Abstract

This note has proposed a novel concept, called dynamic COI-tracking concept, in which the power angle and frequency of each generator track the dynamic COI (center of inertia) of the power system. A salient feature of the suggested concept is that it pulls all generators towards the real-time COI of the system, in the end it drives the system to a stable state with an acceptable frequency. Besides, it is built on a control structure which is decoupled. To make a comparison between the proposed concept and the conventional one, we will first establish the control system models based on the two concepts respectively. Then, using the back-stepping method, two robust controllers will be designed to achieve the control objectives of the two concepts. At last, dynamic simulations will be carried out based on a 2-area-4-machine test power system, and the control effects of the two robust controllers, together with that of the conventional AVR+PSS excitation system, will be compared to show the advantages of the proposed concept in improving transient angle stability. (6 pages)

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