Barna Pongrácz

Constrained control of a low power industrial gas turbine based on input-output linearization

A constrained linear optimal control for a low-power industrial gas turbine based on input-output linearization is proposed in this paper. It uses a nonlinear state space model of the gas turbine in input-affine form based on first engineering principles. According to the control aims the nonlinear model is input-output linearized and an LQ servo controller is developed for the linearized model. We have some additional constraints on the state and input variables of the closed-loop plant fed back by the LQ servo controller. These constraints can be kept in a simple way designing an MPT-controller. The complete control structure is investigated by simulation studies.

An algorithm for determining a class of invariants in quasi-polynomial systems

In this paper an algorithm is proposed for the retrieval of a wide class of invariants in quasi-polynomial systems. The invariance properties of the algorithm under different transformations are discussed. The application of the algorithm is illustrated on physical and numerical examples. The algorithm has been implemented in the MATLAB computing environment.