低开关频率下异步电机电流环的数字控制

发布时间：2018-02-08 09:43

本文关键词： 异步电机电流环数字控制数字控制延时零极点对消电流控制器　出处：《中国电机工程学报》2014年21期 　论文类型：期刊论文

【摘要】：电流环数字控制在异步电机矢量控制系统中占有非常重要的地位,其性能的优劣直接影响电机转矩与磁链解耦控制效果、输出转矩响应速度,甚至牵引变流器异步电机系统稳定性。而在大功率传动系统中,为降低开关器件损耗,牵引变流器开关频率通常较低,从而产生较大数字控制延时,加剧电机定子电流励磁分量与转矩分量之间的耦合程度。为解决上述问题,文章全面分析异步电机耦合因素,结合零极点对消原理提出一种改进型离散电流控制器,在离散时间域下,不仅确保电流环系统具有良好的动态响应,而且可以实现定子电流转矩分量与励磁分量的有效解耦。模型仿真与实验验证了改进型离散电流控制器的有效性与可行性。
[Abstract]:Current loop digital control plays a very important role in the vector control system of asynchronous motor. Its performance directly affects the decoupling control effect of motor torque and flux chain and the output torque response speed. In order to reduce the loss of switching devices, the switching frequency of traction converter is usually lower, which results in a large digital control delay. In order to solve the above problems, the coupling factors of induction motor are analyzed comprehensively, and an improved discrete current controller is proposed based on the principle of zero pole cancellation. In discrete time domain, not only the current loop system has good dynamic response, but also the current loop system has good dynamic response. Furthermore, the stator current torque component and excitation component can be decoupled effectively. The model simulation and experiment verify the effectiveness and feasibility of the improved discrete current controller.
【作者单位】：北京交通大学电气工程学院;
【基金】：国家自然科学基金项目(U1134204) “十二五”国家科技支撑计划重大项目(2011BAG01B05) 北京市交通行业科技项目(2012kj-030x)~~
【分类号】：TM343

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