MULTIVARIABLE CONTROLS OF HEAT RECOVERY STEAM GENERATION SYSTEM
First Claim
1. A method of controlling a heat recovery steam generator (HRSG), comprising:
- measuring a first regulated output of the HRSG and a second regulated output of the HRSG;
comparing the first regulated output to a first setpoint defining a first target output to generate a first error signal and comparing the second regulated output to a second setpoint defining a second target output to generate a second error signal; and
generating, by a controller implementing a multivariable control algorithm having as inputs the first error signal and the second error signal, control signals to control the HRSG to adjust values of the first regulated output and the second regulated output.
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Abstract
A method of controlling a heat recovery steam generator (HRSG) includes measuring a first regulated output of the HRSG and a second regulated output of the HRSG. The method includes comparing the first regulated output to a first setpoint defining a first target output to generate a first error signal and comparing the second regulated output to a second setpoint defining a second target output to generate a second error signal. The method also includes generating, by a controller implementing a multivariable control algorithm having as inputs the first error signal and the second error signal, control signals to control the HRSG to adjust values of the first regulated output and the second regulated output.
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Citations
16 Claims
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1. A method of controlling a heat recovery steam generator (HRSG), comprising:
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measuring a first regulated output of the HRSG and a second regulated output of the HRSG; comparing the first regulated output to a first setpoint defining a first target output to generate a first error signal and comparing the second regulated output to a second setpoint defining a second target output to generate a second error signal; and generating, by a controller implementing a multivariable control algorithm having as inputs the first error signal and the second error signal, control signals to control the HRSG to adjust values of the first regulated output and the second regulated output. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of controlling a heat recovery steam generator (HRSG) comprising:
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providing to a controller first and second input variables corresponding to measurements of first and second interdependent properties of the HRSG; and generating, by the controller, first and second control signals to control the first and second interdependent properties of the HRSG, the controller generating the first and second control signals by executing a multi-variable algorithm, the multi-variable algorithm generating the first control signal based on the first input variable and the second input variable, and the multi-variable algorithm generating the second control signal based on the second input variable and the first input variable. - View Dependent Claims (8, 9, 10, 11)
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12. A heat recovery steam generator system, comprising:
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an evaporator configured to evaporate liquid water to generate steam; a steam drum configured to receive steam from the evaporator and liquid water to maintain the liquid in the steam drum at a predetermined level and the steam in the steam drum at a predetermined pressure; a feed-water flow pipe configured to provide a feed-water flow to the steam drum; a steam flow pipe configured to direct a flow of steam from the steam drum; and a controller configured to receive as inputs a first error signal corresponding to a difference between a measured water level and a first setpoint corresponding to a target water level and a second error signal corresponding to a difference between a measured steam pressure and a second setpoint corresponding to a target steam pressure, and to generate, based on a multi-variable algorithm having as inputs the first and second error signals, control signals to adjust the feed-water flow and a steam flow based on the first and second error signals. - View Dependent Claims (13, 14, 15, 16)
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Specification