CHAPTER 2
inverter (VSI) is one in which the dc source has small or negligible impedance. The. voltage at the input terminals is constant. A current–source inverter (CSI) is fed with. source. controlled turn
In today's world, inverters play a vital role in various applications, such as home solar power system, inverter for office use, inverter for van, etc. Central to their operation is the concept of an inverter frequency, which determines the rate at which the current alternates direction.
The conventional three-phase, six-switch dc to ac voltage-source inverter is shown in figure 17.7. Each of the three inverter legs has an output which can provide one of two voltage levels, Vs, when the upper switch (or diode) is on, and 0 when the lower switch (or diode) conducts.
17. 2 DC -to -ac c ontrolled current-source inverters In the current source inverter, CS I, the dc supply is of high reactance, being inductive so as to maintain the required inverter output bidirectional current independent of the inverter load. At medium and low power levels CS Is use self commutating devices, as shown in figure 17.
The terms voltage-fed and current-fed are used in connection with the output from inverter cir cuits. A voltage-source inverter (V S I) is one in which the dc input voltage is essentially constant and independent of the load current drawn. The inverter specifies the load voltage while the drawn current shape is dictated by the load.
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