Research Paper. Singla et al., International Journal of Advanced Engineering Technology EISSN


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1 Singla et al., International Journal of Advanced Engineering Technology EISSN Research Paper MODELING OF SOLAR PHOTOVOLTAIC MODULE & EFFECT OF INSOLATION VARIATION USING MATLAB/SIMULINK Vineet Singla 1, Vijay Kumar Garg 2 Address for Correspondence 1 M.Tech Scholar, 2 Asst Prof., EE Department, U.I.E.T, Kurukshetra University, Kurukshetra, Haryana, India ABSTRACT The potential for solar energy as a sustainable source of energy is well understood. With the ever increasing use of solar power the necessity of a model is accentuated. This paper focuses on a MATLAB/Simulink model of a photovoltaic module. It presents the implementation of a generalized photovoltaic model, which can be representative of PV cell, module or array, in order to estimate the electrical behavior of the module with respect to change in environmental parameter i.e. Insolation keeping the cell temperature constant. This model is based on mathematical equations and is described through an equivalent circuit including a photocurrent source, a diode, a series resistor and a shunt resistor. Taking the effect of sunlight irradiance as variable parameter into consideration, the output current and power characteristics of PV model are simulated This enables the dynamics of PV system to be easily simulated, analyzed and optimized. The essential parameters required for modeling the system are taken from datasheets. A particular typical 60W solar panel is used for developed model evaluation and simulation results are compared with points taken directly from the manufacturer s published curves and show excellent correspondence to the model. KEYWORDS Photocurrent, photovoltaic module, MPPT, Insolation, MATLAB/Simulink. I. INTRODUCTION The entire world is facing a challenge to overcome the hurdle of energy crisis. With increasing concerns about fossil fuel deficit, skyrocketing oil prices, global warming and damage to environment & ecosystem, the promising incentives to develop alternative energy resources with high efficiency and low emission are of great importance. Renewable energy resources will be an increasingly important part of power generation in the new millennium. Besides assisting in the reduction of the emission of greenhouse gases, they add the much needed flexibility to the energy resource mix by decreasing the dependence on fossil fuels [1]. Among the renewable energy resources, the energy through the photovoltaic (PV) effect can be considered the most essential and prerequisite sustainable resource because of the ubiquity, abundance and sustainability of solar radiant energy. Regardless of the intermittency of sunlight, solar energy is a renewable, inexhaustible, widely available & completely free of cost and ultimate source of energy. The main direct or indirectly derived advantages of solar energy are the following; No emissions of greenhouse (mainly CO 2, NOx) or toxic gasses (SO 2, particulates), reclamation of degraded land, reduction of transmission lines from electricity grids, increase of regional/national energy independence, diversification and security of energy supply, acceleration of rural electrification in developing countries [2]. If used in a proper way, it has a capacity to fulfill numerous energy needs of the world. The power from the sun intercepted by earth is approximately 1.8 x MW [3]. This figure, being thousands of time larger than the present consumption rate enables more and more research in the field of solar energy so that the present and future energy needs of the world can be met. India is endowed with vast solar energy potential. About 5,000 trillion kwh per year energy is incident over India s land area with most parts receiving 47 kwh per sq. m per day [4]. Photovoltaic (PV) system produces DC electricity when sunlight falls on the PV array, without any emissions. The DC power is converted to AC power with an inverter and can be used to power local loads or fed back to the utility [5]. PV module represents the fundamental power conversion unit of a PV generator system. PV system consists of a PV generator (cell, module or array), energy storage devices (such as batteries), AC and DC consumers and elements for power conditioning. The PV application can be grouped, depending on the scheme of interaction with utility grid as: grid connected, stand alone and hybrid. The output characteristics of PV module depends mainly on the solar insolation, the cell temperature and output voltage of PV module. Since PV module has nonlinear characteristics, it is necessary to model the PV unit for MPPT (maximum power point tracking) in PVbased power systems. It is crucial to maximize the output electrical power available from the PV module. Several MPPT (Maximum Power Point Tracking) techniques have been proposed [68]. It is difficult to simulate and analyze PV in the generic modeling of PV power system. This motivates me to develop a generalized model for PV module using