A Quantitative Fvaluation Method for Dynamic Equivalence Based on Prony Algorithm

A quantitative evaluation method for dynamic equivalence in power System using prony algorithm is presented, and art equivalence error index calculated by the prony analysis result of transient response in original and equivalent system is defined to quantitatively describe the accuracy of dynamic equivalence. Before that, a practical method to aggregate generators which involves selecting the largest capacity one as the dominant generator of a group and modifying the reactance parameters using single variable optimization is presented to prove the effectiveness of proposed quantitative evaluation method on account of the apparent difference before and after modifying. Choosing IEEE39 power system as the original system to he reduced, transient simulation results verify the accuracy and reliability of the quantitative evaluation method proposed in this paper.