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Study of Flexible Interconnecting Mains Based on Transformer Frequency Converters


Author: Caloșin Danila
Degree:doctor of engineering
Speciality: 05.14.02 - Electrical power stations (electric parts), networks, electric power systems and their control
Year:2021
Scientific advisers: Vitalie Postolati
doctor habilitat, professor, Institute of Power Engineering of the ASM
Mihai Tîrşu
doctor, associate professor (docent), Institute of Power Engineering of the ASM
Institution: Technical University of Moldova

Status

The thesis was presented on the 9 September, 2021
Approved by NCAA on the 22 December, 2021

Abstract

Adobe PDF document – 2.70 Mb / in romanian
Adobe PDF document – 2.66 Mb / in english
Adobe PDF document – 2.78 Mb / in russian

Thesis

CZU 621.314.26(043)

Adobe PDF document 15.19 Mb / in russian
172 pages

Keywords

rotary frequency changer, asynchronous controlled intersystem connection, Interphase Power Controller (IPC), frequency transformation, multi-module frequency transformer, static transformer frequency converter

Summary

ABSTRACT The author – Danila Kaloshin. The title – Study of Flexible Interconnecting Mains Based on Transformer Frequency Converters. Dissertation for awarding the doctorate degree in technical sciences, speciality 221.01. Power systems and technologies. Structure of the work: the dissertation includes introduction; five chapters; conclusions and recommendations; references, which contain 137 source and 107 appendices; 169 pages of the main text; 6 tables and 100 figures; 6 scientific works are published based on the research results. Keywords: rotary frequency changer, asynchronous controlled intersystem connection, Interphase Power Controller (IPC), frequency transformation, multi-module frequency transformer, static transformer frequency converter. Field of study - technical sciences. Target of dissertation consists of the persuanсe of theoretic and calculation-experimental researches of the alternating current controlled interconnecting mains (AC CICM) based on the static transformer frequency converters. Dissertation tasks: include the development of mathematical models of the facilities based on constant current sources and static transformers with a circular transformation of the output voltage phase; elaboration of the electric schemes, as well as the laws of control by the operating modes of the facility types under consideration; study of the facilities in the stages of static and dynamic states; determination of expedience of the future studies in the development of the AC CICM based on static transformer frequency converters. Scientific novelty of the work: includes the mathematical models developed on the basis of the constant current sources and static transformers with a circular transformation of the output voltage phase; the electrical schemes of the facilities developed based on the constant current sources performed according to ‘zig-zag’ and ‘hexagon’ schemes; the laws of control by the operating modes of the facilities under study to organize the AC CICM. Scientific problem solved: as the result of the study performed, the possibility is shown to solve the scientific and engineering problems of organization the AC CICM based on the proposed schematic variants of the facilities. Theoretical importance. The research performed can serve as the basis for the deeper and more detailed study of the AC CICM using the static transformer frequency converters. Application relevance of the work: realization of static frequency transformers will make it possible to ensure a simpler, from the viewpoint of organization, the AC CICM without the application of an intermediate link of the DC transformation. Implementation of scientific results: the research results can be used in the process of theoretical and experimental studies, design and experimental works and technological engineering, as well as the development of the control devices and automated modes of operation for the devices of this kind.