Three new direct synthesis methods providing new simple rules of tuning the Pseudo-Derivative Feedback controller for integrating as well as stable or unstable first order processes with time delay are presented. The proposed control structure and tuning methods ensure smooth closed-loop response to set-point changes, fast regulatory control and sufficient… (More)
In this paper an H -control technique is presented and applied to the design of optimal multirate-output controllers. The technique is based on multirate-output controllers (MROCs) having a multirate sampling mechanism with different sampling period in each measured output of the system. It relies mainly on the reduction , under appropriate conditions, of… (More)
In this paper, a new-control technique is proposed, in order to attenuate changes in the prime mover torque which degrade the performance of synchronous electric machines. The proposed technique relies on multirate-output controllers. Its main feature consists in reducing the original problem, to an associate discrete-control problem for which a fictitious… (More)
An optimal control strategy based on Two-Point-Multirate Controllers (TPMRCs), is used to design a desirable excitation controller of a hydrogenerator system, in order to enhance its dynamic stability characteristics. In the TPMRCs based scheme, the control is constrained to a certain piecewise constant signal, while each of the controlled plant outputs is… (More)
In this paper, the sixteen plants theory (SPT) is applied to a hydrogenerator system model, which incorporates parametric uncertainty, in order to design a robustly stabilizing PI controller, which enhances the stability characteristics of the plant over a variety of operating points.
This paper presents a new approach for tuning three-term control loops encountered in power station processes. The proposed approach is based on the Pseudo-Derivative Feedback (PDF) control configuration. Simple methods are presented for tuning the PDF controller for dead-time processes. The methods are based on appropriate manipulations of the exponential… (More)
After its original formulation in , the H ∞-optimization problem has drawn great attention (see e.g. - and the references cited therein). Several approaches have been reported in order to solve this important design problem for a variety of systems types. In particular, the H ∞-control problem for discrete-time and sampled-data singlerate and… (More)