-This paper presents an algorithm of a compensation of the grid current distortion caused by the grid voltage unbalance and distortion in 3-phase bi-directional DC to AC inverter. Usually 3-phase grid system has unbalance and distortion because of connecting 1-phase and non-linear load with 3-phase load using same input node. Controlling 3-phase inverter by general method under the unbalanced and distorted grid voltage, the grid current has distortion. This distortion of the grid current cause the grid voltage distortion again. So, it need to control the grid current balanced and non-distorted, even the grid voltage gets unbalanced and distorted. There are some complex method to compensate the gird current distortion. it suggest simple method to solve the problem. Simulation and experiment is used to validate the proposed algorithm.
Fuel cell power system is one of the most promising energy source for the alternative energy because it has unique advantages such as high energy density, no power drop during operation, and feasible to make compact size. However, due to very low response time, fuel cell is difficult to correspond to drastic load changes and start-up operation. For solving these problem, fuel cell power system must include energy storage device such as Li-Poly battery or super capacitor. Therefore, bi-directional DC-DC converter must be required for this storage device and fuel cell-PCS control. This paper presents a design and modeling of the bi-directional DC/DC converter. Firstly, we present modeling the boost and buck mode of the bi-directional converter through both PWM switch model and state space averaging technique. Secondly, in order to minimize output ripple and transient response overshoot, we have two identical DC-DC converters interleaved and adopt two-loop voltage-current controller. The proposed bi-directional DC-DC converter's modeling method and control design have been verified with computer simulation and experimentation.
td a t e:2 0 1 3 .1 1 .4 . ,J u d g me n td a t e:2 0 1 3 .1 1 .4 . ,P u b l i c a t i o nd e c i d ed a t e:2 0 1 3 .1 2 .2 2 . ) Abstract:Th i sp a p e rp r o p o s e sDCo f f s e tc u r r e n tc o mp e n s a t i o nme t h o do ft r a n s f o r me r l e s sf u e l c e l l /P V P C S . DCo f f s e t c u r r e n ti sg e n e r a t e db yt h eu n b a l a n c e di n t e r n a lr e s i s t a n c eo ft h es wi t c h i n gd e v i c e si nf u l lb r i d g et o p o l o g y . Th eo t h e r c a u s ei st h es e n s i t i v i t yo ft h ec u r r e n ts e n s o r , wh i c hi sl o we rt h a nDS Pi nr e s o l u t i o n .I fp o we rc o n v e r t e rs y s t e m h a s t h e s ec a u s e s , t h eACo u t p u tc u r r e n ti nt h ei n v e r t e rwi l l g e n e r a t et h eDCo f f s e t . I nc a s eo ft r a n s f o r me r l e s sg r i d -c o n n e c t e d i n v e r t e rs y s t e m,DC o f f s e tc u r r e n ti sf a t a lt og r i d -s i d e , wh i c hr e s u l t si ns a t u r a t i n gg r i ds i d et r a n s f o r me r . S e v e r a ls i mu l a t i o n r e s u l t ss h o w t h ed i f f i c u l t i e so fd e t e c t i n g DC o f f s e tc u r r e n t .De t e c t i n g DC o f f s e tc u r r e n t me t h o dc o