Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 53, Issue 5, Pages 4695-4707Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2017.2704539
Keywords
Cascaded H-bridge inverter; level-shifted pulse width modulation (LS-PWM); power balancing; utility-scale photovoltaics (PVs)
Funding
- Council for Science, Technology, and Innovation (CSTI), Cross-Ministerial Strategic Innovation Promotion Program (SIP), Next-generation power electronics
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This paper discusses and compares phase-shifted pulse-width modulation (PS-PWM) and level-shifted PWM (LS-PWM) in a modular multilevel single-delta bridge-cell (SDBC) inverter for utility-scale grid-tied photovoltaic applications. This three-phase SDBC inverter provides the capability of operating even under power-distribution imbalances not only among three clusters, but also among cascaded bridge cells in each cluster. The main focus of this research lies in analyzing the capability of operation under severe power-distribution imbalances and presenting power-balancing methods based on zero-sequence current injection, which result in an extended power-balancing capability. This paper highlights that LS-PWM is superior to PS-PWM in both power-balancing capability and harmonic performance at the ac side of the SDBC inverter when operating under power-distribution imbalances. Experimental results obtained from a three-phase 10-kW downscaled system show good agreement with those from the theoretical analysis.
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