scholarly journals Modern Problems of Increasing Coal Mines Power Supply Efficiency

2019 ◽  
Vol 105 ◽  
pp. 03026 ◽  
Author(s):  
Fedor Nepsha ◽  
Roman Belyaevsky ◽  
Vladimir Efremenko ◽  
Kirill Varnavskiy
Keyword(s):  
Power Supply ◽  
Industry 4.0 ◽  
Electrical Power ◽  
Coal Mines ◽  
Coal Industry ◽  
Design Stage ◽  
Cyber Physical System ◽  
Electrical Power System ◽  
Rational Management ◽  
Modern Technologies

In this article, the authors consider the main problems of increasing the efficiency of coal mines electrical power system (EPS). The identified problems are divided into two groups: problems that can be solved at the design stage and problems that can be solved at the operation stage. Within each group, the authors consider various problems and propose possible solutions. It is noted that as a result of the solution of formulated problems it is possible to form the problem of developing an intelligent coal mines EPS. To solve this problem it is necessary to use modern technologies such as IoT (Internet of Things) and BIG DATA. In prospective it will allow to create a unified cyber-physical system uniting the virtual and real worlds within the framework of the coal mining technological process and ensuring the rational management of the coal mine EPS by the criterion of minimizing the energy consumption for extracting one ton of coal. As a conclusion, the authors note the necessity of solving the formulated problems for the implementation of the “Industry 4.0” concept, which has great importance for the Russian coal industry.

scholarly journals STATE STIMULATION OF TRANSFORMATION OF POWER INDUSTRY

2020 ◽  
Vol 10 (4) ◽  
pp. 320-329
Author(s):  
V. A. Zubakin
Keyword(s):  
Power Supply ◽  
Business Models ◽  
New Technologies ◽  
Electrical Power ◽  
General System ◽  
Pilot Project ◽  
Power Industry ◽  
Electrical Power System ◽  
Distributed Power ◽  
New Type

Transition to digital technologies in management of power industry at all levels – an inevitable consequence of the technical progress which has generated opportunities for diversification, decarbonization and decentralization. Thus it is necessary to recognize that digitalization in power industry is NOT automation, and first of all creation of new business models, services and the markets with a support on possibility of digital economy. In this article questions of transformation of architecture of power industry, and also the main restrictions are considered: absence in regulatory base of new opportunities for consumers; general system inefficiency; impossibility “to legalize” appearance of new subjects (active consumers and prosumers, operators of micropower supply systems and aggregators of the distributed power objects, various service organizations), and also to deregulate the relations between them, to standardize interaction interfaces with EEC, to transform the energy markets.In article it is offered for transition to new digital power to make corresponding changes to the legislation: to enter new type of participants of the market (the active consumer, an active power complex), operated intellectual connection carrying out the standard with the electrical power system, completely responsible for management of the power supply and thus having the minimum regulatory restrictions on organizational model of the work; to improve rules of functioning of trade systems for creation of the markets of the distributed power providing an effective exchange of goods and services between traditional participants of the markets and participants of new type; to enter possibility of application of technologies of the coordinated management of the distributed sources and consumers of energy, systems of storage of energy, means of regulation of loading (“aggregators”) for the purpose of increase of efficiency of their use and participation in the electric power and power markets, including rendering system services and performance of other functions in these markets (the pilot project of such system is realized under the leadership of the author of the present article by subsidiary PAO “Lukoil” “Energy and gas of Romania”); to increase technological and economic flexibility of conditions on reliability and quality of power supply, creation of possibility of a choice by the consumer of conditions of power supply necessary for him and the account them in cost; to enter the accounting of the opportunities given by “new” decisions, at an assessment, formation and implementation of investment programs of the adjustable companies (including introduction of a technique of an assessment of investment projects at possession cost on all life cycle of the decision); to replace cross subsidizing of the population by industrial consumers with mechanisms of address social support and / or with system of restriction of volumes of consumption on reduced rates (“соцнорма”); to refuse further deployment of system of subsidizing of power supply of one regions at the expense of consumers of other regions (as it leads to growth of inefficient power consumption in the subsidized regions, not provided with available generation and infrastructure); to change norms of technical regulation, norms of design on the basis of new technologies; to make changes to programs of development of the infrastructure organizations of power industry taking into account trends of diversification, decentralization, decarbonization and a digitalization; to provide possibility of stimulation, including tariff, implementation of regional programs (pilot and regular), aimed at the complex development of power industry on the basis of new approaches, technologies and the practician, and also the hi-tech companies of small and medium business providing development.

