Progressing of the demand for electrical energy
leads to loading the transmission system close to their limits
which may leads to LFO happening. Low frequency oscillations
(LFO) in power system usually happen because of lack of
damping torque to overcome disturbances in power system
such as changes in mechanical power. Due to the existence of
the low frequency oscillation (LFO), the transmission power of
AC lines is limited and the system angle stability is affected. In
this paper the Parameters of the classic PSS and SVC internal
AC and DC voltage controllers are designed in order to damp
the Low Frequency Oscillations (LFO). The design of PSS and
SVC parameters is considered as an optimization problem and
Hybrid Particle Swarm Optimization (PSO) and Genetic
Algorithm (GA) are used for searching optimized parameters.
The results of the simulation show that the SVC with PID
controllers is more effective in damping LFO compared to PSS
with PID controllers.
