Electrical Engineering

Electrical Engineering

  • Shankar Ekkanath Madathil added an answer:
    What is the best software for simulation of Power electronic projects?

    Hi

    What is the best software for simulation of  Power electronic projects such as DC/DC converters with high Input-Output Voltage or Current? I think that MATLAB(Simulink) some times is not good for them.

    Best Regards.

  • Habib Khani added an answer:
    Do you know how to model an earth pit in CYME.Grd software?

    Cyme is a software that analyses the Earth network of a substation

    Habib Khani · Khorasan Institute of Higher Education

    this address is talking about earthing and i'm looking for an project that is done with cyme grd.

  • Where can I find an African power transmission system database?

    I would like simulating short circuit on this network. Let me know the webpage.

    Wellington Maycon S. Bernardes · University of São Paulo

    Dear K. K. Nagarajan and Mostafa Eidiani,

    Thank you so much for help. These files will be useful adding more knowledge.

    What I need is about impedance, generators, transformers data, and so on, of a real system. For example, files similar to power system test case found at https://www.ee.washington.edu/research/pstca/. Up to 20-30 buses is fine. Data from article are welcome too.

  • Naveen Bhatt added an answer:
    Is it possible to have light without electrical power?

    In general, light is produced for household purpose with bulb, CFL, tube, LED etc from electrical power. There is a big portion of world that lives in dark after sun sets. These people do not want electrical power, they want light first.


    Is it possible to create a pollution free light without electric power and without burning something. Light that is sufficient to illuminate a 12 x 12 feet hut without an electricity connection. Light that is very very cheap (not more than $1 per week and 8 hours per day)….Don’t tell solar or known things….suggest something wild…some new idea….innovative…no power only light….Just for the sake of discussion….

    Naveen Bhatt · Bharat Heavy Electricals Limited

    Thanks for sharing...its new for me....

    I will also google it....can you share the documentation available with you

  • Peiman Pourmomen added an answer:
    How can the memristor be useful if most papers use a large voltage swings and small frequencies?

    Hi everybody; my PhD is about Memristor, and I noticed that most papers use large voltage swing and very small frequencies in modelling memristors.

    Thus, I'd like to ask how can the memristor be practically useful if we are using such large voltage swings and small frequencies.

    Peiman Pourmomen · DADS (Design and Analysis of Dependable Systems) Amirkabir University of Technology

          Regarding to threshold behavior of memristor, some how it is better not to react fast to inputs, specially for memories with high access rates such as TLBs, making them more reliable against read disturbance.

  • Shailendra Singh added an answer:
    What would be the suitable areas of research in smart grid?
    I need suggestions for research in smart grid.
    Shailendra Singh · Indian Institute of Technology (Banaras Hindu University) Varanasi

    any topic which you like that makes you smart

  • Shri Ram added an answer:
    I required a MATLAB code for a objective function of multi-objective economic emission dispatch problem. Do you have any algorithms?

    I work on combined economic emission dispatch problem using improved water cycle algorithm. I have required MATLAB code for objective function of multi-objective economic emission dispatch problem any algorithm.

    i ave required multi objective  optimization function with and without constraint

    Shri Ram · Indian Institute of Technology Hyderabad

    You can use the concept of duility. GAMS is the better software for optimization. GAMS can be used as call function in MATLAB code for optimization. 

  • Barrie Gilbert added an answer:
    How to make 1st year electrical engineering student understand voltage, current, resistor?

    How to make 1st year engineering student understand voltage, current, resistor?

    Barrie Gilbert · Analog Devices, Inc.

    Vasile:

    Okay - but have each ant carry an electron on its back!

  • Tiju Baby added an answer:
    How can I associate MATLAB 2015a with .slx and .m files?

    I do not know if the problem is general or not, but it seems like MATLAB 2015a has some issues regarding files association.

