基于混合磁链观测器电励磁同步电机矢量控制

Electrically excited synchronous motor vector control based on hybrid air gap flux estimator

针对传统磁链观测器所存在的磁链轨迹非圆形以及不适合电机高速运行等问题,提出了适用于全速范围的新颖的混合气隙磁链观测器,并对其进行了详细的理论分析,阐明了其内部基于滤波器特性的电流—电压模型之间的平滑切换机理。同时引入具有自适应调节中点电位的简化三电平电压空间矢量调制策略,并在此基础上提出新颖的三电平功率变换器相电压重构算法。仿真和实验结果表明:基于新颖的气隙磁链观测器电励磁同步电动机矢量控制解决方案具有优良的控制性能,以及理论与应用价值。

The accurate observer and effective control of the air gap flux for electrically excited synchronous motor have significant influence on the performance improvement of vector control system. A novel hybrid air gap flux estimator suitable for full speed range was put forward and analyzed in detail. It pointed out that the estimator was composed of two estimator models, i.e. current model and voltage model, and they switched smoothly because of their properties of filters. Furthermore, a novel method of voltage estimate at the three-level power inverter was advanced based on the simplified three-level voltage space vector modulation .algorithm strategy of adaptive neutral-point potential control. Both the simulation and experiment resuhs demonstrated that the proposed electrically excited synchronous motor vector control system based on novel air gap flux estimator has excellent control property, and it has pretty high value in theories and applications.