Study on the Calculation of Power Grid Asset Utilization Index

2013 ◽  
Vol 860-863 ◽  
pp. 2122-2126
Author(s):  
Guang Yu Lei ◽  
Yuan Zeng ◽  
Cong Zhao
Keyword(s):  
Network Structure ◽  
Power Grid ◽  
Distribution Lines

As the using quality of power grid asset becomes the focus of concern, the reasonable power grid asset utilization index is needed. The paper discusses the researching level of domestic and foreign power grid assets utilization and gives a brief analysis of the typical factors which have great influential on the utilization of power grid asset. According to safety and network structure requirements during the operation, the traditional power grid asset utilization indices were improved. Finally, the paper selects the typical 10kV distribution lines to conduct the calculation of utilization, and gives some analysis and advice according to the results.

scholarly journals Detection of Myocardial Infarction Using ECG and Multi-Scale Feature Concatenate

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1906
Author(s):  
Jia-Zheng Jian ◽  
Tzong-Rong Ger ◽  
Han-Hua Lai ◽  
Chi-Ming Ku ◽  
Chiung-An Chen ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Network Structure ◽  
Class Imbalance ◽  
Class Imbalance Problem ◽  
Multi Scale ◽  
Imbalance Problem ◽  
Average Accuracy ◽  
Significant Difference ◽  
Electrocardiogram Ecg

Diverse computer-aided diagnosis systems based on convolutional neural networks were applied to automate the detection of myocardial infarction (MI) found in electrocardiogram (ECG) for early diagnosis and prevention. However, issues, particularly overfitting and underfitting, were not being taken into account. In other words, it is unclear whether the network structure is too simple or complex. Toward this end, the proposed models were developed by starting with the simplest structure: a multi-lead features-concatenate narrow network (N-Net) in which only two convolutional layers were included in each lead branch. Additionally, multi-scale features-concatenate networks (MSN-Net) were also implemented where larger features were being extracted through pooling the signals. The best structure was obtained via tuning both the number of filters in the convolutional layers and the number of inputting signal scales. As a result, the N-Net reached a 95.76% accuracy in the MI detection task, whereas the MSN-Net reached an accuracy of 61.82% in the MI locating task. Both networks give a higher average accuracy and a significant difference of p < 0.001 evaluated by the U test compared with the state-of-the-art. The models are also smaller in size thus are suitable to fit in wearable devices for offline monitoring. In conclusion, testing throughout the simple and complex network structure is indispensable. However, the way of dealing with the class imbalance problem and the quality of the extracted features are yet to be discussed.

scholarly journals Design and Simulation of a Unified Power Quality Conditioner by Fuzzy Logic for Egyptian Power Grid Connected to Zafarana Egypt Wind System

2019 ◽  
Vol 4 (9) ◽  
pp. 1-8
Author(s):  
Montaser Abd El Sattar ◽  
Adel A. Elbaset ◽  
Ali H. KasemAlaboudy ◽  
Wessam Arafa Hafez
Keyword(s):  
Wind Energy ◽  
Power Quality ◽  
Reactive Power ◽  
Power Grid ◽  
Energy System ◽  
Wind System ◽  
Unified Power Quality Conditioner ◽  
Wind Energy System ◽  
Power Quality Conditioner

Wind energy system is lately receiving a lot of attention, because they are cost inexpensive, environmental safe and clean renewable energy source, as compared with nuclear and fossil fuel power generation. The operational characteristics of wind electric turbines has considerable dissatisfaction and stress on the quality of electric power system. Harmonics, variations of voltage and reactive power are most of power quality issues for grid connected with wind turbine. This paper introduces a design and simulation of unified power quality conditioner using a fuzzy controller to improve the power quality for Egyptian power grid connected to Zafarana Egypt wind system. The proposed performance of the unified power quality conditioner system is verified by simulating the model using MATLAB/SIMULINK environment. The simulation results showed that the proposed unified power quality conditioner provide efficient cancellation of both load current  harmonics  and supply voltage sag in addition to compensation of reactive power, and thus making the electrical grid connected wind energy system more efficient by improving the quality of power.

