TRANSACTIONS ON ELECTRICAL ENGINEERING

ISSN 1805-3386

September 19, 2018








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2018 No.1

Efficient Technique for Model Order Reduction Retaining Non-Minimum Phase Characteristics using Clustering Dominant Pole-Zero Algorithm

Abraham, A., Pappa, N., Honc, D.

Model Order Reduction (MOR) challenges a high dimensional problem and plays a key role in areas where dynamic simulation studies are necessary for modern simulation strategy. Many conventional reduction methods namely, reduced order models based on Least Square Method (LSM), Balanced Truncation, Hankel Norm reduction, Dominant Pole Algorithm (DPA) and CDPA method have been developed in the field of control theory. Among these, recently proposed Clustering Dominant Pole Algorithm (CDPA) is able to compute the full set of dominant poles and their cluster center efficiently. In this paper, a hybrid algorithm for model order reduction known as Clustering Dominant Pole-Zero Algorithm (CDPZA) is proposed to identify and preserve the dominant zeros of the processes exhibiting non-minimum phase behaviour. The CDPZA method combines the features of clustering method and DPA. Further, the cluster centers of the dominant zeros in the numerator polynomial are determined using factor division algorithm. The Benchmark HiMAT system of 6th order is considered for testing and validation of the proposed algorithm. The simulation studies are carried out to show the efficacy of the proposed algorithm over conventional MOR algorithms.

 

Keywords: dominant pole, dominant zero, non-minimum phase, model order reduction, balanced truncation, Hankel norm, clustering.

 

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Comparison of Various Configuration of Wireless Power Transfer System

Zavřel, M., Kindl, V.

This article deals with mutual comparison of different resonant tank configurations of the wireless power transfer (WPT) systems. Tested compensation configurations are classified as series-series, series-parallel, parallel-series and parallel-parallel and all of them are operated with the input and output frequency converters and other supplementary electronics. As parameter we chose the transfer distance and load. The comparison is made according to changes in overall system efficiency and power delivered to the load along varying both the load and operational distance. All theoretical findings are experimentally verified and discussed in the conclusion section.

 

Keywords: wireless power transfer system, efficiency, power, resonant tank compensation.

 

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Design of a Dispensing CNC Device

Drgoňa P. , Štefún R., Štefke Ľ.

This article deals with the design and practical realization of a CNC device designed for the application of viscous materials, such as a thermal conducting paste. Paste is used for effective heat transfer what is essential in switched mode power supplies. However, its application on surface can be an issue. Designed CNC device serves for easier and more accurate application in production process using standard tubes.

 

Keywords: design, CNC control, ball screw, stepper motor.

 

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Smart Power Generation & Storage TEDOM

Bičák, T., Kolomazníková, H.

The contribution describes the project implemented in the production plant of TEDOM. It defines the part of the premises where the buildings are supplied with electric power from the photovoltaic power plant in collaboration with a CHP unit. A battery system is employed to compensate for the imbalances between the power generation and consumption. Yet the buildings are completely independent of the connection to the distribution network. Thus, it is a so-called "off-grid" operation.

 

Keywords: off-grid operation, CHP unit, photovoltaic power plant, battery.

 

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