DESIGN OF PMU BASED REAL TIME FUZZY LOGIC SVC DAMPING CONTROLLER TO ENHANCE INTER- AREA OSCILLATION DAMPING

Abstract

Inter-area oscillation has been identified as a significant problem in the utility systems due to the damages that it may cause as well as the limitation introduced to power transfer capability. A contemporary solution to this issue is by adding power system stabilizer (PSS) to the generator's automatic voltage regulator (AVR). Although nowadays most of the generators are equipped with conventional PSSs, their effects are only noticed on the damping of local oscillations and they do not contribute effectively on damping the inter-area oscillations. Adding auxiliary signals (stabilizing signals) to Flexible AC Transmission System (FACTS) device such as Static VAr Compensator (SVC)&Static Synchronous Compensator (STATCOM) would help in extending the power transfer capability and enhancing the voltage. The stabilizing signals can be derived from damping controller. In this thesis, a Phasor Measurement Unit (PMU) based real-time, Hardware in the Loop, fuzzy logic shunt FACTS controller is proposed to ensure a satisfactory damping of inter-area oscillations which will enhance system stability and increase power transfer capability. The concerned power system has been modeled using Real-Time Digital Simulator (RTDS), where the designed Hardware-in-the-loop damping controller was tested for the sake of evaluating the effectiveness of the proposed controller in enhancing the damping of inter-area oscillations. Time-domain simulations results have shown that the designed Fuzzy damping controller enhance the damping of inter-area oscillations of interconnected power system. This study is aimed to analyze the potential applications of PMU in the interconnected power systems of GCC smart power grid. These systems are expected to face a stability problem of the inter-area mode of oscillations due to the weak tie-lines that connect the systems.