05-07-2012, 12:08 PM
Thyristor Controlled Series Compensator (TCSC)
is a prominent Flexible AC Transmission System (FACTS) device. It can control the transmission line impedance quickly and widely. It results in significant improvement for both power system steady state and dynamic issues. The goal of this thesis is to design a TCSC controller to damp interarea oscillations in a power system. A traditional controller design method, called the residue method, used to design power system stabilizers (PSS), is used to design the TCSC controller. The controller designed by this method yields good damping results. This method, along with modal sensitivities, is also used to indicate the effectiveness of various TCSC locations. The performance of TCSC and PSS controllers are compared for different static load modeling. The results indicate that TCSC has great influence on both interarea modes of the sample system relative to the influence of PSS. Also TCSC has the potential to improve one interarea mode and degrade the other. This suggests that controller robustness is of greater concern with TCSC than with traditional power system controllers. To account for this, the uncertainties in static load modeling are modeled into structured uncertainties, and we utilize the [mu] analysis and synthesis to design a robust TCSC controller. This controller has low order and can work well under different static load modeling. This controller design scheme is practical in the sense that it can adapt to a wider range of system parameters without increasing too much in complexity.
is a prominent Flexible AC Transmission System (FACTS) device. It can control the transmission line impedance quickly and widely. It results in significant improvement for both power system steady state and dynamic issues. The goal of this thesis is to design a TCSC controller to damp interarea oscillations in a power system. A traditional controller design method, called the residue method, used to design power system stabilizers (PSS), is used to design the TCSC controller. The controller designed by this method yields good damping results. This method, along with modal sensitivities, is also used to indicate the effectiveness of various TCSC locations. The performance of TCSC and PSS controllers are compared for different static load modeling. The results indicate that TCSC has great influence on both interarea modes of the sample system relative to the influence of PSS. Also TCSC has the potential to improve one interarea mode and degrade the other. This suggests that controller robustness is of greater concern with TCSC than with traditional power system controllers. To account for this, the uncertainties in static load modeling are modeled into structured uncertainties, and we utilize the [mu] analysis and synthesis to design a robust TCSC controller. This controller has low order and can work well under different static load modeling. This controller design scheme is practical in the sense that it can adapt to a wider range of system parameters without increasing too much in complexity.