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Summary
This summary is machine-generated.

This study introduces a predictive control strategy to eliminate bulky transformers in medium-voltage AC drives. The new method enhances modularity and achieves a low total harmonic distortion (THD) of 2% for improved AC input current.

Keywords:
AC-DC power convertersnonlinear control systemspredictive controltotal harmonic distortion reduction

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Control Systems

Background:

  • Medium-voltage AC drives utilize cascaded H-bridge inverters but traditionally require large, costly multipulse transformers for harmonic compensation and voltage reduction.
  • These transformers limit modularity and add significant bulk and expense to AC drive systems.

Purpose of the Study:

  • To propose and evaluate a control strategy that emulates the harmonic cancellation of multipulse transformers in cascaded H-bridge AC drives.
  • To enhance the modularity and input current quality of medium-voltage AC drives.

Main Methods:

  • A finite control set-model predictive control (FCS-MPC) strategy was developed to replace three-phase diode rectifiers and emulate multipulse transformer functions.
  • Each power cell employs a nonlinear control strategy for independent DC voltage management.
  • The proposed method utilizes conventional input transformers instead of specialized multipulse transformers.

Main Results:

  • The proposed control strategy achieves greater modularity compared to conventional multicell converters.
  • It significantly improves AC input current quality, resulting in a total harmonic distortion (THD) as low as 2%.
  • A unitary displacement power factor and stable system operation for both passive and regenerative loads were experimentally verified.

Conclusions:

  • The FCS-MPC strategy effectively replaces the need for bulky multipulse transformers in cascaded H-bridge AC drives.
  • This approach enhances system modularity, reduces cost and size, and improves overall power quality.
  • The validated control scheme offers a robust solution for medium-voltage AC drive applications.