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Two topologies of single phase cycloconverters based on Buck-Boost and Ĉuk topologies are presented. Instead of simple switching scheme of P and N controlled rectifier-converters, high frequency switching of uncontrolled rectifiers outputs have been used with the help of Buck-boost and Ĉuk converters. The input supply is an AC source followed by a full bridge rectifier circuit, the output of which...
Operating a dual three-level inverter system from a single dc link circuit is an economic solution for generating five-level output voltage waveforms and to double the output power compared to a single three-level inverter. Such an inverter system is used for feeding a drive motor with open stator windings. A mechanism is then required to reduce the common-mode voltage components of the motor voltages...
Active Front-End (AFE) converter operation produces electrically noisy DC bus on common mode basis. This results in higher ground current as compared to three phase diode bridge rectifier. Filter topologies for DC bus have to deal problems with switching frequency and harmonic currents. The proposed filter approach reduces common mode voltage and circulates third harmonic current within the system,...
This paper presents a study of determining the optimum operating parameters of a unipolar PWM inverter. Variations on the input voltage level and switching frequency will be investigated to see their impacts on the operation of the inverter and harmonics produced. Results through experimental approach show that careful selections of inverter parameters yield inverter's operation with highest efficiency...
This paper makes a full analysis on SCRs used in 3-phase PWM current source rectifier in the hundreds kilowatts power application, and proposes a novel driving method with reversed voltage on SCRs during turn off operation, drastically decreasing the TOFF of SCRs, and, therefore, achieving higher switching frequency. Taking the advantage of this novel idea, crucial electrical circuit characteristics,...
High power converters are built using high-voltage and high-current rated semiconductors. The commutation of these devices imply large amounts of energy per cycle leading to very low switching frequency in order to avoid a high rise on the semiconductors temperature. The consequence is high harmonic distortion generated by the converter. Grid codes requirements specify the maximum admitted harmonic...
This document describes a new approach to generate binary signals with varying pulse-lengths for the use in power electronics. The novel modulation scheme SB-ZePoC (Zero Position Coding with Separated Baseband) was primarily developed for Class-D audio amplifiers. This modulation scheme has the extraordinary advantage that the signal band is free of harmonic distortion and carrier intermodulation...
The authors contrast two topologies for direct AC-AC matrix converters: namely, a conventional three-phase matrix converter and a novel six-phase matrix converter. Comparison of the relative performances is made with regard to voltage and current harmonics, and impact of dead time in the firing pulses on harmonic distortion. A performance study of each topology feeding a passive load is carried out...
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