This paper indicates the optimal use of the UPFC in various works and research areas. It have been seen in last few years that UPFC has taken a tremendous and invariant place in the family of FACTS devices. UPFC helps to determine control and stability parameters of power quality process. Power balance equation, Power flow graph, Reactive power compensation these are some kinds of parameters which are mainly discussed in the paper which is basically based on the deep study of the UPFC devices is used in how many effective ways and up to which level can be taken to further studies.