Research on Synthesis Control Technology for Aircraft Electrical System

2012 ◽  
Vol 203 ◽  
pp. 202-206
Author(s):  
Hang Xu ◽  
Tao Zou
Keyword(s):  
Control System ◽  
Power Supply ◽  
Power Supply System ◽  
Fault Tolerant ◽  
Electrical Power ◽  
Supply System ◽  
Electromechanical System ◽  
Electrical System ◽  
Electrical Power System ◽  
Aircraft Flight

The airborne electromechanical system is essential to ensure the aircraft flight and it is most complex system in the aircraft, the aircraft intelligent power supply system and the aircraft electrical system synthesis control is the basis of airborne integrated electromechanical system. The paper gives up the hardware and software compositions and operation features of the aircraft electrical synthesis control system under based on the current situation of science and technology. It expounds the function and structure of PSP, ELMC and RT, the demands of BIT technique and fault tolerant design of electrical power system. It refers design scheme of electrical synthesis control system according to developing trends of aircraft electrical system.

Development of China's Electrical Power System

1989 ◽  
Vol 7 (5) ◽  
pp. 328-336
Author(s):  
David Denny
Keyword(s):  
Power System ◽  
Electric Power ◽  
Power Supply ◽  
Electrical Power ◽  
Foreign Technology ◽  
Industrial Output ◽  
Electrical Power System ◽  
Transmission Networks ◽  
Electric Power Supply ◽  
Output Only

The downtrend in electrical output, 10-14% 1977-79 to 6% 1979-84, was reversed to 7.4% between 1980 and 1987 when 35,000 Mw of capacity was added, transmission networks were expanded and regional grids linked. Part of this success arose from policies that replaced a monolithic system of bureaucratic planning to involvement of local interests and decentralization. Chinese organizations have also been able to take advantage of foreign technology and investment. Nevertheless, industrial output only reached 75-80% of its potential due to inadequate electric power supply.

Degraded Power Supplies

2016 ◽  
Author(s):  
Maja Lundbäck ◽  
Mattias Karlsson
Keyword(s):  
Power System ◽  
Power Supply ◽  
Nuclear Power ◽  
Electrical Power ◽  
Power Supplies ◽  
Operational Experience ◽  
Electrical Power System ◽  
Best Available Technology ◽  
Available Technology ◽  
Safety Systems

The electrical disturbance in Forsmark 2006 [3] led to increased attention being paid to the power supplies of nuclear power plants and their role in safety system reliability, both nationally and internationally. Since then numerous disturbances similar in nature have occurred in the electrical power supply which raises questions whether best available technology (BAT) has been utilised in the design and analysis of the electrical power supply of the safety functions of nuclear facilities. On repeated occasions this type of disturbances has had an impact on redundant parts of several safety systems due to functional dependencies between these. The frequency of these occurrences has been unexpected. The Swedish Radiation Safety Authority (SSM) has decided to write this document to clarify the regulators position on this issue. The document is also intended to support SSM:s assessments and evaluations of the Licensees efforts regarding degraded power supplies. An assessment of nuclear power plant electrical power systems is necessary in the light of the past years’ operational experience [1–7], where disturbances in the electrical power supply on repeated occasions have caused a power supply with degradation severe enough to challenge plant safety. As the potential consequences of such a degraded power supply can be severe it must be proven that the frequency of such occurrences is tolerably low. Furthermore, it is important to consider experiences from known situations with degraded power supplies, to enable a reasonable approach to identify and take counter-measures based on the root-cause and ensure utilisation of best available technology. A sufficient approach to enable prevention, protection and mitigation against this type of disturbances has been difficult to identify. Actual events and conditions causing a degraded power supply have often been complex in nature and difficult to anticipate, wherefore events and conditions which has not yet occurred are difficult to foresee. For this reason it is deemed most effective to identify and implement proportional measures that enhances the independence of the power supplies, such that a degraded power supply with a higher reliability is prevented from propagating to multiple parts of the safety systems. In this memorandum, SSM describes a state-based approach to analysing electrical power system functionality in different states of degraded power supply. The approach is intended to identify potential design weaknesses and measures to enhance robustness. Such an approach is viewed as more favourable in facilitating the identification of such measures, which may otherwise be neglected due to an estimated low frequency of occurrence, or missed due to incomplete identification of possible events and conditions. Furthermore this document describes how an assessment of electrical power system design can be performed, where the lowest common denominator from operational experience e.g. [1–7] is identified and counteracted. Actual occurrences of degraded power supplies, which all have been “unknown during the event identification process” but “well-known electrical phenomena”, can be described as unidentified degrading conductive disturbances.

