Authors : C. Subramani , Subhransu Sekhar Dash and M. Jagadeeshkumar
Abstract: Voltage instability is a Phenomenon that could happen in a power system due to stressed condition. The result would be the occurrence of voltage collapse which leads to total blackout of the whole system. Therefore, voltage collapse prediction is important in power system planning and operation so that the occurrence of voltage collapse due to voltage instability could be avoided. Line outage in a power system could also, lead to the event of the voltage collapse which implies the contingency in the system. Contingency problem caused by line outage has been identified as one of the main reason to voltage instability in power system. This study presents, a new technique for contingency ranking based on voltage stability condition in power system. A new line stability index was formulated and used to identify the critical line outages and sensitive lines in the system. The line outage contingency ranking was performed on several loading condition in order to identify the effect of increase in loading to the critical line outages. Correlation study on the results obtained from contingency ranking and voltage stability analysis were also, conducted and it is found that line outages at the weak lines would cause voltage instability condition to a system. Subsequently, using the result from the contingency ranking weak areas in the system can be identified. The proposed contingency ranking technique was tested on IEEE reliability test system.
C. Subramani , Subhransu Sekhar Dash and M. Jagadeeshkumar , 2009. Voltage Stability Based Collapse Prediction and Weak Cluster Identification. International Journal of Electrical and Power Engineering, 3: 124-128.