Investigation of High gain MIC power converter for multicrystal PV module employing fuzzy logic technique

Abstract

Original scientific paperA Mutual Inductive Coupled (MIC) DC-DC power converter circuit for Photo-Voltaic (PV) system employing fuzzy logic based maximum power point tracking is presented in this research paper. The proposed DC-DC converter has been modelled and simulated using Matlab-simulink environment for obtaining high gain. The mutually coupled inductor uses one core instead of two or more, which reduces size of the converter. A passive regenerative snubber is exploited for absorbing the energy of stray inductance and also the capacitors are charged in parallel and discharged in series through the mutual coupled inductor for achieving high voltage gain of this converter. The voltage gain characteristics of the MIC converter have been studied for various coupling coefficient, turns ratio of two-winding mutual inductor and duty cycle. Moreover, PV system is conveniently interfaced with proposed power converter for maximizing the solar energy yield and analysed by employing Perturb & Observe (P&O) and fuzzy logic based MPPT algorithms under various operating conditions. The obtained results reveal that, the fuzzy controller provides good improvement in tracking of maximum power and helps to extract considerable amount of additional solar energy from a PV module as compared with P&O algorithm.Key words: Photo-Voltaic system, Perturb & Observe algorithm, Mutual -Inductive Core, Fuzzy Logic Control.Istraživanje pretvarača sa spregnutim me uinduktivitetom za više-kristalne fotonaponske sustave s velikim pojačanjem korištenjem neizrazite logike. U ovome radu prikazan je DC-DC pretvarač sa spregnutim me uinduktivitetom (MIC) za fotonaponske (PV) sustave izveden uz praćenje optimalne radne točke korištenjem neizrazite logike. Predloženi DC-DC pretvarač modeliran je i simuliran korištenjem Matlab-simulink okruženja za velika pojačanja. Spregnuti me uinduktivitet koristi jednu jezgru umjesto dvije ili više njih, što umanjuje veličinu pretvarača. Pasivna regenerativna prigušnica je korištena za apsorpciju energije lutajućih struja te su kondenzatori punjeni u paraleli i pražnjeni u seriji kroz spregnuti me uinduktivitet u svrhu ostvarivanja velikog naponskog pojačanja pretvarača. Karakteritike naponskog pojačanja MIC pretvarača su proučavane za različite koeficijente spregnutosti, omjer zakretaja dvostruko namatanih me uinduktiviteta i trajanje ciklusa. Nadalje, PV sustav je prigodno povezan s predloženim pretvaračem za optimiranje doprinosa solarne energije i analiziran korištenjem algoritma perturbiranja & razmatranja (P&O) te MPPT algoritma zasnovanog na neizrazitoj logici za različite uvjete rada. Rezultati prikazuju da neizraziti regulator pruža napredak u praćenju optimalne radne točke i pomaže pri izlučivanju zamjetne količine dodatne solarne energije iz PV modula u usporedbi s P&O algoritmom.