基于状态观测器的双馈风电机组变流器开关管开路故障检测

Open-circuited fault detection on switch of convertor in double-fed wind power generator set based on state observer

针对双馈风电机组变流器可靠性较差,一旦变流器开关管发生故障,整个风电机组可能遭到严重损坏甚至导致停机的问题,提出一种基于状态观测器的双馈风电机组转子侧变流器开关管开路故障检测方法.根据双馈风电机组拓扑结构,结合其感应电机和变流器进行整体建模;构建状态观测器以实现对转子侧电流的在线估计并生成残差;将残差与设定的阈值比较,判断是否有故障发生.仿真结果证明该方法可行且有效.

The reliability of the convertors in double-fed wind power generator set is relatively poor. Once the switch of the convertor fails, the entire wind turbine set may be severely damaged or shut down. As to the issues, an open-circuited fault detection method is proposed on the basis of state observer for the switch of rotor-side convertor in double-fed wind power generator set. A whole model is built combining the induction motor and the convertor according to the topology structure of double-fed wind power generator set; a state observer is built to estimate the rotor-side current online, and meanwhile the residuals are generated; the residuals are compared with the threshold values to diagnose whether there exists a fault. The simulation results show that the method is feasible and valid.