scholarly journals Review of Distribution Network Phase Unbalance: Scale, Causes, Consequences, Solutions, and Future Research Direction

2020 ◽  
Author(s):  
Kang Ma ◽  
Lurui Fang ◽  
Wangwei Kong
Keyword(s):  
System Analysis ◽  
Distribution Networks ◽  
Research Direction ◽  
Mass Scale ◽  
Optimal Placement ◽  
Future Research ◽  
Data Scarcity ◽  
Three Phase ◽  
Using Data ◽  
The Uk

Phase unbalance is widespread in the distribution networks in the UK, continental Europe, US, China, and other countries. First, this paper reviews the mass scale of phase unbalance and its causes and consequences. Three challenges arise from phase rebalancing: the scalability, data scarcity, and adaptability (towards changing unbalance over time) challenges. Solutions to address the challenges are: 1) using retrofit-able, maintenance-free, automatic solutions to overcome the scalability challenge; 2) using data analytics to overcome the data-scarcity challenge; and 3) using phase balancers or other online phase rebalancing solutions to overcome the adaptability challenge. This paper categorizes existing phase rebalancing solutions into three classes: 1) load/lateral re-phasing; 2) using phase balancers; 3) controlling energy storage, electric vehicles, distributed generation, and micro-grids for phase rebalancing. Their advantages and limitations are analyzed and ways to overcome the limitations are recommended. Finally, this paper suggests future research topics: 1) long-term forecast of phase unbalance; 2) whole-system analysis of the unbalance-induced costs; 3) phase unbalance diagnosis for data-scarce LV networks; 4) techno-commercial solutions to exploit the flexibility from large three-phase customers for phase balancing; 5) the optimal placement of phase balancers; 6) the transition from single-phase customers to three-phase customers. <br>

Review of Distribution Network Phase Unbalance: Scale, Causes, Consequences, Solutions, and Future Research Direction

2020 ◽  
Author(s):  
Kang Ma ◽  
Lurui Fang ◽  
Wangwei Kong
Keyword(s):  
System Analysis ◽  
Distribution Networks ◽  
Research Direction ◽  
Mass Scale ◽  
Optimal Placement ◽  
Future Research ◽  
Data Scarcity ◽  
Three Phase ◽  
Using Data ◽  
The Uk

Phase unbalance is widespread in the distribution networks in the UK, continental Europe, US, China, and other countries. First, this paper reviews the mass scale of phase unbalance and its causes and consequences. Three challenges arise from phase rebalancing: the scalability, data scarcity, and adaptability (towards changing unbalance over time) challenges. Solutions to address the challenges are: 1) using retrofit-able, maintenance-free, automatic solutions to overcome the scalability challenge; 2) using data analytics to overcome the data-scarcity challenge; and 3) using phase balancers or other online phase rebalancing solutions to overcome the adaptability challenge. This paper categorizes existing phase rebalancing solutions into three classes: 1) load/lateral re-phasing; 2) using phase balancers; 3) controlling energy storage, electric vehicles, distributed generation, and micro-grids for phase rebalancing. Their advantages and limitations are analyzed and ways to overcome the limitations are recommended. Finally, this paper suggests future research topics: 1) long-term forecast of phase unbalance; 2) whole-system analysis of the unbalance-induced costs; 3) phase unbalance diagnosis for data-scarce LV networks; 4) techno-commercial solutions to exploit the flexibility from large three-phase customers for phase balancing; 5) the optimal placement of phase balancers; 6) the transition from single-phase customers to three-phase customers. <br>

scholarly journals Review of Distribution Network Phase Imbalance: Scale, Consequences, Solutions, and Future Research Direction

2019 ◽  
Author(s):  
Kang Ma ◽  
Lurui Fang ◽  
Wangwei Kong
Keyword(s):  
Distributed Generation ◽  
Electric Vehicles ◽  
Distribution Networks ◽  
Research Direction ◽  
Mass Scale ◽  
Future Research ◽  
Data Scarcity ◽  
Using Data ◽  
The Uk ◽  
Micro Grids

