9-level PWM inverter with AC-side, multi-winding transformer

The multi-level inverter shown in Figure 7 is a high-power, ultra-low harmonic generating inverter drive. By feeding the DC-stage from winding with different phases, the injected harmonics are minimized at the primary. A 9-level inverter also provides low harmonics at the load. Time-Stamped Bridges are used to model the inverter part while a special decoupling transformer, in conjunction with ARTEMIS, permits full-mode precomputation of this model and allows faster time steps with real-time simulations. This model was run in real-time with a time-step of 75 microseconds on a dual-Xeon-based, 2.4 GHz, RT﷓LAB simulator.

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