DSP-Based SiC-MOSFET SAPF With 100-kHz Sampling and Switching Frequency for Wideband Harmonic Suppression

Abstract

In this article, 100-kHz sampling and switching frequency shunt active power filter (SAPF), which is based on a dual-core DSP TMS320F28377D, is designed for the potential market of high-frequency harmonic suppression in more electric aircraft (MEA) or high-speed train (HST). By utilizing the multithreading and multiprocessing method, different computation segments, such as analog-to-digital conversion, recursive discrete Fourier transform (RDFT), and inner loop current and outer loop voltage control, can be rearranged as several parallel operation groups. Compared with the traditional single pipeline structure of the mostly 10–20 kHz switching frequency commercial SAPF, this parallel execution speeds up the signal processing so that the highly increased sampling frequency makes the current control loop reaches wider bandwidth even with simple proportional integral (PI) regulator. Meanwhile, for wideband harmonic suppression, a multiresolution RDFT strategy is proposed to extend the range of the selected harmonic without sacrificing its extraction accuracy. After raising the sampling frequency to 100 kHz, the proposed SAPF with much easier current controller could suppress wider frequency harmonics than other 10–20 kHz SAPF. A 10- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text {kV}\cdot \text {A}$ </tex-math></inline-formula> prototype with CREE SiC power module CCS050M12CM2 is set up to verify its effectiveness. The result complies with the IEEE standard 519-2014.