Vehicle Electrical Power Supply Systems and Their Impact on System Design

1992 ◽  
Vol 206 (3) ◽  
pp. 149-159 ◽  
Author(s):  
G A Williams ◽  
M J Holt
Keyword(s):  
Control Systems ◽  
Power Supply ◽  
Electrical Power ◽  
Critical Systems ◽  
Electrical Power System ◽  
Electrically Actuated ◽  
Electrical Demand ◽  
Electrical Power Consumption ◽  
Systems View ◽  
Supply Systems

The electrical power system is the vital lifeline to most of the control systems on modern automobiles. The following general trends are observed. (a) increased use of electrically actuated systems, (b) increased use of electronic control, (c) increasing requirements for high-integrity power supplies for safety critical systems, (d) increased average electrical power consumption (heating, actuation, control systems), (e) increased electrical demand at engine idle combined with reducing idling speeds, (f) increased interest in higher voltage systems, (g) electrical system problems a major cause of roadside breakdowns. These trends clearly indicate major changes in the requirements of vehicle electrical power supply systems and will demand considerable activity from the vehicle industry in the next decade. An important aim of this paper is to illustrate and promote a systems view of electrical power while considering existing and future problems and opportunities.

scholarly journals Contributions of Petri Nets to the Reliability and Availability of an Electrical Power System in a Big European Hospital - A Case Study

2021 ◽  
Vol 16 ◽  
pp. 21-42
Author(s):  
Constâncio António Pinto ◽  
José Torres Farinha ◽  
Sarbjeet Singh
Keyword(s):  
Power System ◽  
Petri Nets ◽  
Power Supply ◽  
Block Diagram ◽  
Electrical Power ◽  
Dynamic Modelling ◽  
Electric Power System ◽  
Stochastic Petri Nets ◽  
Electrical Power System

The energy power supply infrastructure of a hospital, to function correctly, needs to be well maintained to ensure its reliability and, by consequence, the maximum integrated availability. In this paper, the authors propose the use of Petri Nets to help the improvement of the electric power system reliability, having as a case study a big European Hospital. The purpose of the research is to identify and analyse the potential failures of the system and to suggest solutions to improve the operations and maintenance to maximise the availability and reliability of those assets through possible and objective answers. It was necessary to develop a diagnosis and planning methodology to assess the reliability of several components of the energy power supply system. It is dynamic modelling based on a block diagram of the system and transposed to representation by Petri Nets. The analysis and the simulation of the discrete events of the system, as well as the visualisation of the process functioning and the communications inside, was made. Additionally, they were referred to other approaches, like the Fuzzy Petri Nets and Stochastic Petri Nets, as well as a future balance about its application in a situation like the analysed in this paper

scholarly journals Research on High Reliability Power Supply Design Scheme of Nuclear Power Plant

2019 ◽  
Vol 115 ◽  
pp. 02002
Author(s):  
Wang Geng
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Power System ◽  
Power Supply ◽  
Nuclear Power ◽  
High Reliability ◽  
Electrical Power ◽  
Basic Structure ◽  
Electrical System ◽  
Electrical Power System

After the Fukushima nuclear accident, the reliability requirements for Nuclear Power Plant (NPP) safety systems have been further improved worldwide. Therefore, it is necessary to provide a safe, reliable and economical scheme of the power supply system to cope with the abnormal conditions. Based on the reliability of the power supply of the 3rd generations of NPPs and combined with the application of the defend in depth concept in the electrical system, this paper provides a brief introduction of the typical 3rd generation NPP electrical system in the following area: the configuration of the electrical power system, defence in depth principle of the power supply, the basic structure of electrical power system. On this basis, an optimal power supply scheme is proposed.

scholarly journals Optimalisasi Koordinasi Relay Arus Lebih Kapal Bulk Carrier 50.000 DWT(Dead Weight Ton) Menggunakan Metode Genetic Algorithm

CYCLOTRON ◽  
2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Rahim Atmanegara ◽  
Istiyo Winarno ◽  
Iradiratu DPK ◽  
Daeng Rahmatullah
Keyword(s):  
Genetic Algorithm ◽  
Power System ◽  
Power Supply ◽  
Electrical Power ◽  
Bulk Carrier ◽  
Electrical Power System ◽  
Dead Weight ◽  
Relay Coordination ◽  
Overcurrent Relay ◽  
Genetic Algorithm Method

