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In this paper, a novel filter structure is proposed based on the sequence of PWM voltage harmonics. At first, the phase of voltage harmonics is thoroughly analyzed. Based on the phase difference between three phases, it is shown that the sideband harmonics can be divided into positive-sequence, negative-sequence and zero-sequence components. Through 120° interleaving and three paralleled converters,...
Compared to conventional L filters, LCL filters and LLCL filters have better high-frequency harmonic attenuation ability with less total inductance. However, one or two more magnetic cores are commonly demanded for grid-side and paralleled trap inductors. To further reduce the weight and volume of filter inductors, magnetic integration technique is an effective way. For conventional integrated LCL...
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