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Switched capacitors-based single-phase seven-level photovoltaic inverter with self-voltage balancing

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Abstract

In this paper, a novel switched capacitors-based seven-level photovoltaic inverter having self-voltage boosting with reduced power switches is analyzed. It has voltage boosting capability with a possibility of 1.5 times of maximum voltage level to input DC voltage. In the proposed topology, higher voltage gain does not impose high voltage stress on any power switches. Therefore, the peak inverse voltage (PIV) of all power switches does not exceed the input source voltage. Furthermore, only a single source is enough, and voltage balancing of capacitors is not required as capacitors are balanced through the charging and discharging phenomenon. A simple modulation technique is used for generating a suitable switching pulses for the inverter. A comparative analysis is presented with other switched capacitors multilevel inverter in terms of the number of power switches, total standing voltage, PIV, and cost function. The closed-loop structure of proposed inverter is investigated with specified controlling and implemented in MATLAB/Simulink and validated through hardware-in-the-loop real-time simulation in OPAL-RT. Additionally, an experimental prototype of the proposed topology in open as well as closed loop is built and tested to validate its efficacy.

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Authors and Affiliations

  1. Thapar Institute of Engineering and Technology, Patiala, Punjab, India

    Ritika Agarwal, Krishna Kumar Gupta & Shakti Singh

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  1. Ritika Agarwal
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  2. Krishna Kumar Gupta
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  3. Shakti Singh
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Agarwal, R., Gupta, K.K. & Singh, S. Switched capacitors-based single-phase seven-level photovoltaic inverter with self-voltage balancing. Electr Eng 104, 3107–3117 (2022). https://doi.org/10.1007/s00202-022-01535-2

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