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Proceedings ArticleDOI: 10.1109/PESTSE.2016.7516495

Design and development of a high step-up DC-DC Converter for non-conventional energy applications

01 Jan 2016-pp 1-4
Abstract: In this article a high step up DC-DC Converter which is integrated with renewable energy resources is proposed. The disadvantage of conventional converters is that it has high duty ratio and high voltage stress across power devices with less efficiency. The proposed methodology uses flyback converter to obtain high static voltage gain to improve the efficiency of the converter by reducing the voltage stress across the switch and diodes. Thus by avoiding the operation of the high duty ratio and recycling of coupled inductor stored energy, the overall efficiency of the converter gets improved. more

Topics: Flyback converter (71%), Forward converter (70%), Buck–boost converter (70%) more

Book ChapterDOI: 10.1007/978-981-10-4286-7_29
01 Jan 2018-
Abstract: In this paper, a novel fuzzy logic-based control (FLC) strategy is developed to perform multi-function strategy for smooth and controlled operation of three-phase renewable energy system (RES)-based wind energy conversion system (WECS) with grid integration. The inverter acts as an converter to infuse the power obtained from the wind energy and as a active power filter to compensate reactive power demand and load current harmonics. The control strategies in accordance with 3-phase 4-wire unbalanced load tend to appear as a balanced linear load system at grid. The control strategy is developed and validated using MATLAB/Simulink. The proposed controller is compared with PI-based controller and validate that the proposed FLC provide better efficiency by reducing harmonics. more

Topics: Wind power (61%), Distributed generation (58%), Control theory (58%) more

8 Citations

Book ChapterDOI: 10.1007/978-981-10-4286-7_26
01 Jan 2018-
Abstract: In this paper, a six-switch AC/DC/AC converter is proposed for single-phase wind energy system application. The proposed converter consists of two arms with three switches in each, where the top layer switches are used for the rectification mode and lower layer switches are used for the inversion mode of operation. The middle layer switches are shared by the both rectification and inversion mode operation based on the modified PWM scheme. A small rated DC link capacitor is chosen by providing suitable coordination control and EX-OR gate logic between the rectification and inversion mode of operation. The proposed single-phase six-switch converter has the advantage of both reduced number of switches and small DC link capacitor size. To validate the effectiveness of the proposed converter, simulation results are presented for 1 kW wind system. more

Topics: Boost converter (64%), AC/AC converter (64%), Buck converter (62%) more

3 Citations

Proceedings ArticleDOI: 10.1109/PEDSTC.2017.7910385
01 Jan 2017-
Abstract: Renewable energy sources such as; solar array, wind turbine or fuel cell, need a step-up converter to produce proper and useful voltage levels. In this paper a high step-up converter with three coupled inductors called Y-source impedance network, which can provide a very high boost at lower shoot-through duty cycle of switch and has one more degree of freedom to achieve voltage boost is utilized. In This case, in order to Maximum Power Point Tracking (MPPT) of the solar energy in photovoltaic (PV) system, the incremental conductance method is improved. The proposed method guaranties the MPPT realization with subject to wide changes of load resistance and various atmospheric conditions. Simulation results demonstrate the superiority of the proposed incremental conductance MPPT technique than conventional method due to dynamic response. These results are in good agreement and prove the effectiveness and capability of the method. more

1 Citations


Journal ArticleDOI: 10.1109/TPEL.2002.807188
Abstract: Many applications call for high step-up DC-DC converters that do not require isolation. Some DC-DC converters can provide high step-up voltage gain, but with the penalty of either an extreme duty ratio or a large amount of circulating energy. DC-DC converters with coupled inductors can provide high voltage gain, but their efficiency is degraded by the losses associated with leakage inductors. Converters with active clamps recycle the leakage energy at the price of increasing topology complexity. A family of high-efficiency, high step-up DC-DC converters with simple topologies is proposed in this paper. The proposed converters, which use diodes and coupled windings instead of active switches to realize functions similar to those of active clamps, perform better than their active-clamp counterparts. High efficiency is achieved because the leakage energy is recycled and the output rectifier reverse-recovery problem is alleviated. more

