检索结果-内蒙古大学图书馆

2018 IEEE PES Transmission and Distribution Conference and Exhibition - Latin America, T and D-LA

作者： Lima, Erica Mangueira De Almeida Coelho, Rodrigo Brito, Nubia Silva Dantas Alencar De Souza, Benemar Electrical Engineering Post Graduate Program Federal University of Campina Grande Campina Grande Brazil

ISBN: (纸本)9781538658444

A high impedance fault (HIF) detection method is proposed in this paper. Several parameters are extracted using the Stockwell transform, which is a relatively new multi-resolution tool with the ability to provide good resolution on both time and frequency domain, simultaneously. Those parameters are used to identify a HIF occurrence and distinguish it from other common disturbances such as capacitor banks switching, feeder energizing and solid faults. Two databases are used to validate the method, one with simulated data and one with real HIF oscillographic records, obtained from field experiments. A brief analysis of parameters behavior is also presented, since it is necessary for method's development. Results show the method is able to detect HIF on both simulated and real data in viable time, using only the substation as observation point. Also it can distinguish the fault from other tested disturbances. © 2018 IEEE.

关键词： Frequency domain analysis

来源：评论

学校读者我要写书评

暂无评论

Design and analysis of a bidirectional battery charger 8

Design and analysis of a bidirectional battery charger

引用

8th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2017

作者： Carvalho, Edivan Laercio Carati, Emerson Giovani Da Costa, Jean Patric De Oliveira Stein, Carlos Marcelo Cardoso, Rafael Federal University of Technology-Paraná-UTFPR Post-Graduation Program in Electrical Engineering-PPGEE Static Power Converters Engineering Research Group-ECEE Pato Branco-PR Brazil

ISBN: (纸本)9781509053384

This work proposes the design and analysis of a bidirectional and isolated battery charger for applications that involve energy storage like UPS or hybrid generation systems. Bidirectional characteristic is fundamental to allow the charge and discharge of batteries in a single equipment, reducing the number of systems and volume in applications that involve energy storage. In addition, the proposed converter provides low voltage and current ripple that are important to reduce electromagnetic interference and to improve the battery life cycle, as well as reducing semiconductors requirements. © 2017 IEEE.

关键词： Charging (batteries)

来源：评论

学校读者我要写书评

暂无评论

Inductive Voltage Transformer Model for High-Frequency Studies 8

Inductive Voltage Transformer Model for High-Frequency Studi...

引用

8th Workshop on Communication Networks and Power Systems, WCNPS 2023

作者： Mendes, Erico E. B. Assis, Ana Clara S. Pinto, Marcello H. M. De Conti, Alberto Ufmg - Universidade Federal de Minas Gerais PPGEE/UFMG - Graduate Program in Electrical Engineering Lrc - Lightning Research Center Brazil

ISBN: (纸本)9798350343571

A wideband black-box model is proposed to represent the transient response of an inductive voltage transformer used in 15-kV class distribution systems in Brazil. The proposed model is used to evaluate the surge transfer characteristics of the voltage transformer considering different loads for the application of a step-like impulse voltage at primary side. The model is built as a Norton-type equivalent circuit that is valid from 10 Hz to 10 MHz. It is demonstrated that the model is able to accurately reproduce the transient waveforms measured at the transformer secondary side for the application of impulse voltages at the primary side in all tested cases. © 2023 IEEE.

关键词： Equivalent circuits

来源：评论

学校读者我要写书评

暂无评论

Modeling and control of the modular multilevel cascade converter based on chopper-cells for grid-connected photovoltaic systems 7

Modeling and control of the modular multilevel cascade conve...

