Written responses - 9 John Amy- Navy A VSD with an efficiency of would assuage concerns about increased losses. ≥98% Just as important is the partial load efficiencies; is there an efficiency drop-off at light load conditions? Does the VSD reduce the overall system energy consumption? Rajib Datta GE – Really depends on application. Most applications are not efficiency sensitive. Secondary benefit of loss and thermal management may be more critical. Geoffrey Dolan Google – Industry on island grids could be early adopters cost of electricity –high Bill Geiwont-Vacon Agency & Utility regulations have always lead the need for improved control methods and overall system efficiencies. I look to these policy makers to indirectly push customers into replacing the old soft starters with VSDs to reduce energy consumption and in the case of grid connected generating systems that the AFE will need to play system stabilizer requiring higher bandwidth control systems. While a typical Si based VSD can quickly meet the energy savings goals I believe SiC will be needed, with its higher switching frequency for grid stability control . Krstic Slobodan Corporation –Eaton Efficiency of drive is not critical. Process efficiency benefits from drive and determines the need. Stephen Kuznetsov Raytheon – Efficiency not important as reliability/MTBF. Efficiencies of 96-97% are realistic goals Veli-Matti Leppanen ABB – Maybe there could be incentives via some sort of leasing arrangements-the savings could be split between equipment provider and end user. Tim McCoy McCoy Consulting – Efficiency benefits relative to what? Si-based or direct drive motor VSD’s applications? Brij N. Singh - John Deere Inc. As compared to Silicon inverter if WBG (read SiC) inverter offer additional 10% to 15% efficiency, it would be a significant incentive for customers of this new technology . Ajith Wijenayake DRS – Elimination of bulky magnetic MV transformer by a HF transformer is a definite benefit in terms of size and efficiency, but at a higher cost in the short term.
Written responses - 9 John Amy- Navy A VSD with an efficiency of ≥98% would assuage concerns about increased losses. Just as important is the partial load efficiencies; is there an efficiency drop-off at light load conditions? Does the VSD reduce the overall system energy consumption? Rajib Datta – GE Really depends on application. Most applications are not efficiency sensitive. Secondary benefit of loss and thermal management may be more critical. Geoffrey Dolan – Google Industry on island grids could be early adopters –high cost of electricity Bill Geiwont-Vacon Agency & Utility regulations have always lead the need for improved control methods and overall system efficiencies. I look to these policy makers to indirectly push customers into replacing the old soft starters with VSDs to reduce energy consumption and in the case of grid connected generating systems that the AFE will need to play system stabilizer requiring higher bandwidth control systems. While a typical Si based VSD can quickly meet the energy savings goals I believe SiC will be needed, with its higher switching frequency for grid stability control . Krstic Slobodan –Eaton Corporation Efficiency of drive is not critical. Process efficiency benefits from drive and determines the need. Stephen Kuznetsov – Raytheon Efficiency not important as reliability/MTBF. Efficiencies of 96-97% are realistic goals Veli-Matti Leppanen – ABB Maybe there could be incentives via some sort of leasing arrangements-the savings could be split between equipment provider and end user. Tim McCoy – McCoy Consulting Efficiency benefits relative to what? Si-based VSD’s or direct drive motor applications? Brij N. Singh - John Deere Inc. As compared to Silicon inverter if WBG (read SiC) inverter offer additional 10% to 15% efficiency, it would be a significant incentive for customers of this new technology . Ajith Wijenayake – DRS Elimination of bulky magnetic MV transformer by a HF transformer is a definite benefit in terms of size and efficiency, but at a higher cost in the short term.
Proceedings-of-HMW-VSD-Motor-Technology-Workshop-1.docx