Phase imbalance is widespread in the distribution networks in the UK, continental Europe, US, China, and other countries. First, this paper reviews the mass scale of phase imbalance and its consequences. Three challenges arise from phase rebalancing: the scalability, data scarcity, and adaptability (towards changing imbalance over time) challenges. Solutions to address the challenges are: 1) using retrofit-able, maintenance-free, automatic solutions to overcome the scalability challenge; 2) using data analytics to overcome the data-scarcity challenge; and 3) using phase balancers or other online phase rebalancing solutions to overcome the adaptability challenge. This paper categorizes existing phase rebalancing solutions into three classes: 1) load/lateral re-phasing; 2) using phase balancers; 3) controlling energy storage, electric vehicles, distributed generation, and micro-grids for phase rebalancing. Their advantages and limitations are analyzed and ways to overcome the limitations are recommended. Finally, this paper suggests future research topics.<br>

scholarly journals A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Algorithm for Networks with Local Controllers—Part I: Algorithm Development

2021 ◽  
Author(s):  
Evangelos Pompodakis ◽  
Arif Ahmed ◽  
Minas Alexiadis
Keyword(s):  
Distribution System ◽  
Power Flow ◽  
Distribution Systems ◽  
System Analysis ◽  
Distribution Networks ◽  
Theoretical Development ◽  
Modern Distribution ◽  
Three Phase ◽  
Flow Algorithm ◽  
Weather Variations

<b>Local voltage controllers (LVCs) are important components of a modern distribution system for regulating the voltage within permissible limits. This manuscript presents a sensitivity-based three-phase weather-dependent power flow algorithm for distribution networks with LVCs. This Part I presents the theoretical development of the proposed algorithm, which has four distinct characteristics: a) it considers the three-phase unbalanced nature of distribution systems, b) the operating state of LVCs is calculated using sensitivity parameters, which accelerates the convergence speed of the algorithm, c) it considers the precise switching sequence of LVCs based on their reaction time delays, and d) the nonlinear influence of weather variations in the power flow is also taken into consideration. Simulations and validation results presented in Part II indicate that the proposed approach outperforms other existing algorithms with respect to the accuracy and speed of convergence, thus making it a promising power flow tool for accurate distribution system analysis. </b><div><b><br></b></div>

scholarly journals A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Approach for Networks with Local Controllers—Part II: Case Studies

2020 ◽  
Author(s):  
Evangelos Pompodakis ◽  
Arif Ahmed ◽  
Minas Alexiadis
Keyword(s):  
Distribution System ◽  
Power Flow ◽  
System Analysis ◽  
Distribution Networks ◽  
Switching Sequence ◽  
Magnetic Effects ◽  
Three Phase ◽  
Node Network ◽  
Distribution System Planning ◽  
Simulation Results

<p><b>Power flow is an integral part of distribution system planning, monitoring, operation, and analysis. This two-part paper proposes a sensitivity-based three-phase weather-dependent power flow approach for accurately simulating distribution networks with local voltage controllers (LVC). This part II, firstly, presents simulation results of the proposed approach in an 8-Bus and 7-Bus network, which are validated using dynamic simulation. Secondly, simulation results for the IEEE 8500-node network are also presented. An extensive comparison is conducted between the proposed sensitivity-based approach and the other existing power flow approaches with respect to result accuracy and convergence speed. Moreover, the influence of weather and magnetic effects on the power flow results and the LVC states is also investigated. Simulation results confirm that the proposed sensitivity-based approach produces more accurate results than the existing approaches since it considers the actual switching sequence of LVCs as well as the weather and magnetic effects on the network. Moreover, the proposed algorithm exhibits accelerated convergence due to the usage of the sensitivity parameters, which makes it an important tool for distribution system analysis. </b></p>

scholarly journals A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Approach for Networks with Local Controllers—PART II: Case Studies

2021 ◽  
Author(s):  
Evangelos Pompodakis ◽  
Arif Ahmed ◽  
Minas Alexiadis
Keyword(s):  
Distribution System ◽  
Power Flow ◽  
System Analysis ◽  
Distribution Networks ◽  
Switching Sequence ◽  
Magnetic Effects ◽  
Three Phase ◽  
Node Network ◽  
Distribution System Planning ◽  
Simulation Results

