Type of Document Thesis Author Infante, Diomar Author's Email Address email@example.com URN etd-04102011-212407 Title Guiding the Selection of Physical Experiments for the Validation of a Model Designed to Study Grounding in Dc Distribution Systems Degree Master of Science Department Electrical and Computer Engineering, Department of Advisory Committee
Advisor Name Title Chris S. Edrington Committee Chair Tom Baldwin Committee Co-Chair Michael "Mischa" Steurer Committee Member Simon Y. Foo Committee Member Keywords
- Physical Experiments
- Dc Distribution
- Power System Grounding
- Quantitative Validation
Date of Defense 2011-03-21 Availability unrestricted AbstractThe following work establishes a process for model validation and its application to the study of grounding in DC shipboard power systems. The aim of the thesis is to create a general procedure detailing how to appropriately select physical experiments that validate the simulation model under use. The procedure presented can be applied to any physical system. In the work presented here, the procedure is implemented on a physical setup representational of a shipboard power system. This set up is used for the study of grounding. Grounding in the context used in this work refers to the intentional physical connection from the power carrying elements in the electrical system to the ship hull. Grounding practices are generally well understood for AC shipboard power system. However, the same cannot be said for MVDC systems. There is a growing interest in medium voltage DC systems to be implemented on shipboard power systems. This new type of distribution systems posse many unanswered questions. One of those questions is in regards to the selection of the grounding scheme.
The selection of the grounding scheme for a MVDC system is a question of optimization once the designer has a good understanding of the key parameters found in the system. The key parameters in the systems are those that have a large impact on the systemís responses. This work provides the designer with a tool to assess the impact each of those parameters has on the responses of the system. These system responses can be labeled as metrics and are encapsulated under the two main objectives of shipboard power systems grounding: safety and continuity of service. Thus, the aim of this work, to establish a procedure, which regardless of the shipboard power system under study, can deliver a validated simulation model for the designer to optimize.
The proposed procedure was applied to a representative physical set up of a shipboard power system. The physical model contains most of the requirements to understand to issues associated with DC shipboard grounding. Certain aspects of DC shipboard power systems have not been implemented in the physical model due to material constraints. However, the physical system still holds enough value to gain insight into what happens in a DC shipboard power system. In addition, the physical model has enough complexity to use as a test case for the application of the procedure proposed. The work presented herein focuses on the selection of physical experiments in order to validate the simulation model in a qualitative fashion. The process is presented and its major components are discussed. It is important to note that the design process yields, as a byproduct, insight into the system under study. In the case presented here, in which the process is used with a focus in system grounding, a good explanation of rail to ground harmonics is obtained.
In summary, the contributions of this work are twofold. The thesis provides a layout for obtaining confidence in the models being used for the system under study. In addition, this work establishes the important parameters in regards to grounding in DC shipboard power system based on the simplified model used.
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