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Relevance Improving the quality of control of dynamic processes in electric power systems involves the widespread introduction of optimal control methods implemented using computer and microprocessor technology. The efficiency of optimal control essentially depends on the class of the mathematical model that describes the processes in electric power systems. The use of power system models of a high accuracy class for choosing control laws does not allow real-time correction of system modes due to the large amount of calculation of the parameters of the optimal controller and insufficient convergence of computational processes. Having a Z-transfer function, it is not difficult to compose difference equations, the very record of which contains an algorithm that is easily programmable on a digital computer, which can ensure the accuracy of the solution for choosing optimal controllers. Aim of research The aim of the work is to apply the algorithm for the functioning of a typical branch of an automated information control system. Research methods For research, the VisSim software environment was used, which, unlike MATLAB, does not require expensive software. VisSim is freely available in the scientific community. To study the effects of frequency fluctuations on the rectified voltage of closed valve systems, the LAFC and LPFC methods were used in combination with the theory of random processes. Results From the point of view of the implementation of the signal processing algorithm, the numerical solutions of differential and difference equations are similar. But the representation and description of a link or fragment of the amplitude-pulse ACS in the form of difference equations allows using, along with models of physical ACS devices, also algorithmic blocks, the functions of which are performed by digital processors.