Anonymous

# Hello, can someone solve this problem for me, how would the solution be?

A three-phase six-step inverter has a 400 V DC generator and an output frequency that varies between 25 and 100 Hz. The load is star connected and is composed of a motor with a series combination of a 20 Ω resistor and an inductance of 30 mH in each phase.

(a) Determine the range that the rms value of the fundamental frequency component of the load current travels as the frequency changes.

b) What effect does the variation of the frequency have on the DAT factor of the load current and the DAT factor of the line-neutral voltage?

Figure 1. (a) Three-phase six-pulse converter operating as an inverter.

(b) Bridge output stress for i = 150 °.

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