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The sensitivity to Power Quality (PQ) disturbances is today increasing in micro grids due to the great economic consequences that PQ disturbances can generate. However, micro grids include several distributed energy resources (DER) interconnected to the grid with static converters that can deteriorate the Power Quality levels. Among DER, wind turbine systems (WTSs) are expected to be widely employed...
This is a companion paper to a paper of the same title, Part I, in which the theoretical aspects of some spectrum estimation methods for the analysis of non-stationary waveform distortions in power systems due to Wind Turbine Systems (WTSs) are analysed. In particular, Part I dealt with sliding window (SW) DFT, some parametric methods (SW Prony and ESPRIT) and some hybrid methods (SW ESPRIT-DFT and...
IEC standards characterize the waveform distortions in power systems with the amplitudes of harmonic and interharmonic groups and subgroups. These groups/subgroups utilise the waveform spectral components obtained by using a fixed frequency resolution DFT; while this choice represents a good compromise among different aims such as the need of good accuracy, simplification and unification. In some...
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