In large-capacity permanent magnet synchronous wind generators (PMSGs)
excessive temperature rise induces critical challenges such as insulation degradation and irreversible demagnetization of permanent magnets. This study investigates a 2 MW PMSG and calculates its temperature distribution based on electromagnetic and windage loss coupling analysis. Results indicate that the equivalent thermal network method and unidirectional magneto-thermal coupling model produce considerable calculation errors due to the neglect of multi-factor interactions. To solve this problem
a bidirectional magneto-thermal coupling model is developed
incorporating linear regression and random forest algorithms for accurate temperature prediction and sensitivity analysis. The random forest model demonstrates superior capability in characterizing the nonlinear relationship between winding temperature and influencing factors including wind speed
rotational speed and ambient temperature. Among these factors
rotational speed exhibits the strongest positive correlation with winding temperature rise
followed by wind speed
while ambient temperature has the least influence. Moreover
the variation of winding temperature shows a delayed response
with the shortest latency for wind speed variations
followed by rotational speed changes
and the slowest to ambient temperature fluctuations. Comparative analysis confirms that the random forest model outperforms the linear regression model in prediction accuracy
and the bidirectional coupling simulations align closely with its predictions
whereas unidirectional coupling and thermal network methods show lower accuracy.
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references
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