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ABSTRACT: This paper presents a soft-switching (ZVS) boost converter integrated in such a way to obtain, in a single conversion stage, the maximum energy extraction from photovoltaic panels, battery charging and discharging dynamic control, and high voltage step-up to the inverter DC bus, also operating with soft-switching capability. In order to verify its effectiveness, experimental results from this converter are presented. Theoretical analysis, operation principle and topology details are also presented and studied. High voltage gain, low switching stress, small switching losses, and high efficiency are expected from this topology.
Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE; 04/2011
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ABSTRACT: The concept is presented of converters integrated in such a way as to obtain, in a single conversion stage, the maximum energy extraction from photovoltaic panels, battery charging and discharging dynamic control, and high voltage step-up to the inverter DC bus, also operating with soft-switching capability. Although this idea can be applied to most of the high voltage gain topologies, this presented report is based on structures derived from the half-bridge boost converter. Thus, a 500 W prototype, with input voltage of 24 V and output voltage of 200 V, has been developed with the purpose of obtaining experimental results and validating the proposed concept. High efficiency is achieved, above 92.5, confirming the expected operation and functionalities necessary for the proposed application.
Electronics Letters 02/2011; · 0.96 Impact Factor
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ABSTRACT: In order to give support to the growing technology demand of renewable energy applications, this paper presents a new converter topology for battery charging feasible to photovoltaic systems. The proposed converter presents in a single stage a large voltage step-up, high efficiency, and reduced voltage stress on switches due to the transformer. Also ZVS soft switching is naturally achieved a lowing high frequency operation and low commutation losses. Following, it will be shown the topology, its operation principle, and the preliminary results for a 500W load.
Industry Applications (INDUSCON), 2010 9th IEEE/IAS International Conference on; 12/2010
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ABSTRACT: This paper presents an interleaved-boost converter, magnetically coupled to a voltage-doubler circuit, which provides a voltage gain far higher than that of the conventional boost topology. Besides, this converter has low-voltage stress across the switches, natural-voltage balancing between output capacitors, low-input current ripple, and magnetic components operating with the double of switching frequency. These features make this converter suitable to applications where a large voltage step-up is demanded, such as grid-connected systems based on battery storage, renewable energies, and uninterruptible power system applications. Operation principle, main equations, theoretical waveforms, control strategy, dynamic modeling, and digital implementation are provided. Experimental results are also presented validating the proposed topology.
IEEE Transactions on Power Electronics 12/2010; · 4.65 Impact Factor
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ABSTRACT: This paper proposes the use of a three-phase high-frequency semicontrolled rectifier for wind energy conversion systems based on permanent magnet generators. The main advantages of the topology are: simplicity, since all active switches are connected to a common point, robustness, as short-circuit through a leg is not possible, and high efficiency due to reduced number of elements. As a disadvantage, higher but acceptable total harmonic distortion of the generator currents results. The complete operation of the converter and theoretical analysis are presented. Additionally, a single-phase pulsewidth modulation inverter is also employed in the grid connection. Experimental results on 5-kW prototype are presented and discussed.
IEEE Transactions on Power Electronics 04/2010; · 4.65 Impact Factor
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ABSTRACT: This paper presents a three-phase voltage doubler rectifier based on three-state switching cells for Uninterruptible Power Supply (UPS) applications using FPGA. Its main features are: high power factor, reduced conduction losses, weight and volume, simple control strategy based on One-cycle Control (OCC), and connection between input and output enabling the use of inverter and bypass. A theoretical analysis, simulation results and preliminaries experimental results from a 9 kW development stage lab model are presented.
Applied Power Electronics Conference and Exposition (APEC), 2010 Twenty-Fifth Annual IEEE; 03/2010
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ABSTRACT: This paper presents a high frequency isolated pre-regulator using the self-control technique, which aims to provide a 400 Vdc link with input power factor correction. The main feature of self-control technique, as the OCC one, is the direct loop feedback from the input current, using the converter parameters for the current loop control. The input voltage sample is not necessary, as in several others PFC theories. The technique was carried out using a DSPIC from MICROCHIP. A 2 kW prototype was assembled and its experimental waveforms will be presented on this paper.
