35.4 Use And Limitations Of 3-Phase Square Wave InverterThe three-phase square wave inverter as described above can be used to generate balanced threephase ac voltages of desired (fundamental) frequency. However harmonic voltages of 5th, 7thand other non-triplen odd multiples of fundamental frequency distort the output voltage. In manycases such distortions in output voltages may not be tolerable and it may also not be practical touse filter circuits to filter out the harmonic voltages in a satisfactory manner. In such situationsthe inverter discussed in this lesson will not be a suitable choice. Fortunately there are someother kinds of inverters, namely pulse width modulated (PWM) inverters, discussed in the nextlesson, which can provide higher quality of output voltage.
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