Analysis of UHV Power Grid Operation and Maintenance System Construction and Optimization Strategy - Taking Shan-Xi UHV Grid as an Example

2014 ◽  
Vol 960-961 ◽  
pp. 1108-1111
Author(s):  
Ding Qiang Duan ◽  
Li Ting Jiao
Keyword(s):  
Power Grid ◽  
System Construction ◽  
Optimization Strategy ◽  
Power Company ◽  
Operation And Maintenance ◽  
Speed Up ◽  
Control Requirement ◽  
Grid Operation ◽  
Automation Technology

Compared with the traditional power grid, UHV power grid has the character of stronger system function, higher control requirement, and also set a higher request to the daily maintenance management. The operation and maintenance experience of Shan-xi province electric power company on the UHV power grid proved the importance of establishing the new mode of management, strengthening the application of automation technology, and guarenteeing the technology and resources . In order to improve the efficience and quality of UHV power grid operation and maintenance, we should speed up the formulation of operation guidelines for UHV live working and strengthen personnel training and reserve technical talents.

scholarly journals A Resilience Toolbox and Research Design for Black Sky Hazards to Power Grids

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Dmitry Borisoglebsky ◽  
Liz Varga
Keyword(s):  
Simulation Model ◽  
Business Processes ◽  
Power Grid ◽  
Multicriteria Decision Making ◽  
Two Dimensions ◽  
Power Grids ◽  
Research Approach ◽  
Grid Simulation ◽  
The Difference

A structured collection of tools for engineering resilience and a research approach to improve the resilience of a power grid are described in this paper. The collection is organized by a two-dimensional array formed from typologies of power grid components and business processes. These two dimensions provide physical and operational outlooks, respectively, for a power grid. The approach for resilience research is based on building a simulation model of a power grid which utilizes a resilience assessment equation to assess baseline resilience to a hazards’ profile, then iteratively selects a subset of tools from the collection, and introduces these as interventions in the power grid simulation model. Calculating the difference in resilience associated with each subset supports multicriteria decision-making to find the most convenient subset of interventions for a power grid and hazards’ profile. Resilience is an emergent quality of a power grid system, and therefore resilience research and interventions must be system-driven. This paper outlines further research required prior to the practical application of this approach.

scholarly journals Training of argon arc welding process for tube aluminum busbar melting pole in UHV power station

2018 ◽  
Vol 175 ◽  
pp. 03010
Author(s):  
Hanyang Liyang
Keyword(s):  
Arc Welding ◽  
Power Grid ◽  
Large Diameter ◽  
Welding Process ◽  
Power Station ◽  
Grid Connection ◽  
Level Of Automation ◽  
Large Level ◽  
Arc Welding Process

The development of power grid is showing that voltage level is from low to high, networking scale is from small to large, level of automation is from weak to strong.. [1] as the hub of power grid connection between substations, the capacity and automation level of substations is also improving. The large diameter and thick walled tubular busbars of substations have been widely applied. Because of the wide application of tubular aluminum busbar, its welding quality has affected the overall quality of the power plant. Therefore, it is an effective way to improve welding level of power station busbar by scientifically making technological measures and welding codes and carrying out adaptive training for welding operators. In view of the feasibility of the argon arc welding (MIG) welding process and the feasibility of training for the tubular aluminum busbar of UHV power station, the characteristics of the welding technology of tubular aluminum busbar and the technological measures taken by the welding technicians are discussed.

