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Four-leg voltage-source converters provide an effective neutral connection in three-phase systems with neutral wire. They can be applied to inverters, rectifiers or active filters to control the neutral current caused by unbalanced or nonlinear loads as well as unbalanced sources. From the modulation point of view, the four-leg converters can be considered as four-phase systems. Hence, the modulation task can be carried out with a generic multiphase modulation algorithm. Recently, a novel space vector PWM technique for multilevel multiphase voltage-source converters has been presented. The four-dimensional space vector PWM algorithm for multilevel four-leg converters presented in this paper is the result of applying such technique to a fourphase converter. Finally, the algorithm is implemented in a lowcost FPGA and it is tested with a prototype by using a five-level cascaded full-bridge inverter.

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Shielding twisted pair with metallic tape is a widely used resource to reduce the electromagnetic emissions and increase noise immunity of the twisted pair to those emissions. But, in addition to decrease electromagnetic emissions, shield also affects electric and geometry characteristics of the pair. Estimation of twisted pair geometry is vital to compute as much as the shield affects the electric characteristics of the pair.The goal of this paper is to develop a model of shielded twisted pair which allows to compute the shield shape as a function of twisted properties of the pair and physical characteristics of the shield tape. The model calculated in this paper is a part of a large work research; with the results of that research we can calculate the most used electric characteristics of the pair according to the physical and geometrical characteristics of it. This research was applied in an important cable manufacturing company of the automotive sector.

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