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voltage profile Enhancement and Power Loss Reduction with Economic Feasibility Using Small Capacity Distribution Transformers

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Energy Engineering 2022年第6期119卷 2447-2467页

作者： Rasool M.Imran Mohammed R.Saeed Mohammed Amer Mohammed Osama A.Suhry Ihsan H.Abdulqadder Hasan Wahhab Salih Mohammed R.Almallah Firas M.F.Flaih Department of Electric Power Techniques Al-Hussain University CollegeKarbala56001Iraq School of Artificial Intelligence Wuchang University of TechnologyWuhan430223China State Company of the North Distribution Electricity Ministry of ElectricityBaghdad10013Iraq Department of Informatics and Software Engineering Cihan University-ErbilErbilKurdistan44001Iraq Najaf Gas Turbine Power Plant General Company of the Electricity ProductionMinistry of ElectricityBaghdad10013Iraq General Company of the Electricity Transmission-North Region Ministry of ElectricityBaghdad10013Iraq

Usually,rural areas can be electrified via three-phase distribution transformers with relatively large *** such areas,low voltage lines are used for long distances,which cause power losses and voltage drop for different types of *** losses and improving voltage profiles in rural distribution networks are significant challenges for electricity distribution *** different solutions were proposed in the literature to overcome these challenges,most of them face difficulties when applied in the conventional distribution *** address the above issues,an applicable solution is proposed in this paper by installing a number of small-capacity distribution transformers instead of every single large-capacity transformer in rural *** proposed approach is implemented in the branch network of Al-Hoqool village,which belongs to the Nineveh distribution *** network has been inspected on-site,drawn,and analyzed using the electrical systems analysis program(ETAP).The analysis showed that using the single-phase pole-mounted transformers can improve the voltage in the network’s end by 29%and enhance the voltage profile for all *** analysis has also demonstrated that the modification can reduce the total power losses by 78%compared to the existing *** the economic aspect,the payback period for the proposed network is assigned to be 20 months.

关键词： Single-phase pole-mounted transformer three-phase transformer power losses voltage profile distribution networks

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voltage profile of Feeder with Multiple Distributed Generators

Voltage Profile of Feeder with Multiple Distributed Generato...

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2009年中国智能自动化会议

作者： LI Zhong-xu,SUN Qiu-ye,XU Li-li (School of Information Science and Engineering,Northeastern University, Shenyang 110004,China)

Confronted with the aging and stressful power system,a new kind of meshed and intenigent network called"IntelliGrid"or"Smart Grid"is put forward,which is regarded as the future mode of power *** Generation(DG) plays an important role in the design and realization of the futuristic IntelliGrid,due to its improvement to the power quality,reliability,and flexibility of the ***,the integration of DG in distribution networks may create technical and safety *** profile of feeder with DG connected is a key factor of power quality and an important issue in the futuristic IntelliGrid,which is focused in this ***,a normal curve load distribution model is *** based on this model,the normal curve is divided into many differential *** calculating the power loss in each differential element,the power distribution of the feeder is *** the voltage drop and voltage profile can be derived out *** simulation,the impact of DG’s number,location and capacity on voltage profile is *** shows that to ensure the feeder voltage within the permitted range,there should be some restrictions to DG’s planning scheme.

关键词： Distributed Generation voltage profile Multiple DGs, Normal Curve Load Distribution Model

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Load distribution model and voltage static profile of Smart Grid

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Journal of Central South University 2010年第4期17卷 824-829页

作者：孙秋野李钟旭杨珺罗艳红 Institute of Electrical Automation Northeastern University(Shenyang)

voltage profiles of feeders with the connection of distributed generations(DGs) were investigated.A unified typical load distribution model was *** on this model,exact expressions of feeder voltage profile with single and double DGs were derived and used to analyze the impact of DG's location and capacity on the voltage profile ***,a general formula of the voltage profile was *** limitation of single DG and necessity of multiple DGs for voltage regulation were also *** the simulation,voltage profiles of feeders with single and double DGs were *** voltage excursion rate is 7.40% for only one DG,while 2.48% and 2.36% for double *** is shown that the feeder voltage can be retained in a more appropriate range with multiple DGs than with only one *** the total capacity of DGs is better than concentrating it at one point.

关键词： Smart Grid distributed generation typical load distribution model voltage profile

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Partial Charging of Capacitors for Improving voltage profiles of CSI Fed Motor Drives

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Chinese Journal of Electrical Engineering 2020年第4期6卷 77-85页

作者： Zheng Wang Yang Xu School of Electrical Engineering Southeast UniversityNanjing 210096China

The fast switching behaviors of wide bandgap devices bring some challenges such as high du/dt and limited short-circuit current withstand capability to the reliable operation of the motor *** current-source-inverter(CSI)provides a promising solution in mitigating those challenges by owning the DC-link choke,the reverse-voltage blocking switches and AC commutation *** further reduce du/dt on switches of CSI fed motor drives,the technique of partial charging of capacitors have been investigated in this *** designing the series-connected and the parallel-connected partial-charging circuit for capacitors in DC-link,the voltage profile of CSI could be ***,the zero-voltage-switching(ZVS)is achieved for main power switches,the du/dt is reduced and the overvoltage protection is *** working mechanism of the technique of partial charging of capacitor is described and one example is discussed on the dual three-phase motor *** experimental verification is presented to show the performance of partial charging technique for improving voltage profile of CSI fed motor drives.

