Guiding the Selection and Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities (2010) / Chapter Skim
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From page 17... ...
Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 15 of 61 Sustainable Discharge Time Based on Vendor Data 1 10 100 1,000 10,000 100,000 100 1,000 10,000 Power (kW)
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 16 of 61 payback periods were exceedingly long. Simulation results validate this assumption.
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 17 of 61 Figure 5-1: Power control diagram for vehicles In the motoring mode, • If the train voltage is above Vmt (referred to as motoring taper voltage) , the train's power demand can be fully met by the traction power system.
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 18 of 61 moveable nodes, whose locations change with time. From the locations for all the nodes in the circuit, resistances between nodes and ground and resistances for branches between nodes are calculated for the given time instant.
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 19 of 61 The main parameters that define the energy storage device model are: • Energy storage capacity (kWh) • Power rating (kW)
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 20 of 61 5.7 Light rail 5.7.1 System parameters The main operating parameters of the light rail transit (LRT) system being simulated shown in Table 5–1 and repeated here are as follows: • 7 Miles of track (double track system)
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 21 of 61 Simulated Train Voltages (Case 64 - A4 Outage, 5-Minute Headway) 100 200 300 400 500 600 700 800 900 1,000 24.5 25.0 25.5 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0 30.5 31.0 31.5 32.0 Location (miles)
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 22 of 61 5.7.3 ESD option Returning to the example above, if an appropriately sized ESD is installed in location A4X, the resulting train voltage improvements can be shown in Figures 5–5 and 5–6, given that rectifiers at positions A4 or A5 TPSS are removed. From simulation results, the above figures indicate that the new ESD installation in A4X location will be adequate for train voltage support with either A4 or A5 TPSS rectifier removed.
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 23 of 61 Simulated Train Voltages (Case 75b-ESD760V - A5 Outage, 5-Minute Headway) 100 200 300 400 500 600 700 800 900 1,000 24.5 25.0 25.5 26.0 26.5 27.0 27.5 28.0 28.5 29.0 29.5 30.0 30.5 31.0 31.5 32.0 Location (miles)
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 24 of 61 Table 5-3 Energy and power rating summary in voltage support mode Case # Scenario ESD Mode ESD Energy (kWh) ESD Power (kW)
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 25 of 61 Simulated Train Voltages 0 100 200 300 400 500 600 700 800 900 1,000 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 11.5 12.0 12.5 Location (miles)
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 26 of 61 5.9 Commuter rail 5.9.1 System parameters A similar simulation analysis, again looking at the conditions of low voltage, is performed for part of a commuter rail system using the simulation parameters shown in Table 51and repeated here. • 5 Miles of track in a large commuter rail network; • 685V DC traction power system • 3 Traction substations • 1 Circuit breaker houses (CBH)
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Guiding the Selection & Application of Wayside Energy Storage Technologies for Rail Transit and Electric Utilities Transit Cooperative Research Program Transportation Research Board Page 27 of 61 Train Voltages - MP32 to MP37 7-8 AM Peak Hours Su b35 (N ew ) S ub -3 4 S ub -3 6 S ub -3 2 0 100 200 300 400 500 600 700 800 32 33 34 35 36 37 Location (milepost)
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