编号 5 (2023)

Heat supply is the most important area of energy services provided to a wide range of consumers. This industry determines the well-being of society, social stability and competitiveness of the economies of many countries of the world. The processes of energy liberalization that began in the early 1990s led to the emergence of new forms of heat supply management based on market interaction among producers and consumers of heat energy. In market conditions, the problem of optimizing heat supply systems becomes much more complicated, and its structuring becomes multivariate depending on the characteristics of the industry organization. To solve the problems of optimal functioning and development of heat supply systems in changing conditions, along with existing optimization methods, it becomes necessary to use new approaches focused on solving problems in some specific uncertain situations characterized by conflicting interests of the parties, and often defined as conflict. The paper presents a comprehensive scientific and methodological approach based on mathematical modeling for solving problems of managing the development and operation of heat supply systems in a market economy.

Identification of fault locations (FL) on overhead power lines (OHPL) in the shortest possible time allows to reduce the time for shutting down OHPL in case of damage. This helps to improve the reliability of power systems. FL devices on OHPL according to the emergency mode parameters (EMP) are widely used, as they have a lower cost. However, they have a larger error than FL devices that record traveling wave processes. Most of the well-known algorithms for FL on OHPL by EMP assume a uniform distribution of resistivity along the OHPL. In real conditions, this is not the case. Application of these algorithms in FL devices on OHPL with inhomogeneities leads to significant errors in calculating the distance to the fault location. The authors proposed the use of search algorithms for u-nconstrained one-dimensional optimization to increase the speed of implementation of iterative procedures in FL devices on OHPL by EMP. The authors have developed recommendations for choosing optimization criteria, as well as options for implementing computational procedures. Using the example of a two-sided FL on OHPL, it is shown that the use of search algorithms can significantly (from tens to hundreds of times) reduce the number of steps of the computational iterative procedure. The implementation of search algorithms is possible in the software of typical relay protection and automation terminals, without their hardware upgrade.