Ways for the use of energy storage systems (ESS) in electrical networks are considered. The formalization of the general approach to solving the problems of efficient use of ESS in electrical networks is performed. The article shows the mathematical models for evaluating the effectiveness of using ESS and determination of the ESS optimal configuration, including regulation modes of electric networks. The operation of the electrical network with an connected group of four ESS is considered. The standard IEEE 33-node 12.6 kV network was used as a base model. A new target function has been proposed. This function is based on the benefit of installing the ESS and consists of the annual cost of buying / selling electricity by ESS, the annual cost of reducing active losses in the electricity grid due to the operation of the ESS and the corresponding investment costs. The results of optimization calculations using the proposed objective function are given. A comparative analysis of the obtained results was performed. The estimation of the components of the function of the benefit of using ESS under the condition of elimination of deviations of voltage levels in separate nodes of the electric network from the normalized values is performed. References 33, figures 2, tables 2.

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Scientific developments, which have been implemented as mandatory to provide a synchronous operation of IPS of Ukraine with the Continental European Power System ENTSO-E are presented. Firstly, it concerns a new level of information maintenance that has been realized by the creation and implementation of a wide range of specialized devices. The features of the construction of information-diagnostic devices are determined. The systems focused on the use of active elements, such as devices and technologies to provide flexible changes in network characteristics, as well as the implementation of electricity conversion to optimize their operation regimes are considered. A special attention was paid to providing a stable operation of the Ukrainian power system, including voltage stability. It covers tools and technologies used to create flexible AC transmission lines. The scenarios for eliminating a major system breakdown with an active power deficit of 1000 MW and other scenarios have been studied. The ways of further research on the development of IPS of Ukraine in the postwar period at the first stages of synchronous operation with ENTSO-E are identified. The paper identifies priority measures and tools aimed to improve the survivability and reliable control of the Ukrainian power system, development of principles and means of adaptation and reconstruction of emergency automatic control of electrical regimes and stability, creating prerequisites for digitalization of the power system. References 35, figures 2.

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