Sub-synchronous torsional interaction (SSTI): detailed study and approach for LNG plants

Modern oil and gas plants, especially in LNG, commonly have an island network with large variable-speed drive systems for compression.

This increases the attention paid to the network's electrical quality in terms of harmonic and sub-harmonic current circulation. The latter can reach the gas turbine generator terminals and excite the natural frequency of the rotating train–causing a sub-synchronous torsional interaction that could cause instability, unit trips, or equipment damage.

Baker Hughes has developed a structured and detailed approach to SSTI analysis, available to customer through a comprehensive power system study. And we’ve delivered it for several customer LNG projects around the world.

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