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This paper presents PWM strategy of matrix converters. The PWM patterns for reducing the number of commutations to suppress the switching loss and output voltage harmonics have been proposed. The number of commutations during a control period in the control scheme can be reduced to three times from four or six times in the conventional control scheme. However, the several PWM patterns exist. The selection...
This paper presents theoretical analysis and experimental verification of the switching loss in the single-phase PWM control method. The single-phase PWM control method turns on or off only one of the three phase legs in each PWM-carrier period. Thus, the method makes it possible to reduce the average switching frequency by a factor of three and to reduce the switching power loss, compared with a...
PWM current source converters (CSCs) can directly replace traditional thyristor rectifiers in many industrial applications to improve power quality significantly. In this work, a design process for PWM current source rectifiers in the range of 1-10 MVA is developed. Different PWM techniques for CSCs are reviewed in the light of semiconductor losses and harmonic distortion of the modulated current...
A hybrid pulsewidth modulation (PWM) scheme that hybridizes the advantages of unipolar switching scheme (USS) and bipolar switching scheme (BSS) for grid-connected current source inverter (CSI) is presented. The former switching scheme has the advantage of low switching losses while the latter one has the advantage of generating output with low total harmonic distortion (THD). The inverter bridge...
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