凸极式无刷直流电机全速段复合矢量控制策略

针对非理想正弦型气隙磁密的凸极式(IPM-Type)永磁无刷直流电机(BLDCM),在传统方波电流控制下难以实现全速度范围的最大转矩比(MTPA)控制及换相转矩脉动抑制,提出一种基于机电能量转换理论和转子同步运动相结合,并考虑复杂参数项的复合矢量控制策略,可以直接提取并控制电机定子电流的转矩分量来同时实现这2个控制目标。首先,在不同转速区间选择近似或实际MTPA模式控制电机。其次,考虑到实际运行过程中电机参数容易随着复杂工况而变化,采用简化的可变参数等效辨识及最优分配方案完成矢量控制。所提策略不仅可以使电机在任意速度区间匹配到最优电流参考点,而且提高了闭环动态响应。实验结果验证了方案的有效性和可行性。

Difficulties in Parameters Identification of Traction Transformer Multi-port Equivalent Scheme with Hidden Construction Defect

While modeling a power supply system for an electric railway traction, knowing equivalent circuits of locomotives supplied this way is an essential issue. In alternating current traction, it is important to diagnose inter alia processes taking place in transformers installed on electric vehicles. This article presents specific phenomena occurring during the work of mono-phase, multi-winding, multisystem （systems AC： 50 Hz, 16.7 Hz） laboratory traction transformer. It also shows difficulties encountered during the process of identifying multi-port equivalent scheme＇s elements of the described device, in which a construction defect occurs.

基于北斗卫星系统的发电机进相运行监控系统

介绍了一种基于北斗卫星系统的发电机进相运行稳定性的监控系统,包括北斗卫星系统模块、功角测算模块、参数辨识模块、接口转换模块、显示模块等,采用"考虑磁路饱和的本地发电机功角测算"与"基于系统戴维南等效的参数辨识"结合的方法,形成厂站端的进相运行稳定性监控系统,由于计及了饱和的影响及在线辨识系统参数,相对精度较高,可方便地嵌入到已有的发电机监测系统中,其中功角测算模块、系统戴维南等效参数辨识模块可方便地通过软件编程在已有的监测系统中加以实现。