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Quantification of Losses Caused by Dynamically Changing Shadows in Multi-MW PV Plants Based on Computations on Top of Monitoring
G. Mütter, B. Eizinger, M. Edelbacher
Defects, Large Grid-Connected PV Systems, Monitoring, Energy Performance, System Performance
Operation, Performance, Reliability and Sustainability of Photovoltaics
Subtopic: Operation of PV Systems
Event: 32nd European Photovoltaic Solar Energy Conference and Exhibition
Session: 5CO.16.3
1669 - 1672
ISBN: 3-936338-41-8
Paper DOI: 10.4229/EUPVSEC20162016-5CO.16.3
0,00 EUR
Document(s): paper, presentation


This paper is a report out of practical life with a huge theoretical background and the experience of more than 5 years of operating and monitoring of more than 850 MWp large scale PV plants, located all over Europe, O&M Supervision done by AES, and more than 70 MWp small and medium sized PV plants located in central Europe, O&M coordinated by Greentec Services. All parks have overall performance already beyond the predicted energy yields. The goal was the development of a methodology to quantify the effective losses on dynamically changing shadows like - Growing plants in or near outside the plant - Leaf stripping and leaf growing effects on broad-leafed trees shadowing the modules - Missing grass cutting in large PV-Plants with size of more than 5 MWp. The challenge was to get a tool applicable in all our parks that delivers a precise as possible result to decide based on cost/benefit analysis about corrective activities like cutting vegetation at the economically most feasible time. We will present results and impressive special effects of large PV plants verified in all our parks including: - Reasons why simulation is not economical, especially in large plants -Reasons for underestimation of the real amount of the losses in usual situations - Basics of the methodology, including gimmicks to avoid side effects - Impressive details of some local effects - Details of sample parks including pictures and annual effect distribution - Summary of all our parks