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Parallel Operation of Voltage Source Inverters by Using Stator Windings of High Power Three-Phase Induction Motors  

김인동 (부경대학교)
노의철 (부경대학)
전성즙 (부경대학교)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.8, no.4, 2004 , pp. 815-820 More about this Journal
Abstract
The parallel operation of voltage source inverters using stator windings of high power three-phase induction motors was proposed in this paper. Most current high power induction motors with more than 4 electric poles have their external terminals installed so that windings of each phase can be approached from the outside. High power induction motors can be driven by parallel-operating several voltage source inverters through these external terminals. This way, in case a certain inverter breaks down, the operation torque will get decreased but the system can maintain its operation with the other inverters, so it can cope more effectively with breakdowns. Moreover, by providing phase difference to the switching movements of each inverter, it can increase equivalent switching frequency, which helps achieve good characteristics such as the reduction in the ripple of output torque, the reduction in the ripple of input current, and the reduction in the size of DC capacitors. Besides, since power is divided into each inverter, it can also decrease the ifluence of EMI occurring in the system. The characteristics of the proposed method were proved through computer simulations in this paper.
Keywords
Parallel inverter; Parallel operation; Induction motor; Voltage source inverter;
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