subsynchronous resonance; self-excited oscillations; series and shunt compensation in long lines; stability limit curves in two parametric plane; stability analysis; operational impedance; d-partition technique
A new mathematical mode.I is presented for analysis of self-excited oscillations in a synchronous machine connected to a long EHV transmission line with different configurations of series and shunt compensation. The model has been devel-oped in terms of line constants of long lines which includes the effect of line shunt susceptance and reactance of line end transformers. The model has been used to directly analyse self-excited oscillations in a transmission system for five types of compensation scheme. The stability limit curves in the R-X c parametric plane for the five compensation schemes have been compared with that for a series compensated transmission line.