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  1. spede

    Compex iteration

    I'm modeling an doubly-fed induction generator (DFIG) (http://www.eng-tips.com/viewthread.cfm?SQID=97962&SPID=237&page=2) with Matlab. My problem is that I need an iteration method to solve a black box model for this non-linear model of the DFIG. The input is a complex number, basically z = x +...
  2. spede

    Finding the rotor voltage for a 1.8 MVA generator

    Thanks Mstrvb19! This was just what I was looking for. The NR-method might do the job, if I can make it work. The matrices concerning the problem are not very easy to solve. But I'll look for the numerical methods section, if I have problems.
  3. spede

    Finding the rotor voltage for a 1.8 MVA generator

    Electricpete, The speed of the machine affects greatly on the behaviour of the machine. However, in a wind mill generator we want a very large operating area with slip values from s = -0.15 to s = 0.15. This is done possible by a large frequency converter connected to the slip rings in the...
  4. spede

    Finding the rotor voltage for a 1.8 MVA generator

    Thanks for the quick answer! However the problem is bit more complicated. The nominal power of the doubly-fed induction generator (DFIG) is 1.8MW and it is designed for a wind power station. So what we need is an output power of 1.8 MW with power factor very close to 1. It is not possible to...
  5. spede

    Finding the rotor voltage for a 1.8 MVA generator

    #1 - What is a doubly-fed generator? The machine is fed through slip-rings in the rotor circuit with a frequency converter. So we have a slip-ring machine and we want to know the right rotor voltage to get the 1.8 MVA to the network.
  6. spede

    Finding the rotor voltage for a 1.8 MVA generator

    I am simulating a 1.8 MVA doubly-fed generator with a FEM-software. My problem is that I need an iteration method for solving the rotor voltage, when we know the output power to the network and the stator voltage. The problem is complicated, because the system is nonlinear and the equivalent...

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