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APS-7000 Series
APS-7000 Series

... the Simulate mode simulate power outage, voltage rise, and voltage fall; ten sets of the Sequence mode allow users to define parameters and produce sine wave by editing steps; Ramp Control allows users to set the variation speed for output voltage rise and fall; Surge/Dip Control simulates DUT's inp ...
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MODELLING GRID-CONNECTED VOLTAGE SOURCE INVERTER
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... observations detailed above suggest that an additional compensation controller could be used to introduce a phase lead at the crossover point, which would in principle allow an increased bandwidth. The advantage of such a controller would be its simplicity and ease of implementation. This concept wi ...
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... The device provides simple and performance electronics ballast control function for the half bridge L/C resonant inverter. This device is optimized for electronics ballast requiring a minimum board area, reduced component count and low power dissipation. Internal soft start circuitry eliminates the ...
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Technical Specification for Variable Frequency Drives
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... a microprocessor which generates a sine-coded output voltage, which results in lower harmonics and extremely quite motor operation. Phase shift transformers required to produce the phase shifted input to the multi-pulse rectifier shall be factory wired and mounted within the Variable Frequency Drive ...
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... Recent advancements in renewable energy have created a need for both high stepup and high efficiency dc-dc converters. These needs have typically been addressed with converters using high frequency transformers to achieve the desired gain. The transformer design, however, is challenging. This paper ...
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... up to 500 VL-N and 5 A secondary current. There are no special requirements for energy accuracy. A universal supply and two modules are built-in the meter. The first module is an relay output and the second one is a tariff input. Meter is without communication, calibration frequency is 50, 60 Hz IP ...
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... applications due to their relative low cost and high reliability. Conventionally, these machines are fed from a single-phase ac mains supply. To achieve variable speed operation a power electronics inverter can be used. Although in this case a configuration with a single phase input / three phase ou ...
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EE 410/510: Electromechanical Systems Chapter 5
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Starting and control of three-phase asynchronous motors
Starting and control of three-phase asynchronous motors

... from star to delta must be observed when connecting the conductors to the motor and starter. The operating direction of the motor must be considered and observed. Incorrect connection of the phases can cause very high peak currents at restart, because of the slight drop in speed during the de-energi ...
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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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