Modeling and analysis of a nonlinear adaptive filter control for interline unified power quality conditioner

In this paper, one of the known interline custom power devices named Interline Unified Power Quality Conditioner (IUPQC) is improved for various power quality disturbances and modeled in PSCAD/EMTDC. The developed topology can be used for simultaneous compensation of voltage and current imperfections in a multibus/multifeeder system. The proposed IUPQC is designed for medium voltage level (11 kV) and effective Enhanced Phase Locked Loop (EPLL) based control technique is used to detect and extract the PQ disturbances. The performance of Series Compensator of IUPQC is evaluated through extensive simulations for mitigating unbalanced voltage sags with phase jumps and interruption. The performance of Shunt Compensator of IUPQC is also tested for harmonic and reactive power compensation that are not investigated before in literature. It is verified that IUPQC which is connected to two feeders, can compensate current and voltage distortions succesfully in these feeders according to the results obtained using PSCAD/EMTDC.