Mathematical model and software for the simulation of a hydro generator behavior at the full load sudden disconnection

The paper presents a mathematical model and a computer program for determining the override parameters of the hydro generator and automatic voltage regulator (AVR) at the full load sudden disconnection: terminal voltage override of the generator, override time of 1,1U_gn, total response time or transient duration. Essentially the method consists in simulating the application of a negative step type perturbation at the AVR input stage equivalent to a full load sudden disconnection and in determining the override parameters. Further the paper presents an experimental test on the hydro generator from HPP Lereşti - Arges, causing a live full load sudden disconnection and determination of the same parameters. Finally, compare the experimental results and required values by international standards.