Control and Design of Microgrid Components - Power Systems ...

Size Length S
[kVA]
Table 6.2 Cable Data Summary.
Rated V
[V]
Rated I
[A]
R o
[Ω]
X o
[Ω]
R 1
[Ω]
X 1
[Ω]
Z1 AWG 1/0 180 (ft) - 480 150 0.1889 0.0084 0.0212 0.0052
Z2 AWG 3 20 (ft) 35 208 100 0.0291 0.0011 0.0049 0.00064
Z3 AWG 3 75 (yd) 35 208 100 0.3277 0.0121 0.0547 0.0072
Z4 AWG 3 25 (yd) 35 208 100 0.1092 0.0040 0.0182 0.0024
Z2n AWG 2 20 (ft) - 208 130 0.0265 0.0010 0.0037 0.00062
Z3n AWG 2 75 (yd) - 208 130 0.2979 0.0125 0.0421 0.0070
Z4n AWG 2 25 (yd) - 208 130 0.0993 0.0042 0.0140 0.0023
6.2.3 Loads
This section describes the details of the loads present in the laboratory system.
Data:
The sum of the three loads must be smaller than the total output of the microsources, so that they
can be supplied also in island mode. All loads are wye connected. Load L1 is made of two loads
in parallel, one of which has the center of the star connected to the neutral, while the remaining
loads have the center of the star floating. All loads have rated voltage of 208V and their overall
rating is about 20kW.
Load L1 through L5:
All loads are connected at star: load L1 has the center star connected to the fourth wire of the
system (neutral cable), while loads L2 through L5 have a floating center star, and they can be
connected and disconnected with a switch. Loads are identical to each other. The data for loads
is:
r
= r
L2 L3
=
2
3*120
4000
= 10.8 Ω
Since the loads are purely resistive, their reactive impedance is always zero.
Table 6.3 summarizes the data for all the loads present in our system.
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