engleski

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 design without an accurate design requires large-signal transient modeling. A particularity of the described system is strong non-ideal operation of the diode rectifier, a consequence of the large value of the generator’s synchronous impedance. This non-ideal 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 non-ideal operation of the diode rectifier. The model is non-linear, 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 bandwith is needed for this control-loop in order to achieve the proper impedance matching between the power source and active electronic load.

Active electronic load; diode rectifier; inverter output; synchronous ac generators.

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