Design of Buck Converter Controller in a Photovoltaic Power Conditioning System

Abstract

td a t e:2 0 1 3 .1 1 .3 0 . , J u d g me n td a t e:2 0 1 3 .1 2 .1 0 . , P u b l i c a t i o nd e c i d ed a t e:2 0 1 4 .4 .7 . ) Abstract :Ge n e r a l l y , b u c kc o n v e r t e rc o n t r o l l e ri sd e s i g n e dt oc o n t r o lt h eo u t p u tv o l t a g eo ft h ec o n v e r t e r . Ho we v e r , d e s i g no ft h ec o n t r o l l e ri nap h o t o v o l t a i cp o we rc o n d i t i o n i n gs y s t e m i sd i f f e r e n tf r o m t h e o r e t i c a l d e s i g ng u i d e l i n e . Th e c o n t r o l l e ri nap h o t o v o l t a i cp o we rc o n d i t i o n i n gs y s t e m c o n t r o l st h ei n p u tv o l t a g eo ft h ec o n v e r t e r( t h eo u t p u tv o l t a g e o ft h es o l a rc e l l )t ome e tama x i mu m p o we rp o i n tt r a c k i n g( MP P T)p e r f o r ma n c e . I nt h i ss t u d y , an e w mo d e l f o rb u c k c o n v e r t e ru s e d i n a p h o t o v o l t a i c p o we rc o n d i t i o n i n g s y s t e m i s p r o p o s e d ,wh i c h i s l i n e a r i z e d a f t e rs t a t e -s p a c ea v e r a g i n gi ne a c hp e r i o d . Al s o , ma t h e ma t i c a le x p r e s s i o no ft h emo d e l e db u c kc o n v e r t e ri si n t e r p r e t e ds e p a r a t e l ya s s ma l la n dl a r g es i g n a l s ;t h e r e f o r ei t sa p p r o p r i a t e n e s si sme a s u r e dt od e s i g nl i n e a rv o l t a g ea n dc u r r e n tc o n t r o l l e r s .