<p><b>Power flow is an integral part of distribution system planning, monitoring, operation, and analysis. This two-part paper proposes a sensitivity-based three-phase weather-dependent power flow approach for accurately simulating distribution networks with local voltage controllers (LVC). This part II, firstly, presents simulation results of the proposed approach in an 8-Bus and 7-Bus network, which are validated using dynamic simulation. Secondly, simulation results for the IEEE 8500-node network are also presented. An extensive comparison is conducted between the proposed sensitivity-based approach and the other existing power flow approaches with respect to result accuracy and convergence speed. Moreover, the influence of weather and magnetic effects on the power flow results and the LVC states is also investigated. Simulation results confirm that the proposed sensitivity-based approach produces more accurate results than the existing approaches since it considers the actual switching sequence of LVCs as well as the weather and magnetic effects on the network. Moreover, the proposed algorithm exhibits accelerated convergence due to the usage of the sensitivity parameters, which makes it an important tool for distribution system analysis. </b></p>

scholarly journals A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Algorithm for Networks with Local Controllers—Part I: Algorithm Development

2021 ◽  
Author(s):  
Evangelos Pompodakis ◽  
Arif Ahmed ◽  
Minas Alexiadis
Keyword(s):  
Distribution System ◽  
Power Flow ◽  
Distribution Systems ◽  
System Analysis ◽  
Distribution Networks ◽  
Theoretical Development ◽  
Modern Distribution ◽  
Three Phase ◽  
Flow Algorithm ◽  
Weather Variations

<b>Local voltage controllers (LVCs) are important components of a modern distribution system for regulating the voltage within permissible limits. This manuscript presents a sensitivity-based three-phase weather-dependent power flow algorithm for distribution networks with LVCs. This Part I presents the theoretical development of the proposed algorithm, which has four distinct characteristics: a) it considers the three-phase unbalanced nature of distribution systems, b) the operating state of LVCs is calculated using sensitivity parameters, which accelerates the convergence speed of the algorithm, c) it considers the precise switching sequence of LVCs based on their reaction time delays, and d) the nonlinear influence of weather variations in the power flow is also taken into consideration. Simulations and validation results presented in Part II indicate that the proposed approach outperforms other existing algorithms with respect to the accuracy and speed of convergence, thus making it a promising power flow tool for accurate distribution system analysis. </b><div><b><br></b></div>

scholarly journals Facets extraction-based approach for query recommendation using data mining approach

2018 ◽  
Vol 7 (1) ◽  
pp. 121
Author(s):  
A. V. Zadgaonkar ◽  
A. J. Agrawal ◽  
S. Aote
Keyword(s):  
Search Engines ◽  
Text Processing ◽  
Research Direction ◽  
Relevant Information ◽  
Future Research ◽  
Search Results ◽  
Data Mining Approach ◽  
Lexical Resource ◽  
Query Recommendation ◽  
Using Data

Search engines are popularly utilized for extracting desired information from World Wide Web by users.  Efficiency of these search engines are dependent on how fast search results can be retrieved and whether these results reflects the desired info or not. For a particular query, vast amount of relevant information is scattered across the multiple web pages. Search engines generate multiple web links as a output. It has been a jigsaw puzzle for users to identify and select relevant links to extract further desired information. To address this issue, we are proposing an approach for Query Recommendation for getting relevant search results from web using facet mining techniques. Facets are the semantically related words for a query which defines its multiple aspects. We are extracting these aspects of a query from Wikipedia pages which is considered to be a trustworthy resource on the web. Our proposed system uses various text processing techniques to refine the results using lexical resource like WorldNet. In this paper we are discussing our approach and its implementation and results obtained. In the paper , Discussion on future research direction is included to conclude.

scholarly journals A Sensitivity-Based Three-Phase Weather-Dependent Power Flow Approach for Networks with Local Controllers—Part II: Case Studies

2020 ◽  
Author(s):  
Evangelos Pompodakis ◽  
Arif Ahmed ◽  
Minas Alexiadis
Keyword(s):  
Distribution System ◽  
Power Flow ◽  
System Analysis ◽  
Distribution Networks ◽  
Switching Sequence ◽  
Magnetic Effects ◽  
Three Phase ◽  
Node Network ◽  
Distribution System Planning ◽  
Simulation Results

