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dynamic simulation using bus fault

asked 2018-06-10 01:56:44 -0500

PRIYANKA gravatar image

I have performed dynamic simulation using bus fault at generator bus, as a result, the frequency rises just after the actuation of fault. I am not able to analyze the reason behind. Instead, if I would perform LLG or LG fault on the same bus, the frequency drops just after the fault. Further, I would like to know whether there is any other way by which plot using .outx file can be drawn at single y-axis rather than separate y-axis for each parameter in an individual sheet.

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answered 2018-06-10 18:11:34 -0500

perolofl gravatar image

A three phase fault brings the generator voltage to zero. The generator active electric power is proportional to U*I. So even if the generator current increases during the short circuit the active power becomes zero since voltage is zero (if we ignore the small losses in the generator itself). The turbine power remains constant so the turbine and rotor will accelerate during the three phase short circuit. This is the basics for transient stability. I recommend you to read about "equal area criterion".

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Asked: 2018-06-10 01:56:44 -0500

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Last updated: Jun 10