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Bedeutende Energieeinsparungen und Reduktion der …在相当大的energieeinsparungen Reduktion得…
Date Significant energy savings and reduced emissions in power plants through variable speed drives Franz Frank (ABB Switzerland Ltd) – PowerGen Europe 2010 Agenda Savings potential by using variable speed drives Electrical aux. consumption in a coal fired power plant What is a Variable Speed Drive (VSD) System ? Main components of a VSD system Input transformer Main components of a VSD system Frequency converter Main components of a VSD system Medium voltage motor Agenda Thermal power plant Pump applications Thermal power plant Fan applications Power demand of centrifugal pumps Power demand Throttling control versus VSD control Energy Efficiency of Pump Control Methods Energy Efficiency of Fan Control Methods Agenda Case example Helsinki Energy, Finland Case example University of Illinois power plant, USA Case example Grosskraftwerke Mannheim, Germany Payback of applying electrical variable speed drives Case example Feedwater pump, average operating time / year = 8’000 h Average electrical power consumption = 4’000kW Resulting electrical energy demand = 32’000 MWh Energy savings due to applying VSD = 20% Resulting energy savings per year = 6’400 MWh Energy cost savings = 320’000 EUR based on el. energy costs of 5 ct / kWh resulting in a payback time of only two years total savings over 20 years lifetime = 5’760’000 EUR Additionally ! Reduction of CO2 emissions of ~5’000 t / year Lifetime costs of a VSD system Total investment costs 6 % of the total lifetime costs Customer benefit: Big savings on energy consumption, not on investment costs Agenda Product portfolio ABB Medium voltage drives ACS 1000, ACS 1000i ACS 1000 topology VSI with 3-level Inverter ACS 1000 topology Output sine filter Actively controlled LC low pass filter Eliminates virtually all inverter switching harmonics to the motor (THD 2%) Keeps motor and bearings common mode voltage free ACS 5000 ACS 5000 converter topology VSI with 5-level inverter Transformer 2 x 4-winding or 1 x
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