System and method for drum level control with transient compensation
AssigneeGeneral Electric Company
InventorsSunil Puthen Veedu Unnikrishnan, Giriprasad Venkata Narasimha Chebiyyam, Charles William Weidner
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Abstract
A level control system for controlling the liquid level in a boiler drum is provided. The level control system uses an integration parameter when operating in a non-transient condition to provide a control signal into a flow control loop controlling a level control valve for the liquid level in the boiler drum. When a transient condition is identified by a predictive controller, the integration parameter is interrupted and a gain vector is generated to modify the control constants and optionally modify feedforward to adjust control signal into the flow control loop during transient operation of the level control valve.
Claims21
A level control system comprising:
- a level controller configured to use an integration parameter during non-transient operation to provide a control signal into a flow control loop controlling a level control valve for a liquid level in a boiler drum;
- a transient controller configured to identify a transient condition, interrupt the integration parameter, and generate a gain vector to modify the control signal into the flow control loop during transient operation of the level control valve.
A method of controlling a drum level, the method comprising:
- using an integration parameter during non-transient operation to provide a control signal into a flow control loop controlling a level control valve for a liquid level in a boiler drum;
- identifying a transient condition based on a predictive model of a boiler drum;
- interrupting the integration parameter based on the transient condition;
- generating a gain vector to modify the control signal into the flow control loop during transient operation of the level control valve;
- and,
- calculating a return condition for restoring the integration parameter and non-transient operation of the level control valve.
Dependencies are inferred from the claim text.