Optimizing plant control values of a power plant
First Claim
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1. A method for optimizing power plant control values, where the method comprises the steps of a) determining a trajectory of plant control values {right arrow over (u)}(τ
- ), b) determining from the trajectory of plant control values {right arrow over (u)}(τ
), by simulation of the power plant'"'"'s behavior, corresponding trajectories of costs {right arrow over (c)}(τ
) for operating the plant and trajectories of revenues {right arrow over (q)}(τ
) from selling produced output, c) computing a total operating cost J[u] as an integral of an objective function that comprises a difference between costs {right arrow over (c)}(τ
) and revenues {right arrow over (q)}(τ
), d) iteratively repeating steps a) through c) with the optimization module varying the trajectory of plant control values {right arrow over (u)}(τ
) until an optimized lower total operating cost J[u] is arrived at, characterized in that in step b), by modeling of plant components, a trajectory representing a rate of ageing {right arrow over (e)}(τ
) of plant components is determined from the trajectory of plant control values {right arrow over (u)}(τ
), and that, in step c), the objective function comprises said rate of ageing {right arrow over (e)}(τ
).
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Abstract
In a method and computer program product for optimizing power plant control values and a power plant optimizing system an optimization module (1) minimizes total plant operation costs while achieving predetermined required output values for produced power and process steam. This is done by, at a given time, determining future values of control values and simulating, in a simulation module (2), the behavior of the plant up to a given future time. Corresponding fuel costs and generated power are determined in the simulation, and incorporated in an objective function. The optimization module (1) minimizes the objective function by varying the control values. According to the invention, a rate of ageing of plant components is determined when simulating the future behavior of the plant, and the objective function to be minimized comprises said rate of ageing.
28 Citations
9 Claims
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1. A method for optimizing power plant control values, where the method comprises the steps of
a) determining a trajectory of plant control values {right arrow over (u)}(τ - ),
b) determining from the trajectory of plant control values {right arrow over (u)}(τ
), by simulation of the power plant'"'"'s behavior, corresponding trajectories of costs {right arrow over (c)}(τ
) for operating the plant and trajectories of revenues {right arrow over (q)}(τ
) from selling produced output,c) computing a total operating cost J[u] as an integral of an objective function that comprises a difference between costs {right arrow over (c)}(τ
) and revenues {right arrow over (q)}(τ
),d) iteratively repeating steps a) through c) with the optimization module varying the trajectory of plant control values {right arrow over (u)}(τ
) until an optimized lower total operating cost J[u] is arrived at,characterized in that in step b), by modeling of plant components, a trajectory representing a rate of ageing {right arrow over (e)}(τ
) of plant components is determined from the trajectory of plant control values {right arrow over (u)}(τ
), and that, in step c), the objective function comprises said rate of ageing {right arrow over (e)}(τ
). - View Dependent Claims (2, 3, 4, 5, 6, 7)
- ),
-
8. A power plant optimizing system that optimizes plant control values and comprises
a) an optimization module (1) that is configured to determine a plurality of trajector ies of plant control values {right arrow over (u)}(τ - ) and to determine a total operating cost J[u] as an integral of an objective function that comprises a difference between costs {right arrow over (c)}(τ
) and revenues {right arrow over (q)}(τ
) that are associated with operating the power plant according to the plant control values {right arrow over (u)}(τ
),b) a simulation module (2) that is configured to determine, from the trajectory of plant control values {right arrow over (u)}(τ
), by simulation of the power plant'"'"'s behavior, corresponding trajectories of costs {right arrow over (c)}(τ
) for operating the plant and trajectories of revenues {right arrow over (q)}(τ
) from selling produced output,characterized in that the simulation module (2) is configured to determine, from the trajectory of plant control values {right arrow over (u)}(τ
), a trajectory representing a rate of ageing {right arrow over (e)}(τ
) of plant components, and that the objective function comprises said rate of ageing {right arrow over (e)}(τ
). - View Dependent Claims (9)
- ) and to determine a total operating cost J[u] as an integral of an objective function that comprises a difference between costs {right arrow over (c)}(τ
Specification
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Current AssigneeABB Research Ltd. (ABB Ltd.)
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Original AssigneeABB Research Ltd. (ABB Ltd.)
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InventorsAhrens, Markus, Stothert, Alec, Gallestey Alvarez, Eduardo, Antoine, Marc, Morton, Steve
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current700/31
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CPC Class CodesG05B 13/042 in which a parameter or coe...
