Automatic Detection and Characterization of Partial Shading in PV System

Identification of Partial Shading Conditions for Photovoltaic Strings

“…As shown in (17), the operating voltage V PV of the PV string equals the sum of the voltages from the insolated modules and the voltages from the shaded modules [19]. (17) where N Shaded is the number of shaded modules; V Insolated and V Shaded are respectively the voltage of the insolated modules and shaded modules.…”

“…When operating at the ith turning point V TP,i , the shaded modules are at the reverse breakdown point because of the bypass diodes. In [19], the voltage of the insolated modules is assumed to be the V OC,Module , which is the open-circuit voltage of the individual PV module. Let N i denote the number of the shaded modules with the irradiation not higher than G Shaded,i , Equation 17at the ith turning point V TP,i is rewritten as (18).…”

“…As a result, a fractional factor α i is proposed in this research to improve the accuracy of the model. The new model is as shown in (19). (19) In (19), the breakdown voltage V BD is much smaller than the voltage at turning point V TP,i .…”

“…Some researches have shown that the values of the shading information are related to the location of the turning point in the I-V curves [4], [5]. The number of shaded modules is estimated through the voltage at the turning point in [19]. The shading rate can be further estimated by this identification method.…”

Analisa Dampak Bayangan Modul Terhadap Output PLTS

“…Mengukur bayangan menjadi tantangan tersendiri karena sifat matahari yang bergerak sepanjang hari belum lagi bayangan yang mungkin juga ikut berubah akibat pengaruh lingkungan sekitar [7]. Terdapat solusi dalam mengatasi efek bayangan yakni dengan menggunakan diode bypass atau pengoptimalan daya, namun diode bypass belum sepenuhnya melindungi sel surya dari efek bayangan [8] [9]. Strategi untuk mengurangi efek bayangan adalah dengan mengamati pola bayangan pada modul karena merupakan factor utama dalam kehilangan output daya PV [9].…”