About structurally-parametrical synthesis of regulators for automation of metallurgical furnaces

Introduction. The task of building high-quality systems for automatic control of technological processes in metallurgical and other industries is currently quite relevant, since a successful solution to this problem is directly related to the quality of products and production efficiency. Purpose of the study. Consider the problem of choosing the structure and settings of automatic regulators in relation to regulated areas with properties and characteristics that are observed, first of all, in metallurgical furnaces. Materials and methods. The article analyzes the current state of the problem, indicates the characteristic features of methods known in the literature for solving this problem, in particular, regulators with a model and with control by forecast. It is noted that it is necessary to find clear and non-ambiguous answers to many more questions of the seemingly already solved problem of choosing and tuning automatic regulators. Results. A method of structural-parametric synthesis of regulators based on the reference transfer function of a closed system is proposed, the choice of which is substantiated in detail in the work. It is indicated that the method gives unambiguous answers to questions about which regulator should be used for a given control object and what its settings should be. On the basis of the studies carried out by the authors, it is shown that the automatic control systems (ACS) designed in this way for metallurgical objects have the proper stability margins and an acceptable quality of transient processes. For the case of an unformalized choice of the type of controller from the PID family, procedures have been developed for the numerical optimization of its settings according to the differential equation of the control object, the parametric identification of which can be carried out both according to the experimental acceleration curve and according to the experimental transient function of the operating closed ACS. For control objects equipped with positional actuators, the replacement of which is often not profitable for one reason or another, the problem of numerical modeling and tuning of two-position and three-position automatic control systems has been solved. Conclusion. The results of the work can be used in the design of modern ATS in the metallurgical and other industries.