The Analysis and Comparison of Leakage Inductance in Different Winding Arrangements for Planar Transformer Ziwei Ouyang, Ole C. Thomsen, Michael A. E. Andersen Department of Electrical Engineering, Technical University of Denmark

 

The Analysis and Comparison of Leakage Inductance in Different Winding Arrangements for Planar Transformer Ziwei Ouyang, Ole C. Thomsen, Michael A. E. Andersen Department of Electrical Engineering, Technical University of Denmark

 Abstract -- The coupling of the windings can be easily increased by using multiply stacked planar windings connection. Interleaving is a well-known technique used to reduce leakage inductance and minimize high-frequency winding losses. The paper aims to analyze leakage inductance based on magneto motive force (MMF) and energy distribution in planar transformer and correct the formula of leakage inductance proposed by previous publications. The investigation of different winding arrangements shows significant advantages of interleaving structure. In this work, a novel half turn structure is proposed to reduce leakage inductance further. Some important issues are presented to acquire desired leakage inductance. The design and modeling of 1 kW planar transformer is presented. In order to verify the analytical method for leakage inductance in this paper, finite element analysis (FEA) and measurement with impedance analyzer are presented. Good matching between calculation, FEA 2D simulation and measurement results is achieved.

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DESIGN AND DEVELOPMENT OF UPS FOR MARINE POWER SYSTEMS-V. Samsygin1, D. Sokolov, D. Ulitovsky, M. Sergeev, A. Martynov - TSNII SET Branch, Krylov State Research Centre, St. Petersburg, Russia 2 St. Petersburg University of Aerospace Engineering, Russia

DESIGN AND DEVELOPMENT OF UPS FOR MARINE POWER SYSTEMS 

Object and purpose of research. This paper discusses uninterruptable power supplies (UPS) developed by TSNII SET for marine power systems. The purpose of the study is to compare the results of UPS developments and outline the directions of their further improvement. For citation:Samsygin V.K., Sokolov D.V., Ulitovsky D.I., Sergeev M.Yu., Martynov A.A. Development and co- Building of uninterruptible power supplies for marine power supply systems. Proceedings of the Krylov State Research Center. 2019; 2(388): 101–111.

Труды Крыловского государственного научного центра. Т. 2, № 388. 2019

Transactions of the Krylov State Research Centre. Vol. 2, no. 388. 2019

VIEW ORIGINAL VERSION (RUSSIAN) : https://www.mediafire.com/file/934bv4jq5cxz95p/DESIGN+AND+DEVELOPMENT+OF+UPS+FOR+MARINE+POWER+SYSTEMS+.pdf/file

VERSION ENGLISH : https://www.mediafire.com/file/4cn5sqwca2qd0ht/UPS+FOR+MARINE+POWER+.pdf/file

WELDING INVERTER CONTROL FOR ELECTRIC WELDING OF HIGH-PRESSURE PIPES V.S. Savchuk A.S. Plekhov Nizhny Novgorod State Technical University n.a. R.E. Alekseev Nizhny Novgorod, Russia

 WELDING INVERTER CONTROL FOR ELECTRIC WELDING OF HIGH-PRESSURE PIPES 

V.S. Savchuk ORCID: 0000-0002-2281-6612 e-mail: vladsava1997@mail.ru Nizhny Novgorod State Technical University n.a. R.E. Alekseev Nizhny Novgorod, Russia A.S. Plekhov e-mail: aplehov@mail.ru Nizhny Novgorod State Technical University n.a. R.E. Alekseev Nizhny Novgorod, Russia 

 Abstract. The paper presents a development of control system for an electric arc welding installation based on the analysis of thermal processes and algorithms developed by the authors for controlling the operating modes of the power supply. Mathematical and simulation models of welding processes with control functions of pulsed welding modes are used. The electrothermal factors influencing the process of forming a weld are considered. A method for controlling the current pulses of the welding arc is proposed.

