Study and performance analysis of various facts devices for reactive power compensation of a hybrid power system

Abstract

In the HPS, most common problems face as the reactive power and active power mismatch. The reactive power mismatch creates the stability issues in the HPS. The aim of the dissertation is to apply, analyze and compare the STATCOM device in the wind-diesel HPS scheme for better possible of system stability. The first approach deals with the PID controlled STATCOM in the wind-diesel HPS model. To study the behavior of the low frequency oscillations in the exciter of the wind-diesel HPS model, power system stabilizer (PSS) has been incorporated. In case of PID controller derivative mode improves the stability of the system but less capable to reduce the low frequency noises. In this regards, a low pass filter in derivative mode has been incorporated and the study has been performed. Synchronous generator faces low frequency oscillations (0.2-3.0 Hz) in the exciter which after sometimes occurs severe faults in the HPS. To damp out this low frequency oscillations, Posicast controller has been recommended in this studied. The effect of the studied model has been observed and compared with the Posicast controller in the exciter and with the combining effects of Posicast and PSS. Evolutionary optimization is much focused on this domain for the parameters optimization of the HPS model in recent years. The new optimization techniques are developed day by day with its different new features. Nature inspired algorithms are made much attention due to the excellent features in the process of optimization of the parameters. Symbiosis Organisms Search (SOS) based nature inspired technique is used to optimize the parameters of the wind-diesel HPS model parameters. SOS has the features of less own parameters than the others which take minimum time to run the program. ALO, BGA, SOA and many algorithm techniques are also intelligently applied in this HPS model and a fruitful comparative study has been done with SOS technique.