R Gholizadeh R. - Electrical Engineering Department- Faculty of Engineering-Azarbaijan University of Tarbiat Moallem
S Najafi R - Electrical Engineering Department- Faculty of Engineering-Azarbaijan University of Tarbiat Moallem
A Ajami - Electrical Engineering Department- Faculty of Engineering-Azarbaijan University of Tarbiat Moallem

In this paper design of HVDC current modulation controller for damping of electromechanical oscillations in a two-area test system is investigated. The selection of controller parameters is converted to an optimization problem with the multiobjective function which is solved by imperialist competitive algorithm (ICA). ICA is a new evolutionary algorithm that has a strong capability in finding the most optimistic results. The effectiveness and validity of the proposed controller on damping low frequency oscillations is tested through eigenvalue analysis and time domain simulation under two different disturbances which are applied simultaneously to the test system. The simulation results show that the tuned ICA based HVDC supplementary controller has an excellent capability in damping low frequency oscillations and enhances greatly the dynamic stability of the power system.

Imperialist Competitive Algorithm (ICA), Supplementary Controller, HVDC, Low Frequency Oscillations