Advanced International Journal for Research

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Volume 7 Issue 3
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Solar Power Enhancement Using Switched- Capacitor Based Seven-Level Inverter

Author(s) Mahi Malode, Maithili Patil, Nisha Khatri, Sakshi Ghogare
Country India
Abstract This research paper presents a seven-level inverter for photovoltaic grid integration that requires only six power semiconductor devices. The system utilizes a DC-DC boost converter coupled with a transformer to establish two voltage sources with a 2:1 relationship, feeding a cascaded topology that combines a capacitor selection stage and a full-bridge conversion unit. Seven voltage levels are produced (Vdc, 2Vdc/3, Vdc/3, 0, - Vdc/3, -2Vdc/3, -Vdc), resulting in improved harmonic characteristics and reduced electromagnetic emissions. In this design only one switch operates at high-frequency at any moment, decreasing switching losses and boosting efficiency. Voltage balancing across DC-link capacitors occurs inherently through the circuit's voltage relationships, eliminating the need for additional control mechanisms. Hardware prototypes were constructed and tested, with experimental findings confirming the viability of this approach. Measurements reveal a total harmonic distortion of 3.6%. Traditional diode-clamped and flying-capacitor topologies demand twelve switches for comparable voltage levels, while cascaded H-bridge designs need eight switches—the proposed circuit achieves similar results with fewer components. Benefits include reduced conduction losses, simplified circuitry, and higher power density. The multilevel output reduces filter inductor size relative to two-level designs. Operation remains stable across different solar irradiation levels while regulating DC-link voltages. Incorporating maximum power point tracking and model predictive control techniques in future iterations could optimize energy harvest and grid synchronization
Keywords Seven Level Inverter, DC-DC Boost converter, Voltage Balancing, Cascaded Topology, Low THD
Published In Volume 7, Issue 2, March-April 2026
Published On 2026-04-24
DOI https://doi.org/10.63363/aijfr.2026.v07i02.5193
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E-ISSN 3048-7641
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