Abstract
A high-power reversible converter can achieve a variety of functions, such as recovering regenerative braking energy, expanding traction power capacity, and improving an alternating current (AC) grid power factor. A new hybrid traction power supply scheme, which consists of a high-power reversible converter and two 12-pulse diode rectifiers, is proposed. A droop control method based on load current feed-forward is adopted to realize the load distribution between the reversible converter and the existing 12-pulse diode rectifiers. The direct current (DC) short-circuit characteristics of the reversible converter is studied, then the relationship between the peak fault current and the circuit parameters is obtained from theoretical calculations and validated by computer simulation. The first two sets of 2 MW reversible converters have been successfully applied in Beijing Metro Line 10, the proposed hybrid application scheme and coordinated control strategy are verified, and 11.15% of average energy-savings is reached.
Highlights
At present, diode rectifiers are still widely used in urban rail transit traction power supply systems to provide energy for the trains [1]
Since the energy can only be transmitted from alternating current (AC) to direct current (DC), the braking resistor must be employed to consume the surplus regenerative braking energy of the trains in order to avoid the abnormal rise of the DC voltage
This paper aims to introduce the high-power reversible converter into the traction power supply system of urban rail transit, and lay a foundation for further application
Summary
Diode rectifiers are still widely used in urban rail transit traction power supply systems to provide energy for the trains [1]. Since the energy can only be transmitted from alternating current (AC) to direct current (DC), the braking resistor must be employed to consume the surplus regenerative braking energy of the trains in order to avoid the abnormal rise of the DC voltage. This scheme will cause a very large waste of energy, increasing the tunnel temperature and the burden of the cooling system. In the field of urban rail transit, the maximum regenerative braking power is usually up to several megawatts, so thousands of EDLCs would be needed, which requires a large installation space and cost [11]. Flywheel systems for energy saving may be an important research direction in the future [13,14,15]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
