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the bus voltage magnitude and frequency at that instant.
False. Described by differential equations. (Load modeling – slide #10)
NAME:
3. Equivalent Circuits (35 points): Consider the following equivalent circuits for a 483 MVA (3phase), 24kV
(linetoline RMS), 0.9 power factor, 60Hz, 3 phase, 2 pole synchronous generator, which has the following
inductance and resistance parameters in per unit values in the Lad–Laq base per unit system and opencircuit time
constants in seconds:
Ld=1.800
Lq=1.720
Ll=0.17
Ra=0.0027
L’d=0.285
L’q=0.490
L”d=0.220
L”q=0.220
T’d0=3.7 s
T’q0=0.48 s T”d0=0.032 s T”q0=0.06 s
The transient and subtransient parameters are based on the classical definitions and unsaturated values of Lad
and Laq. a. Determine per unit values of fundamental parameters, i.e. all inductances and resistances in the d and qaxis equivalent circuits
b. Explain why inequalities Ld>L’d>L”d and T’d0 >> T”d0 hold
c. If ifd base (iFbase)=1875A. Determine the following parameters in mH or .
Ll, Ld, Lq, Lad, Laq, MF (i.e. Lafd in Kundur’s book), LF (i.e. Lffd in Kundur’s book), Lfd, Rfd and
Ra
d. Determine transfer function Ld(s)
a (Kundur’s Example 4.1 in Page 153) ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ ⁄
⁄ 10’
b ⁄ ⁄ ⁄ ⁄ ⁄ ⁄ 2’
c (Kundur’s Example 3.1 in Page 90, slide #48)
√
√...
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 Spring '12
 Monica

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