TL12 - Innovative Solution for Large LNG Compression Trains Using 2-Pole Induction Helper Motor Fed by Voltage Source Inverter
Abstract
This paper reviews the selected global architecture of an 85MW LNG compression train featuring a 2-pole 20MW DFE-VSI induction motor starter-helper system for a plant in the US. The first part of this paper presents the comparison between the synchronous motor powered by a load switching inverter (LCI) and the induction motor powered by a voltage source inverter (VSI) for the simplification of the electric lineup and the elimination of inter-harmonics. The simple Reliability Availability Maintainability (RAM) analysis of these two electric systems is also summarized. An innovative 10kV Neutral-Point Piloted (NPP) topology for the valves of the inverter is described. The second part of this paper focuses on the motor operating 5MW above the current power limit for 2-pole induction motors and describes the good design practices and the power limitation of the squirrel cage rotor technology. The final section is dedicated to the electrical system and the validation tests at full speed and full load. It presents the results of motor factory acceptance tests compliant to API 541, string tests, and train commissioning, thereby validating the system performance.
Description
LectureCollections
Citation
Durantay, Lionel; Clark, Ty; Paschal, John; Spolveri, Niccolò; Roth, Lionel; Vivier, Pierre-Paul ([201). TL12 - Innovative Solution for Large LNG Compression Trains Using 2-Pole Induction Helper Motor Fed by Voltage Source Inverter. Turbomachinery Laboratory, Texas A&M Engineering Experiment Station; Texas A & M University. Libraries. Available electronically from https : / /hdl .handle .net /1969 .1 /188623.