A New Single-Source Nine-Level Quadruple Boost Inverter (NQBI) for PV Application

 Abstract

Multi-level inverters (MLIs) with switched capacitors are becoming popular due to their utilization in AC high-voltage applications as well as in the field of renewable energy. To achieve the required magnitude of output voltage, the switched capacitor (SC) technique employs a lesser number of DC sources in accordance with the voltage across the capacitor. Designing an efficient high-gain MLI with fewer sources and switches needs a rigorous effort. This paper introduces a prototype of a nine-level quadruple boost inverter (NQBI) topology powered by one solar photo-voltaic source using fewer capacitors, switches, and diodes when compared to the other SC-MLIs topology. The suggested NQB inverter produces nine levels of voltage in its output by efficiently balancing the voltages of the two capacitors. The various SC-MLIs are compared in order to highlight the benefits and drawbacks of the proposed nine-level quadruple boost inverter (NQBI) topology. To validate the efficacy of the proposed solar photovoltaic based NQBI without grid connection, detailed experimental results are presented in a laboratory setting under various test conditions.

Keywords

 NQBI, reduced switch count, switched capacitor inverter, SPWM technique.

Schematic Diagram:

Figure 1. Schematic Diagram Of Proposed Inverter Based Off-Grid Pv System With Ac Loads.

Expected Simulation Results:

Figure 2. Experimental Waveforms At Modulation Index 1 (A) Output Vol The Dc-Dc Converter, (B) Capacitor Voltage Vc1, (C) Capacitor Voltage Vc2 (D)Output Voltage And Current At Zl D 160 And (E) Output Voltage And Current At Zl D 160 C 200 Mh.

Figure 3. Experimental Waveforms At Modulation Index 0.5 (A) Output Vol The Dc-Dc Converter, (B) Capacitor Voltage Vc1, (C) Capacitor Voltage Vc2 (D) Output Voltage And Current At Zl D 80 C 200 Mh.

Figure 4. Experimental Waveforms Of (A) Output Voltage And Current Output Under Voltage Variation Of Dc -Dc Converter From 30v To 18v And (B) Output Voltage And Current Under Load Variation From Zl1 D 160 C 200 Mh To Zl2 D 80 C 200 Mh.

Conclusion

A reduced-switch, nine-level, switched-capacitor-based quadruple boost inverter topology is proposed in this paper. The NQBI is suggested for PV applications by using a solar PV panel as the only source. Though the inverter topology employs two capacitors of unequal voltage rating, the capacitor voltage equilibrium is established without employing an additional voltage balancing strategy. The comparative study shows that the proposed nine-level inverter topology has several advantages over other popular nine-level switched-capacitor inverter topologies, such as performance, total component count, and manufacturing cost. Finally, the results from the experiments show that the proposed NQB inverter-based PV system can work.

References

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