Abstract
The author [1] must be congratulated for the presented method for the closed-form solution of the problem of the determination of harmonic interactions in voltage source converters (VSCs) with emphasis on dc voltage ripple determination. The dc supply is assumed to be an ideal voltage source in Section II and then it is replaced by a capacitor in Section III to derive the equations for the complete harmonic analysis. Taking into consideration that there are several applications where the VSC is supplied by an ac/dc converter connected to the power grid (as for all industrial drives using an induction motor) or to a dedicated power source (such as for STATic COMpensator (STATCOM) solutions with battery or superconductive storage system), it would be of interest to observe the analysis of the dc link voltage harmonics and of the interaction of these harmonics with those produced by the supplying rectifier. Another point which could deserve more attention is the analysis of modulation strategies other than pulse-width modulation (PWM), such as those considered in [2]. A comment from the author is appreciated also on the approach to the analysis of random modulations (like those reported in [3]–[5] and considered in [2]), which are very attractive to reduce harmonic pollution on the inverter load by spreading the energy content of commutation disturbance on a wider frequency range. REFERENCES
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