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  1. dzt

    Voltage and Current Control or Voltage Control only for a Converter within a DC Microgrid System

    Thanks for your help, Comcokid.
  2. dzt

    Voltage and Current Control or Voltage Control only for a Converter within a DC Microgrid System

    Hi, I am researching information to understand better DC microgrids, and at the moment I am reading on different control techniques to control different converters (Buck, Boost, Buck-Boost etc) within the DC microgrid. One method to control a converter within the dc microgrid is Droop control...
  3. dzt

    Damping Factor (or ratio) of a nth Order System

    Thanks for the explanation, xnuke.
  4. dzt

    Damping Factor (or ratio) of a nth Order System

    Hi, I have a query regarding the Damping Ratio of a system. With a 2nd order system the damping ratio, denoted by zeta ζ, is obtained from the denominator of the transfer function, but how do you find and define the damping ratio from a higher order transfer function, please? Especially...
  5. dzt

    3 Phase Instantaneous Voltage Conversion from Line to Phase and Vis-Versa

    Thanks LiteYear and all those who provided help. Those set of equations are useful when one needs to obtain the phase voltages out of the balanced line to line voltages, especially in simulation modeling. The phase voltage sinewaves from the equations are obtained with both magnitude and phase...
  6. dzt

    3 Phase Instantaneous Voltage Conversion from Line to Phase and Vis-Versa

    The images I am talking about in my previous post are the following. I did not manage to upload two images in the post. http://files.engineering.com/getfile.aspx?folder=0b597a56-7f92-47fb-9e1b-ea3e01cff3db&file=Voltages_Function_Model.png...
  7. dzt

    3 Phase Instantaneous Voltage Conversion from Line to Phase and Vis-Versa

    Hi, First of all thanks to all for the information given. I have noticed that some did not manage to obtain waveforms from the equations I have provided. So I modeled the waveforms in Simulink. I have generated the three balanced phase voltage waveforms (Va, Vb, Vc) and obtained the line to...
  8. dzt

    3 Phase Instantaneous Voltage Conversion from Line to Phase and Vis-Versa

    Hi Electricpete and Skogsgurra, Yes, the equations are used in a PWM context. Basically the equations are used in Simulink (Matlab). The line to line voltages are measured from the 3 phase inputs of a rectifier modeled in Simulink. These line to line voltage waveforms are then given as inputs...
  9. dzt

    3 Phase Instantaneous Voltage Conversion from Line to Phase and Vis-Versa

    The equations are used to obtain the phase voltage waveforms from the line voltage waveforms. What I cannot figure out is how are those equations derived mathematically. And how to derive other equations to obtain the line waveforms from the phase waveforms.
  10. dzt

    3 Phase Instantaneous Voltage Conversion from Line to Phase and Vis-Versa

    Hi, Waross, I did not really understand the last part of your post. Va, Vb and Vc are the instantaneous phase voltage waveforms and Vab, Vbc and Vca are the instantaneous line to line voltage waveforms. The magnitude is equal for the phase voltages and equal for the line voltages, but 120...
  11. dzt

    3 Phase Instantaneous Voltage Conversion from Line to Phase and Vis-Versa

    Hi, I have encountered three equations which convert from 3 phase line to line voltages to phase voltages. I mean the complete instantaneous voltages not the magnitude which is calculated by the square-root 3. The equations are: Va = 2/3Vab + 1/3Vbc Vb = 2/3Vbc + 1/3Vca Vc = 2/3Vca + 1/3Vab...
  12. dzt

    Stationary and Rotary Frames

    Great :) Thanks for the great help, xnuke, I really appreciate it.
  13. dzt

    Stationary and Rotary Frames

    Thanks for the answer, xnuke. So if I understood correctly in the case of the Clarke Transformation when it is stated that the transformation converts time domain signals from a stationary 3-phase phase coordinate system (ABC) to a stationary 2-phase coordinate system (αβγ), what is meant is...
  14. dzt

    Stationary and Rotary Frames

    Hi, I have been searching for an explanation for some time online and in books about this, but none offered a clear explanation. Maybe someone here can help me. What does a stationary or a rotary frame mean when applied to Park and Clarke Transformations, please? Thanks

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