Harmonic separation from grid voltage using ensemble empiricalmode decomposition and independent component analysis

摘要

Harmonics and subharmonics in power systems distort grid voltage, reduce the qualityrnof power, and affect the security of the power grid. Rapid and accurate harmonicrnseparation from grid voltage is the crucial technology to ensure that power systemsrnoperate safely and stably. The blind source separation method based on independentrncomponent analysis has been used to separate the components of grid voltage. Asrnthe grid voltage is acquired in only a single channel, harmonic separation from itrnis classed as a single‐channel independent component analysis problem. Hence, thisrnpaper proposes a method for the harmonic separation of single‐channel grid voltagernthat combines ensemble empirical‐mode decomposition and FastICA. Comparedrnwith 2 traditional methods, the fast Fourier transform and the discrete waveletrntransform, the proposed method is superior in that it does not require priorrnknowledge of the frequency of the original source, does not feature mode mixing,rnand is more robust against noise. Results obtained from both synthetic and real‐lifernsignals demonstrated the excellent performance of the proposed method.