DocumentCode :
1490885
Title :
Modeling and Control Design for a Very Low-Frequency High-Voltage Test System
Author :
Cao, Zhiyu ; Hu, Manli ; Frohleke, Norbert ; Bocker, Joachim
Author_Institution :
Dept. of Power Electron. & Electr. Drives, Univ. of Paderborn, Paderborn, Germany
Volume :
25
Issue :
4
fYear :
2010
fDate :
4/1/2010 12:00:00 AM
Firstpage :
1068
Lastpage :
1077
Abstract :
With the rapid growth of energy generation by regenerative decentralized sources and the continuous replacement of overhead power lines by subterraneous distribution grids, the amount of power supply cables is increasing. In consequence, a large demand for mobile high-voltage cable test systems is expected within the coming years. This contribution deals with modeling and control design of a novel high-voltage test system based on a zero-voltage switching series-parallel resonant converter and a three-stage Cockcroft-Walton voltage multiplier rectifier, generating a true sinus test voltage of 85 kV (rms) at 0.1 Hz. Due to the inherent high dynamics of the power supply as compared to the slowly varying output test voltage, a cascaded control scheme relying on a fast inner current control loop combined with an outer voltage control is established. In order to derive the relevant waveforms, the complex rectifier was significantly simplified to a one-stage voltage doubler rectifier. By applying a suitable generalized averaging method in combination with an extended describing function, a steady-state solution along with the corresponding small signal model can be established, which is utilized for the current control design. The cascaded control strategy using an observer enables substitution of voluminous and costly high-voltage current sensors. The total high-voltage test system was implemented and validated by experimental tests.
Keywords :
control system synthesis; electric current control; high-voltage engineering; power cable testing; rectifying circuits; resonant power convertors; voltage control; zero voltage switching; cascaded control scheme; control design; current control loop; energy generation; frequency 0.1 Hz; generalized averaging method; high-voltage current sensors; mobile high-voltage cable test systems; observer; one-stage voltage doubler rectifier; overhead power lines; power supply cables; regenerative decentralized sources; steady-state solution; subterraneous distribution grids; three-stage Cockcroft-Walton voltage multiplier rectifier; very low-frequency high-voltage test system; voltage 85 kV; voltage control; zero-voltage switching series-parallel resonant converter; Cascade control; modeling; resonant power conversion; voltage multipliers;
fLanguage :
English
Journal_Title :
Power Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8993
Type :
jour
DOI :
10.1109/TPEL.2009.2033600
Filename :
5276838
Link To Document :
بازگشت