Modeling of Photovoltaic System in the Large Ocean-going Ship Based on Simulink

Transcription

1 2016 International Conference on Materials, Inforation, Mechanical, Electronic and Coputer Engineering (MIMECE 2016) IBN: Modeling of Photovoltaic yste in the Large Ocean-going hip Based on iulink Jun Fu and Xiao-ping Jia ABTRACT Main purpose of this paper is to establish a precise atheatical odel of solar photovoltaic array in the ship. Firstly analyzed perforance paraeters of solar PV power generation syste in the COCO TengFei ship and gave principle odel of PV cell onoer. Then, the practical engineering atheatics odel was proposed for PV cell odule. The atheatical odel of the PV cell array was established. Finally, this paper copared and analyzed the siulation results and the data fro ship, drew the conclusion that the accuracy of the siulation odel was verified. o this atheatical odel can be used to characteristic research that PV power generation syste parallel with power station syste in the ship, for exaple axiu power point tracking, active filter, reactive power copensation, etc. Key words: ship; photovoltaic (PV) cell array; engineering atheatical odel; INTRODUCTION In Noveber 2012, the project Application technology research of solar energy on the larger-going ship is established by National inistry of industry and inforation technology. The total capacity is kw in the COCO TengFei hip. This syste have two operation ode, PV syste off-grid ode, gridconnected ode [1]. THEORETICAL MODEL OF PV CELL When the seiconductor is in the light, tate of charge distribution in a seiconductor is changed. This change produces electrootive force and current, it is called a kind of energy conversion effect [2]. Circuit diagra is shown in Figure 1: Jun Fu, QingDao Ocean hipping Mariners College, QingDao , China Xiao-ping Jia, QingDao, Ocean hipping Mariners College, QingDao , China 155

2 I Rs I sh I ph I d Rsh V Figure 1. PV cell circuit principle diagra. The current forula of PV cell is written fro Figure 1: I I I I ph d sh Thereinto: Light intensity, W/ 2 ; T urface teperature of PV, ; T Reference teperature, 25 ; Ct teperature coefficient, ; Isc hort circuit current;i0 Reverse saturation current; q Quantity of charge, C; n Diode eission coefficient; K Boltzann constant, J/K; The forula (2), (3), (4) into (1), it is the expression of output current of PV: qv ( IRs ) I Isc /1000 Ct ( T T ) I exp[ ] 1 ( V IRs ) / Rsh (5) nkt Theoretical odel of PV cell is very accurate, but forula(5) is a transcendental equation. It is difficult to deduce the analytic solution of I. The practical value is not very big in the PV cells onoer odeling application [3]. (1) Isc I ph Ct ( T T ) (2) 1000 qv ( IRs ) Id I0 exp 1 (3) nkt I ( V IR )/ R (4) sh s sh ENGINEERING MATHEMATICAL MODEL OF PV MODULE PV array is series and parallel connections of PV odules. According to the standard conditions of the anufacturer( =1000W/ 2, T=25 ) the test paraeters of solar panel, Isc, Voc, I, V, In order to establish atheatical odel of engineering, on the basis of the forula (1) two approxiation are done [4] : (1) Due to the Rsh is very big, o ignore the ite (V + Rs I) /Rsh. (2) The Rs is far less than the positive resistance of the diode, o Isc=Iph. Based on the above assuptions, the engineering atheatics odel of PV odule is put forward, forula(6), (7), (8). I Isc C1Isc[exp( V / CV 2 oc ) 1] (6) C1 (1 I / Isc )exp( V / CV 2 oc ) (7) 1 C ( V / V 1)[ln(1 I / I )] (8) 2 oc sc 156

