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.

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The article is devoted to improving the system of automatic control of modes of distribution electric networks containing solar power plants in order to achieve a simultaneous reduction of steady-state voltage deviations, voltage asymmetry at the terminals of consumers while maximizing the level of electricity generation by solar power plants. Ensuring normal permissible levels of electricity quality indicators in distribution networks is one of the most pressing issues that arise in the design and operation of modern distribution networks. Deterioration of the quality of electricity in electrical networks leads to the appearance of such negative phenomena, increase in additional losses in the elements of the electrical network, reduce the service life of electrical equipment, reduce the productivity of production equipment and others. The most significant negative impact on the functioning of the elements of electrical distribution networks, including electricity consumers, is observed with increasing levels of steady-state deviation and voltage asymmetry above the normative values. Modern solar inverters allow you to control the level of steady voltage deviation at the point of their connection to the mains. The design features of the construction of inverters of solar power plants allow them to change (within certain limits) not only the level of steady-state voltage deviation, but also to affect the level of voltage asymmetry and the parameters of the reactive power mode. In view of this, the task of improving automatic control systems for the distribution of electric networks with solar power plants, the implementation of which will take into account the multifunctional influence of solar inverters on the parameters of these networks is quite relevant. For the research, a fragment of a typical distribution electrical network with a nominal voltage of 10 kV was used, which contains a solar power plant that connects directly to the 10 kV busbars. The authors of the article set the problem of controlling the parameters of the mode of distribution electric network with solar power plants in the form of the problem of multicriteria optimization. An approach to solving this problem is also proposed, which is based on the method of solving problems of multicriteria optimization by approaching the utopian point in the space of criteria. Approximate calculations are carried out, which confirm the possibility of applying the proposed approach to the construction of systems for automatic control of the parameters of the mode of distribution electrical networks with solar power plants

The article is devoted to the study of improving the efficiency of the electric network with a voltage of 110-150 kV through the use of a developed device FKZ, which uses a radio channel to transmit information. At the present stage of development of electric power industry the question of reliability of work of high-voltage electric networks plays an important role. During the operation of such electrical networks, emergencies inevitably occur, the most dangerous of which are short circuits. Determining the location of damage to the electrical network is the most complex, time-consuming and time-consuming technological operation with significant costs. Therefore, the task of improving the design of devices to determine the location of damage, the use of which will significantly reduce the level of operating costs for electrical networks, is relevant. One of the ways to solve the problem of improving the accuracy of determining the location of a short circuit in the electrical network is the use of special technical means - short circuit clamps. The scheme of the normal regime of the 150 kV electric network of PJSC Kirovogradoblenergo was used for the research. The analysis of the configuration of this network showed that it has a number of substations that receive power from transmission lines, which are deaf branches. Therefore, the installation of short-circuit latches on such lines is necessary. The authors of the article propose the introduction of a radio channel to transmit information about the state of the network and the place of damage to the next personnel of the substation. The most appropriate ways to organize a radio channel are: the use of GSM networks; use of unlicensed frequency transmitters. Approximate calculations have been carried out, which confirm the possibility of creating a radio channel for transmitting information from the short-circuit lock for a distance of up to 20 km, using transceivers of non-licensed frequencies.