Abstract
Voltage stability of a power system is related to load characteristics and voltage control devices such as on-load tap-changing (OLTC) transformers. This paper discusses the need for enhancing the OLTC operation, and identifies five control requirements for intelligent control of the OLTC duty cycle. The paper also describes an adaptive fuzzy logic controller (AFLC) developed for satisfying these requirements. By simulations on a six-bus study system, the ALFC is shown to be an effective means of enhancing the OLTC operation. The five control requirements are fulfilled by preventing the reverse actions, suppressing voltage transients, reducing control errors, and ensuring fast response and robustness.
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