3 MATHEMATICAL MODEL OF OLAR PV ARRAY IN THE HIP PV odules which are installed in the COCO TengFei hip are produced by YingLi green energy copany. Rated voltage is 31.0V, Rated current is 8.55A, Open circuit voltage is 39.0V, hort circuit current is 8.93A. There are 540 solar panels in the ship. It is divided into three arrays. The arrangeent of PV array is shown in Figure blocks 18 groups Figure 2. Layout drawing of PV. According to forula(6) and Figure 2. engineering atheatics odel equation (9) can be established [5] : Figure 3. iulation odel of solar PV cells array. I I C I [exp( V / ncv ) 1] (9) sc 1 sc 2 oc T T K ' oc ' air T T T (10) (11) 1 (12) ' Isc Isc (1 a T ) (13) V V (1 c T )(1 b ) (14) oc ' I I (1 a T ) (15) V V (1 c T )(1 b ) (16) 157

4 Figure 4. I-U characteristic curve of PV cells array under different light intensity. Thereinto: =18, n=10; Under standard conditions, =1000W/ 2, T=25. forula (9) is established. When the light intensity (W/ 2 )and battery teperature T( ) are not erence value, it ust be consider that the environent condition influence on the PV cell characteristics [7]. I ' sc Voc ' I ' V ' are calculated according to Isc Voc I V. In the forula: K is teperature coefficient of PV cell when the solar radiation intensity changes, Using the typical values /W; ΔT is difference between the actual battery teperature and erence battery teperature, ; a, b, c are constant, recoended value: a =0.0025/, b=0.5/, c= / [6]. As we know that influence of light intensity and battery teperature is nonlinear to electrical characteristics of PV array. o we ake the linear approxiation to Forula (9) - (16). IMULATION MODEL AND OUTPUT CHARACTERITIC Based on the equivalent circuit diagra 1 of PV cells and forula (9) - (16), the siulation odule is set up in siulink [7], As shown in Figure3. when the environent teperature is 25, then saples of the siulation odel through changing the load resistance, so get the output characteristics I - U curve and P-U curve of PV cells under different light intensity, As shown in Figure 4 and Figure 5. Maintain a constant light intensity =1000W/ 2, then saples of the siulation odel through changing the load resistance, so get the output characteristics I - U curve of PV cells under different teperature, As shown in Figure 6. Figure 5. P-U characteristic curve of PV cells array under different light intensity. Figure 6. I-U characteristic curve of PV cells array under different teperature. 158

5 CONCLUION By analyzing the working principle of solar PV cells, Engineering atheatics odel of PV cells array is put forward, The siulation atheatical odel is set up in iulink, odel is siulated Under the condition of different illuination intensity and different teperature. The siulation data were copared with the easured data, o we can draw a conclusion that Engineering atheatics odel of PV cells array is accurate, it provide theoretical and technical support for design and perforance analysis parallel operation. ACKNOWLEDGMENT This work is supported by the handong Province Higher Educational cience and Technology Progra under Grant J14LN72, Ministry of industry and inforation Technology of China branch project under Grant and H-005. hinan District cience and Technology Developent Funds of Qingdao City under Grant ZH and ZH. REFERENCE 1. Yan Xin-ping. Progress Review of New Energy Application in hip [J]. hip & Ocean Engineering, 2010, (6): un Yu-wei.Design and Perforance Evaluation for Marine Photovolatic Laboratorial syste [D]. Wuhan University of Technology, Wu Zeng-qiang, etc. Research on Photovoltaic Cells Based on Matlab/iulink Modeling [J]. Industrial Control Coputer, 2014, (3): Zhen Yi, etc. Modeling and the Analysis of Output Feature of olar Enery Photovoltic Cell Based on iulation [J]. Journal of Lanzhou JiaoTong University. 2013, (1): Peng Lele, etc. Engineering Model and Paraeters Deterination Method of PV Cell and Array [J]. Actaenergiae olaris inica. 2013, (1): u Jianhui, etc. Investigation On Engineering Analytical odel of ilicon olar Cells [J]. ACTA Energiae olaris inica (4): Fan Fa-jing. Coparison of Modeling Methods for Photovoltaic Cells Based on MATLAB [J]. Machine Building Autoation, 2012(2):