Overvoltage mitigation in open-end winding AC motor drives

An over-voltage mitigation technique for open-end winding electrical drives with long power cables is proposed in this paper. In particular, a suitable dwell time is included in the switching patterns of the two inverters to minimize the over-voltage occurring at the stator terminals of this kind of systems. No passive RLC networks are required, thus avoiding additional costs and extra power losses. The proposed approach is first theoretically introduced, then validated by numerical simulations and experimental tests. Finally its effectiveness is compared with that of conventional passive RC filters.