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In a previous paper, we proposed a new self-excited three-phase synchronous generator in which the 2nd-space harmonic component of the armature reaction field is used for exciting the field system, and clarified its operating principles and basic characteristics by experiment. The new generator has a series excitation characteristic, and responds quickly to a sudden change of load, because an excitation power can be directly obtained from the armature reaction field.This paper introduces a method for analyzing the steady-state performance of our new generator. In the analysis, an equivalent circuit of the generator is derived from a duality between interlinked electric and magnetic circuits. A simple determination method of parameters in the equivalent circuit is also shown. Calculated results are compared with the experimentally obtained values on a laboratory machine, and good agreement between both values has been observed. The proposed analysis is useful for simulating the steady-state performance of the generator by taking into account the nonlinear effect of the iron core due to magnetic saturation.

Analysis of the Self-Excited Three-Phase Synchronous Generator Utilizing the 2nd-Space Harmonic for Excitation.