Stabilizing low-frequency oscillation with two-stage filter in Hall thrusters

The use of a filter is the most common method to suppress low-frequency discharge current oscillation in Hall thrusters. The only form of filter in actual use involves RLC networks, which serve the purpose of reducing the level of conducted electromagnetic interference returning to the power process...

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Veröffentlicht in:Review of scientific instruments 2017-07, Vol.88 (7), p.073502-073502
Hauptverfasser: Wei, Liqiu, Han, Liang, Ding, Yongjie, Yu, Daren, Zhang, Chaohai
Format: Artikel
Sprache:eng
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Zusammenfassung:The use of a filter is the most common method to suppress low-frequency discharge current oscillation in Hall thrusters. The only form of filter in actual use involves RLC networks, which serve the purpose of reducing the level of conducted electromagnetic interference returning to the power processing unit, which is the function of a filter. Recently, the role of the filter in the oscillation control was introduced. It has been noted that the filter regulates the voltage across itself according to the variation of discharge current so as to decrease its fluctuation in the discharge circuit, which is the function of a controller. Therefore, a kind of two-stage filter is proposed to fulfill these two purposes, filtering and controlling, and the detailed design methods are discussed and verified. A current oscillation attenuation ratio of 10 was achieved by different capacitance and inductance combinations of the filter stage, and the standard deviation of low-frequency oscillations decreased from 3 A–1 A by the control stage in our experiment.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4990045