Topics: Converters (55%), Charge pump (54%), Leakage (electronics) (52%) more

938 Citations

Journal ArticleDOI: 10.1109/TPEL.2009.2012527
Abstract: This paper discusses the evaluation of different current controllers employed for grid-connected distributed power generation systems having variable input power, such as wind turbines and photovoltaic systems. The focus is mainly set on linear controllers such as proportional-integral, proportional-resonant, and deadbeat (DB) controllers. Additionally, an improved DB controller robust against grid impedance variation is also presented. Since the paper discusses the implementation of these controllers for grid-connected applications, their evaluation is made in three operating conditions. First, in steady-state conditions, the contribution of controllers to the total harmonic distortion of the grid current is pursued. Further on, the behavior of controllers in the case of transient conditions like input power variations and grid voltage faults is also examined. Experimental results in each case are presented in order to evaluate the performance of the controllers. more

Topics: Gain scheduling (63%), Control system (59%), Control theory (57%) more

806 Citations

Journal ArticleDOI: 10.1109/TIE.2009.2022512
Abstract: Conventional dc-dc boost converters are unable to provide high step-up voltage gains due to the effect of power switches, rectifier diodes, and the equivalent series resistance of inductors and capacitors. This paper proposes transformerless dc-dc converters to achieve high step-up voltage gain without an extremely high duty ratio. In the proposed converters, two inductors with the same level of inductance are charged in parallel during the switch-on period and are discharged in series during the switch-off period. The structures of the proposed converters are very simple. Only one power stage is used. Moreover, the steady-state analyses of voltage gains and boundary operating conditions are discussed in detail. Finally, a prototype circuit is implemented in the laboratory to verify the performance. more

Topics: Voltage reference (64%), Equivalent series resistance (56%), Converters (55%) more

560 Citations

Journal ArticleDOI: 10.1109/TIE.2011.2107721
Abstract: In this paper, a novel high step-up dc-dc converter for distributed generation systems is proposed. The concept is to utilize two capacitors and one coupled inductor. The two capacitors are charged in parallel during the switch-off period and are discharged in series during the switch-on period by the energy stored in the coupled inductor to achieve a high step-up voltage gain. In addition, the leakage-inductor energy of the coupled inductor is recycled with a passive clamp circuit. Thus, the voltage stress on the main switch is reduced. The switch with low resistance RDS(ON) can be adopted to reduce the conduction loss. In addition, the reverse-recovery problem of the diodes is alleviated, and thus, the efficiency can be further improved. The operating principle and steady-state analyses are discussed in detail. Finally, a prototype circuit with 24-V input voltage, 400-V output voltage, and 200-W output power is implemented in the laboratory to verify the performance of the proposed converter. more

Topics: Boost converter (70%), Charge pump (62%), Filter capacitor (61%) more

240 Citations

Journal ArticleDOI: 10.1109/TIA.2011.2175473
Abstract: In this paper, a modular interleaved boost converter is first proposed by integrating a forward energy-delivering circuit with a voltage-doubler to achieve high step-up ratio and high efficiency for dc-microgrid applications. Then, steady-state analyses are made to show the merits of the proposed converter module. For closed-loop control design, the corresponding small-signal model is also derived. It is seen that, for higher power applications, more modules can be paralleled to increase the power rating and the dynamic performance. As an illustration, closed-loop control of a 450-W rating converter consisting of two paralleled modules with 24-V input and 200-V output is implemented for demonstration. Experimental results show that the modular high step-up boost converter can achieve an efficiency of 95.8% approximately. more

Topics: Boost converter (69%), Ćuk converter (67%), Buck–boost converter (65%) more

176 Citations

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