Online observation and compensation of voltage distortion in PWM VSI for PMSM

In general, there exists a voltage difference between the reference and the output voltages in a pulse-width-modulated (PWM) voltage-source inverter (VSI). This difference or distortion is caused partly by the intended blanking time and partly by the inherent characteristics of the switching devices, which are dependent on the operating conditions. The voltage distortion in a PWM VSI is analysed and a new online estimation method for a permanent magnet synchronous motor (PMSM) is proposed to compensate for the time-varying voltage distortion. This new estimation method is not based on a direct voltage observation but on an indirect observation of the intermediate parameter, and the voltage distortion and the compensation voltage are calculated from this intermediate parameter. The former method gives an observation delay due to the lowpass filter, however, the latter method gives almost the same results as the real one.

[1]  Frede Blaabjerg,et al.  Improved modulation techniques for PWM-VSI drives , 1997, IEEE Trans. Ind. Electron..

[2]  V. Blasko,et al.  Analysis of a hybrid PWM based on modified space vector and triangle comparison methods , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[3]  Paul C. Krause,et al.  Analysis of electric machinery , 1987 .

[4]  Marian P. Kazmierkowski,et al.  Current control techniques for three-phase voltage-source PWM converters: a survey , 1998, IEEE Trans. Ind. Electron..

[5]  Yoshihiro Murai,et al.  Waveform Distortion and Correction Circuit for PWM Inverters with Switching Lag-Times , 1987, IEEE Transactions on Industry Applications.

[6]  Hyun-Soo Kim,et al.  On-line dead-time compensation method based on time delay control , 2003, IEEE Trans. Control. Syst. Technol..

[7]  J. Holtz,et al.  Sensorless vector control of induction motors at very low speed using a nonlinear inverter model and parameter identification , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[8]  Seung-Ki Sul,et al.  Inverter output voltage synthesis using novel dead time compensation , 1996 .

[9]  Thomas A. Lipo,et al.  On-line dead-time compensation technique for open-loop PWM-VSI drives , 1999 .

[10]  Kyeong-Hwa Kim,et al.  A simple and robust digital current control scheme of a permanent magnet synchronous motor using time delay control approach , 1999 .

[11]  Pyung Hun Chang,et al.  A model reference observer for time-delay control and its application to robot trajectory control , 1994, IEEE Trans. Control. Syst. Technol..

[12]  K. Kamiyama,et al.  Fully digital, vector-controlled PWM VSI-fed AC drives with an inverter dead-time compensation strategy , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[13]  Kyeong-Hwa Kim.  Design and performance comparison of a stationary frame digital current control for a PM synchronous motor , 2003 .