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Because of the multiple power sources involved, fault protection is one of the most critical issues in micro-grids. If a micro-grid including a PV installation is connected to the grid by means of a front end converter, multiple possible cases of fault may occur. It is a typical feature of such configuration that, depending on fault resistance and location, fault currents from the AC grid may pass...
The growing diffusion of distributed energy sources is making higher and higher the attention for DC distribution networks, that present some advantages related to an easier integration of renewable energy sources, storage systems and electrical drives. The DC network has to be connected to the traditional AC network by means of a converter interface whose main scope is the regulation of the power...
This paper deals with the use of grid-connected photovoltaic (PV) power plants for supplying the ancillary service of reactive power compensation to the distribution grid. A control strategy has been developed for controlling both real and reactive power exchanged with the distribution network. The paper suggests how the real and reactive power references should be selected in order to maximize the...
The large number of high power conversion applications has brought to the development of complex power converter configurations. A wide class of such converters are based on Power Electronic Building Block (PEBB) constituted of two level modules. Modulation strategies can take advantage of the modularity of these power converter topologies proposing modular and general control strategies. The present...
The paper approaches the analysis of the performances of doubly-fed induction generators for grid-connected wind turbines by means of algebraic analytical relationships given by the mathematical model of the machine. These relationships are used to carry out a control strategy which aims to maximize the global efficiency of the generation system. Some considerations about the sizing of the rotor converter...
The paper deals with dc / dc converter suitable to be coupled with fuel cells sources. The spreading of fuel cells has impelled a deep study of dc / dc converter structures properly designed to solve problems connected with the use of fuel cells as primary energy source. A good solution is represented by DIC (dual input inductor converter). The paper focuses on this kind of converter proposing a modification...
The paper deals with the analysis of an active power filter with two legs for three-phase systems. Although the converter topology is not symmetric, a suitable control of the power switches allows the achievement of balanced currents. The control technique for the compensation of the harmonics and reactive power of the load is derived directly from the mathematical model of the converter. The reference...
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