The Discrete Load Frequency Control System Using a Robust Periodic Output Feedback Controller

Table 1

Modal analysis without the PSS and with the PSS and POF controller.

Cases	Mode
	Mode-1		Mode-2		Mode-3
	Freq. (Hz)	Damp. Factor (δ)	Freq. (Hz)	δ	Freq. (Hz)	δ
Without PSS	0.1281	0.9345	0.2335	0.4643	0.4496	0.1945
PSS	0.1011	0.9613	0.0952	0.8941	0.4135	0.3044
POF	0.0251	0.9874	0.0203	0.9913	0.0033	0.9997