Showing papers by "Mauricio B. R. Correa published in 2012"
25 Jun 2012
TL;DR: In this paper, the authors propose an adaptation in one of these techniques to allow a lower logic communication network between inverters and the central controller, without loss of performance and considering the photovoltaic panel's characteristics through a Matlab/Simulink model.
Abstract: The recent growing in small grid-tied photovoltaic systems for residential users, with public and private investments politics found in several countries, started a demand for a new generation high efficiency DC-AC inverters. These inverters should have good modularity, low size, weight and cost, with good energy quality at output and maximum power tracking of each solar panel. Multilevel inverters, in special the Cascaded H-Bridge, have advantages when there is present several panels acting as independent sources. Some works have discussed his integration with commercial grid, focusing control techniques that can operate even under partial shading conditions of solar panels. This work will propose an adaptation in one of these techniques to allow a lower logic communication network between inverters and the central controller, without loss of performance and considering the photovoltaic panel's characteristics through a Matlab/Simulink model.
8 citations
12 Nov 2012
TL;DR: In this article, the authors proposed a technique to reduce the low frequency DC-link energy oscillation due to the pulsating single-phase energy flow in a single phase to single phase Voltage Source Converter (VSC) and CSC which operate connected to the grid by incorporating two auxiliar active switches and one passive energy storage element to the rectifier and inverter side.
Abstract: This work proposes a technique to reduce the low frequency DC-link energy oscillation due to the pulsating single-phase energy flow in a single-phase to single-phase Voltage Source Converter (VSC) and Current Source Converter (CSC) which operate connected to the grid That pulsating energy is the major responsible for increasing the size of the passive components and power losses in the converter The pulsation reduction is achieved by incorporating two auxiliar active switches and one passive energy storage element to the rectifier and inverter side Additionally, this paper presents the comparison of these convertes regarding efficiency and power density Details control strategy is presented Simulation and experimental results are provided to validate the theoretical approach
2 citations
01 Nov 2012
TL;DR: In this article, a fast space-vector algorithm was proposed to avoid the failure of a component in a cascaded multilevel inverter by reducing the reference vector length and using redundant states to produce balanced line output voltages.
Abstract: Due to the large number of components in the cascaded multilevel inverters, the probability of failure in one of the inverter's component is high and proportional to the inverter's level. In this paper is presented a fast space-vector algorithm with the purpose to avoid this issue. The presented algorithm is based in the reduction of the reference vector length and in the use of redundant states to produce balanced line output voltages when the converter is operating under a faulty condition. When compared with a well-known strategy from the literature, the results show its effectiveness and better performance.
2 citations