新型感应电机自适应观测与滑模控制策略

New controller design for induction motor drives based on adaptive observer and sliding-mode control

基于感应电机在二相坐标下的数学模型,使用滑模变结构与非线性分析方法设计出由1个基于滑模的转矩与磁链控制器和1个速度自适应磁链观测器非线性控制系统.首先以定子电流与定子磁链为状态变量,采用非线性系统分析方法建立误差状态方程,然后在使误差渐近收敛为零的原则下设计滑模流形面,根据Layapunov稳定性条件,推导出电阻估计表达式及用于逆变器输入的定子电压控制规律.利用基于模型参考与状态反馈的速度自适应磁链观测器来完成转速辨识与磁链的准确观测,分析得到观测器的收敛条件及自适应率,证明了其稳定性,其估计值作为滑模控制器的输入完成系统的闭环控制.Matlab的仿真与分析结果证明了控制策略的正确性与有效性.

Proposed a new nonlinear controller, which composed of a sliding-mode controller and a speed adaptive observer, for induction motor （IM） drives on the basis of space vector modulation （SVM） scheme. Firstly, by using the IM model in the stationary reference frame with stator currents and fluxes as state variables, a sliding mode （SM） torque and flux controller was designed in order to track a linear reference model, which had the desired dynamic behaviors of the IM drive system. The SM controller generated the reference voltages for the SVM - PWM inverter to feed the IM. Then, a speed adaptive observer was designed to estimate the flux and the rotor speed. The convergence condition and control law for the estimation algorithm was also obtained by utilizing Lyapunov theory. Computer simulations results verified the effectiveness and correction of the proposed scheme.