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DC/DC converters have been tremendously utilized nowadays. In some special applications such as military, aerospace, and precision instrumentation, the output voltage ripple of DC/DC converters has to be maintained in an acceptable level to achieve superior performance. For example, DC/DC converters are tied with inverter for adjustable speed motor controls or renewable energy interface with utility...
This paper presents a new direct integration scheme for supercapacitors that are used to mitigate short term power fluctuations in wind power systems. The proposed scheme uses the popular dual inverter topology for grid connection as well as interfacing a supercapacitor bank. The dual inverter system is formed by cascading two 2-level inverters named as the “main inverter” and the “auxiliary inverter”...
This paper presents the modelling and simulation of proton exchange membrane (PEM) fuel cell (FC) together with a dc-dc converter and dc-ac inverter. The need for the dc-dc converter arises as a result of the output voltage generated from the FC which fluctuates with variation in load. The FC voltage is therefore, controlled using dc-dc converter to provide a regulated dc voltage output at 220 V for...
In the last decade, the development of the photovoltaic systems connected to the electric system, for residential use, has been increased; in order to contribute with a part of the power during the day. One of the applied concepts is the plug & play (AC module). These systems use an integrated modular converter, formed by the combination, dc-dc converter plus inverter, to adapt the voltage generated...
This paper describes the boost mode test of a current source inverter (CSI) fed permanent magnet synchronous motor (PMSM) drive. By using a dc-dc converter together with the CSI, the output voltage of the CSI can be boosted. The modified field oriented control scheme for this CSI PMSM drive is explained and tested in real-time control. The modeling and experimental results show the CSI can drive the...
An efficient DC-DC converter is needed as the interface between a low-voltage fuel cell source and a constant DC bus for inverter operation. Zero-voltage-switching (ZVS) push-pull forward (PPF) converter is very fit for low input-voltage application. However, the output-voltage variation range of the fuel cell is wide, and the PPF converter cannot realize ZVS under wide input-voltage range. In order...
This paper discusses the multilevel boost converter, a DC-DC converter recently proposed. The DC-DC multilevel boost converter is based on one inductor, one switch, 2N-1 diodes and 2N-1 capacitor, for an Nx converter, it is a boost converter able to control and maintain the same voltage in all the N output levels, and able to control the input current. The application proposed in this paper is the...
The paper focuses on a method to interface a power buffer based on supercapacitors (SCs) to a system with a stiff DC voltage. An optimized design methodology is given, showing that the proposed system is able to fully control the power flow between the SCs and the DC-link, making use of reduced-rating switching devices and magnetic components. Losses of the proposed system are analytically evaluated...
In the photovoltaic branch, transformerless inverters are nowadays the majority of the systems installed in Europe, mainly because of the higher level of efficiency and reduced cost and weight when compared with their counterparts with transformer, whether this concerns low- frequency or high-frequency models. Nevertheless, some limitations arise for the operation of such systems, mainly regarding...
The utilization of fuel cells for stand alone and distributed power generation requires the development of a low loss voltage source inverter that converts a fuel cell's variable DC output into a fixed useful AC. This work is based on a double DC boost stage and a conventional bridge output inverter stage. The DC input from the fuel cell is boosted from 40 V at full load to 300 VDC and is fed to the...
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