Selection of best methods to calculate degradation rates of PV modules

Estimation of PV module degradation through extraction of I – V curve at inverter pre‐startup condition

“…To study the effect of temperature on estimation of R voc during the inverter pre-startup, a 100 kVA solar PV plant pre-startup data is observed for the last four years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. During this period, the inverter is getting started between the extreme temperature conditions, i.e 21°C (during winter) and 33°C (during summer) and these conditions are simulated in MATLAB/Simulink at an irradiance of 50 W/m 2 .…”

“…Another study [11] discussed the assessment of series resistance by computing the time constant from the steady-state oscillations that occurred in the PV output voltage (due to the operation of perturb and observe-based maximum power point tracking (MPPT)) while in [12], module performance is analysed with an external device known as Jubomer fitted in the junction box. Shrestha and TamizhMani [13] explicated four methods (metered raw kWh, I-V measurement, performance index, and performance ratio) to measure the degradation rate in PV modules. Among these methods, I-V measurement is stated as the best method for analysing the various degradation modes.…”

“…Fig 13. Comparing I-V curves obtained using the proposed method and a traditional I-V curve tracer at a temperature of 28.1°C and an irradiance of 52 W/m2 …”

Análisis comparativo del funcionamiento de distintas tecnologías de paneles solares operando en las mismas condiciones

“…the output power of the module will be at least 90% (80%) of its initial rated power at STC after 10-12 (20)(21)(22)(23)(24)(25) years operation, associated with the manufacturing and the measurement tolerances for the module power (Vázquez and Rey-Stolle, 2008). In other words, this longterm warranty of 20 or 25 years life time can be interpreted by a typical linear degradation rate of 1 %/year (Shrestha and TamizhMani, 2015). A number of either extrinsic or inherent factors result in diverse degradation mechanisms, apparently at the cell, module or system level, contributing to a power or performance loss progression (Ndiaye et al, 2014 2016), are conducted by most PV module manufacturers on their modules to assess module reliability.…”

“…Jordan and Kurtz (2014) set an upper limitation of in-plane irradiance as 1200 W/m 2 , to reduce the occasional effect of cloud brightening. The lower limitation of irradiance aims to exclude the low irradiance performance of PV module and to avoid any shading phenomenon that can occur close to dawn and dusk (Shrestha and TamizhMani, 2015). Limited interval of performance metric values is also known as outlier filter which is essential to reduce the effect of undocumented maintenance events: snow or shading (Jordan and Kurtz, 2014).…”