TREND TOWARDS ALL-ELECTRIC PLATFORMS

Offshore oil and gas platforms require prime movers to drive compressors, pumps, and generators. Platforms have traditionally used gas turbines for compressors and pumps, and gas turbines coupled to low-speed (1,800/3,600rpm) induction generators with gearboxes for electricity.

However, since the mid 1990s, the use of electric equipment on platforms has become favored. Companies are switching to electrically driven pumps and compressors on platforms largely due to the reliability and lower initial costs of electric motors compared to gas turbines, and also because they offer higher efficiency, lower emissions, less vibration, less maintenance downtime, lower maintenance cost, and a wider operating range.

Disadvantages of Conventional Electric Solutions
The size, weight, and maintenance of conventional electric generators are significant cost factors for offshore platforms, particularly in deeper waters. The electric generators used are large, heavy, and inefficient compared to the high-speed solution offered by DDS PM motors and generators.

Advantages of DDS Permanent Magnet (PM) Motors
DDS high-speed, PM motors and generators, which are approximately 10 and 20% of the weight and size of conventional electric motors and generators, could save operators tens of millions of dollars in platform construction, equipment installation, and running costs over conventional electric machines.  In addition, DDS high-speed, PM motors and generators run at 10-20% higher efficiencies and do not require a gearbox. Maintenance is also significantly reduced.