Industrial Electronics, 2009. IECON '09. 35th Annual Conference of IEEE; 12/2009
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ABSTRACT: This paper proposes the use of a three-phase high frequency semi-controlled rectifier operating in the discontinuous conduction mode, feasible for small wind energy conversion systems based on permanent magnet generator. The main advantages of the topology are: simple gate drive circuits, since all active switches of the rectifier are connected to a common point; robustness, as short circuit through a leg is not possible; high efficiency due to reduced number of elements; simplicity since the DCM operation avoid feedback circuits and sensors as well as it allows open loop control. As a disadvantage, higher but acceptable THD of the generator currents results. The complete operation of the converter and theoretical analysis are presented. Additionally, a conventional single-phase PWM inverter is also employed in the grid connection. Experimental results on 1.6 kW prototype are presented and discussed.
Power Electronics Conference, 2009. COBEP '09. Brazilian; 11/2009
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ABSTRACT: In this paper it is proposed a new topology of three-phase controlled rectifier feasible for high power wind energy conversion systems (WECS). This rectifier is based on the bridgeless rectifier, uses six wires of the generator, and allows the operation with high power factor, increasing the generator efficiency. One cycle control (OCC), which avoids the need of sinusoidal reference signals, was used in the rectifier control. This study is then concerned with the operation principle and experimental results obtained from a 5 kVA prototype.
Power Electronics Conference, 2009. COBEP '09. Brazilian; 11/2009
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ABSTRACT: This paper presents control system design of a small size wind generation system for battery charging using a multiblade wind turbine. A boost converter is used to regulate the battery bank voltage. Thus, an MPPT algorithm can be implemented as well as the reduction of the mechanical speed can be performed in order to avoid a battery overcharging or overcurrent. The system overview and modeling are presented including characteristics of wind turbine, generator, batteries, power converter, control system, and supervisory system. A simulation of the system is performed using MATLAB/SIMULINK software to obtain the MPPT points. Experimental results for the complete system are also presented.
Power Electronics Conference, 2009. COBEP '09. Brazilian; 11/2009
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ABSTRACT: This paper presents a novel topology for double conversion uninterrupted power supply (UPS). The most important characteristics of this converter are: low cost, low conduction and commutation losses on all the controlled switches, the control is implemented with commercial integrated circuits, and the rectifier and the inverter are on the same circuit. Theoretical analysis, operation principle, and topology details are presented and validated through experimental results.
Power Electronics Conference, 2009. COBEP '09. Brazilian; 11/2009
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ABSTRACT: This paper investigates a mathematical model of a boost converter based on three-state switching cell and voltage multipliers cells (mc). The proposed analysis is based on the tool ¿PWM-switch modeling of DC-DC converters¿. Two situations are analyzed: operation with one voltage multiplier cell (mc=1) and operation considering the number of voltage multiplier cells greater than 1 (mc>1). The proposed method was validated through simulations and it was verified its effectiveness. In addition, it is also analyzed in this work the conventional average current mode control applied to the configuration with two voltage multiplier cells (mc=2). The performance of the converter and the effectiveness of the proposed controller are demonstrated by simulations and experimental results for a 1 kW laboratory prototype.
Power Electronics Conference, 2009. COBEP '09. Brazilian; 11/2009
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ABSTRACT: This work introduces an innovative low cost topology for a wind conversion system with an efficient output power control in order to meet the battery charge requirements. The project is in accord with the specifications required at IFEC 2009 (the 2009 International Future Energy Challenge, sponsored by IEEE). The proposed topology is based on a high frequency discontinuous conduction mode three-phase semi-controlled rectifier associated with buck converter. The converter is controlled by a system composed of three loops, which limit the current and the voltage to the maximum values allowed by the batteries and the voltage over the DC bus. There is also a MPPT algorithm that intends to maximize the power extracted from the turbine/generator association.
Power Electronics Conference, 2009. COBEP '09. Brazilian; 11/2009
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ABSTRACT: This paper aims to analyze and project a digital controller using a low cost DSPIC applied to a pre-regulator with power factor correction intermediated by the eigen control strategy. All the controller project steps are detailed in this paper.
