Abstract
A high-voltage direct-current (HVDC) transmission system with a current-source thyristor inverter for wind farms has been proposed. In the system, synchronous generators are used such as a permanent magnet synchronous generator (PMSG) or a wound rotor synchronous generator (WRSG). In this paper, a simulation model of self-excited synchronous generator for wind turbine generators is derived, and based on the model steady-state characteristics of the wind turbine generator system containing the generator are discussed. The model is introduced based on the dq transformation for salient-pole type machines. The instantaneous voltage and current waveforms of the generator are simulated with this model. Then, the simulation is executed for the case that the generator output terminal is connected to the HVDC transmission system through a thyristor rectifier. The effects of short-circuit ratio of the generator on the system characteristics are also studied. Finally, experimental investigations are carried out to confirm the validity of the simulation model. It is shown that the proposed simulation model is useful for developing wind farms with self-excited synchronous generators.
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