引用

7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015

作者： Luna, Bruno Emmanuel De O. B. Jacobina, Cursino B. Oliveira, Alexandre C. Da Silva, Italo Roger F. M. P. Post-graduate Program in Electrical Engineering - PPgEE/COPELE Aprígio Veloso 882 Campina Grande-PB58429-900 Brazil Aprígio Veloso 882 Campina Grande-PB58429-900 Brazil

ISBN: (纸本)9781467371506

This paper presents a modular multilevel cascade converter (MMCC) based on chopper-cells for a grid-connected photovoltaic (PV) application suitable to medium and high voltage systems without line-frequency transformers. This converter is characterized by a modular arm structure composed by cascaded chopper-cells with floating dc capacitors, each one connected to a photovoltaic panel. This paper proposes a continuous model and a control method to achieve independent voltage control of all the floating dc capacitors, enabling the tracking of the maximum power point for each photovoltaic panel. The validity of the theory is confirmed by simulation and experiment. © 2015 IEEE.

关键词： Choppers (circuits)

来源：评论

学校读者我要写书评

暂无评论

An automatic voltage disturbance classification system based on Clonal Selection Algorithm

An automatic voltage disturbance classification system based...

引用

2015 IEEE International Instrumentation and Measurement Technology Conference, I2MTC 2015

作者： De Souza Arruda, Bruno Willian Freire, Raimundo Carlos Silverio De Souza, Cleonilson Protasio Post-Graduate Program in Electrical Engineering - PPgEE - COPELE Department of Electrical Engineering Federal University of Campina Grande - UFCG Campina Grande Paraíba Brazil Center of Renewable and Alternative Energy Department of Electrical Engineering Federal University of Paraíba João Pessoa Paraíba Brazil

ISBN: (纸本)9781479961139

Classification of voltage disturbances in power systems is essential for modern society and can be very demanding according to the used method or the aimed accuracy. This paper presents a new intelligent approach aimed to automatically analyse power quality disturbances including sag, swell, outage, harmonics and normal waveform. The approach is based on Artificial Immune System and focuses on the application of a Clonal Selection Algorithm to extract features from disturbance waveforms and classify the disturbances in each 0.5 cycle of the fundamental frequency. Other important feature of the proposed approach is that it can be embedded since the resulted on-line classification tool achieves very low computational complexity. Comparisons and experimental results obtained from the application of the proposed method validate the approach and achieved a classification accuracy at least better than previous work. © 2015 IEEE.

关键词： Power quality

来源：评论

学校读者我要写书评

暂无评论

Real-time load forecasting for demand side management with only a few days of history available

Real-time load forecasting for demand side management with o...

引用

2013 4th International Conference on Power engineering, Energy and electrical Drives, POWERENG 2013

作者： Neusser, Lukas Canha, Luciane Neves Post Graduate Program in Electrical Engineering Federal University of Santa Maria - UFSM Santa-Maria Brazil

ISBN: (纸本)9781467363921

The penetration of distributed generation is growing, and today it is not unusual to see at the same site, equipment that consumes energy working side by side with power sources. To manage and optimize the use of every resource, and to avoid unbalances when the system operates near its limits, the need for very short-term load forecasting is inevitable. In this paper, the use of an already known, fast forecast algorithm, based on double seasonal exponential smoothing is proposed. His real-time usability, with only limited historical data are tested, and the mechanism behind to achieve that are explained. Results, the functionality and reliability on a real world system are also presented and discussed, leading to some concluding remarks at the end of the paper. © 2013 IEEE.

关键词： Forecasting

来源：评论

学校读者我要写书评

暂无评论

Bidirectional battery charger with planar transformer

Bidirectional battery charger with planar transformer

引用

2013 12th Brazilian Power Electronics Conference, COBEP 2013

作者： Dalla Vecchia Rocha, Fabio Carati, Emerson Giovani Cardoso, Rafael De Oliveira Stein, Carlos Marcelo UTFPR - Federal University of Technology - Paraná PPGEE - Graduate Program in Electrical Engineering Via do Conhecimento Km 1 Pato Branco - Paraná Brazil

ISBN: (纸本)9781479902729

This paper presents a proposal for Isolated Bidirectional battery charger. The charger in study has capacity to supply power 1.34KVA in a line of 400V DC and battery charging capability up to 5A at 192Vnom. For isolation of the batteries and improve energy efficiency in the conversion was used Planar transformer coupled to the switching transistors IGBTs for low losses. To control the energy flow in both directions was used Full-Bridge Converter suitable for the power level required at 400V bus. The charging of the batteries can be integrated into a network-smart grid, composed of renewable energy sources like photovoltaic and / or wind, or be used in UPS systems 'double conversion', whose load is less fault tolerant power. © 2013 IEEE.

