Overview
Station-Linked Regenerative Inverter for Efficient DC Urban Rail Power Use
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Regenerative braking in DC traction systems causes catenary over-voltage when energy cannot be consumed.
Conventional onboard resistors dissipate regenerative energy as heat, limiting energy-saving benefits and vehicle lightweighting.
Urban rail networks need a system that stabilizes DC catenary voltage while using regenerative energy efficiently at stations.
This technology links DC traction power with station facilities to convert regenerative DC power into usable AC loads.
A modular regenerative inverter maximizes use of regenerative energy and optimally controls catenary voltage in urban rail substations.
Core Competencies
Purpose
High-efficiency station-linked modular regenerative inverter system that stabilizes DC catenary voltage and maximizes utilization of regenerative braking energy in urban rail networks.
Automated Station-Linked Regenerative Inverter
Automated Station-Linked Regenerative Inverter
Converts DC regenerative power directly into AC power for station loads without additional feeder lines; enables local consumption of regenerative energy.
Modular DC–AC Conversion Architecture
Modular DC–AC Conversion Architecture
Modular inverter units can be added or operated in parallel, allowing stepwise capacity expansion and flexible configuration according to station conditions.
DC Catenary Voltage Stabilization
DC Catenary Voltage Stabilization
Controls inverter operation according to regenerative power and load status to maintain stable DC catenary voltage and prevent over-voltage.
Integrated Control and Protection
Integrated Control and Protection
Provides centralized operation control, monitoring, and protection functions to ensure reliable operation of regenerative inverters connected to the DC traction system.
Efficient Use of Regenerative Energy
Efficient Use of Regenerative Energy
Maximizes use of regenerative braking energy by linking traction power with station facilities, reducing wasteful dissipation in onboard resistors.
Expected Benefits
Energy Cost Savings
– Uses regenerative energy for station loads, reducing purchased electricity and overall traction power costs.Improved Regenerative Energy Utilization
– Replaces onboard resistors with station-linked inverters, significantly increasing the proportion of regenerative energy that is effectively used.Peak Load Reduction
– Shares power between traction systems and station facilities, reducing peak load on substations and improving power demand management.Reliable Power Supply for Stations
– Provides stable AC power to station equipment by converting regenerative DC power, supporting reliable operation of station facilities.
TRL 9
Commercialization stage reached.
Contact
Korea Railroad Research Institute (KRRI)
Global Business Department
Dr. Hosung Jung
E-mail: hsjung@krri.re.kr
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