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The utility-scale renewables, PV and wind, are already approaching grid parity. To further enhance their penetration rapidly requires additional cost reduction and increased efficiency. There are other applications in utility-scale energy storage systems and in substations with power ratings in MW range for rapid charging of multiple electric vehicles. Towards this goal, one approach to interface...
Voltage source inverters (VSIs) are used in electric drives to generate a variable frequency, variable amplitude voltage for motor control. In addition to the desired three-phase output voltage, VSIs also generate high-frequency common-mode voltage that causes shaft voltage and stray currents; that in turn cause EMI and motor failure. VSIs also need a stable DC voltage input that is generated from...
This paper presents a commutation technique to overcome the effects of transformer leakage inductance in a single stage high frequency ac-link transformer isolated inverter. The presence of leakage inductance causes large voltage spikes across the transformer due to the switched nature of link current that is encountered in direct high frequency ac link to low frequency ac conversion. This paper proposes...
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