多変数制御を適用した励磁制御系による系統安定度向上

抄録

Improvement of power system stability is the most important issue of generator excitation control. The combination of thyrister excitation with ΔP-PSS is usually applied to recently installed very large turbogenerators. This PSS is not always effective for wide-range operation of generators or for various changes of power system line impedance. The application of the optimal control theory, especially the multi-feedback signal resulting from the Riccati equation has been studied and reported by many papers. These papers, however, do not clearly describe how to set performance index values, and the studies reported in them also use inadequate signals. This paper presents a method to set the performance index values to make adequate feedback signals for selecting actual control on the application of Riccati equation. Also, the deve-loped PSS using multi-feedback signals is applied to actual very large turbo-generators after confirming