关键词： Current source inverter partial charging voltage profile zero-voltage switching overvoltage protection

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Geometrical and electrical optimization of NS-SDBD streamwise plasma heat knife for aircraft anti-icing

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Chinese Journal of Aeronautics 2023年第2期36卷 87-99页

作者： Zhi SU Hua LIANG Haohua ZONG Jun LI Xu FANG Biao WEI Jie CHEN Weiliang KONG Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi'an 710038China Institute of Aero-engine School of Mechanical EngineeringXi'an Jiaotong UniversityXi'an 710049China Northwest Institute of Nuclear Technology Xi'an 710024China The Green Aerotechnics Research Institute Chongqing Jiaotong UniversityChongqing 404100China

Ice accretion on aircraft encountering supercooled water droplets in clouds poses great risks to flight performance and *** the aim of optimizing the newly developed streamwise plasma heat knife method for anti-icing,a parametric investigation is carried out in this *** influence of the detailed voltage profile on the heating effects of a Surface Dielectric Barrier Discharge driven by Nanosecond Pulses(NS-SDBD)is investigated,and a comparison of the antiicing performance among different configurations of streamwise plasma heat knife is *** results show that columnar high-temperature regions produced by a multi-streamer discharge appear at small pulse rise time,but become diffuse as the pulse rise time *** optimal pulse rise time exists to provide a wide range and high value of temperature,which is found to be 150 ns for the setup in the present *** influence of the pulse fall time is much weaker than that of the rise *** range and value of the temperature decrease with increasing pulse fall time.A greater pulse width is found to improve the heating effect by increasing the discharge *** a spanwise electrode is placed connecting the streamwise electrodes of the streamwise plasma heat knife at the airfoil leading edge,the anti-icing performance becomes poorer,whereas good performance is achieved when the spanwise electrode is at the edge of the streamwise *** on this,a three-level configuration of the plasma heat knife is proposed,and its anti-icing performance is found to be much better than that of the original configuration.

关键词： Airfoil icing mitigation Dielectric barrier discharge Nanosecond pulse voltage profile Plasma

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A New Framework for Employing Responsive End-Users Using FAHP and PSO Algorithm

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Computers, Materials & Continua 2023年第1期74卷 951-964页

作者： Reza Etemad Mohammad Sadegh Ghazizadeh Mehrdad Ahmadi Kamarposhti Ilhami Colak Kei Eguchi Faculty of Electrical Engineering Shahid Beheshti UniversityA.C.TehranIran Department of Electrical Engineering Jouybar BranchIslamic Azad UniversityJouybarIran Department of Electrical and Electronics Engineering Faculty of Engineering and ArchitecturesNisantasi UniversityIstanbulTurkey Department of Information Electronics Fukuoka Institute of TechnologyFukuokaJapan

The capacitor bank and synchronous condenser have been the only available sources of reactive ***,most of the appliances use a power electronic interface for their *** a power electronic interface addsmany features to these *** of the promising features is their capability to interact with Volt-VAR *** this paper was investigated the reactive power interaction of the end-user *** this purpose,the distribution network buses are ranked based on their effectiveness,followed by studying their interaction in the Volt-VAR *** be able to consider the uncertainties,Probability Density Function(PDF)curve was discretized to represent different scenarios,and the reduction method was utilized to reduce the situations.

关键词： End-user FAHP load uncertainty reactive power smart grid voltage profile

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Comparative study of effectiveness of different var compensation devices in large-scale power networks

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Journal of Central South University 2013年第3期20卷 715-723页

作者： Reza Sirjani Azah Mohamed Hussain Shareef Department of Electrical Electronic and Systems Engineering Universiti KebangsaanBangi 43600Malaysia

A comparison of the effectiveness of installing reactive power compensators,such as shunt capacitors,static var compensators(SVCs),and static synchronous compensators(STATCOMs),was presented in large-scale power networks.A suitable bus was first identified using modal analysis *** single shunt capacitor,single SVC,and single STATCOM were installed separately on the most critical *** effects of the installation of different devices on power loss reduction,voltage profile improvement,and voltage stability margin enhancement were examined and compared for 57-and 118-bus transmission *** comparative study results show that SVC,and STATCOM are expensive compared to shunt capacitor,yet the effect of installing STATCOM is better than SVC and the effect of installing SVC is better than that of shunt capacitor in achieving power loss reduction,voltage profile improvement and voltage stability margin enhancement.

