Title :
Behavior Analysis of the Nonuniform Damping and Screening System in the HTS Generator
Author :
Wenfeng Zhang ; Dong Xia ; Dong Zhang
Author_Institution :
Inst. of Electr. Eng., Beijing, China
Abstract :
The damping and screening system (DSS) is a key structure of the hybrid high-temperature superconducting generator. In this paper, an analytical method was introduced to analyze the performance of the DSS with different time constants on both the d-axis and the q-axis of the generator. First, the distribution of the eddy currents in the DSS was analyzed, and the calculation of the equivalent resistance, inductance, and time constant of the DSS was considered. Then, to analyze the performance of the nonuniform DSS (NDSS), a splitting method was introduced. Using the new method, parameters of the damping part, screening part, and supplementing part of the NDSS were calculated, respectively. At last, the screening and damping performances of the NDSS were evaluated. The finite-element method was also employed to verify the analytical results. An experimental platform was built up to test the screening ratio and verify the simulating results.
Keywords :
current distribution; damping; eddy currents; electric generators; finite element analysis; high-temperature superconductors; superconducting machines; HTS generator; NDSS; damping and screening system; eddy current distribution; equivalent resistance; finite element method; hybrid high-temperature superconducting generator; nonuniform DSS; screening ratio; splitting method; Damping; Decision support systems; Eddy currents; Generators; High-temperature superconductors; Magnetic fields; Windings; Damping; HTS generator; damping; eddy current; high-temperature superconducting (HTS) generator; non-uniform; nonuniform; screening;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2015.2441780