MATLAB/Simulink. This article refers about a model for modeling and simulation of PV module. II. PHOTOVOLTAIC MODELS A. Principle of Operation PV Cells are basically made up of a PN junction fabricated in a thin wafer or layer of semiconductor (usually silicon). Fig. 1 shows the photocurrent generation principle of PV cells. In fact, when sunlight hits the cell, the photons are absorbed by the semiconductor atoms, freeing electrons from the negative layer. These free electrons find its path towards the positive layer through an external circuit, resulting in an electric current from the positive layer to the negative layer. Fig.1 Photocurrent generation principle Typically, a PV cell generates a voltage around 0.5 to 0.8 volts depending on the semiconductor and the builtup technology. This voltage is low enough as it cannot be of use. Therefore, to get benefit from this
2 technology, many of PV cells (involving 36 to 72 cells) are connected in series to form a PV module. These modules can be interconnected in series and/or parallel to form a PV panel. In case these modules are connected in series, their voltages are added with the same current. Nevertheless, when they are connected in parallel, their currents are added while the voltage is the same. Also three major families of PV cells are Monocrystalline technology, Polycrystalline technology and Thin film technologies. The monocrystalline and polycrystalline technologies are based on microelectronic manufacturing technology and their efficiency is in general between 10% and 15% for monocrystalline and between 9% and 12% for polycrystalline. For thin film cells, the efficiency is 10% for asi, 12% for CuInSe2 and 9% for CdTe [9]. Thus, the Monocrystalline cell has the highest efficiency. B. Characteristics of Solar Cell PV system naturally exhibits a nonlinear IV and PV characteristics which vary with the radiant intensity and cell temperature. The typical IV and PV characteristics of solar cell are shown in fig 2. Fig. 2 Typical Characteristics of solar cell The fundamental parameters related to solar cell characteristics are Short circuit current (Isc), Open circuit voltage (Voc), Maximum power point (MPP) and Fill factor. Short Circuit Current is the current that corresponds to the short circuit condition when the impedance is low and it is calculated when the voltage equals to zero. It is the greatest value of the current generated by a cell. I (at V=0) = I SC Open Circuit Voltage is the voltage when the open circuit occurs and there is no current passing through the cell. V (at I=0) = V OC Maximum Power Point is the operating point at which the power is maximum across the load. Pm = Vm.Im where, Vm is the maximum voltage and Im is the maximum current. Fill Factor (FF) is essentially a measure of quality of the solar cell. It is calculated by comparing the maximum power to the theoretical power (Pt) that would be output at both the open circuit voltage and short circuit current together. Fill Factor (FF) = P m / (V OC.I SC ) The fill factor is a measure of the real IV characteristic. Its value is higher than 0.7 for good cells. Typical fill factors range from 0.5 to The fill factor diminishes as the cell temperature is increased. Also the open circuit voltage (Voc) increases logarithmically with the ambient irradiation, while the short circuit current (Isc) is a linear function of the ambient irradiation. The dominant effect with increasing cell s temperature is the linear decrease of the open circuit voltage, the cell being thus less efficient. The short circuit current slightly increases with the cell temperature C. Solar Cell Model & Characteristic Equations A general mathematical description of IV output characteristics for a PV cell has been studied for over the past four decades [10][12]. Such an equivalent circuitbased model is mainly used for the MPPT technologies. The simplest equivalent circuit of the general model which consists of a photo current, a diode, a parallel resistor expressing a leakage current, and a series resistor describing an internal resistance to the current flow, is shown in Fig.3 Fig. 3 PV Cell Equivalent Circuit Model. The output of the current source is directly proportional to the light falling on the cell (photocurrent Iph). During darkness, the solar cell is not an active device; it works as a diode, i.e. a pn junction. It produces neither a current nor a voltage. However, if it is connected to an external supply (large voltage) it generates a current I D, called diode (D) current or dark current. The diode determines the IV characteristics of the cell. The voltagecurrent characteristic equation of a solar cell is given as I = I PH I S [exp ( q(v + IR S ) / kt C A) 1] (V + IR S ) / R SH Where I PH is a lightgenerated current or photocurrent, I S is the cell saturation of dark current, q (= C) is an electron charge, k (= J/K) is a Boltzmann s constant, T C is the cell s working temperature, A is an ideal factor, R SH is a shunt resistance, and R S is a series resistance. The photocurrent mainly depends on the solar insolation and cell