Comprehensive study on the power rating of a railway power conditioner using thyristor switched capacitor

Ghassemi, Alireza; Fazel, Seyed Saeed; Maghsoud, Iman; Farshad, Siamak

doi:10.1049/iet-est.2013.0046

Cited by 27 publications

(7 citation statements)

References 25 publications

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“…Because in the compensation system, the tasks of active and reactive are performed by different devices separately, the reference current of T and M phase converter * , * could be written as (23) according to Fig. 6(b) and equation (6).…”

Section: Control Algorithm Of the Scott-hpssmentioning

confidence: 99%

Hybrid Power Quality Compensation System for Electric Railway Supplied by the Hypotenuse of a Scott Transformer

et al. 2020

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To solve the three-phase unbalance and reactive power problems in the electric railway power supply system, this paper proposes a Scott transformer based hypotenuse hybrid traction power system (Scott-HHPS). Compared with other co-phase traction power supply systems, the Scott-HHPS could achieve the same compensation objective with smaller active compensation capacity. The paper analyzes the basic principle and makes a comparison between the Scott-HHPS and typical co-phase power supply system. The mathematical relationships among the load current, power factor and capacity demand in condition of power factor variation and regenerative braking are analyzed. In order to further reduce the compensation capacity of the Scott-HHPS, the partial compensation strategy in respect to the index of power factor and unbalance is proposed. Besides, an instantaneous current detection method based on the theorem of conservation of power is adopted to simplify the control algorithms. Simulations and experiments are both constructed and the results demonstrate that the Scott-HHPS can effectively improve the power quality in the electric railway power supply system.

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Section: Control Algorithm Of the Scott-hpssmentioning

confidence: 99%

Hybrid Power Quality Compensation System for Electric Railway Supplied by the Hypotenuse of a Scott Transformer

et al. 2020

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“…In this paper, a weighted multi-objective genetic-algorithm (GA) optimisation is applied to attain the optimum parameters of the PI-controller, the DC-link voltage level, and the DC-link capacitor. The objective function is shown in (12), in which the ripple is defined by (13) O.F. = rms(ripple)…”

Section: Designing the Auto-tuned Dc-link Parametersmentioning

confidence: 99%

“…APQC is expensive because of the big power switches. The most key parameter influencing the rating of APQC is the maximum unbalanced currents throughout the system [13], which occurs when one section is at full‐load and the other section has no load. The power switches of APQC must be designed for worst‐case condition, which is maximum unbalanced current, to meet the requirements of the system at any loading condition.…”

Section: Description Of the Railway System With Svc And Apqcmentioning

confidence: 99%

Hybrid railway power quality conditioner for high‐capacity traction substation with auto‐tuned DC‐link controller

Langerudy¹,

Gazafrudi²

2016

IET Electrical Systems in Transportation

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Power quality was always a major concern in designing an electric supply system for railways. Since electric railcars are usually single-phase loads, they draw high amounts of negative sequence component of currents, in addition to harmonic contents and transient currents. Therefore, many compensation methods were examined to improve the power quality indices. The active power quality conditioner (APQC) can be considered as an ideal compensator for high-speed railway, which contains a three-phase converter connected to the traction substation through a step-down transformer. However, with the growth of railway loads, the nominal rating of the solid-state high-frequency switches of APQC increases seriously, which in turn, results in an exponential growth of the cost of power-electronic switches. Therefore, for a very high-capacity railway system, it is not economic to apply an APQC. As a solution, a combination of APQC with the static VAr compensator is proposed in this study, which reduces the rating of APQC, and improves the power quality of the system. Simulation results validate the pre-defined hypothesis. Moreover, the performance of APQC depends on the DC-link operation, for which genetic-algorithm optimisation has been applied to obtain an optimum design of a stable DC-link voltage.

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“…The single-phase supply voltage that the traction force uses is acquired through an interconnected network which has 154 kV phase to phase voltage. Two transformers of 154 kV/25 kV are present in the substations and the transformers can operate as back-up [1][2][3][4][5][6]. The equivalent circuit model of the AC railway is presented in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Comparison of ANN and ANFIS Methods for the Voltage-Drop Prediction on an Electric Railway Line

Kocaarslan¹,

Akçay²,

Akgündoğdu³

et al. 2018

IU-JEEE

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Railway electrification systems are designed with regard to the operating data and design parameters. The minimum voltage rating required by traction during the operation should be provided. The maximum voltage drop on a line determines the minimum traction voltage. This voltage should be maintened within certain limits for the continuity of operation. In this study, the maximum voltage drop generated via traction was determined using artificial neural network (ANN) and adaptive neuro-fuzzy inference system (ANFIS) for a 25-kV AC-supplied railway. The voltage drop on line was calculated with regard to the operating data using ANN and ANFIS. ANN and ANFIS were explained, and the results were compared. The Levenberg-Marquardt (LM) algorithm was used for the ANN model. The LM algorithm is preferred because of the speed and stability it provides for the training of ANNs. The data created for one-way supply status were examined for simulation.

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Comprehensive study on the power rating of a railway power conditioner using thyristor switched capacitor

Cited by 27 publications

References 25 publications

Hybrid Power Quality Compensation System for Electric Railway Supplied by the Hypotenuse of a Scott Transformer

Hybrid Power Quality Compensation System for Electric Railway Supplied by the Hypotenuse of a Scott Transformer

Hybrid railway power quality conditioner for high‐capacity traction substation with auto‐tuned DC‐link controller

Comparison of ANN and ANFIS Methods for the Voltage-Drop Prediction on an Electric Railway Line

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