Simulation study demonstrates stable DC voltage and suppressed current harmonics in three-phase Vienna rectifiers, highlighting enhanced power predictive control during voltage imbalance.
When a three-phase Vienna rectifier adopts a finite set power predictive control algorithm under voltage imbalance conditions, harmonics will be generated in the AC side current, and the DC output voltage will also fluctuate. Therefore, this article studies the operation law of three-phase Vienna rectifier under three-phase voltage imbalance conditions, and proposes a new power prediction control strategy to eliminate harmonics on the AC side and voltage fluctuations on the DC side. This strategy adopts the second-order generalized integration method to obtain orthogonal voltage signals, and suppresses the second harmonics of the active component and the the reactive component by using different definition methods for instantaneous reactive power. In this situation, the DC bus voltage could be well stabilized, and the current harmonics in AC side could also be seriously reduced Finally, by establishing a simulation model a simulation model on the Matlab/Simulink platform, it was verified that the control strategy can operate stably under three-phase input voltage imbalance.
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Huang et al. (2024) studied this question.
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