【摘要】 目前的转子磁场定向矢量控制只是实现了异步电动机转速和磁链稳态时的部分解耦。为提高矢量控制的性能,对磁场定向后仍然存在的耦合关系进行了分析,并在此基础上引入非线性补偿设计解耦控制器抵消耦合项的影响,把系统分解成转速和磁链两个独立子系统,实现了异步电机输入输出的动态完全解耦。与传统矢量控制方案的对比表明,所用的方法可以使电机转速不受磁链指令变化的影响,调速系统的性能有了进一步提高。更多还原

【Abstract】 With rotorfieldoriented control (RFOC) of induction motors, asymptotic decoupling of the speed and flux amplitude is achieved only in steady state, i.e., when the flux amplitude is kept constant. A new decoupling control method for induction motors was developed for exact decoupling of the speed and flux in RFOC. The rotorfieldoriented control couplings were analyzed to develop a inputoutput decoupling control. Nonlinear compensation of the coupled RFOC components was used to dynamically decouple the speed and flux in the motor to two independent subsystems in all operating regions. Simulation results show that the motor speed is not affected by changes of the flux reference to remarkably improve the performance. 更多还原