VIEW FULL PAPER: https://ie.nntu.ru/frontend/web/ngtu/files/nomera/2023/4(24)/043.pdf

CONTROL OF POWER CONVERTERS IN DC MICROGRIDS WITH RES E.S. Andreenkov Smolensk branch of «National Research University «MPEI» Smolensk, Russia УПРАВЛЕНИЕ СИЛОВЫМИ ПРЕОБРАЗОВАТЕЛЯМИ В МИКРОСЕТЯХ ПОСТОЯННОГО ТОКА С ВИЭ Е.С. Андреенков

 CONTROL OF POWER CONVERTERS IN DC MICROGRIDS WITH RES E.S. Andreenkov

 ORCID: 0000-0002-9928-5354 e-mail: root67@mail.ru Smolensk branch of «National Research University «MPEI» Smolensk, Russia 

 Abstract. The paper examines a distributed control system for power converters in a microgrid with a DC bus and the integrated use of renewable energy power sources. A comparative analysis of the main methods for implementing distributed control is provided. The concept of power and energy flow control is presented, within which the DC bus voltage is used as the only means of communication between the controlled components of the microgrid, and which allows for independent control of the operation of several sources, including renewable ones, in one microgrid, considering their priority. An algorithm that implements the presented five-state control concept is shown. Models and operating modes of power converters of sources and storage devices that implement the presented control concept are considered. To demonstrate the operation of the control algorithm based on the bus voltage level, simulation of a microgrid with a DC bus, three sources and a load was carried out in the Simulink (Matlab). In this case, a simplified model was used, which did not consider transient effects when switching converters, inductance, and capacitance of transmission lines. The results of modeling a microgrid with transitions between several operating states are presented. In each state, power balance and a stable voltage level are ensured, which confirms the performance of the proposed control strategy. The presented concept makes it possible to implement operating modes of sources depending on their priority, which is especially important for renewable energy sources, while several sources can operate in each state, and the use of a DC bus as a communication channel ensures maximum simplicity and reliability of the system.

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https://ie.nntu.ru/frontend/web/ngtu/files/nomera/2024/1(25)/004.pdf

CHARACTERIZATION OF MAGNETIC PERMEABILITY OF STEEL PLATES PACKAGE IN DIRECTION OF NORMAL MAGNETIC FLUX E.V. Kalinin e-mail: chernmaza@yandex.ru Nizhny Novgorod State Technical University n.a. R.E. Alekseev Nizhny Novgorod, Russia A.I. Chivenkov ORCID: 0000-0001-7578-8232 e-mail: chyvenkov@mail.ru Nizhny Novgorod State Technical University n.a. R.E. Alekseev Nizhny Novgorod, Russia

 CHARACTERIZATION OF MAGNETIC PERMEABILITY OF STEEL PLATES PACKAGE IN DIRECTION OF NORMAL MAGNETIC FLUX 

E.V. Kalinin e-mail: chernmaza@yandex.ru Nizhny Novgorod State Technical University n.a. R.E. Alekseev Nizhny Novgorod, Russia A.I. Chivenkov ORCID: 0000-0001-7578-8232 e-mail: chyvenkov@mail.ru Nizhny Novgorod State Technical University n.a. R.E. Alekseev Nizhny Novgorod, Russia

Abstract. The paper presents the possibilities of determining the magnetic permeability µn = µ0 ·µn' from the normal component of the magnetic flux Фn. It is necessary for 3D calculations of additional eddy current losses in laminated cores of high-power electric power devices. It is shown that it is unjustified to use the concepts of a layered magnetic circuit with a stacking factor Кз presented in well-known studies, when due to the asymptotic nature of the dependence µn(Кз), an inaccuracy in determining the Кз by 1% leads to a change in the value µn by 100% or more. An energy approach is proposed – through а specific eddy currents loss pe from the action of the flow Фn in packages of rectangular plates and analytical expressions linking µn with losses pe and the dynamics parameter ξ in conditions of a sharp skin effect. The relative permeability values µn' were determined using the wattmeter method at a frequency f = 50 Hz with an amplitude of magnetic induction Bm ≤ 0,1 T on samples of cold-rolled steels (40x80) mm: 08PS grade with thickness d = 0.91 mm without insulating coating and with non-magnetic gaskets of various thicknesses in the range of Kз = (0.9…1.0) – µn' ≥ (90…100); transformer steel grade 3406, d = 0.3mm coated (Kз = 0.96) – µn' ≥ 60.

VIEW FULL TEXT: https://ie.nntu.ru/frontend/web/ngtu/files/nomera/2024/2(26)/083.pdf