... Fig. 3 shows a circuit configuration used for the analysis, which corresponds to the one leg ... more ... Fig. 3 shows a circuit configuration used for the analysis, which corresponds to the one leg of the converter in Fig. ... IV. SIMULAION RESULTS A. Operating Performance under a Steady-State Condition Fig. ... B. Operating Performance under a Transient-State Condition Fig. ...
This paper presents the modular multilevel cascade converter based on double-star chopper-cells, ... more This paper presents the modular multilevel cascade converter based on double-star chopper-cells, which is intended for grid connection to medium-voltage power systems without using line-frequency transformers. The converter is characterized by a modular arm structure consisting of cascade connection of multiple bidirectional pulsewidth modulation chopper-cells with floating dc capacitors. This arm structure requires voltage-balancing control of all the dc capacitors. However, the voltage control combining an averaging control with an individual-balancing control imposes certain limitations on operating conditions. This paper proposes an arm-balancing control to achieve voltage balancing under all the operating conditions. The validity of the arm-balancing control as well as the theory developed in this paper is confirmed by computer simulation and experiment.
Abstract The Modular Multilevel Converter (M2C) is an emerging multilevel converter for HVDC and ... more Abstract The Modular Multilevel Converter (M2C) is an emerging multilevel converter for HVDC and FACTS as well as for future AC-fed traction vehicles or medium voltage drives (MVD). A suitable converter model of the Modular Multilevel Converter (M2C) is presented ...
... 10. Simulated waveforms in steady state. ... This demonstrates that the harmonic analysis met... more ... 10. Simulated waveforms in steady state. ... This demonstrates that the harmonic analysis method described in Sections IV and V is correct by assuming a constant ... The harmonics of the converter output voltages are analyzed by the-oretical calculations and dynamic simulations. ...
... For the middle cell, the capacitor is discharged at on-state and charged at off-state when io... more ... For the middle cell, the capacitor is discharged at on-state and charged at off-state when ioa ... no “S = 1” mode when k = 0) if ioa < 0. 3) If uCM is between uCP,avg ... A. Theoretical analysis of voltage fluctuation Although the capacitor voltages of the upper and lower bridges can be ...
... Fig. 3 shows a circuit configuration used for the analysis, which corresponds to the one leg ... more ... Fig. 3 shows a circuit configuration used for the analysis, which corresponds to the one leg of the converter in Fig. ... IV. SIMULAION RESULTS A. Operating Performance under a Steady-State Condition Fig. ... B. Operating Performance under a Transient-State Condition Fig. ...
This paper presents the modular multilevel cascade converter based on double-star chopper-cells, ... more This paper presents the modular multilevel cascade converter based on double-star chopper-cells, which is intended for grid connection to medium-voltage power systems without using line-frequency transformers. The converter is characterized by a modular arm structure consisting of cascade connection of multiple bidirectional pulsewidth modulation chopper-cells with floating dc capacitors. This arm structure requires voltage-balancing control of all the dc capacitors. However, the voltage control combining an averaging control with an individual-balancing control imposes certain limitations on operating conditions. This paper proposes an arm-balancing control to achieve voltage balancing under all the operating conditions. The validity of the arm-balancing control as well as the theory developed in this paper is confirmed by computer simulation and experiment.
Abstract The Modular Multilevel Converter (M2C) is an emerging multilevel converter for HVDC and ... more Abstract The Modular Multilevel Converter (M2C) is an emerging multilevel converter for HVDC and FACTS as well as for future AC-fed traction vehicles or medium voltage drives (MVD). A suitable converter model of the Modular Multilevel Converter (M2C) is presented ...
... 10. Simulated waveforms in steady state. ... This demonstrates that the harmonic analysis met... more ... 10. Simulated waveforms in steady state. ... This demonstrates that the harmonic analysis method described in Sections IV and V is correct by assuming a constant ... The harmonics of the converter output voltages are analyzed by the-oretical calculations and dynamic simulations. ...
... For the middle cell, the capacitor is discharged at on-state and charged at off-state when io... more ... For the middle cell, the capacitor is discharged at on-state and charged at off-state when ioa ... no “S = 1” mode when k = 0) if ioa < 0. 3) If uCM is between uCP,avg ... A. Theoretical analysis of voltage fluctuation Although the capacitor voltages of the upper and lower bridges can be ...
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Papers by Mohamed Razeen