The Transactions of the Korean Institute of Electrical Engineers B (대한전기학회논문지:전기기기및에너지변환시스템부문B)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Analysis and Compensation of Current Sampling Error in Discontinuous PWM Inverter for AC Drive

교류 전동기 구동용 불연속 PWM 인버터의 전류 샘플링 오차 해석 및 보상

  • 송승호 (서울대 대학원 전기공학부 졸업) ;
  • 손요찬 (서울대 대학원 전기공학부) ;
  • 설승기 (서울대 대학원 전기공학부)
  • Published : 1999.09.01
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Abstract

This paper addresses the issue of current sampling in a high performance AC drive system fed by a discontinuous PWM inverter. The effect of the sampling error due to the measurement delay produced by an input stage low pass filter and an A/D converter is described in the case of discontinuous PWM. To compensate for the sampling error, a method to estimate the delay time of the whole measurement system based on the measured current is proposed and its effectiveness is verified by experimental results. The proposed algorithm can automatically estimate the system delay introduced by the low pass filter and the A/D converter at the commissioning stage. By delaying the current sampling by the estimated value, experimental results indicate that more than 50% reduction of current ripple can be achieved.

Keywords

References

  1. IEEE Trans. on Ind. Appl. v.21 Current control of VSI-PWM inverters D.M.Brod;D.W.Novotny
  2. IEEE Trans. on Ind. Appl. v.22 A new sychronous current regulator and an analysis of current-regulated PWM inverters T.M.Rowan;R.J.Kerkman
  3. IEEE Trans. on Ind. Appl. v.27 Digital current regulation of field oriented controlled induction motor based on predictive flux observer L.Ben-Brahim;A.Kawamura
  4. IEEE Trans. on Power Elec. v.13 no.1 Fast current controller in three-phase AD/DC boost converter using d-q axis crosscoupling J.W.Choi;S.K.Sul
  5. Trans. on IEE-Japan v.112-D no.7 Digital current control method of induction motor using synchronous current detection with PWM signals Y.Yamamoto;T.Kodama;T.Yamada;T.Ihioka;T.Niwa
  6. Conf. Rec. of IAS'97 Sampling of discontinuous voltage and current signals in electrical drives a system approach V.Blasko;V.Kaura;W.Niewiadomski
  7. IEEE Trans. on Ind. Appl. v.34 no.2 Analysis and compensation of current measurement error in vector-controlled AC motor drives D.W.Chung;S.K.Sul
  8. IEEE Trans. on Ind. Appl. v.30 no.3 Implementation of discretetime field-oriented current control R.B.Sepe;J.H.Lang
  9. Conf. Rec. of IAS'96 Current measurement of digital field oriented control S.H.Song;J.W.Choi;S.K.Sul
  10. Conf. Ref. of PESC'97 Minimum-loss PWM strategy for 3-phase PWM rectifier D.W.Chung;S.K.Sul
  11. Conf. Rec. of EPE'91 v.3 Analysis of the harmonics in voltage fed inverter drives caused by PWM schemes with discontinuous switching operation H.W.Van der Broeck
  12. Conf. Rec. of APEC'99 Analysis and Compensation of Current Sampling Error in AC Drive with Discontinuous PWM Y.C.Son;S.H.Song;S.K.Sul