A Power Conversion System Combined with PV System and Energy StorageUnit for Metro DC Traction Grid
Photovoltaic(PV) technology applied in urban rail transit has become one of the research hotspots in recent years. At present, PV system is connected to AC 400 V power lighting system, and direct connection of PV system to DC traction grid can reduce electric energy loss in the process of transmissi...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Control and Information Technology
2021-01-01
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| Series: | Kongzhi Yu Xinxi Jishu |
| Subjects: | |
| Online Access: | http://ctet.csrzic.com/thesisDetails#10.13889/j.issn.2096-5427.2021.03.004 |
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| Summary: | Photovoltaic(PV) technology applied in urban rail transit has become one of the research hotspots in recent years. At present, PV system is connected to AC 400 V power lighting system, and direct connection of PV system to DC traction grid can reduce electric energy loss in the process of transmission and conversion. An energy conscious converter, combining a quasi-z source network based PV system and a high conversion ratio energy storage circuit, is proposed for the metro DC traction grid in this paper. The energy storage unit in the system can absorb excess photovoltaic power and recycle the regenerative braking energy of train. At the same time, this paper proposes a modulation strategy for energy storage converters, which can reduce the total voltage of energy storage components to a quarter or less of the DC traction grid voltage, effectively reducing the number of energy storage components connected in series, thereby reducing the probability of premature failure of the energy storage element group caused by overcharging or undercharging of a single unbalanced energy storage element unit. Simulation results verify the effectiveness of the PV system and its control strategy. |
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| ISSN: | 2096-5427 |