Three macroscopic indices for describing the quality of AC/DC power grid structures

2016 ◽  
Vol 10 (1) ◽  
pp. 175-182 ◽  
Author(s):  
Zheng Xu ◽  
Pengcheng Song ◽  
Hongyang Huang
Keyword(s):  
Power Grid ◽  
Dc Power

scholarly journals Pediatric health-related quality of life and school social capital through network perspectives

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0242670
Author(s):  
Tomoya Hirota ◽  
Michio Takahashi ◽  
Masaki Adachi ◽  
Kazuhiko Nakamura
Keyword(s):  
Quality Of Life ◽  
Social Capital ◽  
Network Structure ◽  
Population Sample ◽  
Health Related Quality ◽  
Pediatric Health ◽  
Related Quality ◽  
Health Related ◽  
School Social Capital

Background Despite their importance in population health among children and adolescents, our understanding of how individual items mutually interact within and between pediatric health-related quality of life (HRQOL) and school social capital is limited. Methods We employed network analysis in a general population sample of 7759 children aged 9–15 years to explore the network structure of relations among pediatric HRQOL and school social capital items measured using validated scales. Furthermore, network centrality was examined to identify central items that had stronger and more direct connections with other items in the network than others. Network structure and overall strength of connectivity among items were compared between groups (by sex and age). Results Our analysis revealed that the item related to school/academic functioning and the item related to shared enjoyment among students had the highest strength centrality in the network of HRQOL and school social capital, respectively, underpinning their critical roles in pediatric HRQOL and school social capital. Additionally, the edge connecting “I trust my friends at school” and “trouble getting along with peers” had the strongest negative edge weight among ones connecting school social capital and pediatric HRQOL constructs. Network comparison test revealed stronger overall network connectivity in middle schoolers compared to elementary schoolers but no differences between male and female students. Conclusion The network approach elucidated the complex relationship of mutually influencing items within and between pediatric HRQOL and school social capital. Addressing central items may promote children’s perceived health and school social capital.

scholarly journals Design of power substation placement with GIS tracing tools

Vestnik IGEU ◽  
2019 ◽  
pp. 75-83 ◽  
Author(s):  
А.В. Gadalov ◽  
S.V. Kosyakov
Keyword(s):  
Low Voltage ◽  
Power Grid ◽  
Distribution Networks ◽  
Power Lines ◽  
Electrical Networks ◽  
Voltage Distribution ◽  
Transformer Substation ◽  
Urban Distribution ◽  
Gis Environment

Analytical methods that are currently used to determine transformer substation placement in the process of planning the development of low-voltage distribution networks are based on calculating the lengths of future power lines by Euclidean distance, or methods for comparing several alternative placement options taking into account the routes of power lines. Assumptions made in this case lead to the fact that for the selected location of the substation, the total cost of the power lines connected to it may exceed the possible minimum. The use of modern GIS technologies allows simulating the routes of laying power lines on the map bypassing the existing obstacles or finding the cheapest routes for crossing them. These opportunities can be used to improve the quality of designing urban distribution networks through minimizing the construction cost of new power lines. However, the methods of organizing the solution to such a design problem have not yet found practical applications. The aim of the work is to develop a practical method of designing the placement of power substations in the GIS environment and its verification using real data. The paper uses methods of spatial modeling in the GIS environment, including methods of overlay, finding optimal paths on graphs and power grid inventory, as well as discrete optimization methods. A method of computer-aided design of transformer substation placement in urban distribution low-voltage networks is proposed and implemented as a GIS software module, which allows finding the optimal options of the placement cost at the stages of network scheme selection. The paper presents the results of the method analysis based on studying the design of the power grid scheme of Ivanovo city quarters as an example. The results confirm the possibility of using GIS to improve the quality of decisions on the choice of placement of low voltage distribution substations when designing urban electrical networks and can be used in the electrical networks CAD.

scholarly journals Hierarchical learning optimisation method for the coordination dispatch of the inter-regional power grid considering the quality of service index

2020 ◽  
Vol 14 (18) ◽  
pp. 3673-3684
Author(s):  
Kai Lv ◽  
Hao Tang ◽  
Birgitte Bak-Jensen ◽  
Jayakrishnan Radhakrishna Pillai ◽  
Qi Tan ◽  
...  
Keyword(s):  
Quality Of Service ◽  
Power Grid ◽  
Regional Power ◽  
Hierarchical Learning
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