Energies

Research

21 pages, 4967 KiB

Open AccessArticle

Modified Permanent Magnet Synchronous Generators for Using in Energy Supply System for Autonomous Consumer

by Denis Kotin, Ilya Ivanov and Sofya Shtukkert

Energies 2021, 14(21), 7196; https://doi.org/10.3390/en14217196 - 2 Nov 2021

Cited by 2 | Viewed by 1989

In this paper, the possibility of using synchronous generators with magnetoelectric excitation for the autonomous consumers’ supply with the use of renewable energy sources is considered. To eliminate a number of the disadvantages associated with the difficulty of energy-efficient regulation of the generated [...] Read more.

In this paper, the possibility of using synchronous generators with magnetoelectric excitation for the autonomous consumers’ supply with the use of renewable energy sources is considered. To eliminate a number of the disadvantages associated with the difficulty of energy-efficient regulation of the generated parameters, such as the generated current and voltage, the use of modified multi-winding synchronous generators with permanent magnets is proposed. It allows solving the problem of controlling this type of generator. In addition, the use of this type of generator helps to increase the amount of energy generated. The authors have proposed several synchronous generators with permanent magnets of various supply network architectures: single-phase, two-phase and traditional three-phase types. This will simplify the design of architecture for several cases of consumer power supply systems. It will also help to eliminate the need to organize a balanced distribution of loads in phases to prevent accidents, damage and/or disabling of consumers themselves. Here, we considered mathematical descriptions of several types of generators that differ in their assembling, in particular, the number of phases (one-, two- and three-phase generators), the number of pairs of permanent magnet poles on the rotor, and the method of switching the generator windings among themselves. Using the developed mathematical descriptions that describe the operation of every single winding of the generator, their mathematical models were developed in the SimInTech mathematical modeling environment. The results of the mathematical modeling of these generators were presented; their interpretation for use with renewable energy sources was made; and the methods of using these generators were described. The developed mathematical descriptions of synchronous generators with permanent magnets can be used for further study of their operation. It can also help for the development of control systems and power systems for micro-grid energy complexes that use renewable energy sources to increase the energy efficiency of micro-grid systems. Full article

(This article belongs to the Special Issue Frontiers in Power Electronics and Drive Systems)

► Show Figures

Figure 1

16 pages, 3923 KiB

Open AccessArticle

Non-Contact Methods for High-Voltage Insulation Equipment Diagnosis during Operation

by Dmitry A. Ivanov, Marat F. Sadykov, Danil A. Yaroslavsky, Aleksandr V. Golenishchev-Kutuzov and Tatyana G. Galieva

Energies 2021, 14(18), 5670; https://doi.org/10.3390/en14185670 - 9 Sep 2021

Cited by 8 | Viewed by 2701

Abstract

The article describes a complex of non-contact methods for remote diagnosis of high-voltage insulators as well as the two-channel method for remote diagnostics of the operating state of high-voltage insulators, based on the registration of partial discharges by electromagnetic and acoustic sensors. The [...] Read more.

The article describes a complex of non-contact methods for remote diagnosis of high-voltage insulators as well as the two-channel method for remote diagnostics of the operating state of high-voltage insulators, based on the registration of partial discharges by electromagnetic and acoustic sensors. The presented device allows visual inspection and searches for faulty high-voltage equipment and a remote non-contact method of recording high-intensity electric fields of industrial frequency and their spatial distribution based on the electro-optical effect. The scheme of using the system for monitoring and diagnosing the technical condition of high-voltage support insulators of open switchgear is described. The results of experimental studies confirm the possibility of industrial applicability of the proposed method for non-contact remote diagnostics of the state of high-voltage insulators under operating voltage. Full article

(This article belongs to the Special Issue Frontiers in Power Electronics and Drive Systems)

► Show Figures

Figure 1

15 pages, 3261 KiB

Open AccessArticle

On the Physical Nature of Frequency Control Problems of Induction Motor Drives

by Kodkin Vladimir and Anikin Alexander

Energies 2021, 14(14), 4246; https://doi.org/10.3390/en14144246 - 14 Jul 2021

Cited by 13 | Viewed by 2731

Abstract

This article considers the possibility of connecting the problems of the engineering synthesis of frequency control systems for induction motor drives (IMD) with the theory of the identification of IMD based on the equations of a generalized AC electric machine. The article presents [...] Read more.

This article considers the possibility of connecting the problems of the engineering synthesis of frequency control systems for induction motor drives (IMD) with the theory of the identification of IMD based on the equations of a generalized AC electric machine. The article presents experimental studies of load parrying in IMD with vector (VC) and scalar (SC) controls. These results indicate the absence of fundamental advantages in a drive with VC. This advantage should manifest in a more efficient formation of the moment and fast transients. A method was proposed for describing IMD by nonlinear transfer functions, making it possible to formulate the principle of the correction of IMD and a method for assessing their efficiency. The article shows that the correction based on the proposed nonlinear transfer functions of the induction motor is much more efficient than the traditional VC, which was confirmed by detailed experiments and modeling. The most important results are given in the article. An assumption was made that the efficiency advantage was due to more accurate identification of the dynamics of an IMD with a gear function instead of vector equations. Full article

(This article belongs to the Special Issue Frontiers in Power Electronics and Drive Systems)

► Show Figures

Figure 1

Journal Menu

Journal Browser

Frontiers in Power Electronics and Drive Systems

Share This Special Issue

Special Issue Editors

Special Issue Information

Keywords

Published Papers (3 papers)

Research

Further Information

Guidelines

MDPI Initiatives

Follow MDPI