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Purpose. Enhancement of the efficiency of the electrical distribution networks with rated voltage of up to 1 kV by improving automatic control systems for the parameters of the mode of electrical distribution networks with sym­ metrical compensating devices under conditions of voltages unbalance. methodology. Multicriterion optimization methods were used in solving the problem of controlling the parame­ ters of the mode of electrical distribution networks. The Nelder­Mead numerical optimization method was used to find the final solution of the problem of multicriteria optimization. Using the methods of computer simulation, the efficiency of the automatic control system proposed in the work was evaluated. Findings. The advantage of the proposed method for controlling the parameters of the mode of electrical distri­ bution networks with symmetric compensating devices over existing ones is proved, because additional criteria, levels of steady stress deviation, are taken into account in the formulation of the control task. The results of com­ puter simulation of the automatic control system, based on the method proposed in the paper, confirmed the results of theoretical studies: the developed automatic control system, in contrast to existing ones, performs such control actions, at which the levels of asymmetry and steady­state stress deviations are observed which do not exceed nor­ mally admissible ones. Originality. For the first time, the solutions of the multicriteria optimization problem were obtained by the meth­ od of approaching the Utopian point in the space of criteria for determining the rules for automatic phase­by­phase variation of the reactance of symmetric compensating devices, the application of which allows simultaneous reduc­ tion of consumption levels of reactive capacity, asymmetry levels and steady­state voltage deviations in electrical distribution networks with a nominal voltage of up to 1 kV. Practical value. The computer model of the automatic control system of the parameters of the mode of electrical distribution networks with a nominal voltage of up to 1 kV gives possibility to analyze the modes of these networks using it. Also, with the help of this computer model, the process of setting up a microprocessor automatic control system is essentially simplified ­ based on the method of automatic control of the parameters of the mode of electrical distribution networks proposed in the work.

Automatic control of electrical distribution network mode with the voltage unbalance