The approximation of the plant's step response is still the most traditional way for plant's dynamics modeling. In the paper some methods for step responses approximation are examined. The aim of this examination is to make some conclusions about using the plant models for controllers tuning. The comparative analysis is based on examples and simulations.

In this paper on the basis of the power engineering approach, in analytical way, are obtained mathematical models, describing the dynamics of the flame-tube boilers that are manufactured and widely distributed in the notional decentralized power economy. There are included both the control and disturbances dynamical canals of steam and water ...