaled additional process variable data sets; and calculate a model of the process variable using the plurality of intermediate modeling terms. - View Dependent Claims (21, 22)
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23. A system for detecting an abnormal operation in a process plant, comprising:
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a configurable model of a process in the process plant, wherein the configurable model; receives M process variable data sets, wherein M is an integer, calculates statistical data for process variables associated with the M process variable data sets using the M process variable data sets and not using additional process variable data sets, scales the M process variable data sets using the statistical data, calculates a plurality of intermediate modeling terms using the scaled M process variable data sets, receives the additional process variable data sets associated with the process variables, scales the additional process variable data sets using the statistical data, after calculating the plurality of intermediate modeling terms using the scaled M process variable data sets, updates the plurality of intermediate modeling terms using the scaled additional process variable data sets, and calculates a model of the process variable using the plurality of intermediate modeling terms; the system further comprising a deviation detector coupled to the configurable model, the deviation detector configured to determine if the process significantly deviates from an output of the model.
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Specification