    Tiju Baby · albertian institute of science and technology

    create a folder ...and include both files in it,,after that open m file first,, then .slx file so you can run it simultaneously,,,

  • Sumer Can added an answer:
    We bias nmos and pmos in a real chip by using current mirror. But how do we design the reference current source in a IC?

    I am designing a CS Amplifier in CADENCE Virtuoso with 2 nmos and 2pmos.The lower nmos is used for amplification and the upper nmos for casoding.The upper 2 pmos are used for current source and cascoding to improve output resiatance . But how do I bias the upper 3 trasistors in an IC  ? In current mirror i need to give a reference current source .How do we make a reference current source in an IC ?

    Sumer Can · Institute of Electrical and Electronics Engineers

    Dear Omkar,

    If you could send me an email explaining the details of the circuit you are designing I would send you some possible configurations. We can start talking from there. My email is;

    s.can@ieee.org

    Hopefully I can help. Thanks,

    Sumer

  • M. Adly added an answer:
    Is a Quadratic boost converter really advantageous compared to two cascaded boost converters ?

    In two-stage Cascaded Boost converter, there are two switches, but one has low voltage + high current while the second has high voltage + low current. In Quadratic converter, the single switch has high voltage (highest voltage) + high current rating (sum of two switch currents), making the MOSFET more expensive and lossy.

  • Vasile Surducan added an answer:
    What is the best way to dim an LED?

    If i wanted to dim a bank of LED bulbs/lights via a mobile phone, what would be the best method to do that and how do I implement it.

    Vasile Surducan · National Institute for Research and Development of Isotopic and Molecular Technologies

    Please define first "the best way". There isn't such thing. The best way is the way you know.

    One solution is:

    1. open your mobile phone without cracking it

    2. detached the LCD (with the touchscreen) but without the reflectorized foil

    3. supply the  LED with constant current and put it behind the LCD

    4. program various levels of gray on the LCD and your LED will be dimmed accordingly

  • Oğuz Korman added an answer:
    How do you design a PMSG for a wind turbine?
    I"m using MATLAB/ SIMULINK to simulate the mathematical model of a wind turbine. The power output is 12 kw and the rated torque output is 440 Nm at 11m/s wind speed. I want to design a suitable Permanent Magnet Synchronous machine. I aim to interface the model with the grid. The wind turbine is a part of a Solar-Wind-Fuel Cell Hybrid system.
    Oğuz Korman · Istanbul Technical University

    You have to investigate carefully for the design parameters. There are lots of papers about this topic. On the other hand I do not think that the papers that are published are realistic. 

    There are not formulized methods for the design parameters.

    You can use Ansys/Maxwell to simulate the machine and play with the parameters. I suggest you to start with Design of Direct-Driven Permanent-magnet Generators
    for Wind Turbines by Anders Grauers.

  • Bhupendra Desai added an answer:
    Can anyone recommend data acquisition tools to collect velocity, voltage and current from actual driving cycle?

    Now I use Kayaba recorder. Any idea for collecting these data using other data acquisition for Electric Vehicle driving cycle? 

    Thank you

    Bhupendra Desai · Indian Institute of Technology Roorkee

    Thirty years back ,I developed, 8085 based modules to collect data, and store in sequential memory locations for I+,I- and Izero, along with data of hot spot temperature, diff. current etc. hence simple microprocessor module, using interrupt routine using ADC, or microcontroller could solved your problem economically, refer my papers.

  • Vasile Surducan added an answer:
    Which is the best method to supply a 15kW 1-phase load from a 3-phase supply system ?

    Assume that transformer is needed for voltage matching but electrical isolation is not mandatory. It is understood that the line currents on 3-phase will not be balanced, but what is the best compromise method between cost and the magnitude balance ?

    Vasile Surducan · National Institute for Research and Development of Isotopic and Molecular Technologies

    Depending by local standards, perhaps you can split the load? For a standardized 3-phase systems it's allowed to load up to 9KW on a single phase without destroy the balance of the system. Step down 3 phase and AC-DC to AC single phase is nice but definitely is not "a compromise".

