Siemens ROBICON Perfect Harmony
Electric utility improves fuel efficiency with VFDs Intro A global electric utility with more than 20 U.S. power plants needed to increase efficiency and throughput in order to improve profitability. The utility was using fuel-inefficient, high-emission mechanical flow control methods to control the process flow of electric motor-driven fans, pumps and compressors. The constant-speed process motors created excessive inrush current during starting, thus limiting the number of starts over a period of time and making it difficult to accurately control process speeds. Challenge Depending on each plant’s specific regulations, the utility wanted to decrease auxiliary power requirements in order to achieve one of two outcomes. Outcome one: The plant would burn the same amount of fuel and create the same level of emissions, but increase its net MW output by the value of the reduced auxiliary. Outcome two: The plant would burn less fuel and generate fewer emissions, since
less auxiliary power is needed, and produce the same net MW output. Lifecycle cost was a significant factor, as the utility measured the ROI of all new purchases over a 20-year period. Plus, the utility wanted to reuse the original medium-voltage constant-speed motors, as purchasing new motors would negatively affect the project ROI. Solution The local Siemens representative worked closely with the utility to gather real-world process operating parameters and perform calculations to compare the power consumption of the existing constant speed motors with that of a medium voltage variable frequency drive (MV VFD) across the 20 power plants. The Siemens ROBICON Perfect Harmony VFD proved to offer significant energy savings, along with substantial ROI and low total cost of ownership, due to its 20-year life expectancy. The utility selected the Siemens ROBICON Perfect Harmony drive for these reasons, as well as for its built-in reliability.
usa.siemens.com/perfectharmony
ÿPOWER DIODEÿLDZ10503009ÿPWR MODULE DIODE(+/-)ÿÿ ÿPOWER DIODEÿLDZ10503008ÿPWR MODULE DIODE(+/-)ÿÿ ÿPOWER DIODEÿA5E38625958ÿDUAL RECT. MODULEÿÿ CAP SHARE RESISTORÿCAP SHARE RESISTORÿLDZ10503251ÿRESISTORÿÿ ÿCAP SHARE RESISTORÿLDZ10503252ÿRESISTORÿÿ SUPPERSSOR CAPÿCAP MTLZD POLYPROPÿLDZ10503201ÿCAP MTLZD POLYPROPÿÿ ÿCAP MTLZD POLYPROPÿLDZ10503202ÿCAP MTLZD POLYPROPÿÿ HEAT SINKÿHEAT SINKÿLDZ10502901ÿHEATSINKÿÿ ÿHEAT SINKÿLDZ10502902ÿHEATSINKÿÿ WIRE KITÿWIRE HARNESSÿLDZ14501000.KTWHÿWIRE HARNESSÿÿ ÿWIRE HARNESSÿLDZ14501002.KTWHÿWIRE HARNESSÿÿ PTCÿPTCÿA1A094595ÿPTCÿÿ Power Cell*ÿ315 A CellÿLDZ31500082.315ÿG3E CELL,315A, 690Vÿ6SR3902-0AG00-0AM0ÿ ÿ375 A CellÿLDZ31500082.375ÿG3E CELL,375A, 690Vÿ6SR3902-0AH00-0AM0ÿ ÿ500 A CellÿLDZ31500082.500ÿG3E CELL,500A, 690Vÿ6SR3902-0AJ00-0AM0ÿ31000082.5 ÿ660 A CellÿLDZ31500082.660ÿG3E CELL,660A, 690Vÿ6SR3902-0AK00-0AM0ÿ31000082.66 ÿ720 A CellÿA5E02772515ÿG3E CELL,720A, 630Vÿ6SR3902-0AL00-0AM0ÿ Power Cell* U55ÿ315 A CellÿA5E31299635ÿG3E CELL,315A, 690V, Hÿ6SR3902-0AG01-0AM0ÿ ÿ375 A CellÿA5E31299652ÿG3E CELL,375A, 690V, Hÿ6SR3902-0AH01-0AM0ÿ ÿ500 A CellÿA5E31299891ÿG3E CELL,500A, 690V, Hÿ6SR3902-0AJ01-0AM0ÿ ÿ660 A CellÿA5E31300233ÿG3E CELL,660A, 690V, Hÿ6SR3902-0AK01-0AM0ÿ ÿ720 A CellÿA5E31299628ÿG3E CELL,720A, 630V, Hÿ6SR3902-0AL01-0AM0ÿ Cell Input FusesÿCell FUSEÿLDZ10506512ÿG3E CELL FUSEÿ6SR3960-0JA00-0AD0ÿ ÿCell FUSEÿLDZ10506511ÿG3E CELL FUSEÿ6SR3960-0JA01-0AD0ÿ ÿCell FUSEÿLDZ10506515ÿG3E CELL FUSEÿ6SR3900-0JM47-0AM0ÿ ÿCell FUSEÿLDZ10506516ÿG3E CELL FUSEÿ6SR3960-0JA03-0AD0ÿLDZ095786C ÿCell FUSEÿA5E01654646ÿG3E CELL FUSEÿ6SR3900-0JM02-0AD0ÿ Cell Control BoardÿACCBÿA5E34621797054ÿPCA 630/690/750V ACCBÿ6SR0960-0AM74-0AD0ÿ ÿCCBÿA1A10000432.54MÿPCA 630/690/750V CELL CONTROLÿ6SR0960-0AM26-0AD0ÿ LDZ10000432.54C ÿCCBÿA5E03545933ÿPCA 630/690/750V CELL CONTROL 4000Mÿ6SR0960-0AM52-0AD0ÿ ÿACCBÿA5E34621797053ÿPCA 630/690/750V ACCBÿ6SR0960-0AM73-0AD0ÿ ÿCCBÿA1A10000432.53MÿPCA 630/690/750V CELL CONTROLÿ6SR0960-0AM45-0AD0ÿ LDZ10000432.53C ÿCCBÿA5E03545931ÿPCA 630/690/750V CELL CONTROL 4000Mÿ6SR0960-0AM51-0AD0ÿ ÿCCBÿA1A10000432.73MÿPCA 630/690/750V CELL CONTROLÿ6SR0960-0AM46-0AD0ÿ ÿCCBÿA5E03545937ÿPCA 630/690/750V CELL CONTROL 4000Mÿ6SR0960-0AM56-0AD0ÿ
https://robiconperfectharmony.com/ Email to info@robiconperfectharmony.com
The unique mechanical Advanced Cell Bypass feature allows the drive to remain operational in the unlikely event of a device power failure. Other MV VFD technologies shut down under these circumstances, which could cause the entire power plant to shut down. Due to the opportunity costs associated with a power plant not producing power, other MV VFD technologies have an extremely long ROI, which the utility would not approve. Results The Siemens ROBICON Perfect Harmony improved fuel efficiency across all 20 plants. Some facilities increased net MW output, and others burned less fuel — improving profitability. And because all 20 plants used the same drive, the utility benefited from spare parts availability and service alignment across locations. Benefits • Improved reliability and performance: Advanced Cell Bypass allows the drive to bypass any one cell during operation while maintaining the full output voltage.
About The Siemens ROBICON Perfect Harmony drive features a series of linked low-voltage cells that build the mediumvoltage power output of the drive system. With this topology, the drive can be scaled precisely for a very wide range of voltage and output power. Its ability to bypass any one cell during operation while maintaining the full output voltage offers unsurpassed availability and reliability. An integral transformer with phase-shifted secondaries eliminates the need for input harmonic filters or power factor compensation. This results in output voltage so close to perfect sine-wave shape that motors of literally any type — old or new, low-speed or high-speed — can be operated without any additional stress. And the drive’s industry-leading reliability is further backed by live, U.S.-based support. Siemens engineers are available to assist with everything from quoting and factory acceptance testing through training, commissioning and long-term technical support. With 10,000 installations, the Siemens ROBICON Perfect Harmony is the best-selling drive worldwide.
• Broad compatibility: IGBT-based topology allows the drive to be scaled precisely for a very wide range of voltage and output power. • Increased energy efficiency: Synchronous transfer reduces stress on the power grid and equipment during simultaneous motor startup. • Reduced total cost of ownership: 50+ technologies decrease downtime, improve energy efficiency and limit wear and tear — extending the drive’s life to up to 20 years. • Fast, dependable customer service: Real medium voltage drive technicians provide support throughout the lifecycle, from quoting, commissioning and on-site training to 24 / 7 / 365 call center support and nationwide field service.
Siemens Industry, LDAP 500 Hunt Valley Road New Kensington, PA 15068 info.us@siemens.com 1-800-241-4453 Subject to changes without prior notice All Rights Reserved Order No: LAFL-01800-0913 Printed in USA ©2013 Siemens Industry, Inc.