8/6/2019 Contoh cycloconverter

1/1

Contoh Soal :

Vs = 220 V, fs = 50 Hz, fo = 25 Hz, R = 5 , L = 40 mH, p = 2 /3,

o = 2 x fo = 2 x 25 = 157 rad/s, XL = L = 157 x 40 mH = 6,28

a. Untuk 0 < < , tegangan output rms adalah

21

2

2sin1

+=

So

VV

= 97,5 volt

b. Z = [R2 + ( oL)2]1/2 = [52 + 6,282]1/2 = 8 , = tan-1 ( oL/R) = tan

-1 (6,28/5) = 51,47o

Arus rms beban = Io = Vo/Z = 97,5/8 = 12,19 A

Arus setiap konverter IP = IN = Io/2 = 12,19/2 = 8,62 A

Arus setiap thyristor IR = IP/2 = 8,62/2 = 6,09 A

c. Arus input IS = Io = 12,19 A

Daya VA = VS.IS = 220 x 12,19 = 2681,8 VA

Daya output = Po = Vo Io cos = 97,5 x 12,19 x cos 51,47o = 740,36 watt

Faktor daya input = PF = Po/VA = Po/VSIS = 740,36/2681,8 = 0,28