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感应电机全阶磁链观测器设计及其控制性能对比分析 被引量:16
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作者 吴文进 苏建徽 +1 位作者 刘鹏 汪海宁 《电机与控制学报》 EI CSCD 北大核心 2016年第4期78-83,92,共7页
针对以往在感应电机无速度传感器矢量控制中,全阶磁链观测器均是以静止坐标系下状态变量进行设计的,其基于欧拉法的离散化过程估算误差大,若采用梯形法、双线性法或龙格-库塔法,估算误差有所减小,但计算过程复杂,不适宜工程应用。提出... 针对以往在感应电机无速度传感器矢量控制中,全阶磁链观测器均是以静止坐标系下状态变量进行设计的,其基于欧拉法的离散化过程估算误差大,若采用梯形法、双线性法或龙格-库塔法,估算误差有所减小,但计算过程复杂,不适宜工程应用。提出以同步旋转坐标系下的定子电流和转子磁链作为状态变量来设计全阶磁链状态观测器,其离散化过程采用工程上常用的欧拉法,计算量小。同时给出了基于两种坐标系下全阶磁链观测器转速估算自适应律设计方法。仿真分析和实验结果对比表明,在低速和高速状态下,同步旋转坐标系下设计的状态观测器电流和转速估算准确快速,可以明显提高系统控制的精确性和实用性。 展开更多
关键词 感应电机 全阶磁链观测器 离散化过程 静止坐标系 同步旋转坐标系
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Probabilistic model for remain passenger queues at subway station platform
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作者 许心越 刘军 +1 位作者 李海鹰 周艳芳 《Journal of Central South University》 SCIE EI CAS 2013年第3期837-844,共8页
The remain passenger problem at subway station platform was defined initially,and the period variation of remain passenger queues at platform was investigated through arriving and boarding analyses.Taking remain passe... The remain passenger problem at subway station platform was defined initially,and the period variation of remain passenger queues at platform was investigated through arriving and boarding analyses.Taking remain passenger queues at platform as dynamic stochastic process,a new probabilistic queuing method was developed based on probabilistic theory and discrete time Markov chain theory.This model can calculate remain passenger queues while considering different directions.Considering the stable or variable train arriving period and different platform crossing types,a series of model deformation research was carried out.The probabilistic approach allows to capture the cyclic behavior of queues,measures the uncertainty of a queue state prediction by computing the evolution of its probability in time,and gives any temporal distribution of the arrivals.Compared with the actual data,the deviation of experimental results is less than 20%,which shows the efficiency of probabilistic approach clearly. 展开更多
关键词 SUBWAY PLATFORM remain passenger queuing theory probabilistic theory Markov chain
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