无刷双馈风力发电机模型降阶 第Ⅱ部分: 模型降阶的合理性分析

无刷双馈风力发电系统是一个多时间尺度高维数系统, 其稳定性分析与控制是非常复杂的. 在实际问题分析中, 具有快变特征的的动态常被略去. 然而, 在什么条件下无刷双馈电机的快动态允许被略去是一个必须回答的理论问题. 以基于物理电路的计及快动态和慢动态的无刷双馈电机模型为基础, 研究了降阶的条件. 研究表明无刷双馈风力发电机在一些可接受的条件下, 降阶是合理的和可行的, 降阶不会引起“质”的错误. 研究结论对简化无刷双馈风力发电机模型以及实现功率调节控制具有重要意义.

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.