Page 253 - Renewable Energy Devices and System with Simulations in MATLAB and ANSYS

240 Renewable Energy Devices and Systems with Simulations in MATLAB and ANSYS ®
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TABLE 9.6
DC-Excited Synchronous Generator Parameters and Features (7.6 MW,
11 rpm, 3.6 kV)
Dsi (m) 11.768 Stator inner diameter
Dso (m) 12 Stator outer diameter
Dri (m) 11.491 Rotor inner diameter
Lg (m) 0.98 Magnetic core length
hag (mm) 3.25 Air-gap height
hag max /hag 1.2 Maximum air gap/minimum air gap
q1 2 Number of slots per phase per pole
Turns per coil 12
Parallel path 180
hst (mm) 25.5 Stator slot total height
hs1 (mm) 20 Height of stator slot filled with copper
Ws (mm) 14.7 Width of the stator slots
So (mm) 7. Stator slot opening
wrt (mm) 105 Rotor pole width
wrps (mm) 170.4 Rotor pole shoe width
mg (ton) 80.0 Active material weight
Etan (%) 94.54 Efficiency at pure resistive power factor
Pcun (kW) 237.61 Stator copper losses
Pex0n (kW) 34.68 Excitation, load losses
Pexn (kW) 84.13 Excitation losses at rated resistive load
Pfen (kW) 96.69 Iron-rated losses
Stator linkage flux (Wb) 2.96/2.79 Analytical/FEM
Xd (pu) 0.878/0.824 d-axis reactance per unit (analytical/fem)
Xq (pu) 0.586/0.443 q-axis reactance per unit (analytical/fem)

R
3.5 0.8 RL
0.6 RL
L
3 0.8 RC
Excitation current (pu) 1.5 2
0.6 RC
C
2.5

0.5 1

0
0.2 0.4 0.6 0.8 1 1.2
Load current (pu)

FIGURE 9.27 Excitation current versus load current of DCE-SG (R, L, and C are resistive, inductive, and
capacitive loads, and RL and RC are resistive inductive and resistive capacitive loads).