comparison between SVC and TCSC compenstors on power system performance

This thesis has presented an evaluation study on series and shunt compensators for power system oscillation damping. The study compared the performance of PI-SVC and PI-TCSC controllers on single and multi-machine power systems. The SVC and TCSC gains have been determined using pole placement technique to improve the damping of the mechanical oscillation by shifting the associated eigen-value to a desirable locations.6.1 Conclusions of This Thesis1. This thesis introduced a detailed analysis of SVC and TCSC models as damping controllers, and how these models can be linked to the dynamic models of both single machine infinite bus as well as multi-machine power systems.2. SVC and TCSC with supplementary signal in their loop can effectively mitigate power system oscillations and improve system stability. The system behaves better with closed loop controller than the open loop one in either SVC or TCSC.3. Simulation results show that PI-SVC and PI-TCSC with its gain settling updated in real time by the pole placement can provide good damping for the power system over a wide range of load models significantly improve the dynamic performance of the system.4. The controller response either TCSC or SVC mainly depend on the tested system. Simulation results show the superiority of the TCSC over SVC in enhancing system damping beside controlling power flow in the SMIB system and in a two area multi-machine system, where in the nine bus system the performance of the shunt controller is better than in series one.5. This thesis demonstrated that SVC and TCSC controllers, appropriately tuned make them a valuable alternative to exchange the network. However, an over all cost benefit analysis would be necessary for a specific application for oscillation control combined with other application aspects, such as voltage and power flow control, give their high relatively costs of FACTS controllers when compared to other controllers.6.2 The Future Workfrom the results achieved throughout the work of this thesis, the following points can be investigated.1. In this thesis, the damping control strategy for SVC and TCSC have been proposed and implemented by using PI controller based on pole placement technique. However, there still room for further improvement techniques, such as linear optimal control and H-infinitive control algorithms.2. Study another types of FACTS devices like STATCOM and UPFC and try to make coordination between these devices to enhance power system operations and control.3. Study the effect of FACTS devices on other power system phenomena such as voltage stability and power quality.