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http://dx.doi.org/10.6113/TKPE.2013.18.5.448

Control Method of Distributed-Module Type Photovoltaic Power Conditioners under Stand-alone Operation  

Seo, Jung-Won (Dept. of Electrical Engineering, Soongsil University)
Park, Joung-Hu (Dept. of Electrical Engineering, Soongsil University)
Kim, Hye-Rim (Korea Electric Power Research Institute)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.18, no.5, 2013 , pp. 448-457 More about this Journal
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.
Keywords
stand-alone; distributed module; module-integrated; photovoltaic; power conditioner;
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