Design of Simulation Product for Stability of Electric Power System Using Power System Stabilizer and Optimal Control

This paper will discuss the use of optimal control and Power System Stabilizer
(PSS) in improving the oscillation of electric power system. Oscillations in the electric power
system can occur due to the sudden release of the load (Switcing-Off). The oscillation of an
unstable system for a long time causes the equipment to work in an interruption. To overcome
this problem, a control device is required that can work effectively in repairing the
oscillation.The power system is modeled from the Single Machine Infinite Bus Model (SMIB).
The state space equation is used to mathematically model SMIB. SMIB system which is a
plant will be formed togetherness state variables (State-Space), using riccati equation then
determined the optimal gain as controller plant. Plant is also controlled by Power Stabilizer
System using phase compensation method. Using Matlab Software based simulation will be
observed response of rotor speed change and rotor angle change for each of the two controlling
methods. Simulation results using the Simulink- MATLAB 6.1 software will compare the
analysis of the plant state in Open loop state and use the controller. The simulation response
shows that the optimal control and PSS can improve the stability of the power system in terms
of acceleration to achieve settling-time and Over Shoot improvement. From the results of both
methods are able to improve system performance