Showing papers by "Mauricio B. R. Correa published in 2011"
01 Nov 2011
TL;DR: In this article, a technique to reduce DC link oscillation in voltage source inverter (VSI) or current source inverter (CSI) that operates connected to a single phase grid is presented.
Abstract: In this work it is presented a technique to reduce DC link oscillation in Voltage Source Inverter (VSI) or Current Source Inverter (CSI) that operates connected to a single phase grid. That oscillation can be responsible for losses or malfunctioning of the DC sources (photovoltaic panels or batteries). It is also may cause efficiency reduction of photovoltaic generators. The oscillation reduction can be achieved by adding two power switches and a passive energy storage element to the converter topology. Details about design and control strategies for both topologies, which has demonstrated performance improvements, when compared with others solutions, are presented. Simulation and experimental results are provided to validate the theoretical approach and to evaluate the topologies performance and quantify energy efficiency gain.
29 citations
21 Nov 2011
TL;DR: In this article, the authors presented a technique to reduce DC link pulsation due to the pulsating single-phase energy flow in Voltage Source Converter (VSC) and current source converter (CSC).
Abstract: In this work it is presented a technique to reduce DC link pulsation due to the pulsating single-phase energy flow in Voltage Source Converter (VSC) and Current Source Converter (CSC). The pulsation reduction is achieved by adding two power switches and a passive energy storage element to the converter. Both, rectifier and inverter operation are evaluated. Details about design and control strategies, which has demonstrated performance improvements, when compared with others solutions, are presented. Simulation and experimental results are provided to validate the theoretical approach.
9 citations
01 Nov 2011
TL;DR: In this article, a photovoltaic lighting system based on a modified quasi-Z-source power converter topology is proposed, where the power converter operates as a quasi-z-source topology for powering the light source from the energy stored battery bank.
Abstract: This paper proposes a photovoltaic lighting system based on a modified quasi-Z-source power converter topology. In the absence of sunlight the power converter operates as a quasi-Z-source topology for powering the light source from the energy stored battery bank. When there is enough sunlight, the power converter operates in a reverse mode and the photovoltaic energy is stored in a battery bank. Selected simulation and experimental results are included to show the feasibility of the proposed system.
8 citations
06 Mar 2011
TL;DR: In this paper, a photovoltaic lighting system based on a power converter that combines the Z-source and the quasi-Z-source topologies was proposed, where the reactive components can be shared for reducing weight, volume and cost.
Abstract: This paper proposes a photovoltaic lighting system based on a power converter that combines the Z-source and the quasi-Z-source topologies. When there is enough sunlight the power converter operates similarly as the quasi-Z-source topology and thus the photovoltaic energy is stored in a battery bank. In the absence of sunlight the power converter operates similarly as the Z-source topology for powering the light source from the energy stored in the battery bank. The reactive components can be shared for reducing weight, volume and cost. Selected experimental results are included to show the feasibility of the proposed system.
4 citations
21 Nov 2011
TL;DR: In this article, an active power filter configuration with an external power source tied to the DC bus is discussed, which allows voltage compensation as well as controlling the active power flow at the grid.
Abstract: This work discuss an active power filter configuration which allows voltage compensation as well as controlling the active power flow at the grid. The proposed configuration has an external power source tied to the DC bus thus allowing to deliver or to absorb energy. The steady-state characteristics, the design of the control law and experimental results are presented and discussed. In the experimental tests undervoltage-overvoltage compensation and power injecting-drawing for purely resistive and, strongly inductive load have been investigated. In all the cases, the proposed configuration provides load voltage regulation within the nominal specifications (notch depth below 10% and total harmonic distortion below 4%) whereas the average value of three-phase power fluctuates around the reference value specified for the active power.
3 citations
01 Aug 2011
1 citations
01 Nov 2011
TL;DR: In this paper, the authors presented a methodology to identify and diagnose a furtive or intermittent fault in three-phase inverter converter using a function wavelet mother type Mexican Hat.
Abstract: Wavelets are attractive for applications that require analysis of electrical signals In contrast to classical methodologies used to determine the spectrum of a signal in steady-state or not, and thanks to the STFT (Short Time Fourier Transform), wavelets are an interesting approach which is efficient to localize temporal peculiarities This work presents a methodology to identify and diagnose a furtive or intermittent fault in three-phase inverter converter using a function wavelet mother type Mexican Hat Such monitoring is based on the stator current analysis of an induction motor Simulation and experimental results validate this study considering only the fault in the converter supplying the machine in open loop