NDLI: Site-dependent system performance and optimal inverter sizing of grid-connected PV systems

Content Provider	IEEE Xplore Digital Library
Author	Burger, B. Ruther, R.
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. Energy Syst., Fraunhofer Inst. for Solar Energy Syst., Freiberg, Germany (Burger, B.)
Abstract	The sizing of grid-connected PV systems does not usually take into account the site-dependent peculiarities of the solar irradiation distribution characteristics. Because of the perceived notion that PV systems hardly ever have a DC output equal to or above their STC-rated nominal power, inverters are usually sized with a nominal AC output power some 30% (sometimes even more) below the PV array nominal power. This practice might lead to considerable energy losses, especially in the case of PV technologies with low temperature coefficients of power and at sites with warm climates and an energy distribution of sunlight shifted to higher irradiation levels. We discuss the consequences of the time resolution of the irradiation data set used to determine a particular site irradiation distribution on inverter sizing. Most of the available irradiation data measured at individual sites are hourly averages, which lead to filtering of irradiation peaks, which might result in inaccurate performance estimations. When calculating inverter yearly efficiencies using both hourly averages and one-minute averages of the solar irradiation, we can show that the actual losses due to inverter undersizing increase with increased time resolution, revealing that hourly averages hide important irradiation peaks.
Sponsorship	IEEE Electron Devices Soc. (USA)
Starting Page	1675
Ending Page	1678
File Size	840217
Page Count	4
File Format	PDF
ISBN	0780387074
ISSN	01608371
DOI	10.1109/PVSC.2005.1488469
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-01-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	System performance Inverters Energy loss Temperature distribution Energy resolution Design optimization Temperature dependence Solar energy Laboratories Power generation
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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