Three-phase harmonics measurement method based on mSDFT

This work presents a three-phase harmonics measurement method based on the mSDFT (Modulated Sliding Discrete Fourier Transform) and a variable sampling period technique. The proposal allows measuring the harmonic components of a three-phase signal and computes the corresponding imbalance by estimating its positive, negative and zero sequence. In addition, an adaptive variable sampling period is used in order to obtain a sampling frequency multiple of the main frequency. mSDFT high rejection to distortions in the electrical network and flexibility of proposed method makes it an interesting alternative for the design of grid power monitors.

[1]  Krzysztof Duda,et al.  Accurate, Guaranteed Stable, Sliding Discrete Fourier Transform [DSP Tips & Tricks] , 2010, IEEE Signal Processing Magazine.

[2]  Patricio G. Donato,et al.  Harmonics Measurement With a Modulated Sliding Discrete Fourier Transform Algorithm , 2014, IEEE Transactions on Instrumentation and Measurement.

[3]  Marco Liserre,et al.  New Positive-sequence Voltage Detector for Grid Synchronization of Power Converters under Faulty Grid Conditions , 2006 .

[4]  I. Carugati,et al.  Frequency Adaptive PLL for Polluted Single-Phase Grids , 2012, IEEE Transactions on Power Electronics.

[5]  S. Maestri,et al.  Variable Sampling Period Filter PLL for Distorted Three-Phase Systems , 2012, IEEE Transactions on Power Electronics.

[6]  Irene Yu-Hua Gu,et al.  Signal processing of power quality disturbances , 2006 .

[7]  Frede Blaabjerg,et al.  Overview of Control and Grid Synchronization for Distributed Power Generation Systems , 2006, IEEE Transactions on Industrial Electronics.

[8]  C. L. Fortescue,et al.  Method of symmetrical co-ordinates applied to the solution of polyphase networks , 1918, Proceedings of the American Institute of Electrical Engineers.

[9]  E. Jacobsen,et al.  The sliding DFT , 2003, IEEE Signal Process. Mag..

[10]  Houshang Karimi,et al.  A magnitude/phase-locked loop system based on estimation of frequency and in-phase/quadrature-phase amplitudes , 2004, IEEE Transactions on Industrial Electronics.

[11]  Seung-Ki Sul,et al.  A new phase detecting method for power conversion systems considering distorted conditions in power system , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[12]  I. Carugati,et al.  Synchronization method with variable sampling frequency using Neuronal Networks , 2011, IEEE Latin America Transactions.