Redundancy system for continuous driving large motor drive equipment

A compressor which is used in liquefied natural gas (LNG) plant is mainly driven by turbine engine, but consideration for electrically driven compressor by a motor is increasing. Particularly, application of a motor driven by an inverter has the advantage of adjustable speed control of compressor. However, there is a concern of compressor train stop due to inverter failure. To eliminate this concern, various redundancy system for continuous driving large capacity inverter TM drive™-XL series are developed. The redundancies including the main inverter circuits realize inverter continuous operation even if a failure is occurred to some parts.