Garaniuk P. Tiristor frequency transformers. The method of analysis of transient and steady-state operating mode

The thesis is dedicated to the elaboration of mathematical models of analysis of dynamic and quasiperiodic processes that flow in tiristor frequency transformers, which should take into account basic nonlinear characteristics of transformers, and hence is dedicated to creation on this basis of the method and computer programs of their computation. There have been developed mathematical models of tiristor frequency transformers, which are written down by the minimized number of the state differential equations in a normal form. There has been created the model of response to the initial conditions, which allows to perform the analysis of the periodic duties with the set in advance accuracy of convergence of iteration process and with the minimum expenditures of machine time. The method of application of -algorithm for the analysis of the quasiperiodic operation modes of frequency transformers is developed. The offered structure of one-phase - three-phase frequency transformer gives the possibility to get the circulating field, that substantially improves the mechanical characteristics during the frequency control of asynchronous motors.