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This work presents, phase modulated current fed DC/DC converter has been developed for fuel/photovoltaic cell standalone system, and it interfaces the low voltage output fuel/photovoltaic cell powered higher voltage DC bus system (255 V–425 V). The purpose of transformer is to provide the protection by providing matching voltage level and galvanic isolation. Stepped up DC voltage is then inverted...
This paper presents the development of a single-phase online Uninterruptable Power Supply (UPS) system using a HPF front-end Boost converter with integrated Power Factor Correction (PFC) and DC-DC functions and an ordinary Full-Bridge as the single-phase output inverter. Besides the front-end stage with integrated PFC and DC-DC functions, the main feature of the proposed solution is the use a Proton...
Multilevel inverters have been drawing growing attention in the recent years especially in the distributed energy resources area due to the fact that several batteries, fuel cells, solar cell, wind and micro turbines can be connected through multilevel inverter to feed a load or the ac grid. Multilevel inverter becomes an alternative in the area of high power medium-voltage energy control. Recently...
The DC current of the single-phase inverter or rectifier contains low frequency ripple whose frequency is twice that of the AC voltage. Traditionally, electrolytic capacitor is used to eliminate these ripple, but it has relatively short lifespan and affect the lifetime of the entire inverter or rectifier system. In this paper, a single-phase bidirectional bridge topology without electrolytic capacitor...
This paper proposes a DC-AC conversion system adapted to an electric vehicle with fuel cell. This conversion chain consists of a fuel cell, a unidirectional converter, an isolated bidirectional converter, an inverter, and a second voltage source. Matlab-Simulink is used in order to verify the theoretical results.
This paper presents a novel power converter topology for PEM solid state fuel cells. The proposed topology consists in an integrated DC/DC and DC/AC converters that can inject electrical power from a low voltage fuel cell into a low voltage monophasic line (100–220Vac). As this topology is suitable to step-up low voltages presents in fuel cell stacks output, it can be also applied in photovoltaic...
This paper explains the design of multilevel inverter for fuel cell and photovoltaic cell. The hybrid power sources are connected to the load by the hybrid cascaded multilevel inverter. The hybrid cascaded multilevel inverter has the minimum number of switching and increases the voltage level with low harmonic distortion and low switching losses. Multilevel inverter is able to handle high voltage...
Normally fuel cell based power supply system needs a power conditioner to convert the low DC output voltage generated by the fuel cell into usable AC voltage for any practical application. For proper power conditioning design fuel cell electrical characteristics as well as customer requirements must be taken into account. Therefore, in this paper, a practical design methodology for two-stage power...
Renewable energy sources such as Photovoltaics (PVs) and Fuel Cells (FCs) generate DC voltage/current and have a high internal resistance/nonlinear V/I dependence, which is why a digitally controlled power electronic interface is always needed to facilitate connection to an AC grid and maximum power extraction. This paper evaluates four single-stage power electronic converters for PVs: the traditional...
This paper proposes a 1.0kW grid-tied inverter system for fuel cells. Since the fuel cells in this study have a variable output voltage range of 30~70V, the high DC link voltage is required to obtain a 220V ac voltage at the output of the system. For this, a DC-DC converter with a high conversion ratio should be required. However, the achievement of high conversion ratio in DC-DC converters generally...
A high-efficiency fuel cell power conditioning system with input current ripple reduction is proposed. The proposed system consists of a high-efficiency high-step-up current-fed resonant push-pull converter and a full-bridge inverter. The converter conserves inherent advantages of a conventional current-fed push-pull converter such as low input-current stress and high voltage conversion ratio. Also,...
This paper investigates the potentials of a hybrid cascaded multilevel inverter in the development of high-power AC power supplies with specific emphasis on power conditioning systems (PCS) for alternate sources of energy. Fuel cell generation systems in particular are expected to see increasing practical usage due to several advantages they offer over conventional generation systems. This article...
This paper presents the design and analysis of a new configuration of parallel connected inverter suitable for fuel cell system application. The configuration consists of DC/DC converter and parallel three-phase DC/AC inverter. Series resistors added to the inverter output to maintain same current in each inverter of the two parallel inverters, and to reduce the circulating current in the parallel...
Fuel cells for low or medium power deliver comparatively low voltages compared to the mains voltage at high currents. A high dc-link voltage is needed to feed in electrical energy from fuel cells to the mains via a voltage source inverter. Several well known DC/DC converters can be used to transform the varying fuel cell voltage to the requested amplitude of the dc-link-voltage. Besides transformerless...
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