scholarly journals Waveguide microwave filters technical solutions, development trends and calculation methods.

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
V.V. Komarov ◽  
◽  
M.A. Lukyanov ◽  
Keyword(s):  
Power Systems ◽  
Microwave Filters ◽  
Dielectric Substrates ◽  
Planar Structures ◽  
Methods Of Calculation ◽  
Time Diversity ◽  
Waveguide Filters ◽  
Electromagnetic Signals ◽  
Technical Solutions ◽  
Separate Class

Various frequency selective devices manufactured by different technologies are used in modern microwave systems to filtering electromagnetic signals. Planar structures on dielectric substrates find a wide spread in low- and average-level (less than 100 W) power systems. Microwave filters on cavities and waveguides are utilized in high-power systems for these purposes. Waveguide filters are the separate class of perspective functional devices dynamically developing in the present time. Diversity of designs of such filters, techniques of their manufacturing and methods of calculation is quite high. In conjunction with this a review of waveguide microwave filters of different frequency ranges is carried out in the present work. Their classification is proposed. It is shown that waveguide filters are well adapted for operating at different frequencies both in microwave and terahertz ranges. Structures of filters, some methods of their manufacturing and mathematical modeling are analyzed.

Microwave filters on cavity resonators

2021 ◽  
Author(s):  
V.V. Komarov ◽  
S.K. Bushanskiy ◽  
A.O. Churkin
Keyword(s):  
High Power ◽  
Electromagnetic Waves ◽  
Complex Shape ◽  
Microwave Filters ◽  
Electronic Systems ◽  
Microwave Range ◽  
Cavity Resonators ◽  
Electromagnetic Characteristics ◽  
Technical Solutions

Waveguide and cavity microwave filters continue to be the most important components of high-power radio electronic systems. Cavity microwave filters are of great interest as a separate group of devices of this type. The fields of application of such filters are constantly expanding, and the variety of their design is quite large. In addition, the requirements for their electromagnetic characteristics and reliability are currently increasing. In this regard, it becomes necessary to analyze the already created designs of these devices and study the main trends of their improvement. The objective of the present study is to review the known technical solutions of bandpass filters, made on cavity resonators of the microwave range. An overview of the designs of devices for filtering electromagnetic waves on cavity resonators with coaxial and waveguide coupling elements of various frequency ranges is carried out. It is proposed to use the configuration of basic resonators as the main criterion for the classification of these devices. In accordance with this criterion, five groups of filters are considered: on rectangular, cylindrical, spherical, coaxial resonators, as well as on resonators of complex shape. The review makes it possible to analyze the features of the implementation of different technical solutions for bandpass microwave filters of medium and high power levels and to identify the main trends in the development of this area of research.

PERSPECTIVE DIRECTIONS FOR THE IMPROVEMENT OF ENERGYOPTIMAL PARAMETERS AND TRACTION PROPERTIES OF THE LOCOMOTIVE

2017 ◽  
pp. 161-173
Author(s):  
Nikolay Mikhalchuk
Keyword(s):  
Control System ◽  
Solid State ◽  
Power Systems ◽  
Power Control ◽  
Control Systems ◽  
Control Parameter ◽  
Practical Importance ◽  
Electric Energy ◽  
Rolling Stock ◽  
Technical Solutions

Objective: To develop and justify energy-efficient and energy-saving control technology of traction electric drive with maximum realization of traction properties. Methods: Mathematical modeling, experimental manufacturing of prototypes of the converters and control system. Results: Theoretical justification was presented, based on refinement of the theory of energy processes in electrical circuits with solid state power controllers. It was proposed to apply electrical resistance of elements in electric power systems as a power control parameter instead of the conventional voltage. It was revealed that, in contrast to the existing analogues, semiconductor power regulators of different application with a new control parameter acquire the property of the electric variator. Technical solutions for manufacturing an innovative traction electric rolling stock were introduced with the use of advanced technical solutions of power control with adaptive control system that provides improved traction properties without shortening irreversible transformation of electric energy of power semiconductor devices. As an example, the solutions involving artificial intelligence in control systems of complex technical systems were presented, based on graphics processors, neural networks, providing parallel processing of large information arrays. Practical importance: Introduction of electric solid state variable speed with adaptive, intelligent control systems will significantly raise energy efficiency and improve the implementation of traction parameters of the locomotive.

