Abstract
A novel rectifier based on a triple line-voltage cascaded VIENNA converter (LVC-VC) was proposed. Compared to the conventional cascaded H-bridge converters, the switch voltage stress is lower, and the numbers of switches and dc capacitors are fewer under similar operating conditions in the proposed new multilevel converter. The modeling and control for the LVC-VC ware presented. Based on the analysis of the operation principle of the new converter, the power factor correction of the proposed converter was realized by employing a traditional one-cycle control strategy. The minimum average value and maximum harmonic components of the dc-link voltages of the three VIENNA rectifier modules ware calculated. Three VIENNA dc-link voltages were unbalanced under the unbalanced load conditions, so the zero sequence current was injected to the three inner currents for balancing three VIENNA dc-link voltages. Simulation and the results of the experiment verified the availability of the new proposed multilevel converter and the effectiveness of the corresponding control strategy applied.
Highlights
Owing to the particular characteristics of withstanding a high voltage and generating nearly sinusoidal waveforms with low electromagnetic interference, a reduced common-mode voltage, and a high efficiency, the “multilevel converters” have aroused strong attention in the power electronics research field [1], and are extremely hopeful for power system applications such as power electronic transformers, static VAR generators, high power high voltage adjustable AC speed drives, etc.The neutral-point clamped converter (NPC) [2], flying capacitor converter (FC), and cascaded H-bridge converter (CHB) [3] are the most common multilevel converter topologies
Enlightened by applications, the bi-directional power flow is not necessarily required, such as in speed regulation the above-mentioned converters, and considering that, in practice, in a lot of industrial applications, with pumps or fans load, this paper proposes a new topology of a unidirectional multilevel converter the bi-directional power flow is not necessarily required, such as in speed regulation with pumps based on line-voltage cascaded three-phase-VIENNA converters (LVC-VC)
Compared to or fans load, this paper proposes a new topology of a unidirectional multilevel converter based conventional three-phase CHB converters, in the proposed new multilevel converters, the switch on line-voltage cascaded three-phase-VIENNA converters (LVC-VC)
Summary
Owing to the particular characteristics of withstanding a high voltage and generating nearly sinusoidal waveforms with low electromagnetic interference, a reduced common-mode voltage, and a high efficiency, the “multilevel converters” have aroused strong attention in the power electronics research field [1], and are extremely hopeful for power system applications such as power electronic transformers, static VAR generators, high power high voltage adjustable AC speed drives, etc. Enlightened by applications, the bi-directional power flow is not necessarily required, such as in speed regulation the above-mentioned converters, and considering that, in practice, in a lot of industrial applications, with pumps or fans load, this paper proposes a new topology of a unidirectional multilevel converter the bi-directional power flow is not necessarily required, such as in speed regulation with pumps based on line-voltage cascaded three-phase-VIENNA converters (LVC-VC). Regarding the total of IGBT and diode losses, because the losses are very few, the conduction losses of the proposed converter are less than the cascaded Hnumbers of switches and dc capacitors are fewer and the high voltage diode conduction losses are very bridge converter. The simulation and experiment are presented to confirm of the academic method
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