A Novel Six-Band Hysteresis Control for the PackedU Cells Seven-Level Converter: Experimental Validation

ABSTRACT:

 In this paper, the authors propose a novel six-band hysteresis technique to efficiently control the seven-level packed U cells (PUC) converter. The proposed PUC combines advantages of the flying capacitor and the cascaded H-bridge topologies. The novel control strategy is proposed in order to insure a good operation of the PUC converter in both inverter and rectifier modes. In case of rectifier operation, the proposed six-band controller is designed to draw a sinusoidal line current (load current in case of inverter operation) with a unity power factor. Harmonics contents of line current (or load current) and rectifier input voltage (or inverter output voltage) are very low which permits the reduction of the active and passive filters ratings resulting on a very high energetic efficiency and a reduced installation cost. The proposed concept was validated through experimental implementation using real-time controller, the DS1103 of dSpace.

KEYWORDS:

 

1.      Active rectifier

2.      Harmonic reduction

3.       Hysteresis

4.      Inverter

5.      Multilevel converters

6.      Packed U cells (PUC)

SOFTWARE: MATLAB/SIMULINK

 CONCLUSION:

A novel six-band hysteresis control technique for the seven level PUC converter is presented in this paper. The proposed controller allows a nearly sinusoidal current both in rectifier or inverter operation. The DC link buses voltages are well controlled and track their references even under 100% of load steps. The rectifier input voltage or the inverter output voltage has seven-level voltages which permit to reduce the rating of active and passive filters resulting on a very high energetic efficiency and a reduced installation cost. The good dynamics of the system prove the efficiency of the proposed controller.

REFERENCES:

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