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Design and Implementation of a GaN-Based Three-Phase Active Power Filter.

Chao-Tsung Ma1, Zhen-Huang Gu1

  • 1Department of Electrical Engineering, CEECS, National United University, Miaoli 36063, Taiwan.

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Summary

This study presents a novel active power filter (APF) using gallium nitride (GaN) HEMTs to improve power quality (PQ) in renewable energy systems. The system effectively compensates for harmonics and reactive power, achieving high efficiency.

Keywords:
active power filter (APF)gallium nitride (GaN)power quality (PQ)power switching device

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Area of Science:

  • Electrical Engineering
  • Power Electronics

Background:

  • Modern power systems, including renewable energy (RE) and manufacturing, face power quality (PQ) degradation due to advanced power converters.
  • Active power filters (APFs) offer a solution by compensating for voltage sags, harmonic currents, current imbalance, and power factor issues.

Purpose of the Study:

  • To demonstrate the design and performance of a digitally controlled 2 kVA three-phase shunt APF system.
  • To utilize gallium nitride (GaN) high electron mobility transistors (HEMTs) for improved system efficiency and performance.
  • To validate the effectiveness of advanced control algorithms for real-time PQ compensation.

Main Methods:

  • Detailed design procedure for a 2 kVA three-phase shunt APF.
  • Implementation of a digital control scheme using a digital signal processor (DSP) and three type II controllers.
  • Performance evaluation through both simulation and hardware testing.

Main Results:

  • Fast and accurate compensation for harmonics, imbalance, and reactive power was achieved.
  • The system demonstrated high efficiency, reaching up to 97.2%, attributed to GaN HEMTs.
  • Feasibility and effectiveness of the proposed APF and control strategy were validated.

Conclusions:

  • The digitally controlled GaN-based APF provides an effective solution for power quality improvement in RE and industrial applications.
  • The use of GaN HEMTs enables high-efficiency operation.
  • The proposed control scheme ensures robust compensation for various power system disturbances.