BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Memento EPFL// BEGIN:VEVENT SUMMARY:European PV Solar Energy Conference and Exhibition DTSTART;VALUE=DATE:20190909 DTSTAMP:20260916T220425Z UID:c520519a13fb080e803f71667183a59a1b0213ba01d33e24cb345d10 CATEGORIES:Conferences - Seminars DESCRIPTION:Peter Fiala\nThe European PV Solar Energy Conference and Exhib ition (EU PVSEC) is one of the major events of the PV research. This year hold in Marseille from September 9 to 13\, several PVLAB members will atte nd. Peter Fiala will present on textured single-junction perovskite solar cell while Lionel Bloch will discuss incentives mechanism to promote high penetration of PV in the distribution network while keeping the network op eration in bounds. Finally\, Alessandro Virtuani will present results of t he temperature behavior of light-weight building integrated PV module and a novel model for predicting potential induced degradation  in crystaline silicon modules.\n\nPeter Fialas's abstract:\nIn the field of perovskite thin-film solar cells (PSC)\, solution-based deposition methods dominate a s the most common means to fabricate the perovskite absorber. Typically th is restricts PSC architectures to thin\, planar layers\, which experience optical losses through reflection and transmission. PSC could in theory em ploy a textured absorber interface for ideal light management in order to eschew the optical losses typical of thin films\, but this would require n ew methods and materials. In this work\, we first perform optical simulati ons to determine the effect of different texture designs\, optimize a cond uctive textured substrate\, and finally fabricate proof-of-concept PSC on these substrates. Optical ray-tracing simulations were done using atomic f orce microscopy scans of various textured surfaces. These textures were fo rmed by KOH-etched silicon wafers and boron-doped zinc oxide (ZnO)\, depos ited by low-pressure chemical vapor deposition. Optically optimal ZnO surf aces were then used to fabricate PSC in the p-i-n architecture on ZnO subs trates via a 2-step evaporation/spin-coating method previously reported [1 ]. Demonstrated PSC verified the trends predicted by simulation\, with inc reased short-circuit current density (JSC) and removed interference fringe s from external quantum efficiency curves. However\, improved optical perf ormance and JSC are not the only factors relevant to the overall performan ce of our PSC. Optimization of the full device and the impact of textured interfaces on other device parameters will be discussed at the conference. \n\nLionel Bloch's abstract:\nIn the path toward a decarbonized society\, the integration of a large share of renewable energy source is a mandatory step. In this context\, the EU commission set the goal of a 32% penetrati on of renewable energy by 2030. To achieve this goal\, distributed PV ener gy has to be widely deployed in the low voltage distribution grids. Howeve r\, the variability and uncertainty inherent to PV generation bring\, in c ase of high penetration\, new challenges for distribution grids. In this c ontext\, this work proposes a novel approach to investigate how regulation and tariff-based incentives allow maximising the PV penetration in any di stribution network without requiring high grid reinforcement cost. The fir st step of this approach uses a developed model that optimally allocates e lectricity demand profiles in the distribution grid based on available GIS data. This allocation presents the benefit of preserving the stochastic n ature of the electricity demand\, essential for any grid scale analysis. T hen to evaluate the impact of a specific incentive on the design and contr ol of building energy systems\, a full year optimisation for each building is performed combined with a power flow simulation to ensure both optimal ity of the solution in terms of profitability as well as feasibility in te rms of network operational constraints. The results show the effectiveness of tariff-based incentives and regulation to increase the potential PV pe netration.\n\nAlessandro Virtuani's abstract on BIPV monitoring:\nIn the c ase of older buildings undergoing renovation\, excessive loads are often n ot well tolerated by roofs or other building structures (e.g. facades) [1] \, [2]\, which limits the adoption of PV in these contexts. The idea of li ghtweight modules is very attractive especially for the building‑integra tion of photovoltaics (BIPV) thanks to their reduced weight and strong imp rovements in durability [3]–[5]. On the other hand\, the thick backsheet structure of lightweight modules may be seen as a disadvantage\, because it may induce higher module operating temperatures (OT). In a fully-integr ated BIPV installation\, module operating temperature can be even higher d ue to the limited rear ventilation. Consequently\, the high temperature ma y contribute to a faster module degradation and reduced energy-yield. This work demonstrates that lightweight (~6 kg/m2) photovoltaic module based o n a composite sandwich backsheet and a polymeric frontsheet can reach equi valent (or lower) operating temperatures of standard glass‑glass modules thanks to a careful material selection. Additionally\, we propose an inno vative installation based on Velcro that allows a fast and easier mounting that comply with the static mechanical load test present in the IEC 6121 5.\n\nAlessandro Virtuani's abstract on PID:\n\nWe propose a mathematical model to predict PID in photovoltaic (PV) crystalline silicon modules in t he field. This model is based on empirical equations that relate the time- evolution of the module’s power with the stress factors for PID (e.g. te mperature or humidity)\, obtained from a matrix of accelerated tests in th e laboratory. Then we apply the set of equations with weather data as inpu ts to predict what the power evolution of our mini-modules would be if the y were operating in different climates.\nThis paper is a continuation of a work that we presented in a previous contribution\, where only the phase of power degradation was taken into account. Here\, we improve this model by including the mechanism of regeneration. Moreover\, we improve the simu lations of the different phases of the PID mechanism providing some elemen ts of novelty with respect to previous works.\nOne contribution of our wor k is to analyze the regeneration process that occurs during lightexposure\ , when samples are exposed to negative voltages towards ground resulting i n an interaction between the degradation and the regeneration mechanisms. We observe that\, in conditions of low humidity and high temperature\, reg eneration takes place as well for samples exposed to a high negative bias voltage (−1000 V). This effect\, for which little evidence existed from field monitoring\, is clearly proven by our experimental tests. Moreover\, suitable thresholds on the weather conditions are set to properly simulat e different phases of PID. For instance\, we integrate in the predictive m odel a condition that allows to treat the particular case where the module surface is wet (rain or condensation).\nThe results show that our simulat ions are able to reproduce the seasonal trend of power degradation and reg eneration as it was observed in the field in the same climate. Moreover\, by employing the dependence of power degradation on the voltage level\, we are able to simulate the effect of PID on an entire string of modules. St arting from our experimental work\, we also propose a sequence of accelera ted PID tests beyond the current IEC Technical Specification 62804-1:2015 that allows for better prediction of PID in real field conditions. Finally \, we are confident that the mathematical adaptation we developed for our simulations can be applied to simulate other degradation mechanisms that i nduce a non-monotonous behavior on the power evolution of the module\, the refore leading to an improved prediction ofreliability of photovoltaic mod ules in different climates.\n  LOCATION: STATUS:CONFIRMED END:VEVENT END:VCALENDAR