| Popis: |
Constructing a dynamic equivalent for a power system involves several steps: the partition of the system into coherent areas, the aggregation of coherent generator buses, and the aggregation of the coherent generators and their control devices. These steps have been discussed in previous chapters, including a method in Chap. 2 to aggregate the exciter models using frequency response. In this chapter, we investigate a trajectory sensitivity method to tune the aggregate exciter parameters of the equivalenced model. The optimal parameters of the aggregated exciter yielding the least error are used to evaluate the sensitivity technique against the aggregation method in the DYNRED program and a weighted MVA-based method. A three-machine system with one coherent area satisfying the theoretical coherency conditions is used to investigate the impact of the variations of the individual generator, network, and exciter parameters on the aggregate exciter model parameters. The technique is then applied to the exciter aggregation of a larger NPCC 48-machine system. |
