STATISTICAL SIGNATURES USED WITH MULTIVARIATE ANALYSIS FOR STEADY-STATE DETECTION IN A PROCESS
First Claim
1. A system for facilitating detection of a steady-state operation of a process in a process plant, the system comprising:
- a data collection tool adapted to collect process data from a process within the process plant, wherein the collected process data is representative of an operation of the process and wherein the collected process data is generated from a plurality of process variables;
an analysis tool comprising a multivariate statistical analysis engine adapted to generate a representation of the operation of the process based on a set of the collected process data representative of the operation of the process, wherein the analysis tool is adapted to execute the representation based on the set of the collected process data to generate a first outcome corresponding to the largest amount of variation in the process; and
a statistical calculation tool adapted to perform a statistical calculation on the first outcome corresponding to the largest amount of variation in the process to generate a statistical measure of the first outcome, and adapted to determine a steady-state operation status related to the process based on the statistical measure.
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Abstract
Methods and systems to detect steady-state operations in a process of a process plant include collecting process data. The collected process data is generated from a plurality of process variables of the process. A multivariate statistical model of the operation of the process is generated using the process data. The multivariate statistical model may be generated from a principal component analysis. The model is executed to generate outputs corresponding to the most significant variations in the process. Statistical measures of the outputs are generated and used to determine whether a steady-state or unsteady-state is related to the process.
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Citations
24 Claims
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1. A system for facilitating detection of a steady-state operation of a process in a process plant, the system comprising:
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a data collection tool adapted to collect process data from a process within the process plant, wherein the collected process data is representative of an operation of the process and wherein the collected process data is generated from a plurality of process variables;
an analysis tool comprising a multivariate statistical analysis engine adapted to generate a representation of the operation of the process based on a set of the collected process data representative of the operation of the process, wherein the analysis tool is adapted to execute the representation based on the set of the collected process data to generate a first outcome corresponding to the largest amount of variation in the process; and
a statistical calculation tool adapted to perform a statistical calculation on the first outcome corresponding to the largest amount of variation in the process to generate a statistical measure of the first outcome, and adapted to determine a steady-state operation status related to the process based on the statistical measure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of facilitating detection of a steady-state operation of a process in a process plant, the method comprising:
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collecting process data from a process within the process plant, wherein the collected process data is representative of an operation of the process and wherein the collected process data is generated from a plurality of process variables;
generating a multivariate statistical representation of the operation of the process based on a set of the collected process data representative of the operation of the process;
generating a first outcome corresponding to the largest amount of variation in the process from the multivariate statistical representation;
generating a statistical measure of the first outcome; and
determining the presence of a steady-state operation status related to the process based on the first statistical measure. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of facilitating detection of a steady-state operation of a process in a process plant, the method comprising:
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collecting process data from a process within the process plant, wherein the collected process data is representative of an operation of the process and wherein the collected process data is generated from a plurality of process variables of the process comprising a first data space having a plurality of dimensions;
generating a model of the operation of the process using a set of the collected process data of the process, wherein the model comprises a measure of the operation of the process when the process is operating at different times within a second data space having fewer dimensions than the first data space;
generating a plurality of outputs from the model of the operation of the process, each output corresponding to a different significant variation in the process;
generating a statistical measure for each of the plurality of outputs; and
determining the presence of a steady-state operation status of the process based on any one of the plurality of statistical measures. - View Dependent Claims (18, 19, 20)
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21. A system for facilitating detection of a steady-state operation of a process in a process plant, the system comprising:
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a data collection tool adapted to collect process data from a process within the process plant, wherein the collected process data is representative of an operation of the process wherein the collected process data is generated from a plurality of process variables of the process comprising a first data space having a plurality of dimensions;
an analysis tool adapted to generate a model of the operation of the process based on a set of the collected process data of the process, wherein the model comprises a measure of the operation of the process when the process is operating at different times within a second data space having fewer dimensions than the first data space, and wherein the analysis tool is adapted to execute the model of the operation of the process to generate a plurality of outputs each corresponding to a different significant variation in the process; and
a statistical calculation tool adapted to perform a statistical calculation on each of the plurality of outputs corresponding to a different significant variation in the process to generate a statistical measure for each of the plurality of outputs, and adapted to determine a steady-state operation status related to the process based on any one of the plurality of statistical measures. - View Dependent Claims (22, 23, 24)
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Specification