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This paper presents an online estimation scheme for the identification of distribution power system impedance parameters. The proposed scheme is based on an invasive current injection method. The scheme benefits from a fast and accurate adoptive notch filter for the extraction of the ambient voltages and currents and also a frequency domain least squares estimator. The former enhances the scheme by...
This paper presents an active islanding detection method for grid-connected distributed power generation systems. The proposed scheme is based on an invasive current injection. An impedance estimation module in the frequency domain is introduced to estimate the equivalent impedance seen from the point of common coupling. To do so, a fast and accurate adaptive notch filter is used to extract the ambient...
The number of grid-connected photovoltaic (PV) systems is increasing noticeably. However, the high initial cost of such systems impedes their wide spread commercialization. This paper presents a new multi-string grid-connected converter topology and a simplified control strategy with a minimum number of components that considerably lowers the initial investment and increases the life time of the system...
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