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This work analyzes some possible converter switching strategies so as to achieve higher efficiency and better current waveforms in a high power and low cost three-phase and three-level active AC-DC conversion.
Several techniques of control require a linear mathematical model in order to get an inverse dynamic solution. However, in more complex systems the linearization is not enough to solve the problem. A new class of systems called ??flatness systems?? that allows the entire description of the state's trajectories, and so to improve the dynamic response of those systems. This paper introduces a simulation...
The insertion of distributed generation systems has growth in the last years. The use of switching converters can produce voltage and current harmonics in the point of common coupling (PCC). In this context, this work presents the use of the passivity-based control in a single-phase inverter connected to the grid. The performance of this technique is compared with the conventional proportional integral...
The photovoltaic systems are extremely dependents on the climatic conditions in which they are submitted. For to represent this influence, there are in the literature three models of the solar photovoltaic panel: the equivalent circuit, the mathematical model and the multi-physical model. This paper compares these models using a grid connected photovoltaic system. Simulations of grid disturbances,...
The development of many technologies has provided a fast growth in the wind power. In this context, the variable speed wind turbines are preferred because more power is extracted from the wind. The synchronous machines has been gained attention because eliminates the gearbox, source of many mechanical problems. Moreover, the use of full converters improves the performance of the system because the...
This work presents an analysis of four topologies of Phase Locked Loop ?? PLL, applied in wind power inverters. The SRF-PLL, DDSRF-PLL, DSOGI-PLL and a MATLAB/Simulink PLL model are compared when there are harmonics in the point of common coupling (PCC). The simulations represent a wind farm with one synchronous generator of 1.5 MW using full converters. The results show that the harmonic produced...
Photovoltaic systems are highly dependent on climatic conditions in which they are submitted. The incident solar irradiance and temperature are the main factors impacting on the power generated by a solar panel. This paper presents three different models of a solar panel and compare, through simulations, their accuracies and efficiencies, and also shows the advantages and applications of each model...
The power generated by a solar photovoltaic panel is strongly dependent on climate conditions. For this reason, a grid-connected system needs a good response for variations in the solar irradiance and temperature. A non-linear control technique which has a good rejection of disturbances is the passivity-based control. This work presents the application of the passivity-based control in a maximum power...
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