Method and a system for tuning multivariable pid controller
AssigneeABB Research Ltd.
InventorArun GUPTA
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Abstract
A method and system are disclosed for tuning a Multivariable Proportional-Integral-Derivative (PID) controller in a process plant. The plant can have at least one PID controller for controlling the processes of the plant. The method can include formulating Model Predictive Control (MPC) for the process model of the plant; obtaining a desired (e.g., optimal control) solution for at least one designated (e.g., critical) region in relation to the MPC; determining PID tuning parameters corresponding to the control solution; and tuning the PID controller with the PID tuning parameters.
Claims17
A method for tuning an adaptive Multivariable Proportional-Integral-Derivative (PID) controller in a plant using a Model Predictive Control (MPC), the method comprising:
- formulating the MPC for a process model of the plant;
- obtaining an affine control solution for at least one designated region, in relation to the MPC;
- obtaining a transfer function for mapping the affine control solution to one or more equivalent PID tuning parameters;
- determining the one or more equivalent PID tuning parameters corresponding to the affine control solution using the obtained transfer function;
- and
- tuning the adaptive Multivariable PID controller with the one or more equivalent PID tuning parameters to control the plant in the at least one designated region.
A system for tuning an adaptive Multivariable Proportional-Integral-Derivative (PID) controller, the system comprising:
- a process model for a plant to be controlled;
- a Model Predictive Control (MPC) module for formulating MPC for the process model;
- an optimizing module for obtaining an affine control solution and a transfer function, and for determining one or more equivalent PID tuning parameters thereof;
- and
- a tuning module for tuning the adaptive Multivariable PID controller with the one or more equivalent PID tuning parameters.
The system as claimed in claim 12, wherein the adaptive multivariable PID controller includes adaptive gain in relation to the one or more equivalent PID tuning parameters and their corresponding designated region.
Dependencies are inferred from the claim text.