PSS Parameter Optimization Based on Comprehensive Damping Effect Method Aiming at Actual Grid Characteristics in Northern China

Table 3

PSS parameters of different phase-frequency ranges (unit: degree for phase-frequency range and 1 for others).

Phase-frequency range	T1	T2	T3	T4	Damping ratio
−70 to −135	0.31	0.05	0.59	0.06	0.1775
−75 to −135	0.2	0.04	0.69	0.05	0.1604
−80 to −135	0.15	0.04	0.7	0.04	0.1395