scholarly journals Current balancing of cascaded H-bridge converters for PV systems with partial shading

2015 ◽  
Vol 34 (6) ◽  
pp. 1879-1895 ◽  
Author(s):  
Diego Iannuzzi ◽  
Mario Pagano ◽  
Luigi Piegari ◽  
Pietro Tricoli
Keyword(s):  
Control Strategy ◽  
Partial Shading ◽  
Content Type ◽  
Pv Systems ◽  
Grid Connection ◽  
Original Contribution ◽  
Scientific Papers ◽  
Converter Topology ◽  
Power Balancing ◽  
Practical Implications

Purpose – The purpose of this paper is to propose a new converter topology for integrating PV plants constituted by many panels into the grid. The converter is capable of implementing MPPT algorithms on different subset of modules and can balance the different energy supplied by panels differently irradiated. The output voltage presents a very low ripple also if small filters are used for grid connection. Design/methodology/approach – In the paper, at first the converter configuration is presented. Then a control strategy for obtaining, at the same time the distributed MPPT and the power balancing on the three phases is proposed. Finally, by means of numerical simulations, the good performances of the proposed converter are shown. Findings – The proposed converter, lent from MMC configurations, is deeply studied and a suitable control strategy is well analyzed in the paper. Analytical model for voltage and current balancing are given. Research limitations/implications – The analysis presented in the paper complete some studies started in the last years and partially presented in previous scientific papers. It reaches a final point and gives all the specific for the realization of the converter and of its control. Practical implications – The paper gives all the instrument to design and realize a PV power plant integrated into building façade. Originality/value – The converter and the control for voltage and current balancing presented in this paper represent a significant original contribution of this work.

Microcontroller-based inverter topology integrated in PV systems

2015 ◽  
Vol 34 (1) ◽  
pp. 132-150 ◽  
Author(s):  
Mounir Bouzguenda ◽  
Tarek Selmi ◽  
Adel Gastli ◽  
Ahmed Masmoudi
Keyword(s):  
Leakage Current ◽  
Control Strategy ◽  
Design Methodology ◽  
Leakage Currents ◽  
Zero Crossing ◽  
Content Type ◽  
Pv Systems ◽  
High Conversion Ratio ◽  
Inverter Topology ◽  
Practical Implications

Purpose – The purpose of this paper is to study the problem of the leakage currents in transformerless inverter topologies. It proposes a novel topology and how important the adopted control strategy on the power quality produced by the inverter. Design/methodology/approach – The paper presents an investigation of a novel transformerless inverter topology. It adopted a control strategy in which the DC source is disconnected from the inverter when the zero vectors of the control are applied. By using such control strategy, the electrical efficiency of the whole system was improved and the leakage current was significantly reduced. Findings – The paper provides a solution to minimize the leakage current in transformerless inverter topologies. Besides, the problem of zero-crossing distortions was totally eliminated. Research limitations/implications – Because of the high conversion ratio of the boost converter, the efficiency of the whole system needs to be enhanced. Practical implications – The paper includes the experimental results of the proposed topology which are in good match with the simulation results. Originality/value – This paper identifies a need to study the leakage current phenomena in transformerless inverter topologies.

scholarly journals Reconfigurable Distributed Power Electronics Technique for Solar PV Systems

Electronics ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1121
Author(s):  
Kamran Ali Khan Niazi ◽  
Yongheng Yang ◽  
Tamas Kerekes ◽  
Dezso Sera
Keyword(s):  
Energy Yield ◽  
Solar Pv ◽  
Charge Redistribution ◽  
Pv System ◽  
Partial Shading ◽  
Pv Systems ◽  
Simulation Based ◽  
In Series ◽  
A Cell ◽  
Power Balancing

A reconfiguration technique using a switched-capacitor (SC)-based voltage equalizer differential power processing (DPP) concept is proposed in this paper for photovoltaic (PV) systems at a cell/subpanel/panel-level. The proposed active diffusion charge redistribution (ADCR) architecture increases the energy yield during mismatch and adds a voltage boosting capability to the PV system under no mismatch by connected the available PV cells/panels in series. The technique performs a reconfiguration by measuring the PV cell/panel voltages and their irradiances. The power balancing is achieved by charge redistribution through SC under mismatch conditions, e.g., partial shading. Moreover, PV cells/panels remain in series under no mismatch. Overall, this paper analyzes, simulates, and evaluates the effectiveness of the proposed DPP architecture through a simulation-based model prepared in PSIM. Additionally, the effectiveness is also demonstrated by comparing it with existing conventional DPP and traditional bypass diode architecture.

