感应电机离散变频磁链控制策略  

Flux Control Strategy of Induction Motor Discrete Variable Frequency

作　　者：谢仕宏[1] 孟彦京[1] 李宏涛 马汇海[1] 陈君[2] Xie Shihong;Meng Yanjing;Li Hongtao;Ma Huihai;Chen Jun(College of Electrical and Control Engineering Shaanxi University of Science and Technology Xi’an 710021 China;China Shipbuilding Industry Corporation NO.710 Institute Yichang 443003 China)

机构地区：[1]陕西科技大学电气与控制工程学院,西安710021 [2]中国船舶重工集团公司第七一〇研究所,宜昌443003

出　　处：《电工技术学报》2019年第11期2354-2363,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金项目(51577110);陕西省科学技术厅项目(2017GY-047)资助

摘　　要：提出一种基于空间电压矢量的感应电机离散变频磁链控制策略。首先分析三相晶闸管电路两相导通时电压矢量对感应电机磁链轨迹的影响,找出基于离散变频控制的感应电机转矩脉动的原因;其次,建立三相晶闸管电路两相导通时感应电机动态数学模型,得到定子磁链方程,并计算三相晶闸管电路都关断时定子磁链衰减量;最后给出所提控制策略的实现方法。研究结果表明,反向作用电压矢量是造成感应电机转矩脉动的主要原因,所提方法能消除反向作用电压矢量,与传统方法相比最大起动电流降低46%。实验结果验证了上述结论。One innovative flux control strategy of induction motor discrete variable frequency(DVF)based on space voltage vector was proposed.Firstly,space voltage vector’s influence on induction motor stator flux was analyzed on condition that two of three-phase thyristor circuits were conductive,and the cause of torque shaking was also discovered while the motor was driven by DVF.Then,under the same circuit structure as above,induction motor dynamic model was constructed.In virtue of the model,it was easy to obtain stator flux equations,and it was not difficult to calculate stator flux decrement while three-phase thyristor circuits were all turn-off.Finally,implementation method of the innovative strategy was presented.Study results show that:The reverse space voltage vector is the main cause of induction motor torque shaking drastically;the proposed strategy can eliminate the reverse space voltage vector and the start current of induction motor is decreased by 46%contrasting with the traditional method.The experimental results verified these conclusions.

关 键 词：感应电机 离散变频 电压矢量 磁链控制 软起动 

分 类 号：TM921[电气工程—电力电子与电力传动]