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The excitation magnetomotive force of the generator rotor can be decomposed into a fundamental wave with a frequency of 50Hz and a series of higher harmonics, in which the third harmonic power can be taken out and excited by a dry generator.
When the generator is loaded with inductive load, the armature reaction magnetomotive force also produces the third harmonic, which is exactly the same phase as the third harmonic generated by the excitation magnetomotive force, and plays a role in assisting the magnetic compound excitation of the generator. The fundamental wave of the armature reaction magnetomotive force demagnetizes the fundamental wave of the excitation magnetomotive force, and the generator terminal voltage decreases, while the third harmonic of the armature reaction magnetomotive force plays a role in assisting the third harmonic of the excitation magnetomotive force. If the third harmonic is used for excitation, it will increase the electromotive force induced in the harmonic winding, increase the excitation current and increase the generator terminal voltage.
Therefore, the third harmonic excitation can keep the generator terminal voltage constant when the generator is loaded. When the load is suddenly loaded and unloaded, the generator has good dynamic performance. The third harmonic excitation generator has strong starting ability. Asynchronous motor capability.