Bringing back the social: the way forward for children’s social work?

2017 ◽  
Vol 12 (2-3) ◽  
pp. 190-196 ◽  
Author(s):  
Brid Featherstone ◽  
Anna Gupta ◽  
Kate Morris
Keyword(s):  
Risk Factors ◽  
Social Determinants ◽  
Child Protection ◽  
Design Methodology ◽  
Social Suffering ◽  
Content Type ◽  
Poverty And Inequality ◽  
The Social ◽  
Original Contribution ◽  
Practical Implications

Purpose The purpose of this paper is to argue for the need to move away from a sole focus on assessing and dealing with individualised risk factors in order to more fully engage with and understand the social determinants of many of the harms that are manifest in families. Design/methodology/approach It draws from a number of research studies being conducted by the authors and a literature on psycho-social approaches to social suffering. Findings It highlights the evidence on the contribution of poverty and inequality to many of the problems encountered within families. It explores how hurt, shame and loss are experienced by those who are marginalised and struggling to live well and care safely for themselves and others. Practical implications It highlights the practice implications of adopting an approach that engages with both the social and the psychological and understands their inter-relationship. It offers some thoughts on how the social in psycho-social might receive the attention it deserves, a situation which does not pertain currently. Originality/value It offers an original contribution to thinking in the area of child protection where the focus is primarily on individualised risk factors. It highlights the importance of understanding the social determinants of many of the harms experienced in families and offers some pointers towards thinking and practising differently.

scholarly journals Photovoltaic emulator of different solar array configurations under partial shading conditions using damping injection controller

2020 ◽  
Vol 11 (2) ◽  
pp. 1019
Author(s):  
Mustapha Alaoui ◽  
Hattab Maker ◽  
Azeddine Mouhsen ◽  
Hicham Hihi
Keyword(s):  
Control Strategy ◽  
Solar Array ◽  
Laboratory System ◽  
Electrical Behavior ◽  
Energy Research ◽  
Partial Shading ◽  
Pv Systems ◽  
Pv Array ◽  
Accuracy Speed ◽  
Hybrid Damping

In the last decades, researchers and scientists have been trending towards photovoltaic (PV) solar energy research as one of the noteworthy renewable energies. As a matter of fact, the need for a laboratory system devoted to performing measurements and experimentation on PV systems is being increased. The PV array emulator is designed to accomplish this task by reproducing accurately the electrical behavior of real PV sources. The present paper proposes thus a new control and design of PV array emulators. It is based essentially on a hybrid Damping Injection controller. The proposed control strategy circumvents obviously the existing PV emulator's limitations in terms of accuracy, speed and partial shading emulation. Several results are given and discussed to show the efficiency of the proposed system to emulate PV modules and different PV array configurations under uniform solar irradiance and partial shading conditions.

Crowdsourcing to manage service gaps in service networks

2019 ◽  
Vol 34 (7) ◽  
pp. 1497-1505 ◽  
Author(s):  
Amanda Blair ◽  
Thomas Martin Key ◽  
Matthew Wilson
Keyword(s):  
Literature Review ◽  
Service Quality ◽  
Design Methodology ◽  
Service Networks ◽  
Content Type ◽  
Original Contribution ◽  
Conceptual Paper ◽  
Practical Implications

Purpose The purpose of this paper is to illustrate and conceptualize how crowdsourcing can be implemented as a potential means to address gaps in service quality within service networks and to provide guidance to marketing practitioners on the use of crowdsourcing within service networks. Design/methodology/approach This paper conceptualizes how crowdsourcing can be used to address service quality gaps in service networks and provides propositions regarding the effects of crowdsourcing on service quality gaps. Findings Conceptual paper with a literature review, suggested a model for service quality gaps in service networks and propositions regarding the effects of crowdsourcing to manage service quality gaps. Research limitations/implications This research contributes to the literature on crowdsourcing by theorizing how crowdsourcing impacts service quality in service networks. Practical implications Considerations for managers implementing crowdsourcing strategies and activities within service networks are provided. In particular, implications with regard to forming the crowd, developing the most appropriate approach and integrating value into the firm are discussed. Originality/value This paper offers an original contribution linking crowdsourcing to service quality.

