|
Parameters of structural diagram |
13.1 |
|
| 7.1.4 Calculation of structural diagram coefficients. [L1,
section 6.5] |
| Rated
load modes |
| In all
formulas, we assume that Re = 0 |
|
|
= Re2+(Xq + Xe)·(Xd′ + Xe)=0 +(2.33+0.4)·(0.307+0.4) = 1.93 |
|
|
|
| K1
— change in electromagnetic torque during a small change in
rotor angle and constancy of flux linkage along d axis, i.e.
synchronizing torque |
| K1= |
[ |
|
] |
Eq′=Eq0′ |
= |
kо |
· |
U∞ |
· |
{ |
Eqao |
· |
[ |
Re |
· |
| |
sin(δ−α) |
|
|
+ |
|
|
+ |
(Xd′+Xe)·cos(δ−α)] |
+ |
Jaqo |
· |
(Xq−Xd′) |
· |
[ |
(Xq+Xe) |
· |
|sin(δ−α)| |
− |
|
|
− |
Re |
· |
cos(δ−α) |
] |
} |
=0.51·0.65·[ 3.2·(0.307+0.4)·0.39 |
+ |
|
|
+0.33·(2.33−0.307)·(2.33+0.4)·0.92] =0.33·[ 0.85 + 1.72 ] = 0.85 |
| K2
— change in electromagnetic torque during a small change in
flux linkage along d axis and constancy of rotor angle |
| K2 |
= |
[ |
|
|
] |
δ = δ0 |
= kо·{Jaq0·[Re2+(Xq+Xe)2]+Ead0·Re} = |
|
|
= 0.51·0.34·(2.33 + 0.4)2 = 1.29 |
| K3
— reflects the influence of external resistance, independent
of load |
| K3 |
= |
|
|
|
= |
|
1 |
|
1+0.51·(2.33−0.307)·(2.33+0.4) |
|
=0.26 |
|