8.6 A three-phase transistor voltage-source inverter supplies a three-phase load, as shown in Fig.8.41. The load consists of star connected resistance of 10 2 in each phase. The inverter supply voltage is 200V d.c. and each inverter switch conducts for 120°. (a) Sketch the switching signals for the six transistors. (b) Sketch the line-to-neutral voltage for one complete cycle of the output voltage. (c) Sketch the line-to-line voltage for one complete cycle of the output voltage.

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8.6 A three-phase transistor voltage-source inverter supplies a three-phase load,
as shown in Fig.8.41. The load consists of star connected resistance of
10 in each phase. The inverter supply voltage is 200V d.c. and each
inverter switch conducts for 120°.
(a) Sketch the switching signals for the six transistors.
(b) Sketch the line-to-neutral voltage for one complete cycle of the
output voltage.
(c) Sketch the line-to-line voltage for one complete cycle of the
output voltage.
438
Power Electronics and Drives
(d) Calculate the rms values of the first five harmonics in the line-
to-line output voltage, including the fundamental.
(e) Calculate the rms values of the first five harmonics in the line-
to-neutral output voltage, including the fundamental.
[ Ans: (d) VL-L=244.95 V, (e) Vph=141.42 V]
Q1
Q3
Q5
Vac
200V
Fig.8.41.
Q4
120°
conuction
Q6
K
Q2
1092
1092 n
ww
1092
Transcribed Image Text:8.6 A three-phase transistor voltage-source inverter supplies a three-phase load, as shown in Fig.8.41. The load consists of star connected resistance of 10 in each phase. The inverter supply voltage is 200V d.c. and each inverter switch conducts for 120°. (a) Sketch the switching signals for the six transistors. (b) Sketch the line-to-neutral voltage for one complete cycle of the output voltage. (c) Sketch the line-to-line voltage for one complete cycle of the output voltage. 438 Power Electronics and Drives (d) Calculate the rms values of the first five harmonics in the line- to-line output voltage, including the fundamental. (e) Calculate the rms values of the first five harmonics in the line- to-neutral output voltage, including the fundamental. [ Ans: (d) VL-L=244.95 V, (e) Vph=141.42 V] Q1 Q3 Q5 Vac 200V Fig.8.41. Q4 120° conuction Q6 K Q2 1092 1092 n ww 1092
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