An efficient termination control strategy of air-vented dryer for fabric drying

2018 ◽  
Vol 30 (3) ◽  
pp. 412-427 ◽  
Author(s):  
Yuhui Wei ◽  
Zhaowei Su ◽  
Huashan Lu ◽  
Xue Mei Ding
Keyword(s):  
Energy Consumption ◽  
Control Strategy ◽  
Low Cost ◽  
Drying Time ◽  
Content Type ◽  
Exhaust Duct ◽  
Microscopic Damage ◽  
Novel Strategy ◽  
Drying Efficiency ◽  
Practical Implications

Purpose The purpose of this paper is to develop an efficient termination control strategy of air-vented dryer in term of energy saving, improving smoothness and reducing microscopic damage of fiber. Design/methodology/approach A simple, low cost termination control strategy is developed by testing the instantaneous humidity of exhaust air and then deducing the drying degree of fabric in process. The practicability evaluation of this novel strategy was investigated by using both experimental and mathematical approaches. The effect of termination control strategy on drying efficiency and fabric apparent properties were also discussed. Findings Termination control strategy significantly affects drying time, energy consumption, smoothness and microscopic of fiber. Specially, a novel termination control strategy that the combination of equilibrium moisture content of fabric in ambient environment and relative humidity of exhaust air in exhaust duct is workable and can save 25.2 percent of energy consumption, 26.7 percent of the drying time and improve 0.7 grade of the appearance smoothness, as well as significantly reduce the microscopic damage of fiber compare to the original control strategy of dryer. This indicates possible ways to minimize drying energy consumption and dryer damage by reducing unnecessary migrate out of the water from the clothes. Practical implications The paper is helpful in not only the development of new drying product but also the optimization of appearance smoothness of fabric after drying and reduce the microscopic damage of fiber. Originality/value A novel termination control strategy of dryer is applied to improve drying efficiency of dryer and reduce fabric damage.

Analysis of readiness factors for Industry 4.0 implementation in SMEs using COPRAS

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
R.M. Sriram ◽  
S. Vinodh
Keyword(s):  
Decision Making ◽  
Industry 4.0 ◽  
Design Methodology ◽  
Multi Criteria Decision Making ◽  
Practical Relevance ◽  
Content Type ◽  
Original Contribution ◽  
Manufacturing Competitiveness ◽  
Practical Implications

PurposeThe purpose of this paper is to analyse the readiness factors for Industry 4.0 deployment in small and medium-sized enterprises (SMEs) using complex proportionality assessment (COPRAS) methodology.Design/methodology/approachIndustry 4.0 is vital for ensuring manufacturing competitiveness of SMEs. In order to facilitate Industry 4.0 adoption in SMEs, readiness factors need to be analysed. In this viewpoint, this article presents the analysis of readiness factors using multi-criteria decision-making (MCDM) tool COPRAS.FindingsThe priority of ranking of 15 readiness factors is obtained. The prioritized readiness factors would enable the smooth adoption of Industry 4.0 in SMEs.Practical implicationsThe study has been done based on inputs from industry practitioners and hence the results have practical relevance.Originality/valueThe analysis of readiness factors for Industry 4.0 in SMEs using COPRAS is the original contribution of authors.

Customer-differentiated triadic interaction based on decoupling points

2017 ◽  
Vol 10 (2) ◽  
pp. 185-205 ◽  
Author(s):  
Joakim Wikner ◽  
Jenny Bäckstrand ◽  
Eva Johansson
Keyword(s):  
Supply Chain ◽  
Control Strategy ◽  
Design Methodology ◽  
Customer Requirements ◽  
Content Type ◽  
Triadic Interaction ◽  
Customer Order ◽  
Material Classification ◽  
And Control ◽  
Practical Implications