Current Issues in Human Factors Regulation for UK Nuclear Power Systems

2000 ◽  
Vol 44 (22) ◽  
pp. 799-802
Author(s):  
Jeremy C. Williams
Keyword(s):  
Power Systems ◽  
Human Factors ◽  
Continuous Improvement ◽  
Nuclear Power ◽  
Nuclear Plant ◽  
Design Management ◽  
Regulatory Status ◽  
Technical Solutions

This paper describes the current regulatory status of human factors technology as applied to the design, management, assessment, inspection, operation and decommissioning of nuclear plant in the U.K. It addresses the outstanding issues, reviews the technical solutions that are available, outlines the research that has been undertaken and explores the standards and processes that are required to maintain the impetus for continuous improvement.

scholarly journals Investigation of Band-Pass Filters of K-Range on Rectangular Concentric Resonators

2020 ◽  
Vol 23 (1) ◽  
pp. 63-69
Author(s):  
V. V. Komarov ◽  
S. K. Bushanskiy
Keyword(s):  
Finite Element ◽  
Spectral Characteristics ◽  
Microwave Filters ◽  
Basic Unit ◽  
Microwave Range ◽  
Element Analysis ◽  
Cavity Resonators ◽  
Microwave Engineering ◽  
New Type ◽  
Electromagnetic Signals

Introduction. Simple-shaped cavity resonators: rectangular, cylindrical and coaxial, are widely applied in modern microwave engineering in design of different functional devices of middle and high power levels. Parameters of resonators can be obtained analytically by using expressions from literature. Concentric resonators, performed on the basis of classical simple-shaped cavities with a central metallic core represent a new class of electrodynamic systems of microwave range, the properties of which remain poorly studied. One of these structures, named a rectangular concentric resonator (RCR) is proposed in the paper as a basic unit of K-band bandpass filters (18...26 GHz).Aim. To study potential possibilities of RCR for creation electromagnetic signals filtration devices of micro wave range.Materials and methods. The finite element method implemented in the package COMSOL was used to investigate electrodynamic characteristics of RCR and scattering matrix parameters of the microwave filters on RCR basis.Results. Simple polynomial expressions for computation of normalized resonant wavelengths of RCR were obtained at the first stage of modeling. Next, two models of passband microwave filters by RCR with different sizes were built and their EM characteristics were studied. Cavities sizes were determined numerically and practical recommendations on the realization of a new type bandpass microwave filters were formulated.Conclusion. New results of the finite-element analysis of spectral characteristics of two models of bandpass Krange filters on rectangular concentric resonators were represented. The advantages of the filters were indicated. Simple analytical expressions for calculation of the resonance wavelengths of the considered concentric resonators were obtained.

scholarly journals Structural and parametric synthesis of anti-average control algorithms for realizing adaptive frequency operating automaticselectrotechnical systems

2019 ◽  
Vol 21 (4) ◽  
pp. 66-76 ◽  
Author(s):  
V. R. Ivanovа ◽  
I. Y. Ivanov ◽  
V. V. Novokreshchenov
Keyword(s):  
Power Plant ◽  
Power Systems ◽  
Electrical Network ◽  
Control Algorithms ◽  
Parametric Synthesis ◽  
Discrete Signals ◽  
Start Up ◽  
Average Control ◽  
Algorithmic Model ◽  
Technical Solutions

In the event of accidents in power systems associated with a reduction in frequency in order to prevent the complete repayment of the energy district and accelerate the elimination of the accident, frequency division automatics (FDA) are used. Existing technical solutions for the implementation of the FDA do not always provide a balance of the generated and consumed power under the action of the FDA, since the current circuit-mode situation is not taken into account. The aim of this work is to develop effective algorithms for the functioning of adaptive FDA, which allocates power units of a power plant to a balanced load of an isolated energy district, taking into account the current circuit-mode situation. To achieve this goal, we use the method of structural and parametric synthesis of emergency control algorithms, which consists in creating a composite algorithmic model of adaptive FDA. The result of this work is the developed algorithmic model of an adaptive FDA of a power plant, consisting of input and processing algorithms for input analog signals of a FDA, algorithms for input and processing of input discrete signals of a FDA, algorithms for generating start-up organs of a FDA, algorithms for allocating a power plant to a balanced load of a power district. The proposed algorithm for the functioning of adaptive FDA is universal and allows you to automatically allocate power units of a power plant to a balanced load of an isolated energy district, regardless of the type of accident and its cause, the configuration of the electrical network and the values of electricity generation and consumption, as well as the current circuit-mode situation.

scholarly journals Underfrequency Load Shedding: An Innovative Algorithm Based on Fuzzy Logic

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1456 ◽  
Author(s):  
Robert Małkowski ◽  
Janusz Nieznański
Keyword(s):  
Fuzzy Logic ◽  
Power Systems ◽  
Load Shedding ◽  
Test Results ◽  
Fixed Frequency ◽  
Time Data ◽  
The World ◽  
Adaptive Thresholds ◽  
The Subject ◽  
Technical Solutions