s working temperature, which is described as I PH = [I SC + K I (T C T Ref )]λ Where I SC is the cell s shortcircuit current at a 25 C and 1kW/m 2, K I is the cell s shortcircuit current temperature coefficient, T Ref is the cell s reference temperature, and λ is the solar insolation in kw/m 2. On the other hand, the cell s saturation current varies with the cell temperature, which is described as Is= I RS (Tc /T Ref ) 3 exp[qe G (1/T Ref  1/T C )/ ka] Where I RS is the cell s reverse saturation current at a reference temperature and a solar radiation, E G is the banggap energy of the semiconductor used in the cell. The ideal factor A is dependent on PV technology and is listed in Table I. Table I Ideality Factor A dependence on PV technology D. Solar Module and Array Model Since a typical PV cell produces less than 2W at 0.5V approximately, the cells must be connected in seriesparallel configuration on a module to produce enough high power. A PV array is a group of several PV
3 modules which are electrically connected in series and parallel circuits to generate the required current and voltage. The equivalent circuit for the solar module arranged in N P parallel and N S series is shown in Fig.4. The terminal equation for the current and voltage of the array becomes as follows [13] [16]. I = N P I PH N P I S [exp (q(v / N S + IR S / N P ) / kt C A) 1] (N P V / N S + IR S )/R SH Fig. 4 General PV Module Equivalent Circuit Model. III. SIMULATION OF SOLAR PV MODULE IN MATLAB A. Building of PV Module Model The use of equivalent electrical circuit makes it possible to model characteristics of a photovoltaic cell. The method used here is implemented in MATLAB / Simulink software for simulations. The same modeling technique is also applicable for modeling a PV module. A general PV model is built using MATLAB/Simulink [17] to illustrate and verify the nonlinear IV and PV output characteristics of PV module. The proposed model is implemented and is shown in Fig. 5. Fig. 5 Simulink Model Implementation for PV Module (Modeling stage) Fig. 5 shows the contents of functional block used in modeling of PV Module. It is important to build a general model suitable for all of the PV cell, module and array. Being illuminated with radiation of sunlight, PV module converts part of the photovoltaic potential directly into electricity with both IV and P V output characteristics. Fig. 6 shows the Masked implementation of PV Module model used in simulation. The input variable i.e Insolation value can be varied & the variation effect on IV & PV output characteristics of PV module can be seen by change in its output value in the curve accordingly. Also, In order to get benefit from the developed model of module, an array of 6 PV modules has been constructed. In fact, these PV modules are Fig. 6 Masked Implementation for PV Module Model interconnected in series and all of them are connected to the external control block as shown in Fig. 7.
4 The PV array model is simulated similarly to the model of the PV module and the obtained results are shown well in next section. The Solarex MSX60 PV module is chosen as reference example for modeling, due is wellsuited to traditional applications of photovoltaics. The MSX 60 module provides 60 watt of nominal maximum power and has 36 series connected polycrystalline silicon cells. The used Solarex MSX60 PV module key specifications are shown in Table II. Table II Solarex MSX 60 PV Module Specifications (1kW/m 2, 25 C) Fig. 7 Masked Implementation for PV Array model. B. Simulation Results of PV Module & Array Model For a PV cell with an ideal IV characteristic, its open circuit voltage and shortcircuit current are given as V OC = V and I SC = 2.0 A, respectively. In addition, N S = N P = 1 for a PV cell. The electrical characteristics of PV module are generally represented by the current versus voltage and power versus voltage curves. Both IV and PV output characteristics of general PV model for a module at various insolation are shown in Figs.89. The nonlinear nature of PV module is apparent as shown in the figs. i.e., the output current and power of PV module depend on solar insolation. Also, we observe that with increase of solar insolation, the shortcircuit current of the PV module increases, and the maximum power output increases as well. The reason is the opencircuit voltage is logarithmically dependent on the solar irradiance, yet the shortcircuit current is directly proportional to the radiant intensity. Fig. 8 IV Output Characteristics of PV Module for different insolation (λ) Fig. 9 PV Output Characteristics of PV Module for different insolation (λ) The peak value of the product of V and I represent the maximum power point (MPP) Pmax of the solar module. The current and voltage of PV module at the MPP are denoted by Imp and Vmp, respectively. The solar module should always be operated in this region so as to extract the maximum power for given input conditions. For this purpose various maximum power point algorithms can be used. The PV Array typical I V & PV Curves are shown in figs. 10 and 11.
