A THREE-STAGE SEVEN-LEVEL CASCADED H-BRIDGE INVERTER WITH WIDE INPUT VOLTAGE RANGE FOR PV APPLICATIONS
DOI:
https://doi.org/10.62985/j.huit_ojs.vol26.no2E.385Keywords:
CHB multilevel inverter, Two-stage boost converter, Wide input voltage range, Phase Disposition Pulse Width ModulationAbstract
The increasing demand for high efficiency power conversion systems with stringent power quality requirements has promoted the development of multilevel inverters. Compared to conventional inverter configurations, multi-stage inverters can produce output voltage waveforms with lower harmonic distortions and improved efficiency. This study proposes a single-phase seven-level CHB inverter in which each H-bridge module is integrated with an independent two-stage boost converter, enabling stable operation over a wide voltage range typical of photovoltaic (PV) and energy storage system (ESS) applications. A dual-loop PI-based control strategy is implemented in the boost stage to regulate the intermediate DC-link voltages and indirectly stabilize the AC output voltage in conjunction with level-shifted pulse-width modulation. Simulation results demonstrate that the proposed system maintains stable and symmetric seven-level output voltage under significant input voltage variations. The experimental results are directly compared with the simulation results to validate the accuracy of the designed model and to confirm the reliability of the suggested topology, these results clearly highlight the novelty and key advantages of the proposed structure in extending the operating voltage range compared to conventional multilevel inverter configurations that typically require high and relatively stable DC input sources.
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