Asymmetric Control of DC-Link Voltages for Separate MPPTs in Three-Level Inverters

• Published in: IEEE transactions on power electronics Vol. 28; no. 6; pp. 2760 - 2769
• Main Authors: Park, Yongsoon, Sul, Seung-Ki, Lim, Chun-Ho, Kim, Woo-Chull, Lee, Seong-Hun
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2013; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Asymmetric voltage control; Asymmetry; Capacitors; Electrical equipment; Electricity distribution; Energy efficiency; grid-connected inverter; Inverters; maximum power point tracking (MPPT); photovoltaic (PV); Photovoltaic cells; Pulse width modulation; Simulators; Switches; three-level inverter; Vectors; Voltage control
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2012.2224139

It is important to improve the overall efficiency of a photovoltaic (PV) inverter when it is connected to the grid. Fundamentally, the conversion efficiency from dc to ac power of an inverter is important. However, in the presence of partial shading, maximum power point tracking (MPPT) on PV modules is more important than the conversion efficiency. In this paper, a new control method for a three-level inverter is proposed. With the proposed method, each dc-link voltage of the three-level inverter can be asymmetrically regulated. When PV modules are split into two and each split module is connected to the respective dc-link capacitors of the inverter, the asymmetric control can be helpful because separate MPPTs are possible. The effectiveness of the proposed method was examined through experiments with a T-type three-level inverter, where each dc-link capacitor was supplied by a PV simulator emulating two separate PV modules under different shading conditions.