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A new triple voltage boosting switched-capacitor multilevel inverter (SCMLI) is presented in this paper. It can produce 13-level output voltage waveform by utilizing 12 switches, three diodes, three capacitors, and one DC source. The capacitor voltages are self-balanced as all the three capacitors present in the circuit are connected across the DC source to charge it to the desired voltage level for several instants in one fundamental cycle. A detailed comparative analysis is carried to show the advantages of the proposed topology in terms of the number of switches, number of capacitors, number of sources, total standing voltage (TSV), and boosting of the converter with the recently published 13-level topologies. The nearest level control (NLC)-based algorithm is used for generating switching signals for the IGBTs present in the circuit. The TSV of the proposed converter is 22. Experimental results are obtained for different loading conditions by using a laboratory hardware prototype to validate the simulation results. The efficiency of the proposed inverter is 97.2% for a 200 watt load.

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Summary A new topology for solar water pumping (SWP) using a permanent magnet synchronous motor drive is proposed in this work. With the aim of overcoming the intermittency issues of solar photovoltaic (PV) generation, the utility grid is introduced in order to provide a reliable water pumping operation. The grid interface is facilitated using a Vienna rectifier, which enables the rated operation of the pump. The Vienna rectifier maintains the direct current (DC) link voltage, removes the grid current harmonics, and ensures unity power factor at the grid. A novel multi‐resonant second‐order generalized integrator frequency‐locked loop (FLL)–based approach is proposed for extraction of fundamental positive sequence components from the grid voltages. The novelty of the proposed control approach lies in the elimination of dominant lower order harmonics from the sensed grid voltages through selective harmonic elimination. The FLL structure makes the control structure flexible to grid frequency change within small range. The optimum power point of solar PV array is extracted using an incremental conductance scheme. A sensorless field‐oriented control is used for regulating the pump speed. The system ) performance is observed under different operating conditions on a laboratory developed prototype. Test results confirm the satisfactory performance and improved power quality indices fulfilling the IEEE‐519 standard.

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