CSE Pure Power - Fall 2008 - (Page 10)

❯❯ PURE POWER // FALL 2008 10 in the news Utilities eye energy storage solutions A 20 MW ﬂywheel-battery system proposed for upstate New York is the latest effort to introduce large-scale energy storage into utility operations. Developers see the systems as peak-shaving resources and as a means for helping manage intermittent renewable resources. The proposed $50 million Stephentown, N.Y., project would incorporate an array of 200 ﬂywheel batteries over several acres. The batteries’ manufacturer, Beacon Power Corp., Tyngsboro, Mass., claims its equipment offers faster response than traditional peak-shaving generating plants, enabling rapid power-balancing capabilities for grid operators. The project is awaiting ﬁnal environmental approval from local authorities, and its application is pending with the New York Independent System Operator, which controls the state’s electrical grid. Utility giant AEP, Columbus, Ohio, is planning to install at least two 2 MW sodium-sulfur batteries in its transmission system by the end of this year, the ﬁrst step in a plan to boost its energy-storage capabilities to 25 MW by the end of 2010, and 1,000 MW by 2020. The company sees the technology as a necessary addition to successful integration of wind-energy resources, which are most plentiful during low-demand nighttime periods. Compressed-air energy storage (CAES) is seen as a possible resource for demand balancing and for evening out wind-farm generating capacity. The technology involves pumping air under pressure into underground storage facilities—including suitable natural geologic formations and retired salt mines—and releasing and heating it to drive a turbine generator. An Alabama CAES plant has operated since 1991, but interest has waned since that facility was commissioned. However, Iowa’s municipal utilities banded together to propose the Iowa Stored Energy Project, scheduled to go online in 2013 as a load-balancing strategy. A prototype CAES design for use in wind-farm development is scheduled for completion in 2012, with manufacturer General Compression, Newton, Mass., now seeking potential sites in windrich Texas, California, or the Rocky Mountain states. Nuisance VFD shut-down or breaker tripping is often misdiagnosed as “a quirky drive problem”. However, what is usually happening is caused by a voltage spike through the cable insulation. Since the cable is self-healing the drive will operate normally after re-start and thus the real problem is missed. Don’t be fooled by cable/voltage problems— It isn’t a “quirky” VFD Use 5% impedance, harmonic compensated reactors for the best single stage reduction of harmonic distortion. dV/dT Filters are designed to protect AC motors from the destructive effects of peak voltages facilitated by long cable runs–The MTE dV/dT filter is guaranteed to meet its maximum peak motor voltage specification (150% of bus voltage) with up to 1,000 feet of cable between the filter and the motor. Sine Wave Filters provide a sine-wave output voltage when driven from PWM inverters with switching frequencies from 2 kHz to 8 kHz. For drive applications, these filters eliminate the problem of motor insulation failures and reduce electromagnetic interference by eliminating the high dV/dT associated with inverter output waveforms. Call or visit our web site for more information and the name of your nearest distributor. The typical VFD cable between drive and motor is rated at 600 volts, but the high voltage spikes produced by the drive can well exceed 600 volts, notably near the motor termination. MTE’s Motor Protection Filters will eliminate the need for costly VFD cable. And, the MTE Sine Wave Filter solution is a more cost effective means to solve the cable problem while also providing motor protection–which the VFD cable cannot do! MTE motor protection filters include RL Reactors, dV/dT filters and Sine Wave filters providing you a cost effective and comprehensive line-up to solve virtually any motor protection problem. RL Reactors–Guard-AC reactors are compensated for harmonics (current and frequency), they are very effective at reducing the harmonics produced by a drive/inverter. .5 to 700 HP Motor, Drive and Cable Protection Find us fast at: For more info, enter #406 on the Reader Service Card www.purepowermagazine.com http://www.mtecorp.com http://www.mtecorp.com http://www.purepowermagazine.com

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CSE Pure Power - Fall 2008 In the News Commissioning CHP Enhancing Emergency Lighting Data Centers for Uncle Sam Handling a Nuisance Trip Sustainable Projects and Partnerships New Products Ad Index

CSE Pure Power - Fall 2008

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