Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Small-Signal Modeling and Control of Three-Phase Bridge Boost Rectifiers under Non-Sinusoidal Conditions

  • Chang, Yuan (School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Jinjun, Liu (School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Xiaoyu, Wang (School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Zhaoan, Wang (School of Electrical Engineering, Xi'an Jiaotong University)
  • Published : 2009.09.20
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Abstract

This paper proposes a systematic approach to the modeling of the small-signal characteristics of three-phase bridge boost rectifiers under non-sinusoidal conditions. The main obstacle to the conventional synchronous d-q frame modeling approach is that it is unable to identify a steady-state under non-sinusoidal conditions. However, for most applications under non-sinusoidal conditions, the current loops of boost rectifiers are designed to have a bandwidth that is much higher than typical harmonics frequencies in order to achieve good current control for these harmonic components. Therefore a quasi-static method is applied to the proposed modeling approach. The converter small-signal characteristics developed from conventional synchronous frame modeling under different operating points are investigated and a worst case point is then located for the current loop design. Both qualitative and quantitative analyses are presented. It is observed that operating points influence the converter low frequency characteristics but hardly affect the dominant poles. The relationship between power stage parameters, system poles and zeroes is also presented which offers good support for the system design. Both the simulation and experimental results verified the analysis and proposed modeling approach. Finally, the practical case of a parallel active power filter is studied to present the modeling approach and the resultant regulator design procedure. The system performance further verifies the whole analysis.

Keywords

References

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