摘要
在转子磁链坐标系下,以电流控制电压源逆变器供电驱动电机运行。通过在电流内环采用高增益控制器,感应电机模型中的2个定子电流分量可近似为定子参考电流,从而可忽略定子电流动态特性的影响,将以定子电压为控制量的感应电机四阶模型降阶成以定子电流为控制量的二阶模型。采用状态反馈线性化方法求得感应电机的逆系统,将多变量、非线性、强耦合的感应电机动态解耦成转速与转子磁链2个一阶子系统。在此基础上,设计一种积分比例(IP)控制器对解耦子系统进行闭环控制。电流内环采用滞环比较器,直接获得PWM信号,控制逆变器实现电流跟踪,从而使调速系统具有快速的动态响应性能。仿真结果验证所提控制方案的有效性和优越性。
In the rotor-field-oriented frame,the current controlled voltage source inverter is used to drive an induction motor. By using high gain controller in the current inner loop,the two stator current components are regarded as the two stator reference currents approximately. Consequently,the dynamic behavior of the stator current can be ignored and the complex 4th-order induction motor model with stator voltages as control variables is simplified to 2nd-order one with stator currents as control variables. The state feedback linearization method is employed to obtain the inverse system of induction motor. It decouples the multivariable,nonlinear and strongly coupling induction motor into two independent lst-order linear subsystems,to realize the close-loop controls of which,two integral-proportional controllers are designed. The hysteresis-band comparators are used to produce PWM signals for the current reference tracking of inverter,which realizes the fast dynamic response of driving system. Simulation results verify the effectiveness and superiority of the proposed approach.
出处
《电力自动化设备》
EI
CSCD
北大核心
2008年第7期25-28,共4页
Electric Power Automation Equipment
基金
江苏省教育厅自然科学基金项目(06KJB510040)~~
关键词
感应电机
逆系统
电流控制
电压源逆变器
解耦控制
induction motor
inverse system
current control
voltage source inverter
decoupling control
