Sheina A. Improvement of turbogenerators mathematical model for analysis of sudden short circuit modes in consideration of saturation

Object of research – electromagnetic transient processes in turbogenerators at sudden three-phase short-circuits. Aim of research – increasing of analysis accuracy of electromagnetic transient processes in turbogenerators at sudden three-phase short-circuits by means of improvement of their mathematical models in the direction of taking into account as the multi-loops massive rotors as the magnetic saturation of flux linkage ways. Theoretical researches are based on theory of complex- operator analytical description of transient processes; methods of mathematical modeling by differential equations, and also methods of mathematical analysis, founded on Laplace transformation properties and Fourier integral. A new approach for experimental determination of frequency-response characteristics from direction of stator on the experiments of sudden three-phase short circuits is proposed. A method was worked out for determination of exciting winding and turbogenerator massive rotor electromagnetic parameters for the equivalent circuit with different mutual inductive magnetic connection among loops. The generalized analytical dependences of equivalent circuit parameters for turbogenerator ТВВ series on initial value of periodic current component of sudden short circuit, which reflected the magnetic saturation of flux linkage way, were received. Modelling method of electromagnetic transient process at three-phase short circuit with taking into account saturation for equivalent circuit with different magnetic connection among loops and multi-loops massive rotor, was improved. A method of elaborated frequency-response characteristics determination of synchronous machines on experiments data of sudden three-phase short circuit was taken to use on state enterprise - "Heavy electrical mechanical engineering" in Xarkov. Branch - electromechanics.