4.1 Minimization of power loss in the event of a fault with balanced power sharing between the two three-phase windings {1} and {2}Balanced current sharing between the two Three-phase windings {1} and {2} can be made in post-fault conditions by simply setting ki = 1/2. Power sharing coefficient (voltage) kv(2) to synthesize v(2) between the VSIH(2) and VSIL(2) inverters. Subsequently, the use of VSIH(2) and VSIL(2) does not allow optimal obtaining of the loss point of the inverter, when the desired output voltage can be synthesized with a single VSIH(2) or VSIL (2). Therefore, VSIH(1) inverters can propagate with only VSIH(2) and VSIL(2) set to zero voltage output or vice versa, providing exactly the same operating characteristics. Now the open winding configuration collapses into three-phase star connections for the two windings {1} and {2} shown by the space vector equivalent circuit in Fig. 5b. Voltage and power given by Equations 10, Equations 11. and post-fault condition Eqs.12, can further be predicted as:, (17). (18) The prediction (equations 17) will be formulated in numerical simulations to represent the redundancy in post-fault conditions. avoiding additional protection circuits (bypass switches/circuit breakers). This will ensure star connection on the VSIL (2) redundancy of the inverter and also ensure zero circulating current with the DC power supply. 4.2 Balanced power sharing between the healthy VSIH (1) and VSIH (2), VSIL (2) Next step of the investigation focused on the operating condition after fault by equally sharing the total power between the three healthy inverters (VSIH ( 1) and VSIH(2), VSIL(2)). This post-fault behavior is a crucial issue and is recommended for batteries...... middle of paper ...... tolerant operation analysis of a four-inverter multi-phase multi-level AC motor drive » , in Conf. Proc. IEEE-SDEMPED'11, Bologna (IT), pp. 126-132, September 2011.24. G. Grandi, P. Sanjeevikumar, Y. Gritli, F. Filippetti, “Fault-tolerant control strategies for quad-inverter induction motor drives with one failed inverter,” in IEEE Proc. 20th International. Conf. on electrical machines, ICEM'12, Marseille (France), pp. 957–964, September 2-5, 2012.25. G.Grandi, C. Rossi, D. Ostojic, D. Casadei, “A new multilevel conversion framework for grid-connected photovoltaic applications,” IEEE Trans. On Ind. Electron., vol. 56, no. 11, pp. 4416-4426, November 2009.26. G. Grandi, P. Sanjeevikumar, D. Casadei, “Preliminary hardware implementation of a six-phase four-inverter induction motor drive,” in Proc. European Power Electron., and Appl., Conf., EPE'11, Birmingham (United Kingdom), pp. August 1-9, 30-September 1. 2011.