Document Type

Thesis - University Access Only

Award Date

2006

Degree Name

Master of Science (MS)

Department / School

Electrical Engineering and Computer Science

Abstract

Islanding of distributed generation systems can occur when a utility interactive distributed generation system, such as a photovoltaic system, lack the ability to acknowledge the absence of the utility, which can lead to safety hazards to working personnel due to live lines and damage of equipment due to asynchronous reclosure. It is possible that the likelihood of formation of an island could be more problematic in the multi-inverter case. Several technique ha\e been investigated to prevent islanding and the effectiveness of some previously developed method in the multi-inverter case is being explored. The Teslaco method, based on classical control theory, was developed in 1984. This study was designed to explore the effectiveness of the Teslaco method in multi-inverter application . A computer model of the Teslaco method was built in MATLAB/Simulink and simulations were conducted to examine the performance of the model in the ingle inverter and multi-inverter case . Verification of model performance was done by comparing the single-inverter results obtained from previous studies. The Teslaco method was compared to a recently developed method, Sandia Frequency Shift (SFS), to examine its effectiveness. The following findings were made:

1 . The Teslaco behavior as a function of the quality factor of the local load is the opposite of that of most common methods;
2. Contrary to expectations, the Teslaco method does not lose effectiveness in the multi inverter case; in fact, it slightly improves.

Library of Congress Subject Headings

Distributed generation of electric power -- Safety measures

Photovoltaic power systems

Interconnected electric utility systems

Format

application/pdf

Number of Pages

101

Publisher

South Dakota State University

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