Five-phase five-level open-winding/star-winding inverter drive for low-voltage/high-current applications

Coordinated and fault‐tolerant control of tandem 15‐phase induction motors in ship propulsion system

“…Under reconfiguration control, the decoupling transformation would change from T 15 → 2 into T 10 → 2 by deleting items relating to the disabled windings, shown in the following equation: (see (23)) Some parameters of the reconfigured 10-phase IM are different from those of the 15-phase IM, especially the parameters relating to the decoupling transformation. The mutual inductance in the d-q reference frame for the 15-phase IM is shown in (24), while this parameter changes into (25) for the 10-phase IM…”

“…The converter consists of 15 H bridges, and each H bridge is connected to the two ends of the respective stator phase. The open-end topology [23,24] can give out more voltage levels and make better use of the DC bus voltage than the singleend topology. Fig.…”

“…Owing to changes in parameters (24) and (25) and in relative (20) and (21), the immediate transition of the control from a 15phase IM to a 10-phase IM would result in surge currents in the stator phases, which might trigger the overcurrent protection of the drive system. Therefore, in the experiment, before the reconfiguration control takes effect at the 8th second, converter 1# is powered off for 500 ms to avoid transient surge currents, and then it restarts with 10 symmetrical healthy phases at current rotating speed.…”