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Abstract. Nowadays the modern power systems are large complex systems and widely distributed geographically. The increase in demand, generator reaching reactive power limits and line/generator outages may operate the power system in stressed conditions leads to voltage instability or voltage collapse. Voltage stability has become of major concern among the power utilities, because of several events of voltage collapse occurred in the past decade. Thus the real time voltage stability assessment is essential by estimating the loadability margin of the power system. Voltage stability analysis was studied on IEEE 30 and IEEE 118 bus systems using many voltage stability indices based on line/nodal and the results are compared with the proposed new index based on SVM and ELM.

Purpose The purpose of this study is to help the researchers, public, industries and government to realize the tremendous trends to improve the power quality of both sources and load side. Design/methodology/approach The work carried out in the Facts device and power quality issues. Findings Maintaining the quality of electric power is always a challenging task. The effect of power electronics devices leads to improper power quality. The use of FACTS devices is preferably the best approach to treat power-quality-related problems. Usually, all FACTS devices are constructed to operate on the side of either the source side or the load. Originality/value This paper explores a broad comprehensive study of various types of power quality problems and classification of FACTS devices with its recent developments. Furthermore unified power quality conditioner (UPQC) is particularly reviewed to highlight the advantages over other compensating devices. An exhaustive study of literature has been carried out and most significant concepts are presented