Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Control Strategies for Multilevel APFs Based on the Windowed-FFT and Resonant Controllers

  • Han, Yang (Dept. of Power Electronics, School of Mechatronics Engineering, University of Electronic Science and Technology of China)
  • Received : 2011.10.18
  • Published : 2012.05.20
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Abstract

This paper presents control strategies for cascaded H-bridge multilevel active power filters (APFs). A current loop controller is implemented using a proportional-resonant (PR) regulator, which achieves zero steady-state error at target frequencies. The power balancing mechanism for the dc-link capacitor voltages is analyzed and a voltage balancing controller is presented. To mitigate the picket-fence effect of the conventional FFT algorithm under asynchronous sampling conditions, the Hanning Windowed-FFT algorithm is proposed for reference current generation (RCG). This calculates the frequency, amplitude and phase of individual harmonic components accurately and as a result, selective harmonic compensation (SHC) is achieved. Simulation and experimental results are presented, which verify the validity and effectiveness of the devised control algorithms.

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References

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