The paper considers problems pertaining to mathematical modeling of a transformer substation with protected electric power lines. It is proposed to use systems of dynamic modeling for investigations applying a method of calculative experiment with the purpose to evaluate behavior of protection and automation at short circuits. The paper contains comparison of results obtained with the help of program-simulated complex on the basis of a complex mathematical model of an object and with the help of dynamic modeling system – MathLab.

The paper investigates an operation of a self-oscillatory asynchronous electric drive with impact loading in the form of a bell. A mathematical model of the electric drive and a circuit of winding connection of the asynchronous engine for its operation in a self-oscillatory mode have been developed in the paper. Analytical investigation of the mathematical model has been carried out and time diagrams of bell bowl and tongue movement have been constructed.

A numerical method for calculation of open-air substations’ flexible bus-bars dynamic at short-circuit has been improved on equations of a flexible elastic string with application of an implicit scheme. On the basis of the numerical method a computer program FLEBUS for calculation of substations’ flexible bus-bars dynamic at short-circuit has been developed. An approbation and an estimation of calculation result reliability have been carried out in accordance with the program while using experimental data. On the basis of the obtained information it is possible to assert that the developed program is an independent tool for calculation of electrodynamic stability of substations’ flexible bus-bars.

The paper is devoted to computational investigation of influence relative time constant of an object which changes in broad band on quality of steam temperature control behind a boiler with due account of value of regulating action in the system with PI- and PID- regulator. The simulation has been based on a single-loop automatic control system (ACS). It has been revealed that the less value of the relative time constant of an object leads to more integral control error in system with PID- regulator while operating external ACS perturbation. Decrease of numerical value of relative time constant of an object while operating external perturbation causes decrease of relative time concerning appearance of maximum dynamic control error from common relative control time.

The paper considers peculiar features of thermochemical decomposition of peat as a result of quick pyrolysis. Evaluation of energy and economic expediency of the preliminary peat decomposition process for obtaining liquid and gaseous products has been made in the paper. The paper reveals prospects pertaining to application of the given technology while generating electric power and heat.

The paper considers necessity and possibility of a transformation of polluted territories of Belarus, the Ukraine and Russia to ecologically-safe systems by radionuclides, actinoids and hot particles. The real possibility of the problem solution while applying special plants-hyper-accumulator is shown in the paper.

The paper considers a thermodynamic efficiency and peculiar features pertaining to realization of heat-recovery steam-gas plant schemes with steam reheating. Possible reserves of higher efficiency concerning plant economy and methods for achieving these goals are given in the paper. The author has made calculations for steam-gas plants of one-, two- and three-loop cycle of steam pressure. An analysis of the obtained results in respect of technical and economic indices and expediency of the application of corresponding plants in power engineering of the Republic of Belarus are presented in the paper.