PUBLICATIONS
Paper
[International Journals] Ui-Min Choi, Frede Blaabjerg, and Kyo-Beum Lee, "Control Strategy of Two Capacitor Voltages for Separate MPPTs in Photovoltaic Systems Using Neutral-Point-Clamped Inverters," IEEE Transactions on Industry Applications, vol. 51, no. 4, pp. 3295–3303, Jul./Aug. 2015. -SCI
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The centralized topology with three-level inverters are widely used in photovoltaic (PV) systems due to their less installation costs
and complexity. However, the common maximum power point tracking (MPPT) is a disadvantage of the centralized topology
particularly under the partial shading and panel mismatch conditions. In this system, if PV modules are separately connected to the
split capacitor voltage, the MPPT efficiency can be improved by the proposed control strategy. By the proposed method, the two
capacitor voltages can be controlled asymmetrically to perform the separate MPPTs of each PV module connected to separate
capacitors. The outputs can be generated without distortion even if two capacitors are asymmetrically regulated. Simulation and
experimental results verify the validity and feasibility of the proposed methods.
