Analysis of Fuzzy Logic Based Interline Unified Power Quality Conditioner for Grid Voltage Regulation of Critical Load Bus

This paper focuses on an innovative topology of FACTS device, namely UPQC whose nomenclature is interline UPQC (IUPQC). The new topology of iUPQC includes all previous topology functionalities, including the voltage regulation at the load-side bus, and now providing also voltage regulation at the grid-side bus, like a STATCOM to the grid. The new equipment is only a mere extension of the existing FACTS device features like Distributed Static Compensator which does not limit to better voltage regulation at the gird side as well as load side bus. In iUPQC; Series Active Filter (SAF) works as a current source and Parallel Active Filter (PAF) works as a voltage source and due to these there is a high and low impedances occurs which is indirectly compensates the harmonics and disturbances of the grid voltage and load current and also impedance path is low harmonic at load current. The main difference between these compensators is the sort of source emulated by the series and shunt power converters. The structure, control and capability of the IUPQC are discussed in this paper with the fuzzy logic controller. The efficiency of the proposed configuration has been verified through simulation studies using MATLAB/Simulink.