IEEE Electrification Magazine - September 2016 - 40
Time (s)
(a)
(b)
Demanded Power at Substation 1
Demanded Power at Substation 2
1.2
Time (s)
Time (s)
(c)
(d)
400
350
300
250
200
0
100
0
0
0.2
450
0.2
400
0.4
350
0.4
300
0.6
250
0.6
200
0.8
100
0.8
50
AB
1
50
1
150
AB
450
100
Time (s)
1.2
0
AB
50
650
0
450
400
350
300
250
200
150
100
50
0
650
700
AB
450
750
400
750
350
800
300
800
250
850
200
850
150
900
700
P (MW)
Substation 2 Voltages with and
Without On-Board Accumulation
900
150
V (V)
Substation 1 Voltages with and
Without On-Board Accumulation
Figure 12. Substation powers and voltages. The red and blue colors represent, respectively, the conventional and on-board accumulation
scenarios.
50
45
Energy (kWh)
40
35
30
25
20
15
10
5
0
0
50 100 150 200 250 300 350 400 450
Time (s)
Figure 13. The total energy consumption at both substations. The
red and blue colors represent, respectively, the conventional and
on-board accumulation scenarios.
40
I E E E E l e c t r i f i c ati o n M agaz ine / SEPTEMBER 2016
and the energy level of the accumulation system [black
and blue curves of Figure 11(e) and (f)] is also self-evident.
The relation between the voltage and power profiles
in train and substations. For instance, during the first
50 s, only train 1 is active, and it is in traction mode with
the accumulation system discharged. In this case, the
power profile is exactly the same as the voltage profile
in the train but also in the substations. The train is near
substation 1, so most of the power is demanded from
this substation (power profile of the train 1 and substation 1 are nearly the same). The profile of power
demanded from substation 2 is also similar.
From the point of view of the dc traction system
analysis and also for understanding the behavior of
the train with the accumulation system, it is interesting to study the time intervals labeled as A and B in
Figure 11 and Figure 12. In A, train 1 is braking, and the
traction system regenerates more than 450 kW; in both
scenarios, the train injects in the catenary around
Table of Contents for the Digital Edition of IEEE Electrification Magazine - September 2016
IEEE Electrification Magazine - September 2016 - Cover1
IEEE Electrification Magazine - September 2016 - Cover2
IEEE Electrification Magazine - September 2016 - 1
IEEE Electrification Magazine - September 2016 - 2
IEEE Electrification Magazine - September 2016 - 3
IEEE Electrification Magazine - September 2016 - 4
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IEEE Electrification Magazine - September 2016 - Cover3
IEEE Electrification Magazine - September 2016 - Cover4
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