关键词： Charging (batteries)

来源：评论

学校读者我要写书评

暂无评论

Small-signal modeling and analysis of an isolated bidirectional battery charger 13

Small-signal modeling and analysis of an isolated bidirectio...

引用

13th IEEE International Conference on Industry Applications, INDUSCON 2018

作者： Carvalho, Edivan Laercio Carati, Emerson Da Costa, Jean Patric De Stein, Carlos Marcelo Oliveira Cardoso, Rafael Federal University of Technology - Paraná - UTFPR Pato Branco - PR Brazil Post-Graduation Program in Electrical Engineering - PPGEE Static Power Converters Engineering Research Group - ECEE Brazil

ISBN: (纸本)9781538679951

This paper presents the small-signal modeling and analysis of an isolated bidirectional DC-DC converter. The converter is implement based on two Full-Bridge converters. The system is designed to act as a charge/discharge controller for battery banks. The model for each mode of operation is developed using the average state-space model approach. To verify the models, simulations are performed using PSIM software in addition to experimental results obtained from a 200 W prototype that connects a 60 V battery bank to a 230 V DC link. © 2018 IEEE.

关键词： DC-DC converters

来源：评论

学校读者我要写书评

暂无评论

Closed-loop Frequency Data-driven PID Retuning 2

Closed-loop Frequency Data-driven PID Retuning

引用

2nd IEEE Conference on Control Technology and Applications, CCTA 2018

作者： Da Silva Moreira, Lucas José Acioli, George Barros, Péricles Rezende Post-Graduate Program in Electrical Engineering PPgEE COPELE Federal University of Campina Grande UFCG Campina Grande PB58429-900 Brazil Electrical Engineering Department DEE Federal University of Campina Grande UFCG Campina Grande PB58429-900 Brazil

ISBN: (纸本)9781538676981

This paper is about a data-driven frequency domain PID retuning from the initial controller parameters. It uses data collected from a specific closed-loop experiment to estimate frequency response points. The data-driven retuning method is applied to make a process matches with the defined reference model using a convex optimization technique that minimizes modified cost function. The proposed strategy is demonstrated in laboratory scale thermal plant based on Peltier effect, using crossover and critical frequencies estimations. © 2018 IEEE.

关键词： Frequency estimation

来源：评论

学校读者我要写书评

暂无评论

Transmission of real-time video signal with interference density and human traffic

引用

Telkomnika (Telecommunication Computing Electronics and Control) 2015年第4期13卷 1352-1360页

作者： Bahaweres, Rizal Broer Karya, Oki Teguh Alaydrus, Mudrik Post-Graduate Program of Electrical Engineering Departement Mercu Buana University Indonesia KompasTV Indonesia Faculty of Science and Technology State Islamic University Syarif Hidayatullah Jakarta Indonesia

The use of mobile phone as a communication tool rapidly increases, as well as various types of functions therein. Among of the many applications on the mobile phone, which are used skype androidbased for teleconferencing via mobile phone. Things can not be separated from these applications is the need of qualified internet network access for these applications can be felt up function. One of the network access to the Internet is widely used today's society is a wi-fi network. Access to the Internet does not always provide the best performance, this is due to many factors, one of which is the presence of interference. In this study, we tested transmission of video signals in real-time using an application skype on the mobile phone. Skype run on wi-fi network, which is influenced by the presence of interference or objects such as human traffic in the network. Wireshark were used to obtain data reliability wi-fi network, known as QoS. While evalvid used to obtain the data QoE restricted only get the data PSNR (Peak Signal To Noise Ratio) and MSE (Mean Square Error). © 2015 Universitas Ahmad Dahlan.

关键词： Wi-Fi

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：