Development of Interval Type 2 Fuzzy Logic Controller to simulate automatic voltage regulator behaviour in excitation control of power system

摘要

The power system is constantly being subjected to small disturbances, which cause the generators relative angles to change Bao-Gang Hu et al, 2001. The small signal stability problem is associated with modes of oscillations affecting either a single machine (local modes ) or a small group of relatively closely connected machines or inter - area (global modes). This problem has got a very high attention in the last three decades and many types of controllers depend on classical and modem control theory have been developed by designing supplementary control signals to improve system damping Bao-Gang Hu etal, 2001. This work aims to develop a Logic controller based on Interval Type2 Fuzzy Logic Controller (IT2FLC) to simulate an automatic voltage regulator in transient stability power system analysis. It was simulated a one machine control to check if the Interval Type2 Fuzzy Logic Controller (IT2FLC) controller implementation was possible. After that the controller developed was applied to an 8 bus bar system in order to show its behavior, which results were compared to the results obtained with the AVR itself. The purpose of this work is the development of a fuzzy controller (software) to simulate the automatic voltage regulator behavior. This paper presents the performance of an application of latest development of type 1 fuzzy logic which is interval type2 fuzzy logic Controller as an excitation controller. Interval Type2 Fuzzy Logic controller (IT2FLC) is a proportional-derivative type (PD-Type) fuzzy logic controller consists of interval type2 fuzzy logic controller (IT2FLC) and adjustable proportional and derivative gain. As reference Typel Fuzzy Logic controller (T1FLC), AVR have been used to be compared to IT2FL controller.