  • Nguyễn Thanh Sơn added an answer:
    embedded systems
    Hi,I am new to the group.I am currently working as a software professional in IT
    I want to be a embeddded software developer.Can any one tell me how to step into the embedded field?
    Nguyễn Thanh Sơn · Ho Chi Minh City University of Technology (HCMUT)

    You can start with C language.. and AVR microcontroler.

    And next. You will learn about C++ , Assembly. 

  • Alberto Mannu added an answer:
    What are the features of an energy auditing software?

    Is MS EXCEL more than enough for carrying out the energy audit?

    Excel could work properly for example as datasheet where you collect the data you need for build your energy baseline. You can use it for plot data and find correlation too. What you can't do with Excel is the analysis of building performance, you need a dedicated software for it. 

  • Suman Bhullar added an answer:
    In a load flow of radial distribution system can we generate complex power so that current will become minimum and hence maximum V1?

    I have to develop a load flow model of balanced radial distribution system. I want to apply optimization techniques, so that current becomes minimum and voltage at the receiving will become maximum.

    V2= V1- Ijj Zjj

    where V1= voltage at the sending end node and V2= voltage at the receiving end node;

    Ijj= branch current and Zjj= branch impedance;

    branch current further depends upon complex power and voltage which is assumed to be constant.

    By optimization technique can we generate complex power so that current will become minimum and hence maximum V1?

    What will be the objective function?

    F(x)= Min Ijj?

    Am i right?

    or F(x)= Max

    Suman Bhullar · Thapar University

     Thank u to all of u for sparing time for my query. it is very good platform for researchers to discuss their problems .

  • Jeremy K Chan added an answer:
    How can one interface adc with fpga saprtan 3e?

    How can one interface i2c and spi adc with spartan 3e fpga board?

    Jeremy K Chan · University of Hawai'i System

    Adding to Dominik and Praveen's answers, I'd probably implement a finite state machine in any of those HDL's (I'd probably use Verilog myself).  The state machine would either passively be triggered by your ADC (e.g. parallel interface), or it would have to actively control sampling/conversion of your signal (for SAR ADC's), and then when the ADC has a result, the FSM would read it out via your interface.

    Of the three common interfaces, parallel, I2C, and SPI, SPI would probably be simplest to implement as a prototype.  Unless you have a speed requirement, parallel would be too much wiring at first.  I2C on the other hand, has a full up bidirectional bus protocol with handshaking, too complicated for your first ADC.  

    SPI is pretty much a 'fire away' and 'hope for the best interface' with dedicated transmit and receive lines.  You either get all zeros (or ones sometimes) which means the IC is not talking with you at all; or you get some kind of data which means the IC is talking with you, but something is wrong with bit/clock alignment or a command; and the best case is when you get good data, which means things are working!

    In any case, hopefully you've got a logic analyzer to help you debug the signals.  The cheapest one I've found that works well is Logic from www.saleae.com

  • Petros Aristidou added an answer:
    Can anyone suggest an algorithm for the application of MPC in distribution system?

    Hi

    Can Anyone suggest an easy implemented  algorithm for the application of using Distributed Model Predictive Control for voltage control in Distribution system. A distribution system with Dgs, capacitor bank, storage units, AVR. And is there any way to transfer info between two control models each one controls a specific zone in the system.

    Thanking

    Petros Aristidou · University of Liège

    For more power system oriented applications, check out the following papers. There are many things in their references.

  • Frédéric André added an answer:
    What is the role of space charge density in dielectric barrier discharge?

    what is the role of space charge density or charge accumulation in dielectric barrier discharge? if I have two plates with dielectric of silicon (permittivity =11.68) the thickness of Dielectric is 1 mm and the gap between plates is 2 mm, applied voltage is 1000 volts on one of plates and the other is grounded .the gap filled with argon at atmospheric pressure 

    my Q about value of it and where the maximum value should be? and what happen at breakdown ? and what equation can be related between it and permittivity and finally what is the physic meaning of it?

