Instantaneous harmonic decomposition technique for three‐phase current based on multiple reference coordinates. Issue 4 (27th February 2018)

• Record Type: Journal Article
• Authors: Yi, Peng; Wang, Xinjian; Sun, Zechang
• Is Part Of: IET electric power applications. Volume 12:Issue 4(2018)
• Page Start: 547
• Page End: 556
• Publication Date: 2018-02-27
• Subjects: power system harmonics -- harmonic analysis; instantaneous harmonic decomposition technique -- multiple reference coordinates -- power systems -- nonstationary signal -- three‐phase PMSM currents -- nonstationary process -- instantaneous frequency -- electrical angle; Electric power -- Periodicals; Electric power systems -- Periodicals; 621.305
• DOI: 10.1049/iet-epa.2017.0433
• Languages: English
• ISSNs: 1751-8660

Abstract

Abstract : Current harmonic decomposition is important to power systems. Current signal is classified into stationary and non‐stationary signal according to whether the parameters change with time. This study focuses on the instantaneous harmonic decomposition of three‐phase permanent magnet synchronous motor currents in non‐stationary process. First, based on the definition of the instantaneous frequency in non‐stationary process, the concept of the spatial frequency based on the electrical angle is proposed. Under this definition, the spatial frequency no longer varies with the rotational speed. A new instantaneous harmonic decomposition method based on multiple reference coordinates is then proposed. To verify the effectiveness of the new method, it is used to analyse constructed currents and experimental currents. Finally, the new method is compared with other analysis methods and proved to be the most accurate and effective.