Journal Volume 12 Issue 2

Investigations on the controllability and the design of DC/DC convertors connected to PV-generators

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Christian P. Dick, Klaus Rigbers, Harald Radermacher, Rik W. De Doncker

This paper presents analytical and computer aided investigations on photovoltaic (PV) - generators connected to DC/DC converters for module integrated inverters. It shows the controllability and describes how to design the converters regarding requirements such as a wide variable input voltage range, a constant output voltage and a variable transferred power, depending on temperature, solar radiation and the PV-generator itself.

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Application of Z-source converter in photovoltaic grid-connected transformer-less inverter

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Babak Farhangi, Shahrokh Farhangi

In PV grid connected power conditioners, usually both stepping-up the PV array voltage, and stepping-down the dc bus voltage for injection of a sinusoidal current to the grid is required. In this paper the design procedure of Z-source converter as a single phase PV grid connected transformer-less inverter is presented. The converter has one switch less than the conventional two stage power conditioner, which leads to reduction of cost.

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Analysis of IGCT turn-on transients in circuit configurations with series connected diodes

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Sven Tschirley, Steffen Bemet

This paper describes the effect of series connected diodes and their balancing networks m the clamp circuit in IGCT converters. It is shown, that the balancing of the clamp diodes has other requirements than the balancing of the series connected freewheeling diodes in the switch cell. The dynamic and static balancing of the clamp diodes is analyzed in detail.

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Digitally controlled interface between supercapacitor energy storage and DC link

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Mieczysław Nowak, Juliusz Hildebrandt, Jacek Rabkowski, Roman Barlik

In the paper specification of a complex converter designed as an interface between a supercapacitor energy storage battery and other DC auxiliary links, with emphasis on its control system, and some laboratory investigation results, is presented. The converter applied in the solution contains a DC/DC power controller and a DC/AC/DC medium frequency intermediate link with a transformer, permitting good voltage matching.

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Control circuit for series active power filters based on programmable logic devices

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Henryk Supronowicz, Andrzej Olszewski, Hubert Gawiński

This paper describes a control circuit for the active power filters working with three-phase AC power line. It describes logic circuitries as well as laboratory test results. The control circuit was realized with programmable logic devices, fast analog-to-digital and digital-to-analog converters. Proposed system working with open-loop control, it allows significantly simplifying its logic structure. Programmable logic devices do simultaneously a few independent tasks, so a control algorithm can be performing fast, improving considerably compensation dynamic.

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Harmonic compensation using the sliding DFT algorithm for three-phase active power filter

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Krzysztof P. Sozański

This paper describes the sliding discrete Fourier transform (DFT) algorithm as an alternative for typical DFT used for spectrum analysis and synthesis. As an example a control circuit for a three-phase 75 kVA parallel active power filter (APF) is used. Such filters have been built and tested. Some illustrative, experimental results are also presented in the paper. The control algorithms of the proposed APF are implemented in the fixed-point digital signal processor TMS320C50.

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Implementation of a digital signal processor-controlled shunt active filter

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Leonardo R. Limongi, Marcelo C. Cavalcanti, Francisco A.S. Neves, Gustavo M.S. Azevedo

This paper presents the implementation of an active filter configuration for harmonic compensation. The system can be controlled for current harmonics and reactive power compensations simultaneously by using a converter operating as active shunt filter. A synchronous reference frame based controller is compared to an instantaneous reactive power based controller. The synchronous reference frame method is chosen to control the converter due to the better performance when the supply voltage is distorted.

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