Line sensitivity analysis with respect to line outage and load variation / Hairul Haizam Harun

Voltage stability problems have been one of the major concerns by the electric utilities as a result of heavy loading. Many researches have been conducted concerning to the voltage stability condition in a power system. It is done to ensure that the system operates in a safe condition and necessary precautions can be taken against the voltage collapse. Research has shown that, contingency problem resulted by line outage and load increased was identified as one of the contributors to voltage instability in a power system. Hence, voltage stability assessment is important for power system planning and operation to ensure the system can withstand from any contingency that would affect the customer service. There are many methods to access the voltage stability condition in a power system. One of the assessment methods which are normally used is sensitivity analysis technique. This project presents the development of sensitivity analysis technique to access the voltage stability condition in a power system. It is based on the assessment of sensitivity of the line with respect to the line outage and individual bus load variation. The information from the line sensitivity analysis can be used to assess the voltage stability condition in a power system. As a result, the most sensitive line that would cause voltage instability can be determined. In this research, Normalise Sensitivity Index (NSI) was developed and used to check the sensitivity of each line with respect to the line outage and individual bus load variation. All the analysis was done on the IEEE 30-bus reliability test system and static stability analysis was considered in this research. The result shows that this technique is capable to predict the most sensitive line in the system due to line outage and individual bus load variation.