TY - JOUR
T1 - Performance analysis of concentrator photovoltaic dense-arrays under non-uniform irradiance
AU - Ben Or, Assaf
AU - Appelbaum, Joseph
PY - 2013
Y1 - 2013
N2 - The paper deals with concentrator photovoltaic dense-arrays under non-uniform solar irradiance. For given measured I-V characteristic of InGaP/GaAs/Ge multi-junction solar cells, estimated cell parameters connected to bypass diodes were obtained by using the Newton-Raphson method. Based on the cell parameters, the I-V characteristics of arrays were constructed and their performances under non-uniform irradiance were investigated. With the arrays performances analysis, the function of bypass diodes was also analyzed. Under non-uniform irradiance, the photo-generated currents of the cells are different and as a result, the I-V characteristic of the array contains steps. The steps may indicate the mismatched cells in the array operating in the negative voltage range and forcing the bypass diodes to conduct. For low dispersion of the non-uniformity of the solar flux, the inclusion of bypass diodes has no effect on the output power of the array; however for high dispersion, the output power decreases because the mismatched cells become reverse biased and dissipate power.
AB - The paper deals with concentrator photovoltaic dense-arrays under non-uniform solar irradiance. For given measured I-V characteristic of InGaP/GaAs/Ge multi-junction solar cells, estimated cell parameters connected to bypass diodes were obtained by using the Newton-Raphson method. Based on the cell parameters, the I-V characteristics of arrays were constructed and their performances under non-uniform irradiance were investigated. With the arrays performances analysis, the function of bypass diodes was also analyzed. Under non-uniform irradiance, the photo-generated currents of the cells are different and as a result, the I-V characteristic of the array contains steps. The steps may indicate the mismatched cells in the array operating in the negative voltage range and forcing the bypass diodes to conduct. For low dispersion of the non-uniformity of the solar flux, the inclusion of bypass diodes has no effect on the output power of the array; however for high dispersion, the output power decreases because the mismatched cells become reverse biased and dissipate power.
KW - Concentrator photovoltaic dense-arrays
KW - I-V characteristic
KW - Multi-junction solar cell parameters
KW - Parameter estimation
UR - http://www.scopus.com/inward/record.url?scp=84879308442&partnerID=8YFLogxK
U2 - 10.1016/j.solmat.2013.04.029
DO - 10.1016/j.solmat.2013.04.029
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AN - SCOPUS:84879308442
SN - 0927-0248
VL - 117
SP - 110
EP - 119
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
ER -