There are two primary conduction modes in both single-phase and three-phase inverters i.e.. 120-degree conduction mode and the 180-degree conduction mode.
In the 180-degree conduction mode, the driven conduction time of each three phase inverter circuit is precisely 180° of the fundamental period. Hence, better voltage utilisation is offered under a three-phase inverter output voltage. Maximum voltage utilisation from a DC source. Maximum fundamental voltage output. High power transfer capability.
Mode 1 operation of a three phase inverter in 180 degree conduction mode Image used courtesy of Rakesh Kumar, Ph.D. Mode 2 corresponds to a 60 to 120 degree period. During this period, the thyristors T1, T2, and T6 are turned on. This can be seen in Fig. 4. On the load side, the current enters phase a and leaves via phase b and phase c.
Mode 3 operation of a three phase inverter in 180 degree conduction mode Image used courtesy of Rakesh Kumar, Ph.D. Mode 4 corresponds to a 180 to 240 degree period. During this period, the thyristors T2, T3, and T4 are turned on. This can be seen in Fig. 6. On the load side, the current enters phase b and leaves via phase a and phase c.
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