Also Available Domains |Multilevel Converters
The main objective this paper is to reduce the fluctuations in the DC-bus voltage under the change in solar insolation level and provides appropriate voltage balancing for Three Phase NPC Based Grid Integrated Single Stage Solar PV System.
This work proposes an effective reduction in the capacitor size of the DC-bus of a conventional three-phase neutral point clamped (NPC) inverter-based grid integrated single-stage solar photovoltaic (PV) system. This has been done by implementing a metallized polypropylene film DC-bus capacitor instead of an electrolytic capacitor. As an outcome, this enhances the system’s long-term reliability, reduces cost, and increases the system’s life expectancy. The unbalance in capacitor voltage due to a small DC-bus capacitor is also identified. As a solution, a carrier-based modified modulation strategy is implemented to improve the dynamic response of neutral-point voltage. A single-stage solar PV array is utilized in this paper.
Index Terms—Solar PV array, DC-bus Capacitor, Grid-integrated inverter, Capacitor voltage balancing, Harmonic reduction.
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