Voltage Regulation Management Of Hybrid Distribution System

Mishabelle Dessy, Alex (2023) Voltage Regulation Management Of Hybrid Distribution System. [Final Year Project Report] (Unpublished)

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Abstract

The increasing potential of renewable energy integration into the existing distribution system, particularly with solar photovoltaic (PV) energy has raised much concern especially in regard to the voltage at the end-user. Variation of voltage caused by changing solar radiation could lead to varying voltage output where frequent tap changes occur in the voltage regulators such as on-load tap changer transformer. There is a need for a more efficient method of voltage regulation since the mechanical switches of existing on-load tap changers are now a liability due to the frequent tap changes. The main objective of this work is to design a Simulink model for a solid-state onload tap changer autotransformer using MATLAB environment. In the soft switching approach, thyristors act as the main switching component for the tap changer, replacing the mechanical switches to switch taps of the autotransformer windings in response to voltage variation. This method involves validation using small-sized hardware such as Arduino UNO microcontroller where the proposed design will be evaluated by comparing regulated output voltage with the standard system voltage as well as monitoring the tap change operation during different conditions such as normal and abnormal condition. The resulting design of the solid-state on-load tap changer is found to be more efficient in comparison to a mechanical on-load tap changer in terms of tap change and selection speed as well as arcing elimination. The OLTC was able to detect voltage changes within each tap range and in response select the proper tap from nominal tap, optimising the voltage output to 1.0 pu ±0.024pu variation. The solid-state tap changer reduces time of tap selection by 83% in comparison to mechanical tap changers with 1.0s switching duration.

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