A novel 40-pulse AC-DC converter based on a 20-pulse converter is designed and implemented in this paper. Combining the outputs of two parallel 10-pulse diode bridges, consisting of five legs of diode rectifiers, results in a 20-pulse topology. A zero sequence blocking transformer (ZSBT) is designed and applied to the proposed scheme guarantying the independent operation of the two bridges. To achieve a 40–pulse output, a pulse doubling circuit is applied which is inherently a tapped inter-phase transformer. A T-connected autotransformer platform is designed and added to the converter, making the proposed scheme suitable for retrofit applications. The proposed solution is a tradeoff among the pulse number, the transformer platform, the complexity of the scheme and the cost. The proposed scheme has an optimized configuration in this regard. In this paper, the proposed scheme is simulated by MATLAB/SIMULINK considering different loading scenarios. The simulation results show that the proposed scheme improves the power quality indices and satisfies the IEEE-519 requirements at the point of common coupling (PCC). Also, a laboratory prototype is implemented using the proposed design and the experimental results confirm the simulation results under different loading conditions. The important aspect of the proposed scheme is a considerable reduction in the burdens of the magnetic parts with respect to the nominal load rating which is verified by kVA calculation. This fact indicates a significant improvement in the total cost and space of the proposed configuration in comparison with similar configurations.
کلید واژگان :AC–DC converter, T autotransformer, Power quality, 40-pulse rectifier, Pulse doubling, Direct torque controlled induction motor drive (DTCIMD).
ارزش ریالی : 600000 ریال
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