Steam temperature control using dynamic matrix control
First Claim
1. A method of maintaining an output steam temperature of a steam generating boiler system at a desired output steam temperature setpoint, comprising:
- obtaining a signal indicative of a disturbance variable used in a control loop of the steam generating boiler system operating to maintain a temperature of output steam at the desired output steam temperature setpoint, the signal indicative of the disturbance variable generated by a device included in a second portion of the steam generating boiler system, the portion of the steam generating boiler system excluding any devices included in the control loop;
determining a rate of change of the disturbance variable;
providing a signal indicative of the rate of change of the disturbance variable to an input of a dynamic matrix controller;
generating, by the dynamic matrix controller while the control loop of the steam generating boiler system is operating to maintain the temperature of the output steam at the desired output steam temperature setpoint, a control signal for a manipulated variable used in the control loop of the steam generating boiler system, the generating of the control signal for the manipulated variable based on the signal indicative of the rate of change of the disturbance variable and a signal indicative of the desired output steam temperature setpoint; and
controlling, based on the control signal for the manipulated variable, the temperature of the output steam to be maintained at the desired output steam temperature setpoint, wherein the output steam is generated by the control loop of the steam generating boiler system for delivery to a turbine.
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Accused Products
Abstract
A technique of controlling a steam generating boiler system includes using a rate of change of disturbance variables to control operation of a portion of the boiler system, and in particular, to control a temperature of output steam to a turbine. The technique uses a primary dynamic matrix control (DMC) block to control a field device that, at least in part, affects the output steam temperature. The primary DMC block uses the rate of change of a disturbance variable, a current output steam temperature, and an output steam temperature setpoint as inputs to generate a control signal. A derivative DMC block may be included to provide a boost signal based on the rate of change of the disturbance variable and/or other desired weighting. The boost signal is combined the control output of the primary DMC block to more quickly control the output steam temperature towards its desired level.
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Citations
13 Claims
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1. A method of maintaining an output steam temperature of a steam generating boiler system at a desired output steam temperature setpoint, comprising:
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obtaining a signal indicative of a disturbance variable used in a control loop of the steam generating boiler system operating to maintain a temperature of output steam at the desired output steam temperature setpoint, the signal indicative of the disturbance variable generated by a device included in a second portion of the steam generating boiler system, the portion of the steam generating boiler system excluding any devices included in the control loop; determining a rate of change of the disturbance variable; providing a signal indicative of the rate of change of the disturbance variable to an input of a dynamic matrix controller; generating, by the dynamic matrix controller while the control loop of the steam generating boiler system is operating to maintain the temperature of the output steam at the desired output steam temperature setpoint, a control signal for a manipulated variable used in the control loop of the steam generating boiler system, the generating of the control signal for the manipulated variable based on the signal indicative of the rate of change of the disturbance variable and a signal indicative of the desired output steam temperature setpoint; and controlling, based on the control signal for the manipulated variable, the temperature of the output steam to be maintained at the desired output steam temperature setpoint, wherein the output steam is generated by the control loop of the steam generating boiler system for delivery to a turbine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification