A CONSIDERATION ABOUT MPPT PERFORMANCE INFLUENCED BY A BUILDING’S SHADOW
DOI:
https://doi.org/10.59627/cbens.2010.1689Palavras-chave:
MPPT, Stepped I-V characteristic, Partial ShadowResumo
A current-voltage (I-V) characteristic of a Photovoltaic (PV) module variously changes and often includes multiple steps affected by partial shadows. The stepped I-V characteristic makes it difficult for Maximum Power Point Tracker (MPPT) to find the real Maximum Power Point (MPP) because a local MPP occurs on each step. In this study, a roof top PV array (3x3) affected by a partial shadow is assumed and discussed about the output energy based on the simulation results. At first, the performances of four types of MPPT’s, the perturb and observation (P&O), the incremental conductance (IncCond), the constant voltage (CV), and the scanning methods, are compared under the condition of the intentional partial shadows which cause a local MPP. Then, the roof top PV array affected by a shadow of a mid-to-high-rise building in front of or diagonally in front of the PV array is assumed. The shadow casted by the building moves with the diurnal movement. The I-V characteristics are calculated every 0.01 (s) based on the measured irradiation dataset by 1.0 (s) using the linear approximation. The trends of the MPPs and the total output energies are shown, compared, and discussed. The interval between the scans affected the output energy. The nearby building not in front of the PV array but diagonally in front of the PV array greatly influenced on the output energy.
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