Static Voltage Stability Improvement with Embedded Statcom FACTS Controller

Abstract

The dissertation outlines the Modal analysis and V-Q sensitivity analysis as important techniques of static voltage stability analysis in power systems in order to check the system stability. Flexible AC transmission systems (FACTS) controllers are described alongside with their role in enhancing system performance. Static synchronous compensator (STATCOM) is discussed in detail as one of the most important shunt compensators. A 110 kV level of Sudan National electrical grid is implemented as case study. Modal analysis and V-Q sensitivity analysis are applied to the system in order to assess and evaluate its static voltage stability and also to determine the weakest buses that need to be compensated by using STATCOM. FACTS devices are very costly and need to be placed optimally in the system, Novel line stability index is used to identify the best locations of compensation devices. The system is analyzed at its base case then the weakest buses and areas are identified as well as the optimal locations of STATCOM to be implemented. A new study of the system is conducted after compensation. The results of the study show that STATCOM improves static voltage stability and enhances the system performance.