Unintentional islanding results in safety hazards, power quality degradation, and many other issues. Thus, islanding detection of grid-connected distributed generation system is a key function for standards compliance. Many anti-islanding schemes are currently being studied; however, existing anti-islanding schemes used in inverters have power quality degradation and non-detection zone issues. Therefore, this paper analyzes existing anti-islanding schemes by using frequency drift in accordance with both islanding detection performance and power quality. This paper also proposes a new anti-islanding scheme by using frequency drift. Both simulation and experimental results show that the proposed scheme has negligible power quality degradation and no non-detection zones compared with other existing schemes.
De s i g no fHy b r i dSy s t e m f o rBa t t e r yCh a r g e · Di s c h a r g e u s i n gP h o t o v o l t a i c / Fu e lc e l l 박봉희* ․조영민* ․최주엽* †․조상윤* ․최익* * ․이동하* * * ․ P a r kB o n g -H e e * ,J oY e o n g -mi n * ,Ch o i J u -Y e o p * †, C h oS a n g -Y o o n * ,C h o yI c k * *a n dL e eD o n g -H a * * * ( S u b mi td a t e:2 0 1 4 .5 .2 5 . ,J u d g me n td a t e:2 0 1 4 .6 .1 1 . ,P u b l i c a t i o nd e c i d ed a t e:2 0 1 4 .1 0 .3 1 . )
Abstract : P h o t o v o l t a i ca n df u e lc e l ls y s t e msc a nb eu s e da sp o we rs o u r c ei nmo b i l er o b o t s .Att h i st i met h e p h o t o v o l t a i cs y s t e m g e n e r a l l yg e n e r a t ep o we ri nd a y t i me . Th es t a r t i n gt i meo ff u e l c e l l i ss l o we rt h a nt h el i t h i u m b a t t e r y .To c o mp e n s a t e f o rt h e s e d i s a d v a n t a g e s ,a b a t t e r y c h a r g e -d i s c h a r g e s y s t e m i s u s e d .E s p e c i a l l y t h e b i -d i r e c t i o n a lc o n v e r t e ri s u s e d ma i n l y i n t h ec h a r g e -d i s c h a r g e me t h o d .Th ec o n t r o l l e ri n a b u c k c o n v e r t e rc 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 rt ome e tt h ema 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 . F i r s t o fa l l , t h es i mu l a t i o n so fh y b r i ds y s t e m f o rb a t t e r yc h a r g e -d i s c h a r g es y s t e m i ne a c hs t e ps i mu l a t e du s i n gs o l a r a n df u e lc e l lmo d e l i n ga si n p u ts o u r c ei nP S I M.E x p e r i me n to ft h eb u c ka n db i -d i r e c t i o n a lc o n v e r t e rs y s t e m i s [논문] 한국태양에너지학회 논문집
Islanding protection of a grid-connected photovoltaic (PV) inverter is a key function for standards compliance. Unintentional islanding results in safety hazards, reliability, and many other issues. Therefore, many anti-islanding schemes have been examined. However, existing anti-islanding schemes have poor power quality and non-detection zone issues. Moreover, most schemes have problems that deteriorate the performance of islanding detection under parallel operation. Therefore, this paper proposes a novel anti-islanding scheme that has negligible power quality degradation and has no non-detection zone and islanding detection under a parallel operation. Both simulation and experimental results validate the proposed scheme.
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