PVSYST coeficientes

Application Note System Parameter Specifications for PVSYST* Simulations Purpose This document provides users of the PV system simulation software PVSYST with recommended settings and values for parameters used when performing a simulation of a PV system constructed with First Solar FS Series 2 products. The results of the simulation depend upon assumptions and choices made at the time the PV s ystem is described, and on global software preferences specified by the user. This document describes the configuration** of PVSYST used by First Solar. This configuration was developed in order to provide an estimate of actual measured performance of PV systems constructed with First Solar FS Series 2 products. First Solar recommends that this configuration of PVSYST be used when attempting to simulate the operation of PV systems in most locations which utilize First Solar FS Series 2 products and standard design practices. Alternate design design assumptions and site-specific adjustments may be required for specific applications or site conditions.

Scope This configuration is designed to work with the recommended parametric descriptions of First Solar PV modules described in First Solar document PD-5-301-MS, “Recommended Parametric Descriptions of FS series 2 PV Modules f or use with PVSYST Versions 4.35 and Higher.”

Results The various settings and values indicated in this document were used to configure PVSYST in preparation for simulating a variety of actual grid-tied PV systems constructed with First Solar FS Series 2 products and located in various E uropean and North American climates. The simulation results for predicted energy yield and performance ratio (PR) were then compared to the actual measured performance of these systems. In addition, predictions of  operating conditions, such as global irradiance in the plane of array , module temperature, and ambient temperature were compared to measured values f or these quantities. Good agreement was obtained, with errors in energy prediction and PR values l ess than 3.5% with respect to values calculated from measured performance data.

* PVSYST is a commercial software product for the simulation of PV systems. It is available from the Centre Universitaire d’étude des Problèmes de l’énergie (CUEPE) at the University of Geneva. For more information, visit www.pvsyst.com. This

document is intended for use with PVSYST Versions 4.35 and higher. ** Parameter values not described in this document can be assumed to hold the PVSYST default value based on PVSYST Version 4.35 defaults.

www.firstsolar.com PD-5-301-SS Rev 2 Page 1 of 2

Preferences Section

Category

Subcategory

Default Values

Default Units

Parameter

Value or Setting

Irradiance

W/m

Energy

kWh

Irradiation Transposition Model

Hay Model (robust)

Preferences

Physical Models

2

Table 1. Recommended configuration of PVSYST Preferences menu settings for simulation of PV syst ems constructed with First Solar FS Series 2 products.

Project Section

Category

Subcategory

Parameter

Unit

Value or Setting

Thermal Parameters

Constant loss factor KC

W/m -K

Wind loss factor KV

W/m -K/m/s

0.0

Loss fraction at STC

%

1.5

Voltage drop across series diode

V

0.0

Module efficiency loss

%

1.5

Power loss at MPP

%

1.5

Loss when running at fixed voltage

%

3.0

2

29.0

2

Ohmic Losses

Module QualityMismatch

Rainfall Frequency: *Soiling Loss

IAM Losses

Yearly loss factor

%

ASHRAE Model: b0

[unitless]

Rare

Monthly

Weekly

3.0

2.0

1.0

0.03

Table 2. Recommended configuration of PVSYST System Loss settings for simulation of PV systems constructed with First Solar FS Series 2 products.

* The “Soiling loss” parameter is defined here in terms of the frequency of rainfall, which affects cleaning of the modules. For snowy climates, consideration should also be taken for losses occurring during the winter months. Monthly soiling losses may be used within PVSYST if seasonal phenomena are relevant at the project site.

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