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

Kyeong-Hwa Kim; Myung-Joong Youn

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

Kyeong-Hwa Kim

Myung-Joong Youn

Vol. 1, No. 2, pp. 88-98, Oct. 2001

10.6113/JPE.2001.01.2.88

Current control

Stationary reference frame

PM sychoronous motor

Distribance estimation

Time delay control

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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.

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Cite this article

[IEEE Style]

K. Kim and M. Youn, "An Improved Stationary Frame-based Digital Current Control Scheme for a PM Synchoronous Motor," Journal of Power Electronics, vol. 1, no. 2, pp. 88-98, 2001. DOI: 10.6113/JPE.2001.01.2.88.

[ACM Style]

Kyeong-Hwa Kim and Myung-Joong Youn. 2001. An Improved Stationary Frame-based Digital Current Control Scheme for a PM Synchoronous Motor. Journal of Power Electronics, 1, 2, (2001), 88-98. DOI: 10.6113/JPE.2001.01.2.88.