Title :
Investigation of fault-tolerant capability of five-phase doubly salient electromagnetic generator
Author :
Yao Zhao ; Huizhen Wang ; Lan Xiao
Author_Institution :
Jiangsu Key Lab. of New Energy Generation & Power Conversion, Nanjing Univ. of Aeronaut. & Astronaut., Nanjing, China
Abstract :
A new topology of five-phase fault-tolerant doubly salient electromagnetic generator (FTDSEG) is proposed for high reliability applications in this paper. The analysis of no-load and loading operations shows the potential fault-tolerance capability. On the basis of comparative analysis on structure characteristics between five-phase non-FTDSEG (NFTDSEG) and five-phase FTDSEG, the variation of rotor pole number from NFTDSEG to FTDSEG is revealed. Meanwhile, the flux linkage and electromotive forces (EMFs) of five-phase NFTDSEG and five-phase FTDSEG are investigated with finite element method and five faults of five-phase FTDSEG are analysed in detail. Especially when single phase short-circuit fault happens, the magnetic field of the motor, flux linkage of short-circuit phase and short-circuit currents without load are investigated in four different short-circuit moments and the fault is in consideration of armature winding resistance. The ultimate variation trend of flux linkage is irrelevant to moment when the short-circuit fault happens. The flux linkage and EMF of short-circuit phase are also analysed. The laws of fault operating influence on external and power characteristics of FTDSEG are researched in five faults with different exciting currents. The fault-tolerant ability of five-phase FTDSEG has been demonstrated by the experimental results.
Keywords :
electric generators; electric potential; fault tolerance; finite element analysis; machine windings; magnetic fields; short-circuit currents; EMF; NFTDSEG; armature winding resistance; electromotive forces; fault operating influence; fault-tolerant capability; finite element method; five-phase doubly salient electromagnetic generator; five-phase non-FTDSEG; flux linkage; magnetic field; rotor pole number; short-circuit currents; short-circuit moments; single phase short-circuit fault;
Journal_Title :
Electric Power Applications, IET
DOI :
10.1049/iet-epa.2014.0058