Purpose The integration of supply chains together with the disintegration of individual actors in the supply chain shifts the focus from actors to challenges in the interaction between actors. This paper aims to identify risk strategies for different supplier interactions in triadic configurations to outline supply strategies. Design/methodology/approach Companies participating in a research project recounted the challenges they faced regarding the integration of customer order-based management and supply from a triad perspective. Six triad configurations were identified, based on the literature, resulting in three risk strategies, which were empirically illustrated in practice by the participating companies. Findings A key finding is that a triad perspective for a customer-differentiated approach to supplier interaction results in a material classification that highlights the circumstances in which to apply “balance efficiency”, “postpone”, “balance responsiveness” and “speculate” supply strategies. Research limitations/implications The research has focused on process drivers and controllability, and the results may require careful interpretation when there is a mix of standardized and customized products because further interaction differentiation may then be required. Practical implications The strategies developed herein provide guidelines for differentiated supplier interaction with explicit focus on triads where customer actors directly influence supplier actors. This approach highlights how outsourcing must be carefully executed when supplier actors are involved in delivery to customer orders. Originality/value The paper sheds new light on how customer requirements impact supplier interaction in terms of decoupling points related to both delivery strategy and control strategy. The study also presents a novel application of the Kraljic matrix in in terms of risk strategies in different triad configurations.

Hierarchy the sectorial performance indicators for Brazilian franchises

2015 ◽  
Vol 21 (1) ◽  
pp. 190-204
Author(s):  
Alvaro Luiz Neuenfeldt Júnior ◽  
Julio Cezar Mairesse Siluk ◽  
Marlon Soliman ◽  
Elpídio Oscar Benitez Nara ◽  
Liane Mahlmann Kipper
Keyword(s):  
Performance Indicators ◽  
Multiple Criteria Decision Making ◽  
Analytic Hierarchy ◽  
Content Type ◽  
Measurement Systems ◽  
Scientific Papers ◽  
Performance Measurement Systems ◽  
Hierarchy Process ◽  
Level Of Importance ◽  
Practical Implications

Purpose – The purpose of this paper is to study the level of importance existing among the indicators that were previously defined for a Performance Measurement Systems (PMS) and are relative to franchises in Brazil, using the Analytic Hierarchy Process (AHP) methodology, together with a series of tests, which are responsible by verifying the degree of reliability, robustness and stability of the parameters used and the results obtained. As a result, the author suggests that the diagnosing of the five delimited indicators have different relevance assigned to them. Design/methodology/approach – This paper reviews extant literatures in Franchise, PMS, Multiple Criteria Decision Making (MCDM), in specific the theory about AHP. Findings – The authors found that it was possible justified, for both the relative and the evaluative method, that the I3 was the main point of the system and, as a consequence, be considered as priority when talking about sectorial development of franchises in Brazil. As for the other indicators, even being located in a level lower than I3, they must be taken into contemplation in these measurements, however, with a relatively inferior importance degree. Practical implications – It was possible to better comprehend which economics and non-economic factors selected have a more predominance in the Brazilian franchise context, according to characteristics of the companies present. Originality/value – The absence of scientific papers that describe the relevance level of the main factors that influence in the Brazilian franchise system.

scholarly journals Knowledge sharing: insights from Campaign for Real Ale (CAMRA) Festival volunteers

2014 ◽  
Vol 5 (3) ◽  
pp. 279-296 ◽  
Author(s):  
Gillian Ragsdell ◽  
Allan Jepson
Keyword(s):  
Knowledge Sharing ◽  
Qualitative Data ◽  
Event Management ◽  
Structured Interviews ◽  
Content Type ◽  
Original Contribution ◽  
Technological Barriers ◽  
Funded Project ◽  
Practical Implications

Purpose – The purpose of this paper is to report the findings of a British Academy funded project that investigated the knowledge sharing activities of volunteers within three Campaign for Real Ale (CAMRA) festivals. Design/methodology/approach – Three case study festivals were selected based on factors such as longevity and size. Rich qualitative data were collected using semi-structured interviews with volunteers in key festival roles and focus groups with a range of other volunteers. Findings – A range of inhibitors and enablers to sharing festival knowledge were identified, some of which have not yet featured in the knowledge management (KM) literature. Riege's categorisation of individual, organisational and technological barriers to knowledge sharing was used to frame discussion of the findings. Research limitations/implications – Volunteer-led festivals are a novel context for knowledge sharing research yet the principles of volunteer working and the project-based approach to most festivals means they are a fertile arena for lessons in KM. Practical implications – Insights into knowledge sharing activities were generated from this study which could improve KM practices in festivals. They included the use of the master-apprentice model, raising the value of post-project reviews and designing festival layout with knowledge sharing in mind. Originality/value – The study of knowledge sharing is an original contribution to the field of event management.

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