Category: Utility Scale Generation
Bifacial modules are being deployed at large PV systems, but their performance is still uncertain increasing financial risk for developers, owners, and investors. Bifacial modules have the potential to increase energy output, but there are only a few PV system models available to predict their performance. In order to address the opportunity that bifacial modules present, DNV GL has developed a bifacial performance model for PV systems to predict the increase in energy output. The bifacial model has been integrated into the full PV system model presented at SPI last year ["Accurate Performance Prediction of Large Scale PV Power Plants with Complex Layouts," Mark A. Mikofski, SPI, 2018] to estimate the backside irradiance and combine it with the front side to predict the net power produced including mismatch from shading on the front surface. With the bifacial model, DNV GL is able to estimate the uncertainty in deploying PV systems with bifacial modules, predict PV system designs that maximize the bifacial gain, and demonstrate the increase in energy over an equivalent monofacial PV system. Understanding the uncertainty and more accurately predicting the performance of bifacial modules decreases the risk of deploying these systems. Site design for bifacial modules may differ from monofacial systems, so optimization is also important. In this presentation DNV GL will provide guidance for developers, independent engineers, and operators to design, evaluate, and optimize PV systems with bifacial modules, minimize risk, and maximize profits.
Mark Mikofski– Principal Engineer, DNV GL