Abstrak— Koordinasi sistem pengaman sangat diperlukan dalam mengatasi gangguan yang terjadi pada sistem tenaga listrik, sehingga gangguan-gangguan yang terjadi dapat diatasi dari sistem yang sedang berjalan. Begitu juga dengan keamanan pada sistem kelistrikan pada Kapal Bulk Carrier 50.000 DWT (Dead weight Ton) dibutuhkan koordinasi sistem pengamanan yang tepat. Dengan mengaplikasikan prinsip koordinasi relay, maka urutan kerja peralatan pengaman sepanjang saluran dari sumber sampai pada beban harus diperhatikan. Koordinasi relay ini mencakup dari main switch board power supply sampai distribusi panel (pembebanan) dan perhitungan yang di ambil mulai dari kabel, relay, kapasitas relay, dan pembebanan dimulai dari main switch board sampai ke beban. Setelah dilakukan perhitungan yang tepat selanjutnya  peneliti menggunakan metode Genetic Algorithm untuk mengoptimalkan koordinasi relay arus lebih tersebut. Dengan metode Genetic Algorithm didapatkan nilai setting TMS (Time Multiplier Setting) pada relay 1 = 0,9 s, T = 1,76 s, Ip = 162,14 A, I set Pickup = 0,23 A, I set Definite = 1,1 A, pada relay 2 Tms = 1,1 s, T = 1,69 s, Ip = 130,57 A, I set Pickup = 2,9 A, I set Definite = 16,86 A, pada relay 3 Tms = 0,31 s, T = 0,39 s, Ip = 109,25 A, I set Pickup = 2,42 A, I set Definite = 16,61 A. Adapun software yang digunakan adalah Matlab (R2009b) dan ETAP 12. Dengan menambahkan metode tersebut pada penelitian ini, diharapkan koordinasi relay arus lebih akan menjadi lebih optimal.Kata kunci: relay arus lebih, Genetic Algorithm, koordinasi relayAbstract— Security system coordination is very important to solve any trouble in electrical power system, That’s trouble can be solved from the system have been working, So That’s why to security electrical power system in Bulk Carrier ship with 50.000 Dead Weight Ton must be requiring a good coordination security system appropriate. By applying principle relay coordination, so the work step which of security equipment channels from the source until electrical load must be controlled. The relay Coordination is include from main switch board power supply until distribution panel and It’s  need calculation from wire,  relay, relay capacity, and the loading have took from main switch board until load. Researcher will be using genetic algorithm method after all Calculation has been done which for optimization overcurrent relay coordination. By using Genetic Algorithm method be obtained value of TMS (Time multiplier Setting) in relay 1= 0,9 s, T = 1,76 s, Ip = 162,14 A, I set Pickup = 0,23 A, I set Definite = 1,1 A, and in the Relay 2 Tms = 1,1 s, T = 1,69 s, Ip = 130,57 A, I set Pickup = 2,9 A, I set Definite = 16,86 A, in relay 3 Tms = 0,31 s, T = 0,39 s, Ip = 109,25 A, I set Pickup = 2,42 A, I set Definite = 16,61 A. The software will be used in this research is Mathlab R2009B software and Electrical Transient Analyzer Program. By using that’s method it might the relay coordination will be optimal.Keywords: Overcurrent Relay, Genetic Algorithm (GA), Relay Coordination

scholarly journals Modeling and Simulation of Variable Speed Variable Frequency Electrical Power System in More Electric Aircraft

2017 ◽  
Vol 11 (1) ◽  
pp. 87-98 ◽  
Author(s):  
Kelu Xu ◽  
Ning Xie ◽  
Chengmin Wang ◽  
Xudong Shi
Keyword(s):  
Power System ◽  
Power Supply ◽  
Electrical Power ◽  
Power Source ◽  
Variable Frequency ◽  
Change Strategies ◽  
Variable Speed ◽  
Electrical Power System ◽  
Electric Aircraft ◽  
More Electric Aircraft

The More Electric Aircraft (MEA), Variable Speed Variable Frequency (VSVF) and Electrical Power System (EPS) has lager generating capacity and higher energy efficiency than the conventional Constant Speed Constant Frequency EPS, but the generators of MEA have to working as redundant power supplies to improve the power supply reliability, instead of parallel power supply. To study the steady state operation and power source change strategies under different fault conditions of VSVF EPS, the integrated structure of VSVF EPS is firstly illustrated and operating principles of components are theorized. The key components including variable frequency generators, Bus Power Control Unit, rectifiers and other supplementary elements are then simulated to build a comprehensive VSVF EPS model on the platform of Simulink and the power source change strategies are realized by logic units. Finally, the stability analysis in terms of normal operation is carried out in case studies and power source exchange strategies in different situations are summarized. The results show that the model proposed by the paper can be used to simulate MEA VSVF EPS and analyze its whole operational process effectively and efficiently.

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