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Aalborg Universitet Yang, Yongheng; Ma, Ke; Wang, Huai; Blaabjerg, Frede
Aalborg Universitet Yang, Yongheng; Ma, Ke; Wang, Huai; Blaabjerg, Frede

... Hence, the reliability of the DC-link capacitors now plays an essential role in the system performance, leading to increasing efforts that are being devoted to reliability improvement and also optimization of the DC-link capacitors [3], [11]–[17]. It has been revealed that a reduction of DC-link cap ...
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Standpipe Presentation TSS
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... been exposed to unacceptable voltage performance on a number of occasions. – To remedy this issue, PacifiCorp is implementing several system improvements, including a new 65 MVA synchronous condenser at Standpipe substation, relocation of an existing 31.7 MVAr shunt reactor to Standpipe, installatio ...
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... clipping to prevent amplifier and load damage; over-current protection; DC voltage; channel active and temperature warning. Additional features include a lightweight switch-mode power supply, remote turnon, sequential turn-on and a switchable, built-in low-cut filter. ...
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... 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. Vishay Semiconductor GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. ...
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... Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all liability arising out of the application or use ...
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Variable-frequency drive



A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.VFDs are used in applications ranging from small appliances to the largest of mine mill drives and compressors. However, around 25% of the world's electrical energy is consumed by electric motors in industrial applications, which are especially conducive for energy savings using VFDs in centrifugal load service, and VFDs' global market penetration for all applications is still relatively small. That lack of penetration highlights significant energy efficiency improvement opportunities for retrofitted and new VFD installations.Over the last four decades, power electronics technology has reduced VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.VFDs are available in a number of different low- and medium-voltage AC-AC and DC-AC topologies.
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