    Frédéric André · Thales Group

    The physics of high voltage breakdown is very rich. Many phenomena can cause a breakdown and space charge building is suspected to be one of them. Charges (positive or negative) are injected (e.g. Schottky effect) into the dielectric. They drift under the action of the electric field. This process can be very slow and is temperature dependant. This space charge increases locally the electric field in the dielectric. Eventually the electric field can exceed the breakdown threshold.

    This theory is supported by measurement of space charge, e.g. by pyro-electric effect. With time, dielectrics submitted to large voltage accumulate charges. 

    I'm not aware of reliable model for these phenomena. It is reported that charges may exist initially when the material is fabricated,

  • Serkan Aksoy added an answer:
    What is the use of oscillating magnetic field in Atomic magnetometer?

    Most of the Atomic magnetic sensors use two types of field DC and an oscillating field.

    Serkan Aksoy · Gebze Technical University

    http://anibal.gyte.edu.tr/dosya/102/~saksoy/Metal%20Detectors/Advanced%20Metal%20Detectors%20-%20Book.html

  • Julio C. Guerra Justino added an answer:
    Does anyone have the operating characteristics of iron phosphorous battery pack in BYD electric bus?

    I am simulating V2G benefits in modern grid and considered the BYD bus for transportation. The bus is equipped with a 300 kWh Fe (iron phosphorous battery). But there is very much limited information about this battery/cell available on net. i would be grateful if any information related to the operating characteristics like SOC limits, cycle life etc.  

    Julio C. Guerra Justino · Centro Federal de Educação Tecnológica de Minas Gerais

    Very nice, Tariq. You help me too. thanks!

  • Upendra Reddy added an answer:
    Does anyone use dSPACE1103 ?

    Hello. I am using dSPACE 1103  in which the slave DSP is TMS320F240  my query is how can  RTIlib functions be used, and how can a user defined program be written?

    Upendra Reddy · Indian Institute of Technology Guwahati

    Thank you all  for your response.

  • ch Raja added an answer:
    Can anyone describe the closed loop system characteristics by looking at this bode plot?

    The system is highly nonlinear and we want to increase it's closed loop bandwidth. but the system bode is still quite strange and difficult to extract exact bandwidth frequency info. please describe this closed loop behavior and bandwidth frequency.

    ch Raja · Anil Neerukonda Institute of Technology and Sciences

    Bodeplot only for linear time invarient systems. for nonlinear systems bodeplot notapplicable. bez we are ploting bode plot for system tranferfunction

  • Mostafa Eidiani added an answer:
    Do you have a detailed example for a synchronous generator wind turbine with full converter in MATLAB?

    Do you have a detailed example for a synchronous generator wind turbine with full converter in MATLAB?

    Mostafa Eidiani · Khorasan Institute of Higher Education

    Hi

    Please add an answer to this question until 25th April 2015.

  • Mostafa Eidiani added an answer:
    How can I simulate the voltage dependencies of the loads in the load flow calculation in any software?

    How can I simulate the voltage dependencies of the loads in the load flow calculation in any software?

    Mostafa Eidiani · Khorasan Institute of Higher Education

    Hi

    Please add an answer to this question until 25th April 2015.

  • Mostafa Eidiani added an answer:
    Is it possible for me to adjust a WMF file used for background at a later stage?

    In DIgSILENT Power Factory, Is it possible for me to adjust a WMF file used for background at a later stage?

    Mostafa Eidiani · Khorasan Institute of Higher Education

    Hi

    Please add an answer to this question until 25th April 2015.

  • Mostafa Eidiani added an answer:
    How can I use any program for exporting results from different calculations to a file readable by Excel in PSSe or PSAT?

    How can I use any program for exporting results from different calculations to a file readable by Excel in PSSe or PSAT?

    Mostafa Eidiani · Khorasan Institute of Higher Education

    Hi

    Please add an answer to this question until 25th April 2015.

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