Abb Schweiz Ag

Alessandro Guerriero

Silvio Scaletti

Matteo Gargiulo

Filippo Lalli

Tiberio Bucci

A method for detecting an islanding condition of a grid connected energy conversion system and related DC/AC converter apparatus to optimize performance in terms of preservation of the power quality, provide synchronized frequency perturbation for all the inverters of a plant, provide shut down capability within the time requested by utilities and safety standards and provide immunity to grid frequency fluctuations.

Method for detecting islanding condition for a DC/AC converter apparatus and a DC/AC converter apparatus thereof

A method for detecting earth-fault conditions in a power conversion apparatus including the following steps: acquiring a first detection signal indicative of an earth-leakage current flowing between the power conversion apparatus and the ground; processing the first detection signal to calculate a first processing signal indicative of a time variant component of the earth-leakage current for one or more selected frequency bands of interest; processing the first detection signal to calculate a second processing signal indicative of a time-invariant component of the earth-leakage current; processing the first and second processing signals to calculate a third processing signal indicative of a resistive component of the earth-leakage current; and processing the third processing signal to determine whether earth-fault conditions are present.

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Paglieta, Italy

Alessandro Guerriero