Abstracts Book - IMRC 2018

• SC4-P029
ANALYSIS OF TCT PV ARRAYS BY MEANS OF CIRCUITAL
SIMPLIFICATION USING THE SINGLE DIODE MODEL
Luz Adriana Trejos 1 , Bonie Johana Restrepo Cuestas 2
1 Universidad Nacional de Colombia, Facultad de Minas, Colombia. 2 Instituto Tecnológico
Metropolitano, Grupo de Investigación en Materiales Avanzados y Energía, Colombia.
Photovoltaic (PV) systems have become in a growing research area due to the
current tendency of using renewable sources in order to face energy challenges
as environment conservation and the increasing prices of fossil-based fuels. The
analysis of PV systems in terms of the prediction of the generated power is
commonly carried out by means of mathematical models based on the
construction of a system of equations which must be solved to find the voltages
and currents of the PV array. Such models require information relative to the
operating conditions: irradiance, temperature, partial shading and configuration
of the PV array. Concerning the configuration, there are basically four structures
widely reported in literature: the Series-Parallel (SP), the Total Cross Tied (TCT),
the Bridge Linked (BL) and the Honey Comb (HC). In actual PV power plants, SP
configuration is the most common connection but when the PV system operates
under partial shading conditions, TCT configuration exhibits better energetic
performances. For SP configuration, there is a significant number of procedures
reported on literature, while for other configurations there is a lack of detailed
modeling procedures. Taking advantage of some already reported modeling
techniques for SP arrays, this work proposes a methodology for converting TCT
arrays into a SP string performing a circuital simplification by lumping all PV
modules connected in parallel into one single module. The PV modules are
representing by the ideal single diode model including the bypass diode, then
the lumping process basically requires to aggregate the circuit parameters, e.g.
the photovoltaic currents (Iph), the series and parallel resistances (Rs and Rh
respectively). The proposed procedure is evaluated in two modeling techniques
aimed to SP arrays which have been already reported. The validation of the
proposed solution is made through simulations in Matlab and experimental
tests carried out in a 3x3 TCT array using ERDM10 PV panels.
Keywords: photovoltaic, mathematical modeling, partial shading
Presenting authors email: latrejosg@unal.edu.co