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It is shown that internal low-frequency energy storage can be used to achieve harmonic-free operation and controllable power factors in converters whose desired operations require unequal instantaneous input and output powers, such as in single-phase rectifiers, inverters, cycloconverters, and reactive power generators. A systematic synthesis and analysis technique is developed for such converters...
This paper describes a three-phase active filter aimed at the compensation of reactive power and current harmonics of a symmetrical load. The filter employs an inductor for energy storage and a two-quadrant PWM bridge converter.
The active power filter is the harmonic filter which suppresses the ac harmonics by injecting PWM compensating current into the ac side. The novel model of PWM compensating current Is derived from the optimized injection method. By injecting the derived PWM current, the ac harmonics up to the order of the modulation number are eliminated. With no external source it is possible to build up the inductor...
An improved PWM inverter waveform synthesis technique for harmonic control in delta modulation (DM) process is presented. Filtering approach is incorporated in the DM technique to reduce harmonics of lower frequencies and suppress the unwanted subharmonics. Analytical method is described to determine the performance of multistage delta modulated inverter and the results are substantiated by experimental...
Two identical 3-phase, bipolar transistor, controlled-current, PWM power modulators are integrated so that one functions as a rectifier and the other as an inverter in an ac drive system. The rectifier input currents maintain near 60 Hz sinusoidal waveforms with unity power factor. Leading power factor option is available. The modulators do not depend on the availability of bidirectional switch elements...
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