Generation Power Compensation System using Electric Double Layer Capacitor for Partially Shaded Series PV Modules

摘要

Generation power of a photovoltaic (PV) array deeply depends on surrounding conditions like temperatures and solar insolation. In particular, the power generated from PV modules in series is drastically reduced when they are partially covered by shade. To address the problem, a power compensation system using Electric Double Layer Capacitors (EDLC) is presented in this paper. In this system, the output power of the shaded PV module is efficiently obtained and utilized, so that the total output power is controlled to maximum according to the solar insolation. The control characteristics of the proposed system are examined by simulation and experimental verification. From those results, it is confirmed that the control strategy are valid to avoid the significant reduction of generation power due to the partial-shading.