scholarly journals Planning and Building Electric of an Flower Carnival Car at University of Debrecen

2019 ◽  
Vol 11 (1) ◽  
pp. 19-22
Author(s):  
Antal Apagyi ◽  
Tamás Szmolka ◽  
Géza Husi
Keyword(s):  
Electric Power ◽  
Carrying Capacity ◽  
Planning Process ◽  
Battery Pack ◽  
Variable Frequency ◽  
Electric Motors ◽  
Three Phase ◽  
Variable Frequency Drives ◽  
The Creation

Abstract In this research we will discuss the creation of the flower cart. It will be examined from an economical and environmental perspective. Additionally, the planning process regarding the carrying capacity and battery runtime will be explained. The cart is moved by three-phase electric motors which are controlled by Variable Frequency Drives (VFD). Electric power is supplied by the large battery pack. Overall, the purpose of this vehicle is to be able to participate in the carnival march while increasing the quality of the event.

scholarly journals Comparative study of frequency converters of three-phase electric motors in automatic control of technological parameter

2021 ◽  
Vol 2 (3) ◽  
pp. 48-56
Author(s):  
Margarita M. Blagoveshchenskaya ◽  
Mikhail V. Veselov
Keyword(s):  
Pid Controller ◽  
Technological Parameter ◽  
Test Bench ◽  
Frequency Converter ◽  
Electric Motors ◽  
Technological Parameters ◽  
Frequency Converters ◽  
Ac Motors ◽  
Three Phase

Frequency converters of asynchronous three-phase AC motors are widely used in industry, including food production. A thorough understanding of the technical capabilities of frequency converters contributes to their efficient use. This article discusses a technical comparison of two frequency converters of three-phase electric motors of the Russian company "OWEN" and the Danish company "DANFOSS" according to the criterion of the quality of regulation of the technological parameter. For comparison, a test bench was created, in which the devices were tested in turn, under the same conditions. During the preparation and implementation of testing, it turned out that the hardware capabilities of frequency converters for their use in regulating technological parameters are the same, and the parametric capabilities are different. The frequency converter of the "OWEN" company is equipped with a PI controller, and the frequency converter from "DANFOSS" is equipped with a PID controller. As the results of testing the devices show, despite 

Design of Three-Phase Three-Switch Buck-Type Rectifier for Pre-Charging Application

2016 ◽  
Vol 7 (1) ◽  
pp. 124
Author(s):  
Anandh S ◽  
Vijayan S ◽  
Paramasivam Paramasivam
Keyword(s):  
Output Voltage ◽  
Design Procedure ◽  
Control Technique ◽  
Variable Frequency ◽  
Passive Components ◽  
Power Transistors ◽  
Three Phase ◽  
Variable Frequency Drives ◽  
And Control ◽  
Selection Of

The main objective of a pre-charging circuit in variable frequency drives is to pre-charge the DC-bus capacitor without any voltage and current overshoot within the specified time. In exisiting variable frequency drives seperte pre-charging circuits (or) thyristor bridges were used due to this drives power density, cost becomes high and control technique becomes complex.  This paper presents about the design of three-phase three-switch buck-type rectifier for pre-charging application used in variable frequency drives which elimates the disadvantages of existing techniques. In this paper we will discuss about design procedure of pre-charging circuit of an 800KW converter with dc-link output voltage of 775V at an input ac voltage of 550V, 60Hz, selection of power and passive components, voltage and current stress of power transistors. In the final this paper discusses about loss distribution of the components and comparison of new converter technique with existing pre-charging techniques.

scholarly journals $G$-deviations of polygons and their applications in Electric Power Engineering

2021 ◽  
Vol 55 (2) ◽  
pp. 188-200
Author(s):  
T. Banakh ◽  
O. Hryniv ◽  
V. Hudym
Keyword(s):  
Electric Power ◽  
Complex Plane ◽  
Metric Space ◽  
Power Engineering ◽  
Affine Transformations ◽  
Electric Power Engineering ◽  
Standard Characteristic ◽  
Three Phase ◽  
Measures Of Asymmetry

For any metric space $X$ endowed with the action of a group $G$, and two $n$-gons $\vec x=(x_1,\dots,x_n)\in X^n$ and $\vec y=(y_1,\dots,y_n)\in X^n$ in $X$, we introduce the $G$-deviation $d(G\vec x,\vec y\,)$ of $\vec x$ from $\vec y$ as the distance in $X^n$ from $\vec y$ to the $G$-orbit $G\vec x$ of $\vec x$ in the $n$-th power $X^n$ of $X$. For some groups $G$ of affine transformations of the complex plane, we deduce simple-to-apply formulas for calculating the $G$-deviation between $n$-gons on the complex plane. We apply these formulas for defining new measures of asymmetry of triangles. These new measures can be applied in Electric Power Engineering for evaluating the quality of 3-phase electric power. One of such measures, namely the affine deviation, is espressible via the unbalance degree, which is a standard characteristic of quality of three-phase electric power.

scholarly journals Modulation Variants in DC Circuits of Power Rectifier Systems with Improved Quality of Energy Conversion—Part I

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1876
Author(s):  
Tomasz Pajchrowski ◽  
Michał Krystkowiak ◽  
Dominik Matecki
Keyword(s):  
Quality Improvement ◽  
Energy Conversion ◽  
Electric Power ◽  
Power Electronics ◽  
High Power ◽  
Current Source ◽  
Supporting System ◽  
Three Phase ◽  
Power Rectifier

The article presents various concepts of three-phase power rectifiers with improved quality of converted electric power. This effect is obtained by modulating the currents in the DC output circuits of the rectifiers by means of power electronics controlled voltage or current sources, working as a so-called voltage or current modulators. For further quality improvement of the grid currents of the analyzed systems, it was proposed to use an additional controlled current source connected in parallel to the DC load, hereinafter referred to as a supporting system. The original elaborated method of controlling this source (supporting system) was presented. The main goal of the work was to propose a solution for an effective method of improving the quality of energy conversion in rectifier systems, especially high power ones, by using controlled current sources in DC circuits, operating as the power electronics current modulator and the supporting system.

MEDIATEXT IS A TOOL THAT DETERMINES THE QUALITY OF INFORMATION

2020 ◽  
Vol 6 (3) ◽  
pp. 158-164
Author(s):  
Navruza Yakhyayeva ◽  
Keyword(s):  
Functional Properties ◽  
Linguistic Features ◽  
Text Linguistics ◽  
Quality Of Information ◽  
The Creation ◽  
Linguistic Units ◽  
Scientific Classification

The quality and content of information in the article media text is based on scientific classification of linguistic features. The study of functional styles of speech, the identification of their linguistic signs, the discovery of the functional properties of linguistic units and their separation on the basis of linguistic facts is one of thetasks that modern linguistics is waiting for a solution. Text Linguistics, which deals with the creation, modeling of its structure and the study of the process of such activity, is of interest to journalists today as a science.

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