Control Strategy of Hybrid Powered Railway Vehicles With EDLC

8/2/2019 Control Strategy of Hybrid Powered Railway Vehicles With EDLC

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A Basic Study on Control Strategy OfHybrid Powered Railway Vehicles Wwith

EDLC

SEMINAR PRESENTATION ON


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Content of the presentation

1) Introduction2) EDLC3) History4) Techonology advanteges5) TRACTION SYSTEM OF HYBRID RAIL VEHICLE

a) Energy storages devices

b) Main circuit configuration6) Verification by numerical simulationa) vehicle configuration for the simulations for the simulationb) simulation result

7) Conclusions


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Introduction

1. Diesel engine powered railway vehicle, such as diesel locomotives ordiesel motive units, are used in non-electrified railways all over the world.

2. The diesel engines have drawbacks of emission of CO2, NOx, SOx, noiseand vibration.In addition, it is more inefficient than electrical traction vehicles, because they

can principally not apply regenerative brake to reuse a part of the kineticenergy of running vehicles.

3. To cope with the problems with diesel engines, practical strategy to controlEDLC voltage has not been introduced for hybrid railway vehicle.

4. we first discuss the required capacity of EDLCs considering with the sizeand mass. Then,we propose a simple strategy to manage the capacitor energy by changing thediesel engines output power according to EDLC voltage.


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EDLC

Electric double-layer capacitors also known as supercapacitors, electrochemicaldouble layer capacitors (EDLCs),or ultracapacitors, areelectrochemical capacitors that have an unusually high energy density whencompared to common capacitors, typically on the order of thousands of timesgreater than a high capacity electrolytic capacitor.

For instance, a typical D-cell sized electrolytic capacitor will have a capacitancein the range of tens of millifarads. The same size electric double-layer capacitorwould have a capacitance of several farads, an improvement of about two orthree orders of magnitude in capacitance, but usually at a lower workingvoltage.
http://en.wikipedia.org/wiki/Electrical_double_layerhttp://en.wikipedia.org/wiki/Electrical_double_layerhttp://en.wikipedia.org/wiki/Capacitorhttp://en.wikipedia.org/wiki/Energy_densityhttp://en.wikipedia.org/wiki/Electrolytic_capacitorhttp://en.wikipedia.org/wiki/D_batteryhttp://en.wikipedia.org/wiki/Faradhttp://en.wikipedia.org/wiki/Orders_of_magnitudehttp://en.wikipedia.org/wiki/Orders_of_magnitudehttp://en.wikipedia.org/wiki/Faradhttp://en.wikipedia.org/wiki/D_batteryhttp://en.wikipedia.org/wiki/D_batteryhttp://en.wikipedia.org/wiki/D_batteryhttp://en.wikipedia.org/wiki/Electrolytic_capacitorhttp://en.wikipedia.org/wiki/Energy_densityhttp://en.wikipedia.org/wiki/Capacitorhttp://en.wikipedia.org/wiki/Electrical_double_layerhttp://en.wikipedia.org/wiki/Electrical_double_layer


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http://en.wikipedia.org/wiki/File:Supercapacitors_chart.svg


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History

The electric double-layer capacitor effect was first noticed in 1957 by General Electric eexperimenting with devices using porous carbon electrode.

It was believed that the energy was stored in the carbon pores and it exhibited "excepticapacitance", although the mechanism was unknown at that time.

General Electric did not immediately follow up on this work, and the modern version of t

eventually developed by researchers at Standard Oil of Ohio in 1966,after they accidethe effect while working on experimental fuel cell designs.


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Technology advantages

Due to the capacitor's high number of charge discharge cycles (millions or morecompared to 2001000 for most commercially available rechargeable batteries)

there are no disposable parts during the whole operating life of the device,which makes the device environmentally friendly.

Batteries wear out on the order of a few years, and their highly reactivechemical electrolytes present a serious disposal and safety hazard. This can beimproved by only charging under favorable conditions, at an ideal rate, and, for

some chemistries, as infrequently as possible.

Electric double-layer capacitors can help in this regard, acting as a chargeconditioner, storing energy from other sources for load balancing purposes andthen using any excess energy to charge the batteries only at opportune times.

Other advantages of electric double-layer capacitors compared withrechargeable batteries are extremely low internal resistance or ESR, highefficiency (up to 97-98%), high output power, extremely low heating levels, andimproved safety. According to ITS (Institute of Transportation Studies, Davis,CA) test results, the specific power of electric double-layer capacitors canexceed 6 kW/kg at 95% efficiency
http://en.wikipedia.org/wiki/Kghttp://en.wikipedia.org/wiki/Kg


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TRACTION SYSTEM OF HYBRID RAIL VEHICLE

A. Energy storage devicesEDLC is one of the candidates of energy storage devices same as Li-ionbatteries that is the key technology for hybrid railway vehicles.

EDLCs have advantages such as higher power density, longer life cycle and

easy measurements of the state of charge (SOC) by measuring the voltage.We rely on these benefits on EDLC for theapplication for diesel hybrid railway vehicle.


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B. Main circuit configuration

Fig. 1 shows a schematic diagram of hybrid traction system with EDLCs. EDLCs aim at peak

power assist, regenerativeenergy saving and equalize the output of diesel engine generator.


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III. ENERGY MANAGEMENT SYSTEM


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IV. VERIFICATION BY NUMERICAL SIMULATION


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B. Simulation Results


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V. CONCLUSIONSWe propose a novel and simple control method of the EDLCvoltage to manage onboardtraction energy for the diesel engine and EDLC hybrid powered railway vehicle.We have

revealed that the proposed method can manage the

capacitor accumulated energy and cut thepeak power of diesel engine on board through the numerical simulation. Theseresults willcontribute to design the actual EDLC and diesel engine hybrid system.


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Control Strategy of Hybrid Powered Railway Vehicles With EDLC