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Do Your Projects With Domain Experts…
Copyright © 2015 LeMeniz Infotech. All rights reserved
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LeMeniz Infotec...
Do Your Projects With Domain Experts…
Copyright © 2015 LeMeniz Infotech. All rights reserved
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LeMeniz Infotec...
Do Your Projects With Domain Experts…
Copyright © 2015 LeMeniz Infotech. All rights reserved
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LeMeniz Infotec...
Do Your Projects With Domain Experts…
Copyright © 2015 LeMeniz Infotech. All rights reserved
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LeMeniz Infotec...
Do Your Projects With Domain Experts…
Copyright © 2015 LeMeniz Infotech. All rights reserved
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LeMeniz Infotec...
Do Your Projects With Domain Experts…
Copyright © 2015 LeMeniz Infotech. All rights reserved
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General analysis and design guideline for a battery buffer system with dcdc converter and edlc for electric vehicles and its influence on efficiency

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General analysis and design guideline for a battery buffer system with dcdc converter and edlc for electric vehicles and its influence on efficiency


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General analysis and design guideline for a battery buffer system with dcdc converter and edlc for electric vehicles and its influence on efficiency

  1. 1. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 1 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com General Analysis and Design Guideline for a Battery Buffer System with DC/DC Converter and EDLC for Electric Vehicles and its Influence on Efficiency Abstract Introduction: In an electric driven vehicle, the battery has a major influence on the costs and the volume. Thus, a high lifetime of the battery, connected with a high operation range of the vehicle and low volume is required. In a common electric propulsion system, the battery is connected to a voltage source inverter via a dc/ac converter, which feeds an electric machine that is mostly an induction machine (IM) or a permanent magnet synchronous machine. The battery has to deliver or accept all the power which is demanded or recuperated by the propulsion system at all operating points. Loaded with high currents, the battery temperature rises and, thus, the reaction rate of the undesired chemical processes, such as corrosion, increases. Hence, a higher temperature causes a reduction of the battery lifetime. Further, during charging of the battery with high currents that occur during regenerative braking, the efficiency is not satisfying because a part of the recuperated energy is lost in the
  2. 2. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 2 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com chemical processes. Another problem of high charging currents is the reduction of active mass. Existing system: The energy system implemented in the EV, with the main source composed by the batteries already mentioned, and the auxiliary source implemented with the buck-boost converter and the ultracapacitor bank. The buck-boost converter allows the energy flow from the ultracapacitors to the batteries or to the traction motor in both directions. During regenerative braking, the ultracapacitors store energy, and during acceleration they provide energy to the vehicle. Nevertheless, the control system must predict some driving conditions to be able to minimize de energy consumption. Some variables needed for this process are the speed of the vehicle, the load current and the SOC of the ultracapacitors. Considering the batteries to be a passive element, the current across them is controlled by monitoring the load current and by managing the current across the Buck-Boost converter. The ultracapacitor charge is controlled by a second current control loop.
  3. 3. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 3 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Proposed system: In this paper, a general design guideline about the design of an optimized BBS including an n-phase inductor is presented. The benefits of the application of multiphase converters with nonideal coupled inductors (CIs) in interleaved operation are analyzed as well as a method to realize current sharing with a reduced sensor number in those converters. In contrast to former contributions, this paper gives universally valid guidelines for the whole BBS which can be applied to a system with arbitrary phase numbers and miscellaneous parts of the converter, or the BBS respectively, and not only for a particular case or a selected part of the converter. The duty cycle operation limits for a single sensor current-sharing method including the guideline to choose the suitable method is presented as well as the comparison of the current characteristics between coupled and discrete inductors (DIs) at the same resulting current ripple. The benefits of the additional buffer system in comparison to the operation without this system are verified at a test bench for an electric lift truck’s propulsion system.
  4. 4. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 4 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Applications:  Hybrid electric vehicles.  Fuel cell vehicles.  Pure electric vehicles. Block diagram:
  5. 5. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 5 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Gate driver circuit PIC controller circuit Battery Load BUFFER circuit 5VDC 12 V DC Inverter Battery storage Interleaved boost converter Control switch
  6. 6. Do Your Projects With Domain Experts… Copyright © 2015 LeMeniz Infotech. All rights reserved Page number 6 LeMeniz Infotech 36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue, Pondicherry-605 005. Call: 0413-4205444, +91 9566355386, 99625 88976. Web : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com Tools and software used:  MPLAB – microcontroller programming.  ORCAD – circuit layout.  MATLAB/Simulink – Simulation.

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