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Single-Shunt Measurement of Three-Phase Currents for a Three-Level Inverter under the Low Modulation Index Operation.

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Summary
This summary is machine-generated.

This study presents a novel three-phase current reconstruction method for three-phase three-level PWM inverters operating at low modulation indexes. The technique effectively reconstructs currents using a single shunt in the DC-link, even with limited measurement time.

Keywords:
current reconstructionpower electronicssingle-shuntthree-level invertervector injection

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Area of Science:

  • Electrical Engineering
  • Power Electronics

Background:

  • Three-phase three-level PWM inverters are crucial in power conversion.
  • Accurate current measurement is essential for inverter control, especially at low modulation indexes.
  • Existing methods face challenges due to limited measurement windows and narrow triggering pulses.

Purpose of the Study:

  • To develop a robust three-phase current reconstruction method for low modulation index operation.
  • To address the challenge of insufficient measurement time in three-phase three-level PWM inverters.
  • To enable accurate current sensing using a single shunt in the DC-link.

Main Methods:

  • A novel current reconstruction approach combining collinear vector injection and Space Vector Modulation (SVM) signal shifting.
  • Utilizing a single current sensor placed in the DC-link for measurement.
  • Theoretical analysis and experimental validation of the proposed method.

Main Results:

  • Successfully reconstructed three-phase currents under low modulation index conditions.
  • Overcame the limitations imposed by narrow triggering pulses and reduced measurement time.
  • Demonstrated the effectiveness of the proposed method through laboratory experiments.

Conclusions:

  • The proposed method provides an effective solution for three-phase current reconstruction in PWM inverters operating at low modulation indexes.
  • The technique enhances control accuracy and performance in challenging operating regions.
  • The single-shunt measurement strategy simplifies hardware implementation.