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A Study on the MPPT Control Method for Grid-connected Multi-String Three-Phase Three-Level PV Inverter  

Kim, Jinsoo (Electronic Engineering of Cheong-ju University)
Yang, Oh (Semiconductor Engineering of Cheong-ju University)
Publication Information
Journal of the Semiconductor & Display Technology / v.13, no.4, 2014 , pp. 43-48 More about this Journal
Abstract
Two-level inverter has some disadvantages like high harmonics contained in the output current, efficiency limit and stress to switching device as IGBT and FET. Many researches have reported multi-level inverter to complement two-level inverter of problems. In this paper, we suggest MPPT algorithm of multi-string three-level solar inverter that considered nowadays. We added midpoint controller in order to implement the MPPT algorithm because the three-level inverter has to need midpoint controller and procured the stability of direct current link. We verify the superiority of multi-string T-Type inverter and the algorithm we suggested with solar irradiance variation experiment and MPPT efficiency measurement. The MPPT efficiency was confirmed with a high efficiency more than 99.97%.
Keywords
Grid-Connected; Multi-String PCS; T-Type Inverter; 3-Level PCS; Maximum power point tracking; Photovoltaic power system; P&O Algorithm;
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Times Cited By KSCI : 3  (Citation Analysis)
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