Analysis and Design of Lead-Lag Controller and Fuzzy Logic Controller for Boost Converter Applicable to RES

With the increased penetration of renewable energy sources (RES), it is expected that these alternative energy resources will reveal improved dynamic performance when connected with grid/load. Power electronic converters (PEC) act as an interfacing devices between RES and grid/load. Among many PEC, DC-DC boost converter is used to step-up the DC power level based on the load requirement. In boost converter, maintain a stability is one of the major concern when the system is under transient condition. In this paper, frequency response based lag, lead and lead-lag controllers are proposed in order to maintain the system stability with required phase margin (PM), cross-over frequency and bandwidth. A fuzzy based non-linear controller is also proposed and the obtained results are compared with lag, lead and lead-lag controllers. It shows that, fuzzy logic controller exposed good performance with respect to settling time, rise time and peak overshoot than linear controllers.