Analysis of High-Frequency Voltage Oscillation of Air-Core Pulsed Alternator in Electric-Excitation Mode

Air-core pulsed alternator (APA) is an ideal carrier for a high-power pulsed power supply because of the advantages of high-energy storage density and the discharge current crosses zero naturally. The upper limit of the magnetic field intensity and the adjustability of the electric excitation are hi...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2023-11, Vol.51 (11), p.3317-3324
Main Authors: Li, Wenchao, Fu, Rongyao, Zhang, Ying, Yan, Ping, Wang, Youlong, Sun, Yaohong
Format: Article
Language:English
Subjects:
Air-core pulsed alternator (APA)
Alternators
Capacitance
Capacitors
Discharge
Discharges (electric)
electric excitation
Electric potential
Energy storage
Equivalent circuits
Field coils
high-frequency voltage oscillation
Inductance
Integrated circuit modeling
Magnetic fields
Magnetic flux
Oscillators
Parameters
RC series circuit
Self excitation
stray parameter
Topology
Voltage
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Description
Summary:Air-core pulsed alternator (APA) is an ideal carrier for a high-power pulsed power supply because of the advantages of high-energy storage density and the discharge current crosses zero naturally. The upper limit of the magnetic field intensity and the adjustability of the electric excitation are higher and better than that of the permanent magnetic excitation, which bring the APA capable of discharging more flexibly. However, there is a problem for the engineering application of the APA of electric excitation. When the voltage is changing abruptly, there is a high-frequency voltage oscillation (HFVO) at both ends of the field coil. This problem is studied in this article, taking the separate excitation(a form of the electric excitation) as an example. First, the moment and reason of the HFVO are determined. Second, the equivalent circuit of the moment of the HFVO is modeled, and the analytical expression of the equivalent circuit and the stray capacitance value are derived. Third, the solution is proposed theoretically; that is, the resistance-capacitance (RC) series circuit is connected in parallel with the field coil or other equivalent positions. And, the derivation process of the parameters of the RC series circuit is given. The simulation and experimental results show that the parameters are appropriate. Finally, on the basis of the above, the extended research on self-excitation (another form of the electric excitation) is carried out.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2023.3325530