Six step three phase inverter given Vdc, f range, R, L, wye load determine effec

Question

Six step three phase inverter given Vdc, f range, R, L, wye load determine effect on THD of Vphase For the six-step three-phase inverter of the figure below, the dc input is 400 V and an output frequency that varies from 25 to 100 Hz. The load is a Y connection with a series RL connection with R = 10 Ohm and L = 30 mH inductance in each phase. What is the effect on the total harmonic distortion (THD) of the line-to-neutral voltage, V_L-N, as the frequency is varied from 25 to 100 Hz (Select the one best answer from the choices given below.) (a) THD_V, L-N increases approximately by a factor of four (from 27% to 7%) (b) THD_V, L-N increases approximately by a factor of two (from 10% to 5%) (c) THD_V, L-N remains constant (at approximately 27%) (d) THD_V, L-N decreases approximately by a factor of two (from 5% to 10%) (e) THD_V, L-N decreases approximately by a factor of four (from 7% to 27%)

Explanation / Answer

Correct option is C. % THD does not depend on the frequency. Whatever may be the load the voltage THD is constant. Whereas the current THD depends on the type of the load.

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.