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./ > Paper

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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

2015

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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. 

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