A New PWM and Commutation Scheme for One Phase Loss Operation of Three- Phase Isolated Buck Matrix-Type Rectifier

ABSTRACT:

In this paper, another PWM plan and substitution technique is exhibited for one stage misfortune task of three-stage detached buck network type rectifier. With the proposed PWM conspire, the most extreme passable voltage gain for one stage misfortune task can be accomplished, which allows the nonstop activity of the converter to convey 2/3 of evaluated influence and manage the yield voltage with greatest yield voltage drop under 5% of ostensible yield voltage. Likewise, with the proposed compensation technique, a sheltered change from one stage misfortune task to ordinary activity and the other way around can happen with least substitution steps (two-advance) under zero voltage exchanging (ZVS) condition. The execution of the proposed PWM plan and recompense plans with one stage misfortune activity is assessed and checked by reproductions and trials on a 5kW model.

 

CIRCUIT DIAGRAM:

 

 

Fig. 1. ZVS three-phase PWM rectifier.

EXPECTED SIMULATION RESULTS:

 

 Fig. 2. Simulated waveforms for 2/3PO_max, vLL = 480V and ma = 0.75 when “phase C” is shorted at t1 and recovered at t2: (a) input phase voltages, (b) input phase currents, (c) transformer secondary voltage, (d) output of bridge rectifier, (e) output voltage and battery set point, (f) output inductor current.

 CONCLUSION:

In this paper, task of the three-stage separated Buck grid type rectifier under one stage misfortune condition is portrayed and another PWM plan and compensation strategy for the one stage misfortune activity is proposed. With the proposed exchanging plan and compensation technique, two stage replacement with ZVS (here either utilizing ZVS or zero voltage turn-ON) can be acknowledged for one stage misfortune activity and furthermore for the change from typical task to one stage misfortune activity and from one stage misfortune task to ordinary activity. Task and execution of the converter with the proposed PWM and substitution technique are confirmed with reenactment and trial results. In view of the trial results acquired from a 5 Kw model, it is demonstrated that the converter can convey 2/3 of most extreme yield capacity to the heap and direct the yield voltage with greatest voltage drop under 5% of ostensible yield voltage. Current worry of the converter and information current THD and range examination are likewise furnished in the test results with one stage misfortune activity. The generally vast THD (around 40%) is one of the downsides for this converter while working under one stage misfortune condition.

 

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