wind turbine commissioning utilizing mini-grid power
TRANSCRIPT
© 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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© 2003 Aggreko
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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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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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
1.85 MVA Transformers
Load Bank
Transformer
• Open Breaker when cable test is complete
• Unload load bank
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© 2003 Aggreko
Energizing 4 Pad Mount Transformers
4000 amp Disconnect
Collector Circuit
1.85 MVA Transformers
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
1.85 MVA Transformers
Load Bank
Transformer
• Open Breaker when cable test is complete
• Unload load bank
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© 2003 Aggreko
Energizing 8 Pad Mount Transformers
4000 amp Disconnect
Collector Circuit
1.85 MVA Transformers
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
1.85 MVA Transformers
Load Bank
Transformer
• Open Breaker when cable test is complete
• Unload load bank
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© 2003 Aggreko
Energizing 12 Pad Mount Transformers
4000 amp Disconnect
Collector Circuit
1.85 MVA Transformers
Load Bank
Transformer
• Set load on load bank• 800 kW• 1657 KVAr
• Close breaker when transformers are closed
• 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