The Third Harmonic Model for Salient Pole Synchronous Generator Under Balanced Load

The third harmonic current produced by salient pole
synchronous generator has always been associated with high neutral
current causing problem to neutral earthing resistor, telecommunication
system, and earthfault protection. In this paper, the
third harmonic model for salient pole synchronous generator in
symmetrical component domain is proposed that comprise of generator
parameter and generated voltage. The new computational
technique in determining the third harmonic zero-sequence synchronous
impedance is introduced. In completing the model, the
method to characterize generated third harmonic zero-sequence
voltage under balanced combine resistive and inductive load is
described. In order to study the third harmonic current flowing
in the network, the propagation model is also established. The
third harmonic synchronous generator parameters are measured
and comparatively validated with laboratory experiment results.
In addition to that, the third harmonic generated voltage is characterized
and validated experimentally.