Hybrid Control for Bidirectional Z-Source Inverter for Locomotives

Table 2

Variation of modulation index and voltage stress with frequency with proposed control topology.

Control topology	Low frequency region			Medium frequency region			High frequency region
	Voltage source mode			Simple boost control			Simple boost control			Constant boot control with; third harmonic injection
Frequency (Hz)	10	20	30	40	50	60	61	70	79	61	70	79
	0.26	0.52	0.79	0.96	0.81	0.73	0.73	0.69	0.66	0.8	0.84	0.91
Voltage stress (V)	Low, neglected			1860	2750	3640	3640	4530	5420	3001	3695	4460