Analytical aggregation for generator and its excitation system using structure preserving technique

This paper presents an analytical aggregation method for generator and its excitation system using structure preserving technique. It exactly considers the voltage deviations resulted from aggregating generators moved to the common bus. The parameters of the equivalent generator and its excitation systems are calculated directly in a non-iterative way. And in this paper, excitation systems of different type can be aggregate to an equivalent one based on the structure preserving technique. Compared with traditional methods such as transfer function fittings in frequency domain and time domain simulation, the new method is more adaptive to different structures, complexities of generator and its control system. Various simulation results have demonstrated the correctness and effectiveness of this method.