Koctyukov V. Development and use of the method of circuit coefficients for the analysis of nonstationary regimes in electrotechnical systems

The thesis is devoted to the analysis of transition processes and nonstationary regimes in electrotechnical systems. The aim of the thesis is to develop a method of numerical and analytical study of nonstationary regimes and transition processes in electrotechnical AC and DC systems which allows to obtain process all the variables as well as the development of techniques of its application to a variety of electrotechnical systems. The expression of constants of integration of one of state variables (basic) through of the initial values of the state variables constituents was proposed which greatly simplifies the search for these constants of integration. In this paper models of the elements of electrical systems are adapted to the use of the method proposed. The existing methods of transition analysis were analyzed and criteria for the existence of transients processes were proposed. The techniques of this method for DC electrical systems: motors and electric drives, were proposed. The techniques are extended to the AC systems: synchronous generators, asynchronous motors, three phase and the magnetically coupled circuits. The application of the method of circuit coefficients to nonlinear systems and systems with variable parameters was shown.