Abstract
This paper describes the enhancement of power system stability by using a 2-axis generator with vector type (2-axis) excitation system. The 2-axis excitation generator (machine) is different from the conventional one-axis excitation generator, as it consists of two mutually orthogonal field windings. To make best use of the features offered by this type of generator, two types of control systems, namely Fully Vector Control (FVC) and Partial Vector Control (PVC) schemes are developed and tested for their performance. Each control scheme can independently control the excitation of the 2-axis excitation generator and thereby allows each system to have an additional option of controlling the real power apart from the reactive power. The effectiveness of these control schemes on the 2-axis machine is assessed in terms of operation stability enhancement of the 2-axis excitation generator in comparison to the conventional generator through digital simulations.
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