For example there are two three-level NPC H-bridge base units cascade to consist one phase of the large capacity converter the phase output voltage can reach 2×U = 6124.5V , then the output line voltage of three phase converter can reach 3 × 2×U =10607V .When the output current reach 1730A the capacity of the IGCT-based three phase three-level
NPC cascade large power converter reach 30MW