High-speed electrical machines at multi-MW power level are being designed to drive high-speed compressor trains in oil and gas industry applications and for directly driving generators with gas turbines for shipboard and mobile power generation applications. The paper describes a converter topology to address such high power high frequency drive requirements. The proposed topology uses a three-phase bridge with series-connected single-phase bridges in each phase to obtain a four-level configuration. Optimized low pulse-count synchronous switching is used to limit the switching frequency of the individual devices; yet obtain the required power quality under all operating condition of the machine without use of external harmonic filters. Method of switching optimization and predicted performance of the drive are presented. Experimental results from a lab-scale prototype are provided to validate the concept.
This paper presents a new software package for simulation of motor drive systems -EESimulator3.0. Its algorithm, which integrates circuit-oriented with function-oriented simulation, possesses the advantage of both and makes it possible to simulate large power electronic drive systems efficiently and precisely. Its interface is designed and realized like popular software "Visio". Input and output are both implemented easily and visually in graphic interface. A three-level inverter drive system has been studied using this software, and the simulation results have verified its validity.
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