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Two design methods for proportional-integral-derivative (PID) controllers are proposed based on the two-degrees-of-freedom (2-DOF) direct synthesis (DS) approach. One method specifies the closed-loop setpoint-to-output transfer function, and the other specifies the closed-loop disturbance-to-output transfer function. With appropriate DS, the 2-DOF controllers are approximated as a PID controller with...
In this paper, a direct synthesis approach is proposed to design ETF based multivariable decoupling controllers. This new scheme is different from two existing ETF based decoupling schemes which involves the following steps: (1) by uniquely determine the ETFs for every transfer function element, the inverse matrix of transfer function matrix is approximated; (2) selecting the desired closed-loop system...
This paper proposes simple analytic formulas for proportional-integral-derivative (PID) controller tuning for typical process models. The formulas are obtained in a similar way to the simple internal model control (SIMC) tuning rules, while the leading analysis is more delicate. Compared to SIMC counterparts, the new tuning formulas lead to better load disturbance rejection while giving similar setpoint...
The PID control algorithm commonly used in current domestic HVAC system. The difficulty status that the engineering staff encounter at the scene when they tune the parameter were given in this paper. A kind of handheld auto-tuning PID controller, based on frequency domain identification was designed, can identify online system model and give the best control parameters of the the current running system...
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