n s i s t so ft h ed i f f e r e n t i a l a mp l i f i e r sa n dP WM i sc o mp e n s a t e db yt h eo u t p u to ft h eOpa mpc i r c u i twi t h i n t e g r a t o rc o n t r o l l e r . P S I M s i mu l a t i o nv e r i f i e st h a tt h ep r o p o s e dme t h o di ss i mp l e ra n dmo r ee f f e c t i v et h a nu s i n g l o w r e s o l u t i o nc u r r e n ts e n s o ra l o n e .Key Words:직류분( DC o f f s e t ) , 인버터( I n v e r t e r ) , 무변압기형( Tr a n s f o r me r l e s s ) , 태양광( P h o t oVo l t a i c ) , 연료전지( F u e lC e l l )
배터리 내장형 초소형 태양광 장치용 P V MP P T 및 충방전 제어 알고리즘Th eP V MP P T & Ch a r g ea n dDi s c h a r g eAl g o r i t h m f o rt h eBa t t e r yI n c l u d e dSo l a rCe l lAp p l i c a t i o n s 김승민* ․박봉희* * ․최주엽* * †․최익* * *․이상철* * * *․이동하* * * * K i m S e u n g -Mi n * ,C h i oJ u -Y e o p * * †,C h o yI c k * * * , L e eS a n g -C h u l * * * * , L a eD o n g -H a * * * *a n dP a r kB o n g -H e e * * ( S u b mi td a t e:2 0 1 3 .8 .1 3 . ,J u d g me n td a t e:2 0 1 3 .8 .2 0 . ,P u b l i c a t i o nd e c i d ed a t e:2 0 1 3 .1 0 .1 0 . ) Abstract:To i n c r e a s e t h e e f f i c i e n c y o ft h e p h o t o v o l t a i c ,a l mo s tp h o t o v o l t a i c a p p l i a n c e s a r e c o n t r o l l e d b yMa x i mu m P o we rP o i n tTr a c k i n g ( MP P T) .E x i s t i n g mo s to ft h eP V MP P T t e c h n i q u e sh a v eu s e dp o we rwh i c h mu l t i p l i e s s e n s e d o u t p u tc u r r e n ta n d v o l t a g e o ft h e s o l a rc e l l .Ho we v e r ,t h e s e a l g o r i t h ms a r e u n n e c e s s a r i l y c o mp l i c a t e da n dt o oe x p e n s i v ef o rs ma l la n dc o mp a c ts y s t e m.Th eo t h e rh a n d , t h ep r o p o s e dMP P T t e c h n i q u ei so n l yo n es e n s i n go ft h eMP P T c o n v e r t e r ' so u t p u tc u r r e n t , s o t h e r ei sn on e e dt oi n s e r ta n o t h e rs e n s o r so fb a t t e r ys i d e .Th e r e f o r e ,t h i sa l g o r i t h m i ss i mp l e rc o mp a r e dt ot h e t r a d i t i o n a la p p r o a c ha n di ss u i t a b l ef o rl o w p o we rs o l a rs y s t e m. F u r t h e r ,t h e n o v e lp r o p e rc h a r g e / d i s c h a r g e a l g o r i t h m f o rt h e b a t t e r y wi t h P V MP P T i s d e v e l o p e d .I n t h i s a l g o r i t h m, t h e r ei sCCb a t t e r yc h a r g emo d ea n dl o a dd i s c h a r g emo d eo ft h eP V c e l l & b a t t e r yd u a l . Al s owed e s i g n c u r r e n tc o n t r o lt o r e g u l a t e a l l o wa b l e c u r r e n td u r i n g t h e b a t t e r y c h a r g i n g .Th e p r o p o s e d a l g o r i t h m wi l lb e a p p l i c a b l et ob a t t e r yi n c l u d e ds o l a rc e l la p p l i c a t i o n sl i k es o l a rl a n t e r na n ds o l a rr e mo t ec o n t r o lc a r .F i n a l l y ,t h e p r o p o s e dme t h o dh a sb e e nv e r i f i e dwi t hc o mp u t e rs i mu l a t i o n .Key Words:태양광 최대전력 추종제어( P V MP P T) , 배터리 충방전 제어( C h a r g ea n dd i s c h a r g ec o n t r o lf o rt h eb a t t e r y ) , 컨버터 모델링( C o n v e r t e rMo d e l i n g ) , 배터리 내장형 태양광 장치( B a t t e r yi n c l u d e ds o l a rc e l la p p l i c a t i o n )[논문] 한국태양에너지학회 논문집
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