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.

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

/pdf/high-voltage-dc-converter-systems-modeling-simulation-and-1arh08prpf.pdf

High Voltage DC Converter Systems Modeling, Simulation and Analysis

In a generator-set with inverter output, the proper matching between the output impedance of the synchronous generator-fed DC-link and the input impedance of the inverter is crucial for the system's stability. This paper shows how such matching can be achieved by using a multiple-pole, multiple-zero compensator for the DC-link voltage control-loop. Compensator design requires detailed knowledge of the system's dynamic behavior in terms of control-to-output transfer function, obtained with the generator/rectifier linearized average model. The transient behavior of the closed-loop system and the validity of modeling and control design approach are verified through experimental measurements.

Control of the synchronous generator in generator-sets with inverter output

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Control of the synchronous generator in generator-sets with inverter output