Application of a power system stabiliser and a static VAr controller to a multimachine power system

The author comments on the paper by C.H. Cheng and Y.-Y. Hsu (see ibid., vol.137, no.1, p.8-12, 1990). The author points to literature regarding the pole shifting technique. The generator transfer function identifier is also discussed. Y.-Y. Hsu replies to the comments made.