Wind Turbine Commissioning Utilizing Mini-Grid Power

© 2003 Aggreko

Wind Turbine Commissioning Utilizing Mini-Grid

Power

Scottish Renewables Onshore Wind Conference & Exhibition

Agenda

• Aggreko: 10 years in North America wind industry

• Wind Farm Mini-Grid Projects– Why do a mini-grid project?– What is the need?– What is the processing that we follow?

• Questions

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© 2003 Aggreko

Brief History

Aggreko has been in the US for over 25 years

Working in the wind industry for 10 years– Pre-commissioning– Blade remediation and repair– Mini-grid commissioning

Mini-Grid projects – Over 40 completed – 12 different developers– 14 US states– 3 Canadian provinces

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Mini-Grid projects | 43

© 2003 Aggreko

New York State

Back-feed Power – 5 MW

Why do a Mini-Grid project?Contractual Reasons• Interconnection Agreement (ICA)

– Between the developer and the local utility– Transportation and delivery– Contains an interconnection date

• Power Purchase Agreement (PPA)– Between the developer and the entity that is buying the power– Not necessarily the local utility– Contains a Commercial Operation Date (COD) that the developer must be prepared

to deliver power by or Liquidated Damages begin

• Issue ICA date is too close to COD date

• Late Energization of Project Substation– Construction is substantially completed– Utility power is not yet available or late completion date

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© 2003 Aggreko

Why do a Mini-Grid project?Financial Reasons• Commitments to the Investment Community

– Developers have made commitment to their investors of how many kW they will add to the marketplace

• Revenue and Faster Return on Investment• Avoid Liquidated Damages tied to COD • Production Tax Credits (PTC) • Investment Tax Credits (ITC)• Any Additional Tax Benefits

– State– Local

• Provisions of New Economic Stimulus Package

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© 2003 Aggreko

Required information to build solution

• Collector circuit cable specs

• Length of cable

• Voltage of collector circuit

• Size and quantity of pad mount transformers

• Commissioning Requirements – Supply auxiliary power to turbines for commissioning – Commissioning and load test of turbines– Other requirements

• Desired Equipment location– Base of Turbine – End collector circuit at a junction point– Within the collection substation

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Equipment involved in a Mini-Grid system

• Generator (s) – 1500 kW to 6000 kW to power the system• Resistive/Reactive Loadbank • Circuit Breaker - 2000 to 4000 amps• Transformer (s) - 480 to 34,500 volts, 1000 kW to 5000 kW• Cables• Trailers• Fuel tanks • Operator

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© 2003 Aggreko

3 Megawatt System | 48

© 2003 Aggreko

Ontario, Canada

Average Mini-Grid Power Requirements

• 400 kW per turbine for 4 hours of commissioning

• 4 turbines commissioned at a time

• Set up in substation • Operate 12 hours per day• Goal is 4-8 turbine per day

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GEN 2

GEN 1 Generator Controller

Generator Controller

Resistive Reactive Load

bank CB 1

CB 2

4000 amp Disconnect

3 Megawatt System

Power Analyzer

• Records Power Quality

• Troubleshooting tool

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Energizing Collector Circuit

4000 amp Disconnect

Collector Circuit

1.85 MVA Transformers

Load Bank

Transformer

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Unload Collector Circuit

4000 amp Disconnect

Collector Circuit


Load Bank

Transformer

• Open Breaker when cable test is complete

• Unload load bank

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Energizing 4 Pad Mount Transformers

4000 amp Disconnect

Collector Circuit


Load Bank

Transformer

• Set load on load bank• 800 kW• 1657 KVAr

• Close breaker when transformers are closed

• Run for required time

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© 2003 Aggreko

Unload Circuit

4000 amp Disconnect

Collector Circuit


Load Bank

Transformer



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© 2003 Aggreko


4000 amp Disconnect

Collector Circuit


Load Bank

Transformer



• Run for required time

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© 2003 Aggreko


4000 amp Disconnect

Collector Circuit


Load Bank

Transformer



• Customer can now start pre- Commissioning

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© 2003 Aggreko

Energizing 12 Pad Mount Transformers Load Bank setting

1200 kW

1657 KVAr

• Current Load• 800 kW• 1657 KVAr

• Commissioning team is ready to load the first turbine

• Add 400 kW to the load bank

• 1200 kW • 1657 KVAr

• Turbine will take 400 kW of load

Generator load 800 kW

Turbine Load 400 kW

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© 2003 Aggreko

Wind Turbine Load

Step

Load Bank KVAr

settingLoad Bank kW Setting

Total Aggreko

Generator Load kW

WTG Load kW

1 1657 1200 1200 0 Add desired starting load to load bank

2 1657 1200 800 400 1st WTG loaded

3 1657 1600 1200 400 Add load for 2nd WTG to load bank

4 1657 1600 800 800 2nd WTG loaded

5 1657 2000 1200 800 Add load for 3rd WTG to load bank

6 1657 2000 800 1200 3rd WTG loaded

7 1657 2400 1200 1200 Add load for 4th WTG to load bank

8 1657 2400 800 1600 4th WTG loaded

Wind Turbine Commissioning Utilizing Mini-Grid Power

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