Damping of power system oscillations by using HVDC-based multi-modal POD controller

© 2018 IEEE. Due to the increasing replacement of conventional generators with renewable energy sources (RESs), the number of power system stabilizers (PSSs) installed in power systems may decrease in the future, resulting in a reduced capability to control power oscillations. This paper presents a multi-modal power oscillation damping (POD) controller that can improve the damping of multiple low-frequency oscillations. The controller is designed and installed in a proposed future High Voltage Direct Current (HVDC) transmission system modelled in a reduced order dynamic equivalent model of Great Britain (GB) system. The design process has been analyzed concerning variable time delays associated with communication systems used with wide-area measurements. MATLAB and DIgSILENT are used in the design and simulation of the controller. The multi-modal controller is shown to provide a significant improvement in damping of multiple modes of oscillations.