Modeling and control of a synchronous generator with an active DC load

The design and analysis of a system consisting of a variable-speed synchronous generator that supplies an active DC load (inverter) through a three-phase diode rectifier requires adequate modeling in both time- and frequency-domains. As an example, the system's control-loops are difficult to de...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 15; no. 2; pp. 303 - 311
Main Authors Jadric, I., Borojevic, D., Jadric, M.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.03.2000
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Active control
Control system synthesis
Design engineering
Diode rectifiers
Diodes
Dynamical systems
Electrical engineering
Electronics
Frequency
Generators
Impedance
Inverters
Mathematical models
Power system modeling
Protection
Rectifiers
Steady-state
Synchronous
Synchronous generators
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Summary:The design and analysis of a system consisting of a variable-speed synchronous generator that supplies an active DC load (inverter) through a three-phase diode rectifier requires adequate modeling in both time- and frequency-domains. As an example, the system's control-loops are difficult to design without an accurate small-signal model; at the same time, the system protection design requires large-signal transient modeling. A particularity of the described system is strong nonideal operation of the diode rectifier, a consequence of the large value of the generator's synchronous impedance. This nonideal behavior influences both steady-state and transient performance. This paper presents an average model of the system that accounts, in a detailed manner for the dynamics of the power source and the load, and for the effects of the nonideal operation of the diode rectifier. The model is nonlinear, but time-continuous, and can be used for large- and small-signal analysis. The developed model was verified on a 105 kW generator-set with inverter output, whose DC-link voltage control-loop design was successfully carried out based on the average model. It is shown that a high bandwidth is needed for this control-loop in order to achieve the proper impedance matching between the power source and the active electronic load.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0885-8993
1941-0107
DOI:10.1109/63.838103