Three-Phase Modular Cascaded H-Bridge Multilevel Inverter with Individual MPPT for Grid-Connected Photovoltaic Systems

Conference · Tue Jan 01 00:00:00 EST 2013

OSTI ID:1093759

Xiao, Bailu ^[1]; Hang, Lijun ^[1]; Riley, Cameron ^[2]; Tolbert, Leon M ^[1]; Ozpineci, Burak ^[1]

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1. ORNL
2. University of Tennessee, Knoxville (UTK)

A three-phase modular cascaded H-bridge multilevel inverter for a grid-connected photovoltaic (PV) system is presented in this paper. To maximize the solar energy extraction of each PV string, an individual maximum power point tracking (MPPT) control scheme is applied, which allows the independent control of each dc-link voltage. PV mismatches may introduce unbalanced power supplied to the three-phase system. To solve this issue, a control scheme with modulation compensation is proposed. The three-phase modular cascaded multilevel inverter prototype has been built. Each H-bridge is connected to a 185 W solar panel. Simulation and experimental results are presented to validate the proposed ideas.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Power Electronics and Electric Machinery Research Facility
• Sponsoring Organization: USDOE
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1093759
• Resource Relation: Conference: 2013 28th Annual IEEE Applied Power Electronics Conference and Exposition (APEC), Long Beach, CA, USA, 20130317, 20130321
• Country of Publication: United States
• Language: English