Model Identification of Photovoltaic Generating Stations Simulation Testbed M File Codes: Photovoltaic Generating Stations ,A Simulation Testbed, M File Codes

by Ali Keyhani

This report presents a photovoltaic (PV) model of generating station simulation testbed as M File codes. The estimation uses the PV panel data of manufacture. The model is based on a single-diode model of a PV cell. A photovoltaic panel is commercially available in the form of a module in which a number of cells are connected in series. However, for large power and voltage applications, a combination of these modules is needed. A number of modules are connected in series to give a higher voltage. This series combination of the modules is called a string. For increasing the current rating of the source, these strings are connected in parallel to form an array. Design for 80 kW generating station is presented. The maximum system voltage specified by the National Electric Code (NEC) is 600 V. The system voltage as defined by NEC is 1.25 times the open circuit voltage at standard test condition (STC). For PV-MF165EB3 modules, the open-circuit voltage at STC is 30.4 V. Therefore, a maximum of 15 modules can be connected in series to form a string. If the array is controlled to operate at MPP, and if all modules in the array are identical in all respects and assumed to operate under identical environmental conditions, then each module in the array also operates at MPP. At MPP under STC, the array voltage is 363 V and the power produced by one module is 165.29 W, and hence by one string is 2.47 kW. Therefore, 32 strings in parallel produce approximately 80 kW of power. The cell model of a module is extended to estimate the parameters of arrays. The variation of the parameters with change in temperature and irradiance is also studied. Finally, estimation of the maximum power point (MPP) from the estimated parameters at varying environmental conditions is presented.

43 pages, Kindle Edition

Published October 12, 2018