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Mateo Alejandro Corts

Universidad Nacional de Colombia

EVs( electric vehicles)

and its mpact on the

power system

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Outline

The ElectricVehicle (EV)

Impact onpower system

Possiblesolutions

Summary

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EVs (Electric Vehicles)

Rationale

Efficiency

Types of EVs

Batteries

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Rationale: Why Evs?

Green wave

Eco-friendly and efficient

technology

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Rationale: Why Evs?

Source: Tesla Motors.

(http://www.teslamotors.com/goelectric/efficiency)

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EVsclassification

EV types:

http://www.hydroquebec.com/

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Source: Technology Roadmap, Electric and plug-in hybridelectric vehicles. International Energy Agency

Energ

yand

pow

erofd

ifferent

batterytypes

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Source: International Energy Agency (IEA)

EVspenetratio

nforecas

t

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Impact on Power System

(distribution)

Pilot projects

Studies and simulations

7/31/2019 EVs Sistema de Potencia

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Problems and negative impacts?

Increasing energy demand (possibleneed ofmore substations)

THD harmonic distortion- (shorterdistribution transformers lifecycle)

Distribution transformers overload

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They depend on

Chargers design

Amount of electric vehicles

in use

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Distribution transformer loading at different penetrationlevels of PEVs

K.J. Yunus, M. Reza, H. Parra, K. Srivastava, Impacts of Stochastic

Residential Plug-In Electric Vehicle Charging on Distribution Grid,

ISGT 2012, Washington, USA.

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Solutions and workarorunds

Improving design

Control of charging cycles

Smart Grids

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Technology and manufacturing

changes in chargers have madepossible a reduction in THD, from

50 % to 6 % average THD when

the charge begins and from 70%

to 28% at the end of charging.

EV Chargers improvements

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Smart grids adoption should

allow integration of

automated metering and

variable energy prices anddemand; achieving an

optimum EVs charging

scheme.

Smart grids

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Situational Awareness

Applied to power systemsand to the power grid

operation, can help in

obtaining more reliable

and accurate forecasts

regarding future demand,infrastructure and energy

capacity of the system.

Knowing what is

going on around

you !!

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Summary

EVs penetration in the near future

Situational awareness of the grid

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Important ideas

EVs use is not that spread forhaving evident effects on the

grid right now.

Several research done about it

shows distribution transformers

could become overloaded due

to exceeding of their power-

handling capacity.

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Important ideas

Improved EVs chargers havelowered THD.

Smart grids may allow control

of charging cycles, reducingpeak demand.

EVs future widespread use

should require additionalinfrastructure

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?

Any

Questions ??Suggestions?

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References

1. Mario Alberto Ros. Impact of Electric Vehicle in Distribution Systems. Smart

Grids on electric Mobility (SGeM). Universidad Nacional de Colombia, 2012.

2. Renato Cspedes. Electrical Energy Distribution and Smart Consumers. SmartGrids on electric Mobility (SGeM). Universidad Nacional de Colombia, 2012.

3. Pecan Street Project. http://www.pecanstreet.org/

4. Fabian M Uriarte, Robert Hebner. Simulation of Pecan Streets Smart Grid: A

forecast of the impact on Austin energy. Center for Electromechanics,

University of Texas, 2012. http://www.utexas.edu/research/cem/

5. J. Carlos Gmez, Medhat M. Morcos. Impact of EV Battery Chargers on the

Power Quality of Distribution Systems. IEEE Transactions On Power Delivery,

Vol. 18, No. 3, July 2003.

http://www.pecanstreet.org/http://www.utexas.edu/research/cem/http://www.utexas.edu/research/cem/http://www.utexas.edu/research/cem/http://www.utexas.edu/research/cem/http://www.pecanstreet.org/http://www.pecanstreet.org/http://www.pecanstreet.org/

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Thanks !