An impact of influence of power system operating condition over different type of PSS in a SMIB

Low frequency oscillations in power systems are one of the major barriers to improve the dynamic performance of power systems. To ensure the effectiveness of these stabilizers the design of stabilizer should be robust over a wide range of power system operation conditions. In this paper, the comparison of three different stabilizers (PSS, BESS active power and BESS reactive power) is presented using Eigen value analysis in an SMIB. All stabilizers employ phase compensation method for parameter designs. The effectiveness of these stabilizers is demonstrated through a non-linear time domain simulation over a wide range of power system operating conditions that influences the parameter of transmission line. The simulation study shows that at light loading both BESS base active and reactive power stabilizers are least effective as compared to PSS. However, as the power system operating condition changes only BESS active power stabilizer provides robustness. Its Eigen value doesn’t show a significant change. It was found that BESS reactive power is more effective when it operates at higher operating conditions. It provides more damping to power system which helps to suppress low frequency oscillations effectively. In contrast, the performance of PSS decreases with increase in the loading, it provides less damping at higher loadings. Moreover, BESS active and reactive power stabilizers were found to be more effective as length of transmission line increase while PSS effectiveness decreases with increase in length of transmission line.