AGGREGATION OF EXCITER MODELS FOR CONSTRUCTING POWER-SYSTEM DYNAMIC EQUIVALENTS

Constructing a dynamic equivalent for a power system involves several steps: the partition of the system involves several steps: the partiti on of the system into coherent areas, the coherent area aggregation ex citer models. A trajectory sensitivity method is used to tune the aggr egate exciter parameters of the reduced models. The optimal results ar e used to evaluate the aggregation from the DYNRED program and a weigh ted the aggregation from the DYNRED program and a weighted MVA based m ethod. A three-machine system with one coherent area satisfying the th eoretical coherency conditions is used to investigate the impact of th e variations of the individual generator, network, and excimer paramet ers on the aggregate exciter model parameters. The results are then ap plied to the exciter aggregation of a larger 48-machine system.