Optimized Structure of A 3-level Photovoltaic Subarray To Prevent Damage Due To Failed Cells

A computer program is used to simulate the behaviour of a photovoltaic field in the presence of shadowed or failed cells. A series-parallel-series structure with shunt diodes, i.e. a module of a field, has been simulated for a wide range of parameter values. A plot of the field power loss against the parameter values allows the optimal set of parameter values to be chosen; they define the optimized structure of the field module in the sense that the minimum power loss is obtained for a given percentage of failed cells

The Sapv Simulation Program

The problem of correct dimensioning of a Stand Alone Photo Voltaic (SAPV) plant is not completely solved. An accurate and simple tool for the performance prediction of the system and its components is needed. In this paper we describe a simple but accurate simulation program. It uses easily available climatic data (daily mean values). The measurements needed to characterize the SAPV components are discussed with some detail. The results of several runs using the solar radiation generated with a stochastic technique are shown; from them we have drawn some criteria for correct dimensioning. The daily radiation sequences, used in our program, reproduces the autocorrelated nature of the solar flux, then assure that the effect of the climat variability on the storage dimensioning is well considered

Validation of A Simulation Program For Photovoltaic Systems

A program simulating the long term behaviour of PV system is validated by means measurements done for about two years on a stand alone system of 760 W(p) with a storage battery of 280 Ah. The simulation is carried on with measured solar radiation as well as with data generated by stochastic technique. The simulated and measured solar total covered load are compared. For both radiation kinds the simulation fits the experimental data in a satisfying way. The effect on the storage of the autocorrelated nature of daily radiation sequences is accounted for using a generation technique which reproduces well the short term fluctuations