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This paper describes a method for designing LCL filters to be used in distributed generation systems. It is especially suitable for converters with low switching frequency and/or converters with modulation schemes generating harmonics in the entire frequency range. This property distinguishes the method from the well-known design processes. As an example, a 5 MW medium-voltage NPC converter for wind...
This paper presents an improved PWM strategy for three-phase inverters, especially suited for use at low ratios of switching frequency to fundamental output frequency. The method of third-harmonic injection is used to ensure maximum utilisation of the DC bus voltage. Implementation issues for the new modulation strategy are discussed. A comparison with a conventional, regularly sampled PWM is presented,...
This paper reports on a novel modulation strategy for generation of band limited signals with binary switches, which was originally developed for audio power amplifiers, and on applying it to energy conversion. This modulation strategy has the extraordinary advantage that the signal band is free of harmonics or carrier intermodulation products. This so called ldquoZero-Position-Coding with Separated...
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