An Improved Stationary Frame-based Digital Current Control Scheme for a PM Synchronous Motor

다국어 초록 (Multilingual Abstract)

An improved stationary frame-based digital current control technique for a permanent magnet (PM) synchronous motor is presented Generally, the stationary frame current controller is known to provide the advantage of a simple implementation However, there are some unavoidable limitations such as a steady-state error and a phase delay in the steady-state On the other hand, in the synchronous frame current regulator, the regulated currents are dc quantities and a zero steady-state error can be obtained through the integral control However, the need to transform the signals between the stationary and synchronous frames makes the implementation of a synchronous frame regulator complex Although the PI controller in the stationary frame gives a steady-state error and a phase delay, the control performance can be greatly improved by employing the exact decoupling control inputs for the back EMF, resulting in an ideal steady-state control characteristics irrespective of an operating condition as in the synchronous PI decoupling controller However, its steady-state response may be degraded due to the inexact cancellation inputs under the parameter variations To improve the control performance in the stationary frame, the disturbance is estimated using the time delay control. The proposed scheme is implemented on a PM synchronous motor using DSP TMS320C31 and the effectiveness is verified through the comparative simulations and experiments

목차 (Table of Contents)

• ABSTRACT
  
• 1.Introduction
  
• 2.Modeling of a PM Synchronous Motor and Stationary Frame Current Control
  
• 3.Disturbance Estimation Using Time Delay Control
  
• 4.Stationary Frame Digital Current Control with Feedforward Disturbance Compensation
  
• 5.Simulations and Experimental Results
  
• 6.Conclusions
  
• References