5 Fig. 10 PV Output Characteristics of PV Array for insolation (λ =1 kw/m 2 ) It is clear that as the modules are connected in series in an array, the current remains the same whereas the voltage adds up (IV Curve). Similarly the output power of an array is equal to sum of individual PV module power (PV Curve). Both the above curves are drawn for typical value of Insolation, λ=1 kw/m 2. The effect of insolation variation is same as in the case of PV Module. Fig. 11 IV Output Characteristics of PV Array for insolation (λ =1 kw/m 2 ) IV. CONCLUSION The paper presents an improved Matlab /Simulink simulation model. An accurate PV module electrical model is presented for a typical 60W solar panel. The proposed model takes sunlight irradiance & current as input parameters and outputs the IV and PV characteristics under various conditions. The results from the model show excellent correspondence to manufacturer s published curves. A number of discrete data points can be shown on the curves. These are points taken directly from the manufacturer s published curves, and show excellent correspondence to the model. Finally the developed model is used to show the effect of insolation on output characteristics. This paper is the first step to develop a solar photovoltaic power system in simulation. The final objective develops a general model to simulate the electrical behavior of the PV system. Future work will present results for using the presented model in the simulation and design of a complete solar PV renewable energy system. V. ACKNOWLEDGEMENT This work is a part of the M.Tech thesis work of Mr. Vineet Singla conducted during the time period July 2012May 2013 under the able guidance of Mr. Vijay Kumar Garg, Asst Prof., University Institute of Engineering & Technology (U.I.E.T), Kurukshetra University, Kurukshetra. REFERENCES 1. L.A.C Lopes and Lienhardt, A.M. A simplified nonlinear power source for simulating PV panels. Power Electronics Specialist,2003. PESC 03. IEEE 34th Annual Conference on, Volume 4, pp June Wang Q., Qiu H. N. Situation and outlook of solar energy utilization in Tibet, China // Renewable and Sustainable Energy Reviews. Elsevier, No. 13(8). P R. Messenger and J. Ventre, Photovoltaic Systems Engineering, CRC Press, 2000, pp Jawaharlal Nehru National Solar Mission Document 5. B. Kroposki, R. DeBlasio, Technologies for the New Millennium: Photovoltaics as a Distributed Resource. Power Engineering Society Summer Meeting, IEEE, Vol. 3, p.p ,1620 July YC. Kuo, TJ. Liang, and JF. Chen. Novel MaximumPowerPoint Tracking Controller for Photovoltaic Energy Conversion System, IEEE Transactions On Industrial Electronics, Vol. 48, No. 3, June 2001,pp M. A. S. Masoum, H. Dehbonei, and E. F. Fuchs. Theoretical and Experimental Analyses of Photovoltaic Systems with Voltage and CurrentBased Maximum PowerPoint Tracking, IEEE Transactions On Energy Conversion, Vol. 17, No. 4, December 2002, pp L. Fangrui, Y. Kang, Y. Zhang, and S. Duan. "Comparison of P&O and Hill Climbing MPPT Methods for GridConnected PV Converter," Industrial Electronics and Applications, 2008,ICIEA rd IEEE Conference on. pp Savita Nema, R.K. Nema, Gayatri Agnihotri, MATLAB/Simulink based study of photovoltaic cells / modules / array and their experimental verification, International journal of Energy and Environment, vol.1, No.3, pp , S. W. Angrist,, Direct Energy Conversion, Allyn and Bacon, Inc., 4 th edition, 1982, pp O. Wasynczuk, Dynamic behavior of a class of photovoltaic power systems, IEEE Transactions on Power Apparatus and Systems, vol. PAS102, no. 9, 1983, pp J. C. H. Phang, D. S. H. Chan, and J. R. Philips, Accurate analytical method for the extraction of solar cell model parameters, Electronics Letters, vol. 20, no. 10, 1984, pp M. Veerachary, T. Senjyu, and K. Uezato, Voltagebased maximum power point tracking control of PV system, IEEE Transactions on Aerospace and Electronic Systems, vol. 38, no. 1, 2002, pp M. Veerachary and K.S. Shinoy, V2based power tracking for nonlinear PV sources, IEE Proceedings Electric Power Applications, vol. 152, no. 5, 2005, pp I. S. Kim and M. J. Youn, Variablestructure observer for solar array current estimation in a photovoltaic powergeneration system, IEE ProceedingsElectric Power Applications, vol. 152, no. 4, 2005, pp I. S. Kim, M. B. Kim, and M. J. Youn, New maximum power point tracker using slidingmode observer for estimation of solar array in the gridconnected photovoltaic system, IEEE Transaction on Industrial Electronics, vol. 53, no. 4, 2006, pp J. B. Dabney and T. L. Harman, Mastering Simulink, Pearson Education,Inc., 2004.
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