新型的速度自适应观测器在直接转矩控制系统中的应用

实现高性能直接转矩控制系统的重要环节是准确地观测异步电机的定子磁链。文中将一种新型的速度自适应磁链闭环观测器，应用于直接转矩控制系统中，取代了传统的积分器，理论证明该系统是超稳定系统。仿真与实验表明，该方案电机磁链观测精度高，电机参数鲁棒性好，同时基于磁链观测器所设计的速度自适应辨识方案准确性好，收敛速度好，使系统在较低转速下仍能保持优良的性能。本系统针对1．1kW异步电机，采用数字信号处理器DSP（TMS320C32）进行了数字化实现，实时控制 软件是采用C语言和汇编语言混合编程实现的。

Direct Torque Control System of Induction Machine Based on New Speed Adaptive Flux Observer

The performance of the direct torque control method is heavily dependent on the accuracy of the stator flux estimation. The speed adaptive flux observer of an induction motor is proposed to replace the classical pure integrator, which shows excellent performance, especially at low speed operation. The rotor speed is estimated with the adaptive flux observer, the resulting system is verified to be hyperstable with Popov＇s criterion. The sensorless direct torque control system of induction machine has been implemented by using a digital signal processor (TMS320C32) in a 1.1 kW drive, and the control software is written in C and Assemble languages. Simulation and experimentation show that the proposed speed adaptive observer can give rapid and accurate estimation of the rotor speed and stator flux in a wide speed range and the lowest speed of prototype is about 15 r/min.