An improved predictive control for three-phase PWM AC/DC converter with low sampling frequency

TitleAn improved predictive control for three-phase PWM AC/DC converter with low sampling frequency
Publication TypeConference Paper
Year of Publication1994
AuthorsChen L, Blaabjerg F, Frederiksen PS
Conference NameIndustrial Electronics, Control and Instrumentation, 1994. IECON '94., 20th International Conference on
ISBN NumberVO - 1
KeywordsAC-DC power convertors, Capacitance, compensation circuit, converter failure, Current control, current-control, DC link, DC voltage ripples, DC-DC power converters, digital simulation, electric current control, Failure analysis, fast dynamic responses, Filters, Frequency conversion, low sampling frequency, phase shift, phase shift correction, power control, power engineering computing, power factor, power factor control, predictive control, Pulse width modulation, Pulse width modulation converters, PWM power convertors, Reactive power, Sampling methods, simulation, small current ripples, small filter capacitance, space vector PWM strategy, three-phase PWM AC/DC converter
AbstractIn this paper an improved predictive current-controlled three-phase PWM AC/DC converter is described. An analysis is given to explain the phase shift caused by the predictive current control for PWM AC/DC converter which, at low sampling frequency, results in a failure of the converter for power factor control. A compensation circuit is then applied to correct the phase shift to ensure the predictive control with high power factor. The space vector PWM strategy is employed to obtain small current and DC voltage ripples as well as high performance. Moreover, an investigation result shows the possibility to apply small filter capacitance in DC link of the designed PWM converter. The simulation results verify a satisfactory performance of the system with nearly unity power factor both in rectifying and regenerating operations at low sampling frequency, small current ripple and fast dynamic responses in the condition of comparatively small DC link capacitance