{Modelling and analysis of a three phase PWM AC-DC convertor without current sensor}

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Title	{Modelling and analysis of a three phase PWM AC-DC convertor without current sensor}
Publication Type	Conference Paper
Year of Publication	1993
Authors	Pan CT, Chen T.-C.
Conference Name	Electric Power Applications, IEE Proceedings B
ISBN Number	0143-7038 VO - 140
Keywords	duty ratio control law, fixed switching frequency, Harmonic analysis, line frequency, modelling, PI controller, power convertors, Pulse width modulation, regenerative capability, sinusoidal input current, small-signal analysis, space vector representation technique, state space averaging technique, state-space methods, steady-state analysis, three-phase convertor, two-term control, unity power factor, zero output voltage ripple
Abstract	The familiar state space averaging technique for DC-DC convertors is extended for modelling a three-phase AC-DC convertor without current sensor. The space vector representation technique is used to simplify greatly the modelling process without sacrificing the accuracy and valid frequency range. Both steady-state and small-signal analyses are made. The results show that for the proposed duty ratio control law the convertor can achieve an ideal property, namely, sinusoidal input current with unity power factor, zero output voltage ripple resulting from line frequency and fixed switching frequency. Moreover, the convertor also possesses the regenerative capability which is useful for many applications. Finally, some experimental results are presented for verification