, . .
( ) (I, U) , , (n =1).
(I, U) (Imax, Umax) , .
, , :
, , :
, , . , , , .
. 1- 3- , :
a) , (. 124),
) , (. 124).
(U), (Umax) (U) , , (V 1 , V 2 - Umax V 3 - U) .
U, B | Umax, B | U cp,B | V 1 | V 2 | V 3 | |
) | 71,1 | 65,8 | 71,1 | 63.6 | 73,0 | |
) | 71,1 | 61,6 | 71,1 | 77,8 | 68,4 |
, , ( 10 %).
D t = T /3 , : 1 D wt = = 120, 2 D2 wt = 2× = 240= -120, 3 D3 wt = 3× = 360 = 0, . .
, = 3 n -2 (n = 1, 2, 3), .. 1-, 4-, 7- .., , , . = 3 n +1 (2-, 5-, 8- ..) , , . =3 n (3-, 6-, 9- ..) , .. , , , .
|
|
, () (. 125).
|
B :
uA (t) = U 1 m sin wt +U 2 m sin2 wt + U 3 m sin3 wt +
uB (t) = U 1 m sin(wt - 120) +U 2 m sin(2 wt + 120) + U 3 m sin3 wt +
uC (t) = U 1 m sin(wt +120) + U 2 m sin(2 wt - 120) + U 3 m sin3 wt +
1-, 2- 3- . 126, , .
, uAB = uA - uB. . 9 , ( ) ( ):
uAB (t) =
uBC (t) =
uCA (t) =
:
;
, ( ) , . : - . , , , 9- , , U 0 U 3 , U 3 m U 0 - 3- .
, , , , , 3 U0. , , . . .
, , , . 1- . 2- , . , , .
|
|
, , .
, , 2 .
. (. 127) ( , , . , :
uA = 200sin wt + 50sin3 wt + 20sin5 wt
: 1) , 2) () , 3) .
1- ( ):
3- ( ):
5- ( ):
.
:
B, .
:
A
A
A
A
, .
PA = I 2 A×RA = 0.9762×150 = 142.9
PB = I 2 B×R B = 1.1082×120 = 147.3
PC = I 2 C×RC = 0.8652×100 = 74.8
P = PA + PB + PC = 365