Adjustable frequency drive system for North Sea gas pipeline

The paper provides a brief history and overview of the 100 million cubic meters of gas per day Troll Project, the largest gas project in Europe with an expected lifetime of 50 years. A system description details the selection of five, 40 MW, 12 pulse variable speed drives for the onshore plant and their accompanying turbo rotor synchronous motors and 5 harmonic filters. We detail our lessons learned during selection of the drives, back to back testing, and compressor string testing on through startup of the unit trains.