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4 38 Cost of Power Electronics DER total capital costs Power electronics are part of key DER technologies, and represent a significant portion of the capital costs. 100% 80% DER Capital Cost $/kW Power Electronics % of DER cost Microturbine $900 - $1,800 35% - 45% Wind Turbine $1,000 - $4000 25% - 40% Fuel Cell $3,000 - $6,000 10% - 30% Photovoltaics $6,000 - $10,000 10% - 25% DER Type 60% 40% 20% 0 Microturbine Cost reductions in power electronics will reduce the overall cost of DER. Wind Turbine Power Electronics Fuel Cell PV Other Capital Costs Source: NREL 5 APEI Initiative Timeline APEI Initiative is anticipated to be a collaborative ~$20M, 6 years effort.

66 sec. 6 sec. 7 min. CBEMA Magnitude - Duration Scatter Plot (EPRI Data) 42 • Full power must be available in 4 milliseconds = 1/4 cycle for seamless power supply • Energy should last for 15 -30 sec to cover 95% of outages and allow backup generation to ramp up • Required development of a compact 250kW inverter (Omnion, S&C) • Testing at PG&E facility. 8 kV Infinite Bus Load 3-phase coupling transformer ƒ Trailer housed close to customer ƒ Nominal 30 / 60 MVA 2 second surge. 5 kV 69 kV PCC Grid 48MW Wind Farm ƒ ƒ ƒ ƒ ƒ 3-phase coupling transformer Condon, OR Wind Farm Weak grid Pronounced PQ issues 10 MVA Statcom BPA, DOE, TVA, EPRI Supercaps 49 ETO-Based Converter FY 2008 Science, Technology, and Environment Briefing Specific Areas for Investment and Management Attention – Plus ups • Electricity storage • Carbon capture & storage • Unconventional fossil • Bioenergy • Adaptive grid controls • Power electronics • Superconductivity • Solar energy utilization • Buildings systems • Complex systems assessment Power Electronics and Advanced Materials Near Term Options < 2010 • ETO deployment • Improved thermal management systems with novel materials Through 2015 • Silicon carbide switch • High temperature materials • Ionic fluids for electrolytes Through 2025 & beyond • Advanced wide band gap systems deployment • Nano-structured materials and devices • Diamond switch 50 SBIR Projects : • High Power Densit y (100 kW) Silicon Carbide (SiC) Three Phase Inverters, Arkansas Power Electronics (FY06) • Advanced Power Converter System Using High Temperature, High Power Density SiC Devices, Aegis Technology (FY06) • Wide Band Gap, High Voltage, High Frequency Switches (FY07) Energy Storage and Power Electronics Program Peer Review Nov.

SMA offers a Web box communication hub and system logger. This product logs every inverter on a system and stores the information in data files for customer use. This technology will be especially useful as renewable energy credit trading becomes more common, and it enables services such as performance analysis and system alarms. Another SMA differentiation is its use of AC coupling. In the United States, most off-grid and backup power systems are connected through battery storage. In AC coupling, SMA connects the system through an inverter that controls power quality to the load.

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Advanced power electronics interfaces for distributed energy workshop summary : August 24, 2006, Sacramento, California by Bernard G Treanton; National Renewable Energy Laboratory (U.S.); et al

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