Abstract
Problem statement: Estimating the margin in the loadability of the power system is essential in the real time voltage stability assessment. Voltage stability is currently one of the most important research areas in the field of electrical power system. In power system operation unpredictable events is termed as contingency and may be caused by line outage in the system which could lead to entire system instability. Voltage stability analysis and contingency analysis are would be performed in a power system by evaluating the derived voltage stability index. Approach: Voltage Stability Index Lmn can be useful for estimating the distance from the current operating point to voltage collapse point. The index can either reveal the critical bus of a power system or the stability of each line connected between two buses in an interconnected network or evaluate the voltage stability margins of a system. Results: Flexible Alternating Current Transmission Systems (FACTS) devices have been proposed as an effective solution for controlling power flow and regulating bus voltage in electrical power systems, resulting in an increased transfer capability, low system losses and improved stability. However to what extent the performance of FACTS devices can be brought out highly depends upon the location and the parameters of these devices. Unified Power Flow Controller (UPFC) is the most promising FACTS device for power flow control. Conclusion/Recommendations: The performance of this index is presented and the effectiveness of the analyzed methods is demonstrated through simulation studies in IEEE 14 bus reliability test systems.
Highlights
Due to ever increasing load demand, power utilities are forced to increase the utilization of existing transmission facilities
The main cause of voltage collapse may be due to the inability of the power system to supply the reactive power or an excessive absorption of the reactive power by the system itself
Finding a voltage stability index has become an important task for voltage stability studies
Summary
Due to ever increasing load demand, power utilities are forced to increase the utilization of existing transmission facilities. Corresponding Author: Subramani, C., Department of EEE, SRM University Chennai, Tamilnadu, India 585 These indices provide reliable information about investigation of the system constraints and their effects proximity of voltage instability in a power system. The following factors can be considered in the selection of increase damping of power system whereas the system the optimal installation and the optimal parameters setting with coordination of a STATCOM and a SSSC of multiple UPFCs: The topology of the system, the provides the best results of stability improvement stability margin improvement, the power transmission (Kumkratug, 2011). This study introduces the application of line Problem statement and stability index: The purpose stability index for the optimal allocation multiple shunt of Lmn is to determine the point of voltage instability, FACTS devices: Unified Power Flow Controller the weakest bus in the system and the critical line (UPFC), in order to improve voltage profile, referred to a bus. The value of Lmn close to 1.00 indicates that the particular line is close to its instability point which may lead to voltage collapse in the entire system
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