Discrete error suppression method for phase-locked loop of more-electric aircraft power supply system

Abstract

The application discloses a kind of multi-electric aircraft power supply system RGDSS phase-locked loop discrete error suppression method, belong to digital signal processing and power electronic control technical field.The application utilizes recursive general delay signal superposition operator RGDSS to process the voltage signal obtained by coordinate change to three-phase voltage signal, to generate orthogonal fundamental component;Orthogonal fundamental component is based on the smooth frequency estimation value of phase detection and frequency estimation adaptive feedback update corresponding theoretical delay sampling point number in RGDSS;Fractional delay compensation unit based on Thiran all-pass filter construction is used to approximate and compensate the fractional delay part in theoretical delay sampling point number, to effectively suppress the discrete error caused by the non-integer multiple relationship between sampling frequency and fundamental frequency in multi-electric aircraft variable-frequency power grid, improve the precision and robustness of synchronous signal detection under complex working conditions. M Fractional delay compensation unit based on Thiran all-pass filter construction is used to approximate and compensate the fractional delay part in theoretical delay sampling point number, to effectively suppress the discrete error caused by the non-integer multiple relationship between sampling frequency and fundamental frequency in multi-electric aircraft variable-frequency power grid, improve the precision and robustness of synchronous signal detection under complex working conditions.

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