关键词： shunt capacitor static var compensator static synchronous compensator power loss voltage profile voltage stability

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Assessment of the impact of a 10-MW grid-tied solar system on the Libyan grid in terms of the power-protection system stability

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Clean Energy 2023年第2期7卷 389-407页

作者： Feras Alasali Abdelaziz Salah Saidi Naser El-Naily Othman Alsmadi Mohamed Khaleel Ibrahim Ghirani Department of Electrical Engineering Faculty of EngineeringThe Hashemite UniversityPO Box 330127Zarqa 13133Jordan Department of Electrical Engineering King Khalid UniversityAbha PO Box 394Abha City 61411Saudi Arabia Universitéde Tunis El Manar Ecole Nationale d’Ingénieurs de TunisLaboratoire des SystèmesÉlectriquesTunisie Electrical Engineering Department College of Electrical and Electronics Technology-BenghaziBenghaziLibya Electrical Engineering Department Faculty of EngineeringThe University of JordanAmmanJordan Aeronautical Engineering Department College of Civil Aviation MisrataLibya

The energy market in Libya is expected to face substantial changes in the next few years:electrical energy consumption will increase by 50% within the next 4 ***,there is a plan to gradually increase renewable energy sources in the power network by 2030 to 30%.Solar photovoltaic(PV)plants will play a significant role in the energy transition and the mix of energy sources in *** article is a study conducted to investigate the challenges of power-flow management and power protection from integrating PV power plants into the Libyan power *** particular,a simulation model is built for the Kufra PV power plant(10 MW)with eight buses to assess the power network performance in terms of power quality such as voltage profile,power losses and ***,the impact of the PV plant on the short-circuit level and the power-protection system is presented under different operating *** fault ride-through(FRT)is operated using standard ambient temperature and a wide range of irradiation intensity,and is verified by using the Libyan grid *** results show that the integration of the PV plant into the grid has a significant impact on the short-circuit level and the FRT over the different fault levels and locations on the *** initial period of the three-phase fault shows that the PV plant will be disconnected from the grid due to a decrease in the root mean square value voltages where the reactive and active power of the grid reach 938 MVAR and 261 MW,*** results show that increasing the fault level will lead to an increase in injecting the active *** work is considered the first extensive investigation into the challenges of modern power-flow management and power protection for the power network system in Libya.

关键词： photovoltaic renewable energy sources power protection voltage profile fault ride-through

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Smart inverter operation in distribution networks with high penetration of photovoltaic systems

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Journal of Modern Power Systems and Clean Energy 2015年第4期3卷 504-511页

作者： Emilio GHIANI Fabrizio PILO Department of Electrical and Electronic Engineering University of CagliariCagliariItaly

With the growing number and capacity of photovoltaic(PV)installations connected to distribution networks,power quality issues related to voltage regulation are becoming relevant problems for power distribution companies and for PV *** many countries,like Italy,this has required the revision of the standards concerning the connection to the public distribution network of distributed renewable *** new standards require a flexible operation of generation plants that have to be capable to change the active and reactive power dynamically in function of the network parameters(*** and network local voltage)in local control or following external ***,this paper investigates the use of smart inverter in a critical PV installation,where relevant voltage fluctuations exist.A case study,with real network parameters monitoring data and measurements,is discussed in the paper with the aim of showing how‘smart’features of new inverters can be implemented to increase PV plant integration in low voltage distribution networks.

关键词： Distributed generation Photovoltaic installations voltage profile Radial distribution networks Measurements on power systems

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Autotransformer fed traction power supply system: analysis, modeling and simulation

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Global Energy Interconnection 2018年第2期1卷 187-196页

作者： Getachew Biru Worku Asegid Belay Kebede Department of Electrical and Computer Engineering Addis Ababa Institute of Technology

For many decades, Ethiopia had been using a meter gauge railway from Addis Ababa to the red sea port of Djibouti. Currently, the century old railway is completely replaced by a brand new standard gauge electrified railway line aiming to connect the country to the global market by guaranteeing a unified access to different regions of the country. In order to meet modern railway standards, a 1 x 25 kV catenary system is adopted in Ethio-Djibouti railway line corridor. In this paper, an alternative and a more superior 2 x 25 kV traction power supply system is presented. The modeling and analysis of the 2 x 25 kV traction supply system including the traction load, the substation power transformer, the autotransformer(AT), the catenary line impedance, etc., are performed. In addition, in order to validate the benefits of the proposed system, a comparative analysis of the two types of traction power supply arrangement has been conducted using MATLAB simulation. The analysis focuses on evaluating the voltage profiles of both power supply configurations on the basis of BS EN 50163:2004 international standard.

关键词： Renewable energy System planning Traction power supply voltage profile Autotransformer

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