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Optimal harmonic mitigation strategy based on multiobjective whale optimization algorithm for asymmetrical half-cascaded multilevel inverter

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Abstract

One of the most significant issues related to the innovational multilevel inverters is the creation of high-step staircase quasi-sinusoidal voltage even with low number of semiconductors. In this paper, an innovational asymmetrical half-cascaded multilevel inverter (AHCMLI) is essentially proposed to solve this problem. The half-cascaded part of AHCMLI has operated as zero-positive level creator, and then, H-bridge part renders the perfect staircase quasi-sinusoidal voltage. The values of DC power sources of proposed AHCMLI have been defined based on an ingenious mathematical formula. On the other hand, due to the presence of high-order harmonics in output voltage of AHCMLI, they must be optimally mitigated. In this regard, an effectual and optimal rectangular notch–selective harmonic elimination–pulse width modulation (RN-SHEPWM) based on propagation proportion is suggested to simultaneously mitigate the twenty-ninth, thirty-first and thirty-fifth harmonics. Due to the multiobjective nature of the understudy problem and its special importance, it has been formulated based on multiobjective whale optimization algorithm (MOWOA). Finally, both the simulation and experimental results have decisively validated the level creation capability of proposed AHCMLI as compared to other structures. The values of twenty-ninth, thirty-first and thirty-fifth harmonics have been, respectively, mitigated to 0.0002857, 0.0003402 and 0.00029 using optimal RN-SHEPWM based on MOWOA.

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Acknowledgements

This study was supported by a dedicated grant from Islamic Azad University, Shadegan Branch, Iran: the grant entitled: “proposing new asymmetric multilevel inverter to reduce the number of semiconductor devices and increase the number of quasi-sinusoidal voltage levels.”

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  1. Department of Electrical Engineering, Shadegan Branch, Islamic Azad University, Shadegan, Iran

    Ali Darvish Falehi

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Correspondence to Ali Darvish Falehi.

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Darvish Falehi, A. Optimal harmonic mitigation strategy based on multiobjective whale optimization algorithm for asymmetrical half-cascaded multilevel inverter. Electr Eng 102, 1639–1650 (2020). https://doi.org/10.1007/s00202-020-00983-y

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