UPQC consists of two voltage source converter (VSC), known as series VSC and shunt VSC. By placing shunt VSC about series VSC, the UPQC topology can be classified. If parallel connected VSC is situated to the left part of the series connected VSC, then UPQC topology is named as UPQC-L and if parallel connected VSC is situated to the right part of the series connected VSC, then UPQC topology is named as UPQC-R. Here, the two topologies of UPQC such as UPQC-L and UPQC-R with their performances are examined in terms of power quality improvement. Conservative PI and SRF theory control approaches are employed for both the UPQC topologies. These UPQC topologies have been modeled in MATLAB/SIMULINK background of sim power devices under non-linear load circumstances. On comparison of % THD in supply current and load voltage for the UPQC-L and UPQC-R system topologies, it has been found that UPQC-R topology illustrates less % THD which indicates superior aspects in terms of power quality improvement.