The URL can be used to link to this page

Home My WebLink AboutTDX - Sand Point Excess Wind Utilization - SecondaryLoads MartinMiller_2013Sand Point Wind-‐Diesel Project Secondary Loads Performance & Lessons Learned February 15, 2013 Seward, AK Presented by: Martin Miller, P.E. TDX Power Sand Point Community • PopulaFon 976 (2010 census) • 55oN LaFtude (Same as Ketchikan) • Industries: fishing, fish processing, wind turbine maintenance Sand Point Wind Project Sand Point GeneraFng • 480 Customers (Approx) • Average Load: 492kW (2012) • 4 Diesel Generator Sets (3516, 3512, 3456) • Trident self-‐generates all processing power Sand Point Wind Project Wind Project • Project Cost: $3.2M • AEA: $2.1M • TDX: $1.1M • Wholesale Cost of Power: $0.1624/kwh • Major Components • 2 Turbines: Vestas V-‐39, 500kW Each • Controls: Automated Switchgear • Low-‐load Diesel Genset • Secondary Loads: Load Bank & Electric Boiler 131 ft ~65 ft Sand Point Wind Project Wind-‐Diesel Controls WIND DIESEL CONTROL FUNCTIONS Device FuncNon Notes / LimitaNons Diesel Engine Governor Frequency Control No “Wind Only” mode Secondary Load – Load Bank Maintain Load on Diesels Slow ON, Fast OFF Master Controller Engine Start/Stop, SCADA, HMI Secondary Load -‐ Boiler Provide heat to Jacket water loop Sand Point Wind Project Wind Ramps Up Sand Point Wind Project Wind Ramps Down Sand Point Wind Project Block Diagram Sand Point Wind Project Secondary Load Diesel Genset Wind Turbine WIND DIESEL CONTROL BLOCK DIAGRAM Wind Speed Genset Power Town Load Wind Power Frequency How do I Maximize Wind ContribuFon? Sand Point Wind Project 1. Properly Tune Diesel, Wind, and Load Controls 2. Diesel Minimum: • 30% of Rated 3. Rely on Wind! Fuel Savings Sand Point Wind Project Tuning Sand Point Wind Project § Loadbank response out of synch § Diesel surge RESULTS v Less engine effort/surge v De-tuned Load Control due to instability at very high wind speeds v Governor response stable v Magnitude of Freq deviation not ideal § Reliability vs. Fuel Savings § Every Day vs. Worst Case Performance Sand Point Wind Project April 2012 Performance ENERGY • $68,000 – NET Savings to Ratepayers • ($Wind -‐ $Offset Diesel) • 42,000 Gallons – Diesel Offset • 550,000 KWH Sold – Excludes Excess • 675,000 KWH total wind generated Sand Point Wind Project April 2012 – Dec 2012 RELATIVE CONTRIBUTION • 17.5% wind fracFon • Excludes Excess • 32% peak monthly wind fracFon (May 2012) DIESELS • 2-‐4 Engine Starts / Day, total plant • 40%-‐60% mean load on each engine (monthly basis) Highlights Lessons • Reliability trumps other issues • Don’t underestimate Commissioning • No negative impacts seen on lightly loaded diesels Recommendations • Secondary Load Control should be as fast as possible. • Less Frequency Deviation • Better Fuel Economy Open Questions • Should turbines be de-rated? • Can we rely on more wind, more often? • What are there maintenance and fuel efficiency impacts to the engines? Sand Point Wind Project