Title page for ETD etd-05182011-140927


Type of Document Master's Thesis
Author Martin, Daniel
Author's Email Address marti780@vt.edu
URN etd-05182011-140927
Title Analysis and Design of Phase Lock Loop Based Islanding Detection Methods
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Lai, Jih-Sheng Jason Committee Chair
Meehan, Kathleen Committee Member
Yu, Wensong Committee Member
Keywords
  • Anti-islanding
  • distributed power generation
  • anti-islanding
  • smart grid
Date of Defense 2011-05-04
Availability unrestricted
Abstract
As distributed generation penetrates the electric power grid at higher power levels, grid interface issues with distributed generation must be addressed. The current power system consists of central power generators, while the future power system will include many more distributed resources. The centralized power generation system is controlled by utility operators, but many distributed resources will not be controlled by utility operators. Distributed generation must use smart control techniques for high reliability and ideal grid interface.

This thesis discusses the grid interface issue of anti-islanding. An electric island occurs when a circuit breaker in the electric power system trips. The distributed resource should disconnect from the electric grid for safety reasons. This thesis will give an overview of the possible methods. Each method will be analyzed using the ability to detect under the non-detection zone and the economic feasibility of the method.

This thesis proposes two addition cases for analysis that exist in the electric power system: the effect of multiple methods in parallel in the non-detection zone and the possibility of a false trip caused by a load step. Multiple methods in parallel are possible because the islanding detection method is patentable, so each grid interface inverter company is likely to implement a different islanding detection method. The load step represents a load change when a load is switched on.

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