Order reduction for brushless doubly-fed wind generators Part two: rationality analysis of reducing order

The stability analysis and control of brushless doubly-fed wind generator is extremely complex due to its multi-time scale nature and high dimensionality.In order to carry out the stability analysis in control design,a common practice is to neglect the very fast transients.However,under what conditions the fast dynamics of brushless doubly-fed wind generator can be neglected is still an important theoretical question to be answered.Based on physical circuit of brushless doubly-fed wind generator including the fast and slow dynamics,the conditions of reducing model order are studied in this paper.The research shows that the result is reasonable and feasible under some acceptable conditions,without causing qualitative error.The conclusions presented in this paper have significance in model reduction and power regulation for brushless doubly-fed wind generator.