Thus, the Voltage Source Inverter is frequently called a six-step inverter. Because the waveform is periodic, it contains a fundamental component of voltage as well as higher-order harmonics whose harmonic numbers are given by $h=6n\pm 1$ where n is an integer from 1 to infinity.
H.J. Kim In Voltage Source Inverter (VSI), the DC voltage source is at the input side of converter, thus the polarity of the input voltage remains the same. However, the polarity of the input DC current determines the direction of average power flow through the inverter.
There are two major classifications of the inverter, namely, voltage source inverter and current source inverter. Voltage source inverter changes the dc form of voltage into ac form, likewise a current source inverter changes dc form of current into ac form.
An ideal voltage source inverter keeps the voltage constant through-out the process. A VSI usually consists of a DC voltage source, voltage source, a transistor for switching purposes, and one large DC link capacitor. A DC voltage source can be a battery or a dynamo, or a solar cell, a transistor used maybe an IGBT, BJT, MOSFET, GTO.
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