Presentation Details
| Improved spectral correction for a PV system with CdTe modules Keith McIntosh1, Solomon Freer1, Malcolm Abbott1, Chris Stelzer2, Andrew Loveall2, Samuel Vielman2. 1PV Lighthouse, Coledale, Australia.2Kiewit, Lenexa, KS, USA |
Abstract
We measure and analyze the spectral correction fλ associated with CdTe modules on a tracking utility-scale system located in Ohio, USA. Measurements were taken from 47 days over the summer, spanning a wide range of atmospheric conditions. We observe the expected trends, whereby fλ increases with increasing humidity, decreasing aerosols and increasing cloud cover. We then find that the clear-sky fλ can be predicted more accurately by ray tracing the direct and diffuse solar spectra than by the conventional First Solar model, especially on days with moderate aerosols. We also evaluate approaches to predicting cloudy-sky fλ and quantify how improvements to the spectral model influence yield forecasting.
No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.