Bidirectional‑friendly rectifier control strategy for advanced traction power supply system under unbalanced supply

다국어 초록 (Multilingual Abstract)

A bidirectional-friendly control strategy of three-phase NPC rectifier under unbalanced voltage for advanced traction power supply system (ATPSS) is proposed in this study. Negative-sequence current and DC voltage ripple are restrained effectively with very low total harmonic distortions (THDs) on the basis of predictive current control theory. First, power balance equation containing only positive-sequence voltage of the three-phase grid voltage is derived, and the secondary fluctuation of instantaneous active and reactive powers on the grid side is analyzed and calculated. Second, expression of the DC-side voltage fluctuation is deduced to fix the calculation of Pref for the optimization of the control system. Third, command current that can achieve bidirectional-friendly control is calculated according to the power expression and the reference voltage value is obtained on the basis of the predictive current control principle. Finally, simulations and experimental results verify the correctness of the theoretical analysis and the effectiveness of the proposed strategy.

참고문헌 (Reference)

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