Electric drive solutions
Driving the main refrigerant compressors, variable-speed
drive systems (VSDS) are at the heart of the E-LNG plant
concept. The system includes simple, robust and lowstressed,
brushless synchronous motors renowned for their
superior reliability and availability in the most demanding
applications in many industries. In fact, Siemens is the
world’s leading supplier of such large drives.
Siemens electric motors for E-LNG compressor drive utilize
established, proven design concepts and materials that
have been used in power generation for decades. Identical
mechanical, thermal and electrical stress levels in both
applications virtually eliminate the risk of “unproven” equipment
application. Variable speed-drive electronic equipment
is actually proven in much higher ratings, e.g. in highvoltage
DC transmission applications. Allowing for a customized
and optimized compressor string design, Siemens
offers electric-drive solutions for E-LNG plants in power
ratings of up to 90 MW and speeds exceeding 3600 rpm.
Backed by decades of
experience in the
design and manufacture
of high-power
rotating electric
machines, Siemens
e-motors provide the
ideal drive solution
for even the largestscale
liquefaction
trains.
Space saving modular designs for every climate zone
Variable-speed drive systems are custom-engineered from
proven modular designs. They are pre-installed and precommissioned
for compressor-string performance tests and rapid on-site installation. Adaptations to local conditions
and project requirements, such as autonomous cooling
systems, are trouble-free as well, reducing EPC costs for
the refrigeration plant.
Wide selection of drives
Two families of electronic variable-speed drives are available,
current-source (LCI) and voltage-source (PWM), with
each type offering specific advantages. The optimum
drive system will be selected in close cooperation with the
client’s experts based on circumstances and criteria.
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