DT-CWT and type-2 fuzzy-HSAPF for harmonic compensation in distribution system

Extensive utilization of power electronics in different applications injects harmonics into degrading the power quality. Harmonics can be eliminated in distribution systems using low-cost passive filters, but, they become bulky and complex in design with the increase in harmonic order. Hence, active power filters (APFs) are proposed as a voltage source converter (VSC) for providing better compensation, but active filtering is costly. To minimize such demerits, this article represents a hybrid shunt active power filter (HSAPF). For reference current calculation, dual-tree complex wavelet transform (DT-CWT) is used here and conventional proportional-integral (CPI), type-1 and type-2 fuzzy logic controllers (T1FLC and T2FLC) are employed for parameter optimization of HSAPF, to enhance the harmonic compensation ability and power factor. The case studies are performed in both simulations as well as real-time experimental setup using dSPACE, and it is analyzed that the proposed DT-CWT and type-2 fuzzy-based HSAPF provide better compensation performance in comparison to other controllers under different operating conditions.