The paper provides an overview of spectral and modal analysis methods for studying the stability of electric power systems (EPSs) and their control. Consideration is given to theoretical grounds of the methods and to the experience of their application for detecting the heterogeneity of the systems’ structure, identifying the coherency of generators’ motion, simplifying the mathematical model of the dynamics of EPSs, assessing their small-signal stability, and selecting the control actions to ensure it. The analysis of sub-Gramians for studying the EPS stability and other new directions in the development of the modal approach are discussed.

We consider the symmetric components method on the direct, return, and zero sequences to define short circuit currents. We present methods and algorithms of synchronized phasor measurements and their application on digital substations. The proposed method of symmetrical components in direct, return, and zero sequences, widely used in short-circuit currents - for diagnostics of a digital substation’s electrical equipment

The principles of the implementation of the new network service - Protected Message Service (PMS) - intended for protected queries processing in the distributed information systems are considered. The essence of the approach consists in using Cryptographic Message Syntax (CMS) standard as a basis of protected data representation in the network.

The widespread use of new power electronic devices and the integration of renewable energy sources have increased the non-linearity and non-stationarity of modern electric power systems. Taking into account and modeling these nonlinear effects with sufficient accuracy requires the use of quadratic and higher order approximations of nonlinear power system models. However, sufficiently accurate bilinear models of synchronous machine are not easy to find in the literature. Therefore, in this paper we develop a quadratic approximation for the conventional sixth-order model of a synchronous machine using the Carleman bilinearization procedure. The developed bilinear model for one generator can further serve as a basic building block for constructing nonlinear approximations for general power system models.

The article describes the generalized process of creating a virtual simulator with an integrated geographic information system for modeling flight missions of unmanned aerial vehicles. The capabilities of the simulator allow forming flight missions for both single drones and their groups, and export data of completed missions to conduct real flights.