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The best way to avoid MPPT drawbacks due to mismatching phenomena is to use a dedicated DC/DC converter, in charge of MPPT, for each PV panel instead of a big central converter for the whole PV array. Dedicated DC/DC converters can be boost-like converters; they must be serially connected each other to obtain an higher voltage as required by the grid inverter. However, when the number of PV panels...
The paper analyzes and compares main features and performance of two different kinds of active front ends employed in high power induction motor drives. The two considered topologies of Voltage Source Rectifiers (VSR) are: A) two-level four-wire; B) three-level three-wire in Neutral Point Clamped configuration. Reference is made to a Direct Torque Control strategy, which can produce critical unbalanced...
In this paper the use of an LLC resonant converter as Maximum Power Point Tracker (MPPT) in a photovoltaic application is presented. Two different implementations are considered: direct connection of the photovoltaic (PV) module to the grid and the string connection circuit. In Each solution the power converter efficiency is mainly limited by the step-up transformer. The impact of the transformer...
Worldwide, request of renewable energy and power rating of wind farm is strongly increasing in parallel. This, makes more difficult the design of the power electronics converter that interfaces the grid to the renewable energy resource. Synchronous Active Front-End (SAFE) is considered one of the most efficient topology that successfully manages the hard trade-off between high power size and power...
This document aims to describe a rigorous approach to correctly select the optimal turns ratio for a transformer involved in an isolated DC/DC boost full bridge converter realization, considering the input/output voltage ranges, the modulation scheme adopted and the efficiency constraints. The topological structure is first introduced, outlining the hardware components used. The step-down (or Buck)...
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