船舶轴带无刷双馈电机并网滑模控制策略研究

Sliding mode control strategy for grid connection of ship shaft brushless doubly-fed generator

为解决船舶轴带无刷双馈电机采用PI并网控制方案时动态响应性能不理想问题,结合滑模控制技术与矢量控制技术,提出基于指数趋近律的并网滑模控制策略。在Simulink平台上,分别对理想情况、电网电压波动、电机参数摄动情况下发电机输出端电压跟踪过程和并网过渡过程进行仿真分析。实验结果表明:滑模控制并网时差额电压几乎为零,功率绕组中无瞬态冲击电流;与传统PI控制方案相比,滑模控制跟踪电网电压的速度更快、精度更高,对参数摄动及外部扰动具有较强的鲁棒性。

At present,the dynamic response of ship shaft brushless doubly-fed generators(BDFGs)is unsatisfactory in the proportional-integral(PI)control of grid connection.In view of this,the paper integrated the sliding mode control and the vector control to develop a sliding mode control strategy for grid connection based on the exponential reaching law.The output voltage tracking and grid-connection transition of the BDFGs were simulated with Simulink under three scenarios:ideal condition,grid voltage fluctuation,and generator parameter perturbation.The experimental results showed that the voltage difference was almost zero in the case of sliding mode control for grid connection and no transient impulse current was detected in power winding.In conclusion,the sliding mode control outperforms the traditional PI control in the speed and accuracy of grid voltage tracking and is robust against parameter perturbation and external disturbance.