A fuzzy logic-oriented action for improving power quality in grid-integrated wind power system for non-linear loads

The article deals with the design of a fuzzy logic controller (FLC) for a grid-integrated wind energy conversion system feeding a non-linear load. The proposed system consists of the following components: a wind turbine, a battery energy storage system (BESS), and a conventional alternating source, which are integrated with the grid to feed the non-linear load. It begins with maximum extraction from the wind turbine to meet the load requirement. The wind turbine output and conventional alternating supply are directly connected to the AC grid, but BESS is connected to the same grid through an inverter. Further, the switching of the inverter has been done by using FLC and the hysteresis band method. Performance of system under FLC and hysteresis band is assessed in terms of power quality parameters, or total harmonic distortion (THD), and power factor. It is observed that THD has been reduced significantly with FLC in comparison to the hysteresis band. In addition to this, FLC also significantly improves the power factor of the inverter output for the non-linear load in comparison to the hysteresis band. The improved power factor and reduced THD show the reliable and efficient nature of the grid-connected system.