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Transitioning to All-Renewable Energy: A No-Diesel Paradigm in Isolated Grid Systems

Explore the groundbreaking transition to an all-renewable energy model, eliminating diesel in isolated grids, as discussed by Brett Pingree of America’s Northern Power Systems. This initiative, successful at a Bahamian resort, features advanced technologies like static power inverters, solar arrays, and extensive battery storage. The project addresses unique challenges such as grid instability, harsh weather, and environmental impacts, while emphasizing safety and sustainability. Learn about the innovative solutions that pave the way for future renewable energy destinations without relying on fossil fuels.

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Transitioning to All-Renewable Energy: A No-Diesel Paradigm in Isolated Grid Systems

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  1. A New Isolated Grid Paradigm;All Renewables-----No DieselBrett Pingree, VP America’sNorthern Power SystemsMarch 9th, 2011

  2. Agenda • Why No Diesel? • Similarities to Isolated Arctic Grid Projects • Overview of Project • What Does the All RE Model Look Like? • Project Details • Challenges to Project

  3. Why No Diesel? • Hedge Against Rising Costs (and Procurement) of Diesel Acquisition • Limited Hazardous Waste Impact • Reduced Acoustic Impact • Save on Fuel Storage Costs • Significantly Increase Safety • Make a Green Statement (Marketing)

  4. Similarities to AK Isolated Grid Projects • Expensive Diesel!! • Difficult Access to Sites • Cranes, Heavy Equipment, and Skilled Labor • Weather (Hurricanes and Extreme Heat) • Weak Grid, Intermittent Power • Permitting and Fish/Wildlife (Iguanas and Parrots) • Soil challenges (Coral) • Salt Corrosion • Sharks instead of Bears

  5. All Renewable Bahamian Resort • 2 Parallel 300 kVA Static Power Invertors • 5 Proven’s 15kW • 2 Northern Power 100kw • 4 PV arrays of 308 Panels (65kW dc) each [260 Kw total] • 3 x 250kW Backup CAT Diesels • 2.16 MW-Hr Battery Storage System • 3 Battery Banks 360Vdc (180 cells (2000AHr) each) • Associated DC and AC switching • On-line June 2011 Expects to be the First 100% All Renewable Energy Destination Resort

  6. Additional Project Details • Wide Connected Load Range: ~75kW (min.) – ~300kw (Peak) expected • Daily Average Loads: 1,800 – 3,000 kw-Hr/day • Inverter-Based PV/Wind Grid • Inverters provide system frequency & voltage reference • Very fast response to load change • Efficient energy conversion thru wide load range • Bi-directional Inverter/Charger to manage battery bank SOC • Higher degree of WTG penetration than traditional WD/diesel grid

  7. Challenges to Project • Grid Impedance May Be Higher Than Typical Diesel Grid • Final System Optimization May Require Turbine Control Adjustments • Dispatch Coordination Between Inverters & WTG Critical to Performance Stability • 120 Ton Installation Crane delivery and Concrete dispatch • Unique advanced system configuration • Island time, expect the unexpected • Battery Life and Cost to Maintain • Hurricanes

  8. Promote Creative Solutions to Get Us Off Fossil Fuels! • Higher Degree of Penetration (diesel offset) Possible • Common DC Bus Supports Separate Inverter Sources for Redundancy • Split Power System- Balancing Different Feeds from Same Source   • Verified Inverter-Based System • Inverter Will Control Frequency & Voltage   • W-D Control Integration Similar to Diesel Integration • No Fossil Fuels!

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