A second-harmonic direct current (DC) ripple compensation technique is presented for a multi-phase, fault-tolerant, permanent magnet machine. The analysis has been undertaken in a general manner for any pair of phases in operation with the remaining phases inactive. The compensation technique determines the required alternating currents in the machine to eliminate the second-harmonic DC-link current, while at the same time minimising the total rms current in the windings. An additional benefit of the compensation technique is a reduction in the magnitude of the electromagnetic torque ripple. Practical results are included from a 70 kW, five-phase generator system to validate the analysis and illustrate the performance of the compensation technique.
- direct current ripple compensation
- electromagnetic torque ripple
- multiphase fault tolerant machines
- permanent magnet machine
- power 70 kW
- second-harmonic DC-link current
Abd Hafez, A. A., Todd, R., Forsyth, A. J., & Cross, A. M. (2011). Direct current ripple compensation for multi-phase fault-tolerant machines. IET Electric Power Applications, 5(1), 28-36. https://doi.org/10.1049/iet-epa.2009.0217