Fault-Tolerant Control Strategy for Neutral-Point-Clamped Three-Level Inverter

Table 2

Substitution law of voltage vectors.

Region	Voltage vectors
I	[OOO] → [PPP], N-type → P-type
II-1, 3, 5	[OOO] → [PPP], N-type → P-type, [OPN] → [PPO]+ [NON]
II-2, 4, 6	[OOO] → [NNN], P-type → N-type, [OPN] → [PPO]+ [NON]
III	[OOO] → [NNN], P-type → N-type,
IV	[OOO] → [NNN], P-type → N-type
V-1, 3, 5	[OOO] → [NNN], P-type → N-type, [ONP] → [POP]+ [NNO]
V-2, 4, 6	[OOO] → [PPP], N-type → P-type, [OPN] → [POP]+ [NNO]
VI	[OOO] → [PPP], N-type → P-type