System Impacts Evaluation of a Single-Phase Traction Load on a 115-kV Transmission System

Sutherland, Peter E.; Waclawiak, M.; McGranaghan, Mark

doi:10.1109/tpwrd.2006.873126

Cited by 31 publications

(9 citation statements)

References 10 publications

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“…These variations can be represented by the ratio of compensation power to rated ones, as shown in (3). (4) A graph showing the variation of hs value with load power factor under different design rated PFLr is plotted in Fig. 5 according to (3).…”

Section: A Concept Of Compensation Range To Evaluate Compensation Camentioning

confidence: 99%

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Analysis in the Effect of Co-phase Traction Railway HPQC Coupled Impedance on Its Compensation Capability and Impedance-Mapping Design Technique Based on Required Compensation Capability for Reduction in Operation Voltage

Lao

Wong

Dai

et al. 2017

IEEE Trans. Power Electron.

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Railway hybrid power quality conditioner (HPQC) is one of the newly proposed devices for power quality compensation in co-phase high speed traction power supply for its benefit in reduction of operation voltage over conventional railway power quality conditioner (RPC). However, initial Railway HPQC design is developed based on minimum operation voltage at pre-defined fixed rated load. This may not be applicable in practical condition when load varies. In order to solve this problem, a Railway HPQC design with increased operation voltage has been investigated to enhance the compensation capability. Nevertheless, the compensation capability is even larger than that required during load variations such that the operation voltage is higher than it actually requires. A lower operation voltage can actually be used to provide required compensation capability when the coupled impedance is different from the designed rated one. In this paper, the effect of coupled impedance on the compensation capability in Co-phase Railway HPQC is being analyzed. An impedance-mapping design technique based on required compensation capability is then proposed based on the analysis. The proposed method is advantageous for lower operation voltage and smaller capacitance value. The effectiveness of impedance-mapping technique is verified via simulation and experimental results.Index Terms-Railway hybrid power quality conditioner, high-speed railway, power quality, co-phase traction power supply, impedance mapping Manuscript

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Section: A Concept Of Compensation Range To Evaluate Compensation Camentioning

confidence: 99%

“…Major traction power quality problems are mainly system unbalance, reactive power and harmonics [2][3] [4]. Concerning these power quality problems, IEEE has developed standards for their tolerances in different power systems [5].…”

Section: Introductionmentioning

confidence: 99%

Analysis in the Effect of Co-phase Traction Railway HPQC Coupled Impedance on Its Compensation Capability and Impedance-Mapping Design Technique Based on Required Compensation Capability for Reduction in Operation Voltage

Lao

Wong

Dai

et al. 2017

IEEE Trans. Power Electron.

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show abstract

“…The single-phase, nonlinear, and impact characteristics of traction load in electric railways degrade the power quality at the PCC, and affect the stable operation of the power system. [1][2][3][4][5] In addition, neutral sections are not only the main reason for the train speed restriction and traction loss, but they also reduce energy utilization. These are the inherent problems of electric railways for a long time.…”

Section: Introductionmentioning

confidence: 99%

A three‐phase symmetric converter in AC electric railway systems for power quality and energy efficient improvement

Linwei

Wang

2020

Int Trans Electr Energ Syst

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This paper proposes a three-phase symmetric converter that is connected between the power grid and the traction network. It can solve power quality problems such as negative sequence current, reactive power, and harmonics, thus reducing the interaction between the power supply and the user. Moreover, it supports the continuous co-phase power supply, which can remove all the neutral sections in electric railways, to improve energy utilization. Its control is simple and suitable for electric railways. We discuss the system configuration in detail, including the topology, the calculation of parameters, etc. In addition, the proposed scheme is compared with the traditional traction power supply system, railway power conditioner, and the co-phase power supply system based on active power compensator, as well as the modular multilevel converter-based scheme, respectively, to highlight its advantages. We design the control strategy, which consists of the input side and the output side. In the control part, we focus on the special problems for the application of this scheme in traction power supply systems, and propose the control strategy based on the characteristics of the traction load. Simulation is carried out and a 45 kVA low power platform is fabricated and tested to validate the effectiveness of the scheme. The results show that it has nice performance in solving the power quality problems of electric railways.

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“…Electrical railway systems are considered to be one of the main public transportation systems. These systems have power quality problems that can adversely affect other consumers and equipment at points of common coupling [1][2][3][4]. Among these problems, the significant amount of negative sequence current (NSC) that results from single-phase traction loads are worth mentioning.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive control strategy of railway power quality compensator for AC traction power supply systems

Kaleybar¹,

Farshad²

2016

Turk J Elec Eng & Comp Sci

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The development of electrical railway systems leads to critical power quality problems in the power grid. This paper discusses a kind of half-bridge-based railway power quality compensator system (HBRPQC) that can compensate negative sequence currents, harmonics, and reactive power simultaneously. In order to keep the HBRPQC performance efficient for the different kinds of transformers used in traction power supply substations, a new multifunctional control strategy that performs better than previous methods is proposed. Due to the fast dynamicity of traction loads, a recessive self-tuning PI controller based on fuzzy logic is adopted in the current control system. The output control variables are integrated with carrier-based pulse width modulation techniques to generate the pulse signals of HBRPQC switches. The performance of the proposed control strategy is verified for V/V, Yd11, and Scott transformers by simulation and the results prove the effectiveness of the strategy.

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System Impacts Evaluation of a Single-Phase Traction Load on a 115-kV Transmission System

Cited by 31 publications

References 10 publications

Analysis in the Effect of Co-phase Traction Railway HPQC Coupled Impedance on Its Compensation Capability and Impedance-Mapping Design Technique Based on Required Compensation Capability for Reduction in Operation Voltage

Analysis in the Effect of Co-phase Traction Railway HPQC Coupled Impedance on Its Compensation Capability and Impedance-Mapping Design Technique Based on Required Compensation Capability for Reduction in Operation Voltage

A three‐phase symmetric converter in AC electric railway systems for power quality and energy efficient improvement

A comprehensive control strategy of railway power quality compensator for AC traction power supply systems

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