Control Strategies for Multilevel APFs Based on the Windowed-FFT and Resonant Controllers

Yang Han

Control Strategies for Multilevel APFs Based on the Windowed-FFT and Resonant Controllers

Yang Han

Vol. 12, No. 3, pp. 509-517, May 2012

10.6113/JPE.2012.12.3.509

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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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Cite this article

[IEEE Style]

Y. Han, "Control Strategies for Multilevel APFs Based on the Windowed-FFT and Resonant Controllers," Journal of Power Electronics, vol. 12, no. 3, pp. 509-517, 2012. DOI: 10.6113/JPE.2012.12.3.509.

[ACM Style]

Yang Han. 2012. Control Strategies for Multilevel APFs Based on the Windowed-FFT and Resonant Controllers. Journal of Power Electronics, 12, 3, (2012), 509-517. DOI: 10.6113/JPE.2012.12.3.509.