Testing large ASDS

Driving compressors and pumps by means of large Adjustable Speed Drive Systems (ASDS) is increasing in oil and gas applications, specifically for gas/oil transportation, gas liquefaction and gas injection/lift. The importance of the ASDS availability for the plant operability calls for extensive factory testing to uncover any possible hidden weakness of components and system design issues before delivery at site. The complete ASDS line-up shall be full load tested before string test with the compressor/pump to prove system electrical performances, protections and control functionalities. The article focuses on procedures, recommendations and experiences on testing Large Adjustable Speed Drive Systems (ASDS) and it goes through technical challenges to be faced when testing this large equipment. Foundation design, rotor dynamic analysis, but also measurement strategies for distorted load and efficiency calculation are part of the content of this article. Typical testing requirements in accordance to international standards and oil & gas plant specifications are also discussed in terms of practical solutions to be adopted during tests, feasibility basing on ASDS power rating and need for simulations. Real cases testing results and method are also treated in order to give handy information.