Page 157 - Renewable Energy Devices and System with Simulations in MATLAB and ANSYS

144 Renewable Energy Devices and Systems with Simulations in MATLAB and ANSYS ®
®

TABLE 6.6
Datasheet for the Chosen PV Module

Manufacturer Trina Solar Energy Cell Technology Mono cSi
PV Module TSM-270DC05A.08 Certification EU
(02/2014)
Electric properties Temperature coefficients
Nominal power 270.00 Wp MPP voltage — —
Performance 1.11% Open-circuit voltage −0.3200%/°C −123.5 mV/°C
tolerance
MPP voltage 30.80 V Short-circuit current 0.0530%/°C 4.89 mA/°C
MPP current 8.77 A Degradation due to aging
Open-circuit voltage 38.60 V Open-circuit voltage 0.00%
tolerance
Short-circuit current 9.23 A MPP voltage tolerance 0.00%
Permissible system 1000 V MPP current tolerance 0.00%
voltage
PV module 16.50% Short-circuit current 0.00%
efficiency (STC) tolerance
Grounding No grounding Additional information
recommendation
Mechanical properties Current PV module Yes
Number of cells in 60 Own PV module No
the PV module
Width 992 mm Favorite No
Length 1650 mm Comment
Weight 18.60 kg
Source: S. GmbH, Sunny design web, 2015, available: http://www.sunnydesignweb.com/sdweb/#/Home.

After that, the type and numbers of the PV modules are chosen. In this design, there are 10 modules
that give the following main plant specifications:

• 10 × 270 Wp = 2700 Wp
• Maximum open-circuit voltage from the system voltage: V = 35.8 × 10 = 358 V
oc
• Maximum current in one string: I = 7.45 A
sc
When designing PV systems in cold regions, the maximum voltage has to be calculated for −10 °C,
whereas the module data are given for +25 °C for most of the cases. It is important to consider the
temperature coefficient of the module, as it can be read from Table 6.6 to be −0.32%/K. Therefore, the
=
⋅
voltage rise in the system due to the low temperature can be calculated as (25 10+ ) .0321085
. %,
which is automatically given by the software and is an important information based on which the
PV inverter is chosen.
As seen in Table 6.7, the software returns the number of inverters that can be used for the chosen
configuration. For the design presented in this chapter, the Sunny Boy 2.5-1VL-40 has been chosen.
The inverter has a maximum output power of 2.5 kW, while the maximum input voltage is 600 V
DC
with a maximum current of 10 A. As seen in Table 6.7, all the design parameters are within the limits
of the inverter.
After the selection of the inverter, the software returns an overview showing the main technical
data for the designed PV system. The annual yield is calculated to be 2558 kWh with a specific yield
per year at 959 kWh/kWp. The inverter is a single-phase inverter, and therefore, the manufacturer