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Design and Implementation of Dynamic Voltage Restorer for Voltage Sag Mitigation
Design and Implementation of Dynamic Voltage Restorer for Voltage Sag Mitigation

... The common causes of voltage sag are faults or short circuit in the system, starting of large loads and faulty wiring. This will lead to increase in both production and financial loss for industries. Therefore, it is vital to mitigate voltage sag. Two main characteristics that explain the voltage sa ...
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... limitation. Figure 1b shows an application where the input less than 2V will not be accurately handled by the op amp. 大器”则能很好的应对此类特殊的应用。尽管如此, signal is referencedopto amp” ground.would In thishandle case, input of A “single-supply this signals particular +VS = 15V 仍可采用许多不同的方式将标准的运算放大器用于单 less than 2 ...
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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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