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The document presents a pre-project presentation on a battery charger for electric vehicles. It discusses the types of chargers, the configuration of an off-board charger including a three-phase AC-DC converter and bidirectional DC-DC converter. It also discusses the closed-loop control scheme for charging and discharging, simulation results showing charging and discharging, total harmonic distortion calculations, and plans for future work implementing constant current constant voltage control strategies.

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022 - mudasir Teli
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153 views13 pages

Project

The document presents a pre-project presentation on a battery charger for electric vehicles. It discusses the types of chargers, the configuration of an off-board charger including a three-phase AC-DC converter and bidirectional DC-DC converter. It also discusses the closed-loop control scheme for charging and discharging, simulation results showing charging and discharging, total harmonic distortion calculations, and plans for future work implementing constant current constant voltage control strategies.

Uploaded by

022 - mudasir Teli
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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PRE PROJECT PRESENTATION ON

BATTERY CHARGER FOR ELECTRIC VEHICLES

PRESENTED BY:-
AAMIR ALI DAR 2019BELE002
MUDASIR AHMAD 2019BELE022
TABEEN BAZAZ 2019BELE054

SUPERVISOR:-

DR FARHAD ILAHI BAKHSH

ASSISTANT PROFESSOR,
DEPARTMENT OF ELECTRICAL ENGINEERING
INDEX:

• Introduction
• Types of chargers
• Configuration of OFF Board Charger
• Closed loop configuration
• Control for charging and discharging
• Simulation results of charging and discharging
• THD calculation
• Results
• Conclusion
• Future Work
INTRODUCTION:

• Electric transport facilities have proved


to be a favourable approach to reduce
the stress on fossil fuels.

• The basic concept of V2G is that EV’s


provide power to the grid while they
are parked.
CONFIGURATION OF OFF BOARD CHARGER:

• A typical bidirectional charger has one bidirectional ac-dc


convertor and one bidirectional dc-dc converter.
• The three phase converters have a benefit of charging the
battery in a comparatively smaller time.
• Dc-dc convertor acts as buck during charging and boost
during discharging.
• The output of ac-dc converter is maintained at fixed value
using vector control.
CLOSED LOOP CONTROL:

• The control scheme provided for a three phase ac-dc converter is such that the voltage at
the dc capacitor remains at a desired value and also the system is operated at unity power
factor.
• In this technique, grid voltages and line currents of a three phase system are transformed
into an equivalent two phase system known as stationary reference frame.
• The active and reactive powers are controlled independently by the ‘d-axis’ and ‘q-axis’
currents respectively.
• The charging control used is constant current control.
CONTROL FOR CHARGING AND DISCHARGING:

• The charging strategy used is constant current control.


• In this the current is kept constant at a reference value. The voltage and SOC of the
battery increases.
• The reference current in our model is 30 A for discharging and -30 A for charging.
SIMULATION CIRCUIT:
SIMULATION RESULTS(CHARGING)
SIMULATION RESULTS (DISCHARGING)
THD DETERMINATION:

• As we increase the battery nominal


voltage THD increases.

BATTERY PARAMETERS
Nominal voltage=400V
Rated capacity=250Ah
Initial SOC=60%
CONCLUSION:

• At the end of our project , a three phase off board charger for electric vehicle which has a front end
ac-dc converter and a back end dc-dc converter connected via a dc link will be formed.
• The proposed charger is bidirectional in nature which means it is able to transfer power to the grid
using the stored energy of the battery thus paving way to vehicle to grid (V2G) technology which is
an important aspect seeing the increase in the penetration of electric vehicles nowadays.
• The control algorithm for ac-dc converter was able to maintain the dc link voltage at the desired
value with unity power factor at the input side. This control strategy allowed the independent control
of active and reactive powers thus leading to a better performance of the proposed system.
FUTURE WORK:

• We will use constant current constant voltage for charging and discharging.
• Upto 60% SOC we will use constant current and above 60% we will use constant voltage
strategy.

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