An Advanced Voltage Control Strategy for Three-Phase Rectifier with Unbalanced AC Voltages in More Electric Aircraft Power System

In the more electric aircraft (MEA) power system, the voltage stabilization of the interface three-phase rectifier is difficult to be achieved due to the wide range varying frequency and the unbalanced amplitude and phase of the output voltage of the AC generator. In this article, an advanced voltage control strategy based on the techniques of the dynamic phase voltages reconstruction and the improved proportional resonant (PR) regulation is proposed. Thanks to the proposed dynamic phase voltages reconstruction algorithm, the phase-locked loop (PLL) is not required, avoiding the risk of PLL instability in the presence of wide range frequency fluctuations. By integrating the improved PR regulator, the error steady-state control of the currents in αβ frame is guaranteed and the negative sequence harmonics are suppressed, which greatly reduces the reactive power and, hence, improves the power factor. Some simulations have been carried out to validate the effectiveness of the proposed strategy.