Analysis of Different Types of Power Circuits and Algorithms for Excitation Control of TVV-500 Turbogenerators of Nuclear Power Plants in Normal and Emergency Operating Regimes

Computer simulation tools are used for the analysis of competing designs of excitation systems of the high-power turbogenerators of nuclear power plants. Different variants in normal and emergency regimes are compared relative to field blanking time and the resulting overvoltages. It is shown that the particular variant of the power circuit has little effect on the length of time it takes to achieve complete de-excitation of the turbogenerators. Problems related to the power transitions of the field winding of a turbogenerator from the working to the standby excitation system and back are identified. The technology underlying automatic transition from a standby to a working excitation system is demonstrated.