An Improved Constant Active Power Control for Three-Phase Buck Rectifier Under Unbalanced Input Voltages and Wide AC Input Frequency

In the application of more electric aircraft (MEA), the active power fluctuation is a challenge for the three-phase buck rectifier (3ph-BR) under unbalanced input voltages due to its wide range of ac input frequency. In order to enhance the performance of 3ph-BR in MEA application, an improved constant active power control strategy for 3ph-BR under unbalanced input voltages and wide ac input frequency is proposed in this brief. By analyzing the instantaneous power in the two-phase stationary frame, an improved algorithm to reconstruct input voltages is proposed to realize constant active power. The proposed control strategy does not require phase-lock loop and therefore can be applied in wide ac input frequency application. Experimental results verify the effectiveness of the proposed control strategy.