In contemporary power systems, the load shedding schemes are typically based on disconnecting a pre-specified amount of load after the frequency drops below a predetermined value. The actual conditions at the time of disturbance may largely differ from the assumptions, which can lead to non-optimal or ineffective operation of the load shedding scheme. For many years, increasing the effectiveness of the underfrequency load shedding (UFLS) schemes has been the subject of research around the world. Unfortunately, the proposed solutions often require costly technical resources and/or large amounts of real-time data monitoring. This paper puts forth an UFLS scheme characterized by increased effectiveness in the case of large disturbances and reduced disconnected power in the case of small and medium disturbances compared to the conventional load-shedding solutions. These advantages are achieved by replacing time-consuming consecutive load dropping with the simultaneous load dropping mechanism and by replacing ineffective fixed-frequency activation thresholds independent of the state of the system with implicit adaptive thresholds based on fuzzy logic computations. The proposed algorithm does not require complex and costly technical solutions. The performance of the proposed scheme was validated using multivariate computer simulations. Selected test results are included in this paper.

scholarly journals The Application of Molten Salt Energy Storage to Advance the Transition from Coal to Green Energy Power Systems

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2222 ◽  
Author(s):  
Wojciech Kosman ◽  
Andrzej Rusin
Keyword(s):  
Energy Storage ◽  
Power Systems ◽  
Molten Salt ◽  
Power Grid ◽  
Renewable Energy Sources ◽  
Green Energy ◽  
Operating Conditions ◽  
Energy Sources ◽  
Steam Turbines ◽  
Technical Solutions

The paper presents technical solutions for a power grid that undergoes the elimination of a significant number of coal-based power generating units. The purpose of the solutions is to adapt the existing machines with sufficient lifespans to the new operating conditions. In particular these include steam turbines. The steam turbines’ cycles may be extended with energy storage systems based on a molten salt. This allows to increase the flexibility of the power generating units while maintaining the largest possible efficiency of the power generation. The solutions presented here allow to connect the steam turbines cycles to renewable energy sources and reduce the overall number of the units that create the fundamental layer of the power grid. The analysis of the solutions involves numerical modeling. The paper describes the assumptions and the results of the modeling for chosen cases of the modernization. The researched considered a number of options that differed in the investment costs and the resulting performance.

scholarly journals Correction of manufacturing deviations in waveguide filters and manifold multiplexers using metal insertions

2015 ◽  
Vol 7 (3-4) ◽  
pp. 219-227 ◽  
Author(s):  
Santiago Cogollos ◽  
Carlos Carceller ◽  
Mariam Taroncher ◽  
Vicente E. Boria ◽  
Marco Guglielmi ◽  
...  
Keyword(s):  
High Power ◽  
Circular Waveguide ◽  
Microwave Filters ◽  
Mapping Technique ◽  
Alternative Technique ◽  
Dual Mode ◽  
Space Applications ◽  
Small Deviations ◽  
Radiation Losses ◽  
Waveguide Filters

Microwave filters and multiplexers commonly employ tuning screws to compensate for small errors occurring during the fabrication process. Nevertheless, the use of tuning screws has some disadvantages, because the small gaps between the screws and the holes are prone to create unwanted effects when dealing with high-power signals, especially for space applications, and are also the source of potential radiation losses. In this paper, an alternative technique to correct manufacturing deviations is presented, in which tuning screws are replaced by fixed metal insertions. In this case, the correction is made by means of designing new insertion pieces that will be able to correct those small deviations. In order to find the dimensions of the new pieces, a space-mapping technique is applied. For verification purposes, the method has been applied over a circular-waveguide dual-mode filter and later over a manifold multiplexer containing the same type of filters. However, the technique can be directly extended to other types of waveguide filters and multiplexers where tuning screws are also employed.

scholarly journals Development, features and prospects of application of AMP / cold ironing marine power systems

2021 ◽  
Vol 2061 (1) ◽  
pp. 012007
Author(s):  
A V Ignatenko ◽  
D V Migel ◽  
G V Deruzhinsky ◽  
N A Kravchenko
Keyword(s):  
Power Systems ◽  
Environmental Impacts ◽  
High Voltage ◽  
Development Trends ◽  
Current State ◽  
Cargo Capacity ◽  
Alternative Power ◽  
Technical Solutions ◽  
Port Infrastructure ◽  
Prospects Of Application

Abstract The evolution and current state of the technology for supplying ships from the shore under high voltage - alternative power from the shore (APS), known as “Alternative Maritime Power® (AMP®), cold ironing (CI) and high voltage shore connection (HVSC) are described. The structure of the system and existing methods of implementation, mandatory components, depending on the system version are considered. The need for national adaptations of the international versons, the unification of existing technical solutions and their development trends, taking into account high-voltage technologies is emphasized. Advantages and challenges of environmental impacts, expected phased tightening of environmental regulations, including the maritime legislation (the MARPOL convention), as well as promising initiatives in the context of global decarbonization trends are described. The need to take into account purposes and cargo capacity and regions of operation of ships, to develop the port infrastructure, and make clean electricity available is emphasized.

Sign in / Sign up

Export Citation Format

Share Document