Modelling and Tests, at Fessenheim Power Station of a 1080 MVA Turbogenerator and of its Excitation System

The studies and tests presented in this paper aim at a better knowledge of large turbogenerator behaviour and of their excitation systems relating to small disturbances, on account of ever more severe steady state stability problems. The tests on the 900 MW turbogenerator at FESSENHEIM nuclear power station, were performed using methods of frequency analysis and statistic correlation, and their objects were - checking excitation system performance - determining transfer function xd(p), xq(p), f(p) of the generator, during small disturbances superimposed to no-load and on-load operating conditions.