This article presents a 21-level cascaded asymmetric inverter with a reduced switch count. The system uses a solar photo voltaic (SPV) source and a battery as well. The topology of the proposed 21-level inverter needs 3 three power supplies with voltages in the ratio 1:2:7. The two lower voltage levels in the ratio V and 2 V are connected in series. In contrast, the third one, which is in the 7 V level, is isolated. The proposed idea uses a step modulation strategy. The step angles are selected strategically by fixing the switching angles at predetermined values. The proposed idea has been validated using simulations in MATLAB SIMULINK platform. An experimental prototype has also been developed to validate the proposed concept.
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Ramachandran et al. (2024) studied this question.
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