|
8.3. Generator Stability During Operation in the Power Grid
|
25.1
|
During power oscillations demanded by the power grid, oscillations
arise between individual parallel-operating generators within this
grid. Fig. 13 illustrates the control system block diagram under
disturbances that occur as a result of changes in the generator
angle δ. In this closed-loop diagram, the sources of disturbances
are the variations in the feedback loop under zero reference
command.
|
|
According to Fig. 13:
|
| Gвпр(p) |
= |
Gзв(p) |
· |
G5 |
· |
GГ1(p) |
= |
|
· |
885 |
· |
|
|
· |
|
0.00638 · p·(1 + p · 5)(1 + p·2.4) |
|
(1 + p · 0.55)6 |
|
|
|
| at p =1: |
K = |
0.052·885·0.00638·5·2.4 |
= |
3.52 |
|
|
The feedback paths regarding reactive current:
|
|
|
= |
|
|
|
= |
|
(1+p·0.6)·(1+p·0.03) 2 |
| 0.52·(1+p·0.156)·(1+p·0.5) |
|
· |
|
|
· |
|
· |
|
p·(1+p·5)·(1 + p · 2.4)2 |
|
18.96· (1 + p · 0.55)6 |
|
|
|
|
at p = 1:
|
K = |
5 · 2.42 |
= 64 |
|
0.52· 0.019 · 2.4 · 18.96 |
|