Aditya Pavan Kumar.T (08FE1A0202)

VIGNAN’S LARA INSTITUTE OF TECHNOLOGY AND SCIENCE

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CONTENTSAbstractObjectiveIntroductionPenetrationAC Based Hybrid SystemBenefitsTechnical DifficultiesConclusionReferences

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Abstract:

A wind-diesel hybrid system combines wind turbine(s)with diesel generator(s) to obtain a maximum contribution by the intermittent wind resource while providing continuous high quality electric power.

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Objective:

Reduce system fossil fuel consumption The more energy you use from your non-

renewable utility provider, the more these non-renewable resources are wasted and the more harm is done to the environment.

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Introduction: Wind power is expected to be economically

attractive, but wind power generation is variable and unpredictable. The hybrid wind power with diesel generation has been suggested (Hunter, 1994) and (Lipmann, 1989) to handle the problem above. A hybrid wind diesel system is very reliable because the diesel acts as a cushion to take care of variation in wind speed and would always maintain an average power equal to the set point.

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BLOCK DIAGRAM

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Penetration:Instantaneous Penetration: Instantaneous Penetration = Wind Power Output (kW)

–––––––––––––––––––––––– .

Primary Electrical Load (kW)

Average Penetration:  

Average Penetration Wind Energy Produced (kWh)

= ––––––––––––––––––––––––––– .

Primary Energy Demand (kWh)

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AC Based Hybrid System

•Low penetration systems -Wind acts as a negative load, very little control or

integration of wind turbines into the power system is needed.

•Medium penetration systems -Wind becomes a major part of the power

system but diesel engines still provide much of the system power control.

Additional components and limited supervisory control required to assist

diesels in maintaining power quality.

•High penetration systems -Completely integrated power system with

advanced control. Diesel generators shut off when not needed. Limited

operational control of system by plant staff.

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•Generally easy integration with existing diesel system, little or no diesel

modifications required.

•Diesel engines provide all frequency, voltage and reactive power control

requirements.

•Switch gear would need to be modified to add turbines and turbine

control software installed.

•Modest fuel savings of up to ~20% possible

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Medium Penetration System

•Diesel(s) are expected to operate at all times and provide main system

stability control.

•Will need devices to help control system frequency, eliminate excess energy

and provide VAR support.

•Secondary diesels may be shut off when not needed, reduces diesel operating

hours and fuel use.

•In high peak wind periods, primary diesel runs at low loading.

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High Penetration System

•Use of wind allows all diesel engines to shut down during mid to high wind

periods, reducing fuel consumption and operation hours

•Other hardware used to maintain system voltage, frequency, and reactive

power requirements

•System controller continually monitors power system and dispatched

equipment as needed to maintain system integrity

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• Reduced system operating costs.

• Reduced environmental impacts.

•Reduced fuel consumption .

•Can be the most economic option

where fuel is expensive and the renewable energy source is good.

• Increased Reliability

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Technical difficulties:

•High cost:

Power in rural areas is always expensive, but many elements drive up the

cost of wind in rural areas.

•New Technology:

Wind-diesel technologies are relatively new, implementation in rural areas

can be operationally challenging.

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Conclusions:

•Given good wind resource and adequate project density ,high penetration

wind-diesel systems can provide least life cycle cost of electricity in remote

communities.

•Isolated communities, mining sites and other industrial outposts need to

replace their expensive, polluting diesel generators with hybrid power systems

that use wind.

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References:Ackermann, T. (2005), Wind Power in Power Systems, John Wiley & Sons. Hunter

R.E.G. (1994), Wind-diesel systems a guide to technology and its implementation,

Cambridge University Press. Lipman NH. (1989), Wind-diesel and autonomous

energy systems, Elservier Science Publishers Ltd.

Bhatti T.S., Al-Ademi A.A.F. & Bansal N.K. (1997), Load frequency control of

isolated wind diesel hybrid power systems, International Journal of Energy Conversion

and Management, Vol. 39, pp. 829-837.

http://www.iser.uaa.alaska.edu/Publications/wind_diesel10022010.pdf

http://en.wikipedia.org/wiki/Wind_hybrid_power_systems

http://energy-alaska.wikidot.com/wind-diesel-applications

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