SVC supplementary controller for damping oscillations in power system

Abstract

Power system oscillations occur due to the lack of damping torque at the generators rotors. The oscillation of the generators rotors cause the oscillation of other power system variables such as bus voltage, bus frequency and transmission lines active and reactive power. Power system oscillations are usually in the range between 0.1 to 2 Hz depending on the number of generators involved in. They can be local or interarea oscillations. However, this project will focus on interarea oscillations only with the frequency range between 0.1 until 0.9 Hz. Flexible AC Transmission Systems (FACTS) got in the recent years a well-known term for higher controllability in power systems by means of power electronic devices. Several FACTS devices have been introduced for various applications worldwide. One of them is Static Var Compensator (SVC), which is a shunt device, provides dynamically variable shunt impedance to regulate the voltage at a bus where it is connected. Simulation of the case studies using SVC to show damping oscillations in the power system were done in Power System Analysis Toolbox. Moreover, location of SVC plays an important part to give effectively damped the oscillations. This project will discuss residue method to find the best placement of SVC for the case studies. Besides, the supplementary controller of SVC can be applied to improve the performance of damping oscillations in the power system. In this project, the supplementary controller for SVC is referred as proportional plus integral plus derivative controller. Lastly, a designing of SVC and supplementary controller to improve 10% of damping oscillations in the power systems is successfully designed.