# Modelling 3-phase sources by power and connecting together - SimPowerSystems

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Steven Pilkington on 22 Jul 2011
Answered: Joel Van Sickel on 18 Aug 2021
Hi folks!
Little question I hope someone can help me with.
I'm trying to model power converters for wind turbines. I have the phase-to-phase voltage, output current and output power. Is there anyway to fix these in using the three-phase source? My previous efforts have got the voltage almost right but the current becomes strangely small, limiting the output power.
Also, I'm trying to connect the four sources together for rectification at one point. FYI all four sources are identical and in phase. My aim is to have 4 250kW generators summed together for the rectifier to output 1MW.
Any hints and tips on doing this with the SimPowerSystems blockset would be greatly appreciated.
Thanks again! :D
EDIT: I should add that my initial efforts don't seem to add anything above the first source I connect to the rectifier. Connecting more sources in parallel to the central point whch goes to the rectifier (I've used a 3-phase measurement for this) only alters the noise at the peaks slightly

Joel Van Sickel on 18 Aug 2021
Hello,
I realize this answer is too late to be of any use to the asker, but as part of a Matlab Answers cleanup effort, I will be addressing this question:
you cannot fix voltage, current, and power, unless they happen to be exactly what the circuit would provide. You can typically control either voltage or current, and then the other (and in consequence) power is determined by the connect load/circuit. If you have a feedback on your plant, you can control the plant to pull the correct amount of power, or use a controlled load, but barring have control on your source and your load, there is no way to control for everything.
In your case, you can specify a load by input voltage and desired power draw, which could address this issue.
Regards,
Joel

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