Co-Phased Traction Power System Based on Balanced Transformer and Hybrid Compensation

Zhou, Fulin; Li, Qunzhan; Qiu, Daqiang

doi:10.1109/appeec.2010.5448301

Cited by 12 publications

(9 citation statements)

References 1 publication

(1 reference statement)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As a result, the coupling impedance at this point is selected and is calculated based on the assumption V invα1_A =V invβ1_B. By subtracting (12) from (11), the coupling impedance value is deduced and given in (13 (13) Similar to other application of LC coupling branch in a parallel connected power filters, the LC branch of the HRPC is also designed to resonant at a certain harmonic frequency for suppressing the harmonics. It is assume the LC branch resonant at nth harmonic, (14) is deduced.…”

Section: A System Parameters Designmentioning

confidence: 99%

See 1 more Smart Citation

A hybrid railway power conditioner for traction power supply system

Dai

Lao

Wong

2013

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

View full text Add to dashboard Cite

Co-phase traction power supply system was proposed for supplying the long-distance electrified railway without neutral sections. However, a railway power compensator (RPC) needs to be installed in each substation together with the traction transformer for improving the power quality. The RPC is mainly constructed by a back-to-back converter, which can reduce the unbalance currents by active power transfer and compensate reactive current and harmonics at the same time. A hybrid railway power conditioner (HRPC) is proposed for the co-phase traction power supply system in this paper. The HRPC uses a LC coupling branch between the converter and the traction supply. It is able to operate at a lower converter rating for achieving the same performance compared with conventional RPC. As a result, the initial cost and operational losses are reduced. The design of the LC coupling impedance and the DC bus voltage of the HRPC is focused on in this paper based on the mathematical models. The control system is implemented. Simulation results are provided and comparison with RPC is also given. Experimental results are provided to show the validity of the HRPC.

show abstract

Section: A System Parameters Designmentioning

confidence: 99%

“…Co-phase traction power supply system is proposed [10]- [12], which can supply the traction loads without neutral sections, as shown in Fig.2. The number of NS is cut down by half in the co-phase power supply system.…”

Section: Introductionmentioning

confidence: 99%

A hybrid railway power conditioner for traction power supply system

Dai

Lao

Wong

2013

2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

View full text Add to dashboard Cite

show abstract

“…It is indicated by the previous work that the RPC needs to transfer almost half of the total active power and almost all the reactive power. In these works, the rating of the RPC is calculated based on the assumptions that (1) the three phase grid currents are always balanced, (2) PF at the grid is unity and (3) all the harmonics are compensated [9][10].…”

Section: Introductionmentioning

confidence: 99%

Reduced Rating Railway Power Conditioners in Co-phase Traction and Traditional traction system

Babu¹,

Sreejaya²

2015

2015 International Conference on Control Communication &Amp; Computing India (ICCC)

View full text Add to dashboard Cite

This paper aims at reducing the rating of the power conditioners used in Railways. Co-phase traction employs a Railway Power Conditioner (RPC) for active power balancing, reactive power compensation and Harmonic elimination. The relation between the RPC Rating and the magnitude of the compensating currents and the power angles of the line currents is deduced. Different cases are considered with different combinations of the phase angles, and the best possible case is selected using theoretical analysis and verified by simulation using PSCAD. Comparison is made between the compensated and uncompensated case. The effect of an additional capacitance on the dc-link voltage is also studied. This RPC system is employed in a Traditional traction system used in Indian Railways, with neutral sections and the resulting changes and THD levels of the grid side currents are observed. These results are compared with the Co-phase Traction with RPC and the change in THD levels is noted.

show abstract

“…Co-phase traction power supply was proposed [8][9][10], which provides continuous power to the locomotives, as illustrated in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Modelling and control of a railway power conditioner in co‐phase traction power system under partial compensation

Dai

Wong

Lao

et al. 2014

IET Power Electronics

View full text Add to dashboard Cite

Co-phase traction power supply system provides continuous power to traction loads without neutral sections. In order to reduce system unbalance, compensate reactive power and harmonics, a railway power conditioner (RPC) operates together with traction transformer in each substation. In the past study, the RPC is designed to achieve three-phase balance and unity power factor (PF) at the grid side. As a result, its rating is high. According to the power quality tariff plan in China, the penalty for reactive power can be avoided if the PF is higher than 0.9. In this study, a grid-side PF of 0.9 is achieved via different control approaches after analysis. Among these approaches, the rating of the RPC in the worst case is more than twice that in the best case. Hence, selection of a suitable control parameter is necessary. The minimum rating of the RPC is achieved by setting the power angle of phases A and B lagging and the power angle of phase C leading under partial compensation. The rating of the RPC is reduced to 70% by setting PF to 0.95 instead of 1. Simulation and experimental results are provided to show the validity of the modelling, design and control method.

show abstract

Co-Phased Traction Power System Based on Balanced Transformer and Hybrid Compensation

Cited by 12 publications

References 1 publication

A hybrid railway power conditioner for traction power supply system

A hybrid railway power conditioner for traction power supply system

Reduced Rating Railway Power Conditioners in Co-phase Traction and Traditional traction system

Modelling and control of a railway power conditioner in co‐phase traction power system under partial compensation

Contact Info

Product

Resources

About