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Hybrid Space Vector PWM Strategy for Three-Phase VIENNA Rectifiers.

Yaodong Wang^1,2, Yinghui Li², Xu Guo^1,2

¹Aviation Engineering School, Air Force Engineering University, Xi'an 710038, China.

Sensors (Basel, Switzerland)

|September 9, 2022

Summary

This study introduces an improved hybrid modulation strategy for Vienna rectifiers to address current distortion and midpoint imbalance. The new method enhances current crossing distortion and ensures midpoint potential balance, validated by simulation and experiment.

Keywords:

Vienna rectifier current distortion discontinuous pulse width modulation space vector pulse width modulation

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Area of Science:

Power Electronics
Electrical Engineering
Control Systems

Background:

Vienna rectifiers are essential in power electronics but suffer from zero-crossing current distortion and midpoint potential imbalance.
These issues degrade performance and efficiency in power conversion systems.

Purpose of the Study:

To propose an improved hybrid modulation strategy for Vienna rectifiers.
To effectively suppress zero-crossing current distortion and achieve midpoint potential balance.

Main Methods:

A dynamic current crossing distortion sector is identified based on phase differences between voltage and current vectors.
Discontinuous pulse width modulation (DPWM) is applied within this sector to mitigate vector mutations and improve current distortion.
Space vector modulation (SVM) is utilized outside the sector, incorporating a voltage balance factor to control midpoint potential.

Main Results:

The proposed hybrid modulation strategy successfully suppresses redundant small vector mutations during current crossing.
Significant improvements in current crossing distortion were observed.
Effective control of midpoint potential balance was achieved through the SVM strategy.

Conclusions:

The improved hybrid modulation strategy offers a viable solution to the inherent problems of Vienna rectifiers.
The method enhances both current quality and midpoint potential stability, validated through simulations and experimental results.