Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Control Method of Distributed-Module Type Photovoltaic Power Conditioners under Stand-alone Operation
Authors Jung-Won Seo ; Joung-Hu Park ; Hye-Rim Kim
DOI 10.6113/TKPE/2013.18.5.448
Page pp.448-457
ISSN 1229-2214
Keywords stand-alone; distributed module; module-integrated; photovoltaic; power conditioner
Abstract This paper proposes a control method under stand-alone operating mode for distributed-module type photovoltaic power conditioners. In conventional schemes, there are some problems of a controller saturation in the DC-link (or load) voltage controller when overly-heavy load, light load, and the generated PV power reduction occurs, as well as when a transition occurs from an overly-loaded to normal conditions. To overcome these problems, the proposed controller method switches the main control target from DC-link voltage to the maximum power point, which is closer to the stable operating point when it returns to normal operating conditions. For the analysis, a state-plane trajectory was given and the circuit analysis by PSIM simulation was done. For the verification, a prototype hardware with 110[W] and 50[W] dual photovoltaic modules has been implemented. From the results, it can be seen that PV power tracking is successfully done with the proposed method even under a stand-alone operation mode.