Energy Saving Technologies for Railway Traction Motors

Matsuoka, Koichi; Kondo, Minoru

doi:10.1002/tee.20530

Cited by 20 publications

(12 citation statements)

References 11 publications

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“…As for the type of traction motors, DC machines have traditionally been the most widely used in urban rail. However, as a result of the outstanding advances experienced by power electronics in the last decades, AC (usually asynchronous induction) motors have been widely introduced, as they typically require less maintenance work, offer lighter weight per output torque and present higher efficiency [16].…”

Section: Description Of the Traction Systemmentioning

confidence: 99%

A systems approach to reduce urban rail energy consumption

González-Gil

Palacín

Batty

et al. 2014

Energy Conversion and Management

399

190

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There is increasing interest in the potential of urban rail to reduce the impact of metropolitan transportation due to its high capacity, reliability and absence of local emissions. However, in a context characterised by increasing capacity demands and rising energy costs, and where other transport modes are considerably improving their environmental performance, urban rail must minimise its energy use without affecting its service quality. Urban rail energy consumption is defined by a wide range of interdependent factors; therefore, a system wide perspective is required, rather than focusing on energy savings at subsystem level. This paper contributes to the current literature by proposing an holistic approach to reduce the overall energy consumption of urban rail. Firstly, a general description of this transport mode is given, which includes an assessment of its typical energy breakdown. Secondly, a comprehensive appraisal of the main practices, strategies and technologies currently available to minimise its energy use is provided. These comprise: regenerative braking, energy-efficient driving, traction losses reduction, comfort functions optimisation, energy metering, smart power management and renewable energy micro-generation. Finally, a clear, logical methodology is described to optimally define and implement energy saving schemes in urban rail systems. This includes general guidelines for a qualitative assessment and comparison of measures alongside a discussion on the principal interdependences between them. As a hypothetical example of application, the paper concludes that the energy consumption in existing urban rail systems could be reduced by approximately 25-35% through the implementation of energy-optimised timetables, energy-efficient driving strategies, improved control of comfort functions in vehicles and wayside energy storage devices.

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Section: Description Of the Traction Systemmentioning

confidence: 99%

A systems approach to reduce urban rail energy consumption

González-Gil

Palacín

Batty

et al. 2014

Energy Conversion and Management

399

190

View full text Add to dashboard Cite

show abstract

“…Annual energy and financial savings were associated with energy savings (for an estimated cost of 0.07 €/kWh) over the IM. Also, the materials cost increased for an expected amortization period and environmental impact of energy savings were calculated exclusively in terms of reduction of equivalent CO 2 emission (for a 0.6 kg CO 2 /kWh ratio) [30,31]. These results are summarized in Table 6.…”

Section: Performance Of Pmsm Compared With Respect To the Im Usedmentioning

confidence: 85%

Permanent Magnet Synchronous Motor with Different Rotor Structures for Traction Motor in High Speed Trains

2018

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Abstract:In this work we proposed to study the use of permanent magnet synchronous motors (PMSM) for railway traction in the high-speed trains (HST) of Renfe Operadora (the Spanish national railway operator). Currently, induction motors (IM) are used in AVE classes 102-112 trains, so, the IM used as a traction motor in these trains has been studied and characterized by comparing the results with data provided by Renfe. A PMSM of equivalent power to the IM has been dimensioned, and different electromagnetic structures of the PMSM rotor have been evaluated. The simulation by the finite element method and analysis of the equivalent electrical circuit used in all the motors have been studied to evaluate the performance of the motors in this application. Efficiency is calculated at different operating points due to its impact on the energy consumption of railway traction. The implementation of the PMSM evaluated is recommended, mainly due to the improvements achieved in efficiency as compared with the IM currently used.

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“…To calculate it, at every time step the proportional and integral control components are calculated as described in Equations (14)- (18). For the standard driving the control variable is computed using Equation (17), while for the eco-driving strategy Equation (18) is used instead.…”

Section: Driving Modelmentioning

confidence: 99%

Assessment of the Worthwhileness of Efficient Driving in Railway Systems with High-Receptivity Power Supplies

et al. 2020

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Eco-driving is one of the most important strategies for significantly reducing the energy consumption of railways with low investments. It consists of designing a way of driving a train to fulfil a target running time, consuming the minimum amount of energy. Most eco-driving energy savings come from the substitution of some braking periods with coasting periods. Nowadays, modern trains can use regenerative braking to recover the kinetic energy during deceleration phases. Therefore, if the receptivity of the railway system to regenerate energy is high, a question arises: is it worth designing eco-driving speed profiles? This paper assesses the energy benefits that eco-driving can provide in different scenarios to answer this question. Eco-driving is obtained by means of a multi-objective particle swarm optimization algorithm, combined with a detailed train simulator, to obtain realistic results. Eco-driving speed profiles are compared with a standard driving that performs the same running time. Real data from Spanish high-speed lines have been used to analyze the results in two case studies. Stretches fed by 1 × 25 kV and 2 × 25 kV AC power supply systems have been considered, as they present high receptivity to regenerate energy. Furthermore, the variations of the two most important factors that affect the regenerative energy usage have been studied: train motors efficiency ratio and catenary resistance. Results indicate that the greater the catenary resistance, the more advantageous eco-driving is. Similarly, the lower the motor efficiency, the greater the energy savings provided by efficient driving. Despite the differences observed in energy savings, the main conclusion is that eco-driving always provides significant energy savings, even in the case of the most receptive power supply network. Therefore, this paper has demonstrated that efforts in improving regenerated energy usage must not neglect the role of eco-driving in railway efficiency.

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Energy Saving Technologies for Railway Traction Motors

Cited by 20 publications

References 11 publications

A systems approach to reduce urban rail energy consumption

A systems approach to reduce urban rail energy consumption

Permanent Magnet Synchronous Motor with Different Rotor Structures for Traction Motor in High Speed Trains

Assessment of the Worthwhileness of Efficient Driving in Railway Systems with High-Receptivity Power Supplies

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