Abstract:
In power transmission system, low frequency oscillation (LFO) is created due to lack of balancing mechanical input to electrical output. For solving the LFO problem FACTs devices are being adopted. In this research work, as a FACTS device the Interline Power Flow Controller (IPFC) is employed. The IPFC based damping controller (Lead-Lag) has been used for mitigating LFO in single machine infinite bus (SMIB) system. An eigenvalue analysis is performed to select the electromechanical (EM) oscillation mode which is known as unstable mode. The controllability index is applied to select the most effective control signal of the controller. Since improper tuning of gain and time constants of controller called controller parameters may lead to sub-optimal result, particle swarm optimization (PSO) and differential evolution (DE) have been applied to tune the parameters. To investigate the effectiveness of the optimizers, the eigenvalue analysis and time-domain simulations are carried out. The quantitative analysis and nonparametric statistical tests have been performed to find out the most suitable optimizer for the controller. The results analysis reveals that the DE tuned Lead-Lag based damping controller for IPFC shows superior performance in damping LFOs for the study system.
