基于滑动模态控制的双馈风电机组低电压穿越控制策略的研究  

Research on low voltage ride through control strategies for doubly fed induction generator based on sliding mode control

作　　者：李国庆[1] 钱叶牛[1] 刘旻序[1] 

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012

出　　处：《电力系统保护与控制》2012年第1期5-11,共7页Power System Protection and Control

基　　金：国家电网公司科技项目

摘　　要：针对双馈式风电机组,在分析其动态数学模型的基础上,应用滑动模态控制方法设计出一种新型的低电压穿越控制策略。该方法首先通过选择滑动表面将系统运动过程分成两个阶段(迫近阶段和滑动阶段),然后结合Lyapunov函数和稳定性定理分别设计了不同阶段的控制策略,并结合起来形成最终的五阶控制策略,最后通过忽略定子磁通量的变化设计出简化的三阶控制策略。利用修改的WSCC-9节点系统对所设计的控制策略进行仿真验证,结果表明所设计的控制策略明显优于传统的矢量控制策略,增强了风电机组的低电压穿越能力,同时还提高了风机并网点电压水平,有利于整个系统在故障发生后恢复稳定运行。Based on the analysis of dynamic mathematical models of the doubly fed induction generators, a novel low voltage ride through （LVRT） control strategy is designed by using sliding mode control （SMC）. This method divides the system movement process into two phases of approaching phase and sliding phase by choosing sliding surface. Then combining Function Lyapunov and stability theory, it designs control strategies of every phase respectively and combines them to form the final 5-order LVRT control strategy. Finally, by ignoring stator magnetic flux it designs the simplified 3-order control strategy. The simulation experiment is performed by using the modified WSCC-9 nodes system. The results show that the novel control strategy is better than traditional vector control strategy, strengthening the LVRT capability of wind turbine generators. Moreover, this strategy also improves voltage level at the point of common coupling （PCC） of wind turbine, being beneficial to the whole system recovery after faults.

关 键 词：风力发电 双馈式异步发电机 滑动模态控制 低电压穿越 控制策略 

分 类 号：TM614[电气工程—电力系统及自动化]