Simulation of the Operation of an Autonomous Hybrid Electrical Power System for Decentralized Power Supply

2021 ◽  
Author(s):  
P. V. Belyaev ◽  
D. A. Podberezkin
Keyword(s):  
Power System ◽  
Power Supply ◽  
Electrical Power ◽  
Electrical Power System ◽  
Decentralized Power Supply

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.

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.

Gradient Ascent Optimization for Fault Detection in Electrical Power System Based on Wavelet Transformation

2019 ◽  
Vol 14 ◽  
Author(s):  
Iyappan Murugesan ◽  
Karpagam Sathish
Keyword(s):  
Feature Extraction ◽  
Fault Detection ◽  
Power System ◽  
Electrical Power ◽  
Daubechies Wavelet ◽  
Electrical Power System ◽  
Gradient Ascent ◽  
Neural Learning ◽  
Weight Value ◽  
Transmission And Distribution

: This paper presents electrical power system comprises many complex and interrelating elements that are susceptible to the disturbance or electrical fault. The faults in electrical power system transmission line (TL) are detected and classified. But, the existing techniques like artificial neural network (ANN) failed to improve the Fault Detection (FD) performance during transmission and distribution. In order to reduce the power loss rate (PLR), Daubechies Wavelet Transform based Gradient Ascent Deep Neural Learning (DWT-GADNL) Technique is introduced for FDin electrical power sub-station. DWT-GADNL Technique comprises three step, normalization, feature extraction and FD through optimization. Initially sample power TL signal is taken. After that in first step, min-max normalization process is carried out to estimate the various rated values of transmission lines. Then in second step, Daubechies Wavelet Transform (DWT) is employed for decomposition of normalized TLsignal to different components for feature extraction with higher accuracy. Finally in third step, Gradient Ascent Deep Neural Learning is an optimization process for detecting the local maximum (i.e., fault) from the extracted values with help of error function and weight value. When maximum error with low weight value is identified, the fault is detected with lesser time consumption. DWT-GADNL Technique is measured with PLR, feature extraction accuracy (FEA), and fault detection time (FDT). The simulation result shows that DWT-GADNL Technique is able to improve the performance of FEA and reduces FDT and PLR during the transmission and distribution when compared to state-of-the-art works.

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