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Standards Development
This document applies to coordination between Energy Feedback System (EFS) and other equipments in DC traction power system (TPS). EFS is a set of equipment which recovers regenerative energy from DC traction power supply system to AC power network.
This document applies to:
• EFS which is operated independently with energy feedback function in DC TPS.
• Those systems with energy feedback function in the DC TPS, such as bi-directional converter. When the system operated under energy feedback mode, it should be considered as EFS.
This document specifies the functions, connection modes, special performance requirements, location and sizing for EFS. This document gives guidelines for coordination requirements with other subsystems, energy-saving evaluation method, and analysis method based on simulation.
1. Purpose
The purpose of this documentis to give guidelines for:
- Coordination between EFS and associated systems, such as power systems, rectifiers, rail vehicles and trackside signalling systems.
-Evaluate the energy saving effect of EFS.
2.Technologies benefits
EFS can improve the utilization of regenerative energy, restrain the fluctuation of DC voltage, compensate the reactive power and harmonic.
3.Economical benefits
Energy feedback system can reduce the on-board resistor, the replacement of brake-shoes of rail vehicles, the energy consumption of rail transit, and then the overall operation cost of the system.
4.Enviromental benefits
First, EFS itself is pollution-free. Secondly, EFS improve the energy utilization of DC TPS, decrease energy consumption, and then reduce carbon dioxide emissions.
5.Social benefits
The success of EFS encourages more research, application and promotion of new energy-saving technologies and production.
6.Intended benefits
This standard intends to help rail transit operators using EFS properly, to reduce the energy consumption of rail transit system, and improve the competitiveness of rail transit system.
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