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Background: Modern methods of regulator synthesis are often hard to realize technically as it is not easy to synthesize complex control devices. For example, input-output regulators are synthesized by the modal control method based on solving polynomial equations and employs pre-filters, the complexity of which is comparable with that of the regulators themselves. All this makes it quite urgent to develop an approach simplifying such control devices without affecting the qualitative parameters of the system as a whole. Materials and methods: The regulators have been synthesized by the polynomial synthesis method ensuring the required quality of the processes in an automatic control system by measuring only the output point of the control object. The reduction of control device is based on the method of equivalent structural transformations, which guaranties the permanence of automatic control system transfer function. And the astatism of control influence is ensured by the error coefficient method. Results: We propose a method of control device reduction based on implemention of the method of equivalent structural transformations, which essentially reduces the control device complexity. Unlike the known methods, this method does not require recalculating control device coefficients in order to preserve the performance indicators of the automatic control system. Conclusions: The proposed method reduces the order of the control device transfer function twofold, which makes the device much easier to implement. It also reduces the execution time of the control program, which is important when developing modern automatic control systems composed of objects with a high processing speed and short execution 1 Работа выполнена в рамках проектной части государственного задания Минобрнауки.  «Вестник ИГЭУ» Вып. 5 2017 г.  ФГБОУВО «Ивановский государственный энергетический университет имени В.И. Ленина» 45 time. The results of mathematical simulation have confirmed the identity of the performance indicators in the reduced system and the initial automatic control system in processing control and disturbance actions.

Reducing the dimension of control unit in the ACS synthesis by the polynomial method