Applied Power Electronics Conference and Exposition, 2009. APEC 2009. Twenty-Fourth Annual IEEE; 03/2009
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ABSTRACT: This paper presents a new current-doubler rectifier for application on buck derived DC-DC converters, such as, push-pull, half-bridge, full-bridge, dual-bridge, NPC three-level, and others. This new proposal, named as Three-State Rectifier (TSR), is generated using the three- state switching cell. The proposed rectifier is similar to the Center Tapped Rectifier (CTR), and to the current-doubler rectifier named Interleaving Rectifier (IR). The new rectifier circuit is an alternative to substitute the previous rectifiers topologies, operating with rectifier diodes only, or with synchronized switches depending on the output voltage rating. Advantages of such a new proposal are: the current through the components of the converter are less pulsated which reflects in the conduction losses reduction and the current in the secondary winding of the transformer reaches maximum half of the output average current. The disadvantage of the proposed converter is that the sizes of the autotransformer and the inductor, both equals, are 20% higher than the sizes of the inductors of the IR rectifier. In order to verify the theoretical analysis and compare its performance with similar ones proposed in literature, experimental results consisting of relevant waveforms and curves from a full-bridge phase-shift control DC-DC converter with TSR rectifier and IR rectifier are presented, for a 1.5 kW output power prototype, an input voltage of 400 V and output voltage of 60 V.
Power Electronics Specialists Conference, 2008. PESC 2008. IEEE; 07/2008
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ABSTRACT: In this paper a soft-switching interleaved boost converter with high voltage gain is presented. The high voltage gain converter is far suitable for applications where a high step-up voltage is required, as in some renewable energy systems, which use, for example, photovoltaic panels and/or fuel cells. Besides, in order to guarantee small switching losses and, consequently, a high efficiency, a non- dissipative soft-switching cell with auxiliary commutation circuit is used. Thus, a large step-up voltage, low switching stress, small switching losses, and high efficiency are expected from this topology. In order to verify its effectiveness, experimental waveforms from the high voltage gain converter operating with hard-switching and soft-switching are compared. Also, waveforms from the soft-switching cell are presented and analyzed. Theoretical analysis, operation principle and topology details are also presented and studied.
Power Electronics Specialists Conference, 2008. PESC 2008. IEEE; 07/2008
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ABSTRACT: In this paper a novel interleaved boost converter with high voltage gain and bidirectional operation is presented. High efficiency and low stress in the switches are expected. The great voltage limit range in bidirectional mode allows that this topology is far suitable for renewable energy systems applications.
Applied Power Electronics Conference and Exposition, 2008. APEC 2008. Twenty-Third Annual IEEE; 03/2008
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ABSTRACT: This paper proposes a topology of three-phase controlled rectifier feasible for small wind energy conversion systems. This rectifier uses six wires of the generator and allows for the operation with high power factor, increasing the generator efficiency. One Cycle Control (OCC) was used in the rectifier control. This study is concerned with the operating principle, a design example, and some simulation and experimental results for a 5 kW prototype.
Applied Power Electronics Conference and Exposition, 2008. APEC 2008. Twenty-Third Annual IEEE; 03/2008
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ABSTRACT: The wind energy system presented in this paper uses a permanent magnet generator connected to a three- phase semi-controlled rectifier. Although an acceptable THD and power factor result, the proposed converter is simple, cheaper, and robust. Additionally, a single-phase PWM inverter is also employed in the grid connection. The inverter uses a double hysteresis in the control of the current injected in the grid, what implies reduced switching losses. Analysis and partial experimental results are presented for a 5 kW prototype. At the final version of this paper, a more detailed theoretical analysis, simulation results, as well as experimental results at rated power are supposed to be presented.
Applied Power Electronics Conference and Exposition, 2008. APEC 2008. Twenty-Third Annual IEEE; 03/2008
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ABSTRACT: This work presents the analysis, design, simulation and experimental development of a single-phase inverter with high frequency transformer isolation and for a wide input voltage range. The high frequency input current ripple is mitigated by the use of a small input LC filter, and the low frequency current component injected by the inverter is attenuated by the voltage loop controller. The proposed topology can be used in dc voltage- sourced applications such as renewable energy and battery systems.
Industrial Electronics, 2007. ISIE 2007. IEEE International Symposium on; 07/2007