<p><b>Power flow is an integral part of distribution system planning, monitoring, operation, and analysis. This two-part paper proposes a sensitivity-based three-phase weather-dependent power flow approach for accurately simulating distribution networks with local voltage controllers (LVC). This part II, firstly, presents simulation results of the proposed approach in an 8-Bus and 7-Bus network, which are validated using dynamic simulation. Secondly, simulation results for the IEEE 8500-node network are also presented. An extensive comparison is conducted between the proposed sensitivity-based approach and the other existing power flow approaches with respect to result accuracy and convergence speed. Moreover, the influence of weather and magnetic effects on the power flow results and the LVC states is also investigated. Simulation results confirm that the proposed sensitivity-based approach produces more accurate results than the existing approaches since it considers the actual switching sequence of LVCs as well as the weather and magnetic effects on the network. Moreover, the proposed algorithm exhibits accelerated convergence due to the usage of the sensitivity parameters, which makes it an important tool for distribution system analysis. </b></p>

scholarly journals Mapping the Greek Wine Supply Chain: A Proposed Research Framework

Foods ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2859
Author(s):  
Foivos Anastasiadis ◽  
Maria Alebaki
Keyword(s):  
Supply Chain ◽  
Value Chain ◽  
Research Direction ◽  
Wine Industry ◽  
Future Research ◽  
Complex Nature ◽  
Research Framework ◽  
Integrated Research ◽  
Chain Maps ◽  
Using Data

The wine industry involves both the production (i.e., from vine to wine) and consumption of wine (i.e., dining and tourism experiences). This results in a complicated system of intertwined product and services supply chains. Recent studies in the field suggest several key perspectives for future research, such as sustainability, resilience and circular economy. However, the complex nature of the sector which comprises numerous stakeholders and flows (i.e., products—services—information), entailing knotty interactions and interdependencies, makes any research direction questionable in terms of its effectiveness. Therefore, the objective of this study is to provide a tool for designing targeted future research in such multiple environments. We employed an end-to-end mapping approach using data from the Greek wine supply chain, identifying essential insights for a compelling research agenda. The key output is a set of three supply chain maps revealing the structure, processes and actors from all the main angles: basic production, value chain and stakeholders. A synthesis of these maps supports an overall understanding of the sector, unmasking any interaction and hidden information holdups. The study thus aims to offer an integrated research framework that highlights the leading priorities of the Greek wine industry.

Physiotherapists and Evidence Based Practice: An Opportunity or Threat to the Profession?

2001 ◽  
Vol 6 (1) ◽  
pp. 62-74 ◽  
Author(s):  
Rose Wiles ◽  
Sue Barnard
Keyword(s):  
Health Professionals ◽  
Evidence Based Practice ◽  
Central Element ◽  
Professional Autonomy ◽  
Future Research ◽  
Evidence Based ◽  
The Status ◽  
Using Data ◽  
The Uk ◽  
The Impact

The profession of physiotherapy in the UK is undergoing a period of change. Prominent among these aspects of change is the movement to evidence based practice (EBP). EBP is a central element of policy in the National Health Service (NHS). It is being implemented in physiotherapy as a means of securing contracts with purchasers but also as a means of contesting challenges from alternative practitioners and health professionals to the areas of work that physiotherapists view as their territory. Using data collected from a qualitative study of 56 physiotherapists of different grades working in different sectors of the NHS, this paper explores physiotherapists’ views of EBP and the impact that they expect it to have on professional boundaries and on the status and practice of physiotherapy. The study indicated that physiotherapists’ views may differ according to their position in the profession. Senior physiotherapists appeared to view the development of EBP as a threat to the profession which would decrease professional autonomy and the status of the profession. In contrast, junior and superintendent physiotherapists appeared to view EBP as an opportunity for strengthening the profession. The impact EBP will have on the profession of physiotherapy and its relationships with a range of health professionals is as yet unknown as are the responses that physiotherapists are likely to have to this development. This study identifies the areas in which conflicts are likely to be played out. A focus for future research analysing the impact of EBP is suggested.

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