Power Oscillations Damping Through a Self-tuning Fuzzy Logic Damping Controller Integrated with a Static Synchronous Series Compensator

Abstract

Power oscillations such as low frequency oscillations (LFO) are a common adverse experience in power systems which may result in
instability problems and hence reduce the total and available transfer capability. It is well recognized that utilizing the flexible ac
transmission systems (FACTS) technology yields different improvements in the power system such as better damping of electromechanical
oscillations. This paper investigates the damping performance of the static synchronous series compensator (SSSC) equipped with a selftuning fuzzy logic  damping controller (STFLDC). At the outset, a modified Heffron-Phillips model of a single machine infinite bus (SMIB)system integrated with SSSC is established.
In the following, well performance of the fuzzy logic damping controller (FLDC) rather than theconventional classic one is scrutinized. To be tolerant with
the operating points changing, another fuzzy logic controller (FLC) which acts as the tuning controller is supplemented in the control loop. The tuning controller is designed such that in the case of severe disturbances, it will tune the output scaling factor to result in a better damping performance. Simulation studies validate the effective performance of the developed STFLDC in damping electromechanical oscillations which results in a robust and reliable one.