Model-based load demand control
First Claim
1. A method of controlling a load generated by a power generating system, comprising:
- receiving a signal indicative of a load demand at an input of a dynamic matrix controller (DMC);
determining, by the dynamic matrix controller, a value of a control signal based on the signal indicative of the load demand and a model stored in a memory of the dynamic matrix controller, the model descriptive of a behavior of a process response at various loads;
generating, by the dynamic matrix controller, the control signal;
switching control of the load generated by the power generating system from being based on a control signal generated by a PID (Proportional-Integral-Derivate) control routine within the power generating system, to being based on the DMC-generated control signal; and
controlling the load generated by the power generating system based on the DMC-generated control signal.
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Accused Products
Abstract
Embodiments of methods and systems for controlling a load generated by a power generating system may include controlling at least a portion of the system using model-based control techniques. The model-based control techniques may include a dynamic matrix controller (DMC) that receives a load demand and a process variable as inputs and generates a control signal based on the inputs and a stored model. The model may be configured based on parametric testing, and may be modifiable. Other inputs may also be used to determine the control signal. In an embodiment, a turbine is controlled by a first DMC and a boiler is controlled by a second DMC, and the control signals generated by the first and the second DMCs are used in conjunction to control the generated load. Techniques to move the power generating system from Proportional-Integral-Derivative based control to model-based control are also disclosed.
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Citations
31 Claims
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1. A method of controlling a load generated by a power generating system, comprising:
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receiving a signal indicative of a load demand at an input of a dynamic matrix controller (DMC); determining, by the dynamic matrix controller, a value of a control signal based on the signal indicative of the load demand and a model stored in a memory of the dynamic matrix controller, the model descriptive of a behavior of a process response at various loads; generating, by the dynamic matrix controller, the control signal; switching control of the load generated by the power generating system from being based on a control signal generated by a PID (Proportional-Integral-Derivate) control routine within the power generating system, to being based on the DMC-generated control signal; and controlling the load generated by the power generating system based on the DMC-generated control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling a load of a power generating system, comprising:
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generating, by a first dynamic matrix controller, a first control signal based on a load demand and a first model stored in a memory of the first dynamic matrix controller, the first model descriptive of a behavior of a first process response at various loads; generating, by a second dynamic matrix controller, a second control signal based on the load demand and a second model stored in a memory of the second dynamic matrix controller, the second model descriptive of a behavior of a second process response at various loads; and controlling the load of the power generating system based on the first control signal and on the second control signal; and at least one of; switching the controlling of the load generated by the power generating system from being based on a third control signal generated by a PID (Proportional-Integral-Derivative) control routine within the power generating system, wherein the third control signal is based on the load demand, to being based on the first control signal generated by the first dynamic matrix controller;
orswitching the controlling of the load generated by the power generating system from being based on the first control signal generated by the first dynamic matrix controller to being based on the third control signal generated by the PID control routine. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A power generating system, comprising:
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a dynamic matrix controller (DMC) including; an input to receive a signal indicative of a load demand for the power generating system, a memory storing a model that is descriptive of a behavior of a process response at various loads, a dynamic matrix control routine configured to determine a value of a control signal based on the model and a value of the load demand, an output to provide the control signal to control a load generated by the power generating system; and a switch for indicating; the load generated by the power generating system is to be controlled by the control signal provided by the output of the DMC instead of by a control signal provided by a Proportional-Integral-Derivative (PID) control entity;
orthe load generated by the power generating system is to be controlled by the control signal provided by